Precision Cooling

For Business-Critical Continuity

Liebert CW
User Manual26-400 kW, Upflow and Downflow, 50/60Hz
 TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
SAVE THESE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.0 LIEBERT CW NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.0 PRE-INSTALLATION GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.1 Room Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Installing Liebert CW300 and Liebert CW400 Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Air DistributionDownflow Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.5 Air DistributionUpflow Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.6 Connections and System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7 Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7.1 Cooling, Humidification and Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7.2 Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.0 LIEBERT CW DIMENSIONS AND WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3.1 DimensionsDownflow Models with EC Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 DimensionsUpflow Models with EC Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3 DimensionsDownflow Models With Centrifugal Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.4 DimensionsUpflow Models With Centrifugal Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5 Floor Stand Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.6 Plenum Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.0 EQUIPMENT INSPECTION AND HANDLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.1 Packaging MaterialAll Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.2 Unpacking the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.2.1 Removing the Unit from the Skid With a Forklift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.2.2 Moving the Unit to the Installation Location with Piano Jacks . . . . . . . . . . . . . . . . . . . . . . . 39
4.2.3 Removing Piano Jacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.2.4 Removing Liebert CW from Skid Using Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.0 EC FANS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.1 Lowering and Removing EC FansDownflow Units Only . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.1.1 Lowering the EC Fans into the Floor Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.1.2 EC Fan Block-Off Panel KitOptional. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.1.3 Removing EC FansDownflow Units Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.2 Installing Upflow EC Fan Plenums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.2.1 Liebert CW Upflow Plenum Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.2.2 Upflow Plenum and EC Fan Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.0 ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.1 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

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7.0 PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
7.1 Fluid Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
7.1.1 Condensate PipingField-Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
7.1.2 Humidifier Supply WaterOptional Infrared . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
7.1.3 Humidifier Supply WaterOptional Steam Generating Humidifier . . . . . . . . . . . . . . . . . . . 83
7.2 Chilled Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
7.2.1 Requirements of Systems Using Water or Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
8.0 PIPING SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
9.0 CHECKLIST FOR COMPLETED INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
9.1 Moving and Placing Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
9.2 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
9.3 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
9.4 Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
10.0 INITIAL STARTUP CHECKS AND COMMISSIONING PROCEDURE FOR WARRANTY
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
10.1 Information for Warranty InspectionRemove Power From Unit Disconnect . . . . . . . . . 100
10.2 Startup Checks With Panels Removed and Main Disconnect Off . . . . . . . . . . . . . . . . . . . . 100
10.2.1 Inspect and Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
10.3 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
10.4 Additional Considerations for Upflow Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
11.0 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
12.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
12.1 System Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
12.1.1 Environmental Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
12.1.2 Electric Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
12.2 Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
12.3 Blower PackageCentrifugal Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
12.3.1 Fan Impellers and Bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
12.3.2 BeltsExcept with EC Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
12.3.3 Electronic Variable Speed Drive (Inverter). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
12.4 Blower PackageEC Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
12.4.1 Fan Impellers and Bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
12.4.2 Protective Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
12.5 Humidifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
12.5.1 Infrared Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
12.5.2 Cleaning Humidifier Pan and Float Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
12.5.3 Changing Humidifier Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
12.6 Steam Generating Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
12.7 Condensate Drain and Condensate Pump Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
12.7.1 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
12.7.2 Condensate Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
12.8 Facility Fluid and Piping Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

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12.9 HVAC Maintenance Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
APPENDIX A - INSTALLING LIEBERT CW300 AND LIEBERT CW400 . . . . . . . . . . . . . . . . . . . . . . 119
COMPLIANCE WITH EUROPEAN UNION DIRECTIVES . . . . . . . . . . . . . . . . . . . . . . INSIDE BACK COVER

FIGURES
Figure 1 Downflow unit ducting and plenum ducting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2 Upflow ducting configurations with centrifugal fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3 Plenum ducting arrangementUpflow models with EC fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4 Cabinet and floor planning dimensions, downflow models CW026 - CW084 with EC fans . . . . . . 9
Figure 5 Cabinet and floor planning dimensions, CW026, CW038 and CW041, downflow with EC
fans, front discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6 Cabinet and floor planning dimensions, CW051, CW060, CW076 and CW084, downflow
with EC fans, front discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7 Cabinet and floor planning dimensions, downflow models CW106 and CW114 with EC
fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 8 Cabinet and floor planning dimensions for downflow models CW089, CW106 and CW114
with EC fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 9 Cabinet and floor planning dimensions, CW146 - CW181, downflow with EC fans, front
discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 10 Cabinet and floor planning dimensions for downflow models CW146 and CW181 with
EC fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 11 Dimensions and floor planning data downflow models CW300, CW400 with EC fans and
filter plenums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 12 Cabinet and floor planning dimensions, upflow models CW026-CW084 with EC fans, front
air return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 13 Cabinet and floor planning dimensions, upflow models CW026 - CW084 with EC fans,
bottom air return. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 14 Cabinet and floor planning dimensions, upflow models CW106, CW114 with EC fans, front
return. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 15 Cabinet and floor planning dimensions, upflow models CW106, CW114 with EC fans, rear
return. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 16 Cabinet and floor planning dimensions, downflow models CW106 and CW114 with
centrifugal fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 17 Cabinet and floor planning dimensions, upflow models CW026-CW084 with centrifugal
fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 18 Cabinet and floor planning dimensions upflow models, CW106 and CW114 with
centrifugal fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 19 Floor stand and floor planning dimensions, downflow models CW026 - CW041 with EC
fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 20 Floor stand and floor planning dimensions, downflow models CW076 and CW084 with
EC fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 21 Floor stand and floor planning dimensions, downflow models CW089, CW106 and
CW114 with EC fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 22 Floor stand and floor planning dimensions, downflow models CW146 and CW181 with
EC fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 23 Floor stand and floor planning dimensionsDownflow CW300 AND CW400 with EC
fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 24 Floor stand dimensions, optional steam, hot water reheat and humidifier piping entrances
for downflow models CW026 - CW84 with centrifugal fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 25 Floor stand dimensions for downflow models CW106 and CW114 with centrifugal fans . . . . . . 30
Figure 26 Plenum dimension, CW026 - CW084 upflow plenums with EC fans. . . . . . . . . . . . . . . . . . . . . . . 31

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Figure 27 Plenum dimensions for upflow models CW026 - CW084 with centrifugal fans . . . . . . . . . . . . . . 32
Figure 28 Plenum dimensions for upflow models CW106 and CW114 with centrifugal fans . . . . . . . . . . . . 33
Figure 29 Plenum dimensions CW106, CW114 upflow plenums with EC fans . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 30 Filter plenum dimensions, downflow models CW146 and CW181 with EC fans . . . . . . . . . . . . . 35
Figure 31 Equipment recommended for handling the Liebert CW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 32 Removing packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 33 Remove the unit from the skid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 34 Moving the unit to its installation location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 35 Locate center of gravity marker and place slings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 36 Using rigging to lift Liebert CW off skidModels CW026-CW181 . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 37 EC fan lowering procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 38 EC fan block-off panel kit- add data from DPN002037 need to add operation in up position . . . 44
Figure 39 EC fan lowering and removal procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 40 Non-grilled plenum122" (3099mm) unit length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 41 Grilled plenum, front discharge122" (3099mm) unit length. . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 42 Grilled plenum, rear discharge122" (3099mm) unit length . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 43 Non-grilled plenum99" (2515mm) unit length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 44 Grilled plenum, front discharge99" (2515mm) unit length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 45 Grilled plenum, rear discharge99" (2515mm) unit length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 46 Non-grilled plenum50", 74" (1270mm, 1880mm) unit length . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 47 Grilled plenum, front discharge50", 74" (1270mm, 1880mm) unit length . . . . . . . . . . . . . . . . . 52
Figure 48 Grilled plenum, rear discharge50", 74" (1270mm, 1880mm) unit length . . . . . . . . . . . . . . . . . 53
Figure 49 EC fan assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 50 Recommended tools for installing the upflow plenum and EC fan . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 51 Non-grilled plenum / Grilled plenum-front discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 52 Grilled plenum-rear discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 53 Plenum placement on top of Liebert CW unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 54 EC fan assembly alignment for placement on top of Liebert CW unit . . . . . . . . . . . . . . . . . . . . . 57
Figure 55 EC fan assembly placement and attachment on top of Liebert CW unit. . . . . . . . . . . . . . . . . . . . 58
Figure 56 EC fan wire routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Figure 57 Junction box connection (fan 1 and 2 for units with 2 or 3 fans) . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Figure 58 Junction box connection (Fan 3 for units with three fans / Fan 1 for single-fan units) . . . . . . . . 61
Figure 59 Front frame members for non-grilled and grilled rear-discharge plenum. . . . . . . . . . . . . . . . . . . 62
Figure 60 Grilled front-discharge plenum grille attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 61 Non-grilled and grilled rear-discharge plenum front panel attachment . . . . . . . . . . . . . . . . . . . . 63
Figure 62 Grilled plenum front / rear-discharge top panel attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 63 Electrical field connections for downflow models CW026 - CW084 . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 64 Electrical field connections (Ethernet) for downflow models CW026 - CW084 . . . . . . . . . . . . . . . 67
Figure 65 Electrical field connections for downflow models CW089, CW106 and CW114 . . . . . . . . . . . . . . 68
Figure 66 Electrical field connections (Ethernet) for downflow models CW089, CW106 and CW114 . . . . . 69
Figure 67 Electrical field connections (high voltage) for upflow models CW026 - CW084 . . . . . . . . . . . . . . 70
Figure 68 Electrical field connections (low voltage) for upflow models CW026 - CW084 . . . . . . . . . . . . . . . 71
Figure 69 Electrical field connections (Ethernet) for upflow models CW026 - CW084 . . . . . . . . . . . . . . . . . 72
Figure 70 Electrical field connections (Ethernet) for upflow models CW106 and CW114. . . . . . . . . . . . . . . 73
Figure 71 Electrical field connections (low voltage) for upflow models CW106 and CW114 . . . . . . . . . . . . . 74
Figure 72 Electrical field connections (low voltage Ethernet) upflow models CW106 and CW114 . . . . . . . 75
Figure 73 Electrical field connections for downflow models CW146 and CW181 with EC fans . . . . . . . . . . 76
Figure 74 Gravity drain for downflow and upflow units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Figure 75 Downflow general arrangement, CW026-CW114 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 76 Downflow general arrangement, CW181-CW146 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

iv
Figure 77 Primary connection locations, downflow models CW026 - CW041 with EC fans . . . . . . . . . . . . . 88
Figure 78 Primary connection locations, downflow models CW051 and CW060 with EC fans. . . . . . . . . . . 89
Figure 79 Primary connection locations, downflow models CW076 - CW084 with EC fans . . . . . . . . . . . . . 90
Figure 80 Primary connection locations, downflow models CW089, CW106 and CW114 with EC fans . . . 91
Figure 81 Primary connection locations, downflow models CW146 and CW181 with EC fans. . . . . . . . . . . 92
Figure 82 Primary connection locations, downflow units, model CW300 and CW400 with EC fans . . . . . . 93
Figure 83 Piping connections, downflow models CW026 - CW084 with centrifugal fans . . . . . . . . . . . . . . . 94
Figure 84 Piping connections for downflow models CW106 and CW114 with centrifugal fans . . . . . . . . . . 95
Figure 85 Upflow general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Figure 86 Piping connections for upflow models CW026 - CW084 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Figure 87 Piping connections for upflow models CW106 and CW114 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Figure 88 Correct orientation of float switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Figure 89 Infrared humidifier lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Figure 90 Steam generating humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Figure 91 Run/drain switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Figure 92 Steam generating humidifier control board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Figure 93 Rear floor stand and rear unit mounted on floor stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Figure 94 Rear floor stand jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Figure 95 Floor stand bolt locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Figure 96 Module bolt locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Figure 97 Fan deck bolt locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Figure 98 Wire harness routing point. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Figure 99 Wire harness junction box detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

TABLES
Table 1 Shipping dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 2 Shipping weights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3 Liebert CW upflow plenum with EC fan assembly(s) configurations . . . . . . . . . . . . . . . . . . . . . . 47
Table 4 Key to Liebert CW Upflow plenum assembly parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 5 Liebert CW Upflow EC fan assembly weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 6 Maximum harmonic current distortion, IEEE-519-1992 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Table 7 Typical TDD for CW106, CW114 and CW146 at 460V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Table 8 Typical TDD for CW181 at 460V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 9 Blower troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Table 10 Chilled water troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Table 11 Humidifiersteam generator troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Table 12 Humidifierinfrared troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Table 13 Reheat troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Table 14 Humidifier canister part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Table 15 Faultscanister generator humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Table 16 Steam generating humidifier capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Table 17 DIP switch settings for steam generating humidifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Table 18 Liebert CW300 and Liebert CW400 component parts and weights . . . . . . . . . . . . . . . . . . . . . . . 119
Table 19 Table 2 - Liebert CW300 and Liebert CW400 Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 120

v
vi
IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

This manual contains important safety instructions that should be followed during the installation
and maintenance of the Liebert CW. Read this manual thoroughly before attempting to install or
operate this unit.
Only properly trained and qualified personnel should move, install or service this equipment.
Adhere to all warnings, cautions and installation, operating and safety instructions on the unit and in
this manual. Follow all operating and user instructions.

! WARNING
Arc flash and electric shock hazard. Disconnect all electric power supplies and wear protective
equipment per NFPA 70E before working within electric control enclosure. Failure to comply
can cause serious injury or death.
Customer must provide earth ground to unit, per NEC, CEC and local codes, as applicable.
Before proceeding with installation, read all instructions, verify that all the parts are included
and check the nameplate to be sure the voltage matches available utility power.
The Liebert iCOM microprocessor does not isolate power from the unit, even in the Unit Off
mode. Some internal components require and receive power even during the Unit Off mode of
Liebert iCOM control.
The line side of the disconnect switch on the front of the unit contains live high-voltage.
The only way to ensure that there is NO voltage inside the unit is to install and open a remote
disconnect switch. Refer to unit electrical schematic.
Follow all local codes.

! WARNING
Risk of high-speed moving parts. Can cause injury or death.
Disconnect all local and remote electric power supplies before working in the unit.
Do not operate this unit with any or all cabinet panels removed.
Do not operate upflow units without installing a plenum, ductwork or guard over the blower
opening(s) on the top surface of the unit cabinet.
Ductwork must be connected to the blower(s), or a plenum must be installed on the blower
deck for protection from rotating blower wheel(s) on upflow units.

! WARNING
Risk of top-heavy unit falling over. Can cause equipment damage, injury or death.
Read all of the following instructions before attempting to move the unit, lift it, remove
packaging or prepare the unit for installation.

! CAUTION
Risk of contact with hot surfaces. Can cause injury.
The humidifiers and reheats are extremely hot during unit operation. Allow sufficient time for
them to cool before working within the unit cabinet. Use extreme caution and wear protective
gloves and arm protection when working on or near hot discharge lines, humidifiers and
reheats.

! CAUTION
Risk of sharp edges, splinters and exposed fasteners. Can cause injury.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should attempt to move the unit, lift it, remove packaging or prepare the
unit for installation.

1 Liebert CW
 NOTICE
Risk of clogged or leaking drain lines. Can cause equipment and building damage.
This unit requires a water drain connection. Drain lines must be inspected regularly and
maintenance must be performed to ensure that drain water runs freely through the drain
system and that lines are clear and free of obstructions and in good condition with no visible
sign of damage or leaks. This unit may also require an external water supply to operate.
Improper installation, application and service practices can result in water leakage from the
unit. Water leakage can result in severe property damage and loss of critical data center
equipment.
Do not locate unit directly above any equipment that could sustain water damage.
Emerson recommends installing leak detection equipment for unit and supply lines.

NOTICE
Risk of a leaking coil due to freezing and/or corrosion. Can cause equipment and serious
building damage.
Cooling coils and piping systems that are connected to open cooling towers or other open
water/glycol systems are at high risk for freezing and premature corrosion. Fluids in these
systems must contain the proper antifreeze and inhibitors to prevent freezing and premature
coil corrosion. The water or water/glycol solution must be analyzed by a competent water
treatment specialist before startup to establish the inhibitor requirement. The water or
water/glycol solution must be analyzed every six months to determine the pattern of inhibitor
depletion. The complexity of water-caused problems and their correction makes it important
to obtain the advice of a water treatment specialist and follow a regularly scheduled
maintenance program.

NOTICE
Risk of overhead interference. Can cause unit and/or building damage.
The unit may be too tall to fit through a doorway while on the skid. Measure the unit and
doorway heights and refer to the installation plans to verify clearances prior to moving the
unit.

NOTICE
Risk of damage from forklift. Can cause unit damage.
Keep tines of the forklift level and at a height suitable to fit below the skid and/or unit to
prevent exterior and/or underside damage.

NOTICE
Risk of improper storage. Can cause unit damage.
Keep the Liebert CW upright, indoors and protected from dampness, freezing temperatures
and contact damage.

Liebert CW 2
 Liebert CW Nomenclature

1.0 LIEBERT CW NOMENCLATURE

CW 026 D C S A 2 1234 A

CW = Liebert CW D = Downflow A = 460/3/60 XXXX

Floor Mount U = Upflow B = 575/3/60
Chilled Water C = 208/3/60
Unit D = 230/3/60
2 = 380/3/60
Nominal Capacity, kW C = Chilled Water F = 380/3/50
026 G = 415/3/50 A-Z = Standard
038 M = 380-415/3/50 configuration
041 S = SFA
051
060
076 S = Centrifugal Fan with Standard 2 = 2-Way Valve, Standard Pressure
084 Motor 3 = 3-Way Valve, Standard Pressure
089 V = Centrifugal Fan with Variable 1 = 2-Way Valve, High Pressure
106 Speed Drive T = 3-Way Valve, High Pressure
114 1 = EC Motorized Impeller
146 H = EC Motorized Impeller with THD
181
300
400

3 Liebert CW
 Pre-Installation Guidelines

2.0 PRE-INSTALLATION GUIDELINES

2.1 Room Preparation

Verify that the floor is level, solid and sufficient to support the unit. See Table 2 for unit weights.
Confirm that the room is properly insulated and has a sealed vapor barrier.
For proper humidity control, keep outside or fresh air to an absolute minimum (less than 5% of
total air circulated in the room).
Do not install Liebert CW units in an alcove or at the end of a long, narrow room.
Install the units as close as possible to the largest heat load.
Allow at least the minimum recommended clearances for maintenance and service. See
Figures 4 through 30 for dimensions.
Emerson recommends installing an under-floor water detection system. Contact your local Emer-
son representative for information.

2.2 Location Considerations

For a downflow unit, the unit can sit on an accessible, elevated flooring system. It may be necessary to
furnish additional pedestal support below the unit to ensure maximum structural support. A separate
floor stand for the unit may be used as support, independent of the elevated floor and installed prior
to the flooring system.
For downflow and upflow units, provide approximately 34" (864mm) service clearance on the left,
right and in front of the unit whenever possible. The minimum space required for service is
18" (457mm) on the left end, 18" (457mm) on the right end and 24" (610mm) in front of the unit. This
space is necessary to permit routine maintenance, such as replacing filters and adjusting the fan
speed. On downflow units and upflow CW106 and CW114 models, left- and right-end minimum
clearances are 0" (0 mm), with the exception of rear return.
Avoid installing units in an alcove or at the extreme end of a room that has a high aspect ratio (long
narrow room). Also avoid installing units too close together. This tends to reduce the effectiveness of
the air distribution as compared to units located 30-40 feet (9-12m) apart.

2.3 Installing Liebert CW300 and Liebert CW400 Units

Installing Liebert CW300 and Liebert CW400 differ from methods to install other Liebert CW units;
for details, refer to Appendix A - Installing Liebert CW300 and Liebert CW400.

2.4 Air DistributionDownflow Units

Verify that the raised floor has been properly sized for the units airflow and the room is free of
airflow restrictions.
Perforated floor tiles in the raised floor should ensure minimal pressure loss.
The raised floor must provide 7-1/2" (191mm) of clearance.
Ensure that there is adequate clearance above the unit for service, such as replacing filters.
Optional plenums are available for downflow unit ducting.
If installing units with electrically commutated fans (EC fans), there must be 24" minimum clear-
ance below the unit to lower the fans. Fans may also remain the in unit if desired.
A filter plenum is required for Liebert CW146 and CW181 units.

NOTE
The floor stand used with EC units is not symmetrical and its orientation to the Liebert CW is
critical to lowering the EC fans. Unless the floor stand is installed in the correct position, the
blowers will not lower into the floor stand.

Liebert CW 4
 Pre-Installation Guidelines

Figure 1 Downflow unit ducting and plenum ducting

Field-Fabricated
Ductwork

Field Service Access

for filter replacement
(minimum height of Field-Fabricated
12" [305mm]; minimum Ductwork
distance from unit,
2" [51mm])

Provided Service
Access Door for
filter replacement

Optional
DIRECT UNIT DUCTING Liebert
Plenum

PLENUM DUCTING

5 Liebert CW
 Pre-Installation Guidelines

2.5 Air DistributionUpflow Units

Various configurations are available:
Front return
Rear return
Bottom return (not available on CW106 and CW114 models)
For in-room applications with supply and return grilles, several feet of clearance must be maintained
at the intake and discharge of the unit. For a bottom return, at least 6-8 inches of unrestricted under-
floor height is needed.
Upflow rear-return configurations use a filter box attached to the back of the Liebert CW. Allow 25"
(635 mm) on one side of the unit for access to the rear return filter box. Refer to the filter box
installation sheet, which can be found inside the rear return filter box package.
For ducted applications, duct flanges are supplied on the blower outlets. Follow the SMACNA-Duct
Construction Standard for single-, dual-, or triple-blower systems. Do not run ductwork off the
perimeter flange on the top of the unit. This flange is for positioning and attaching the optional air
discharge plenum with grille. Attaching a duct to this flange may reduce airflow to inadequate levels.

! WARNING
Risk of high-speed moving parts. Can cause injury or death. Disconnect all local and remote
electric power supplies and make sure blowers and pulleys have stopped rotating before
working in the unit.
Do not operate upflow units without installing a plenum, ductwork or guard over the blower
opening(s) on the top surface of the unit cabinet.
Ductwork must be connected to the blower(s), or a plenum must be installed on the blower
deck for protection from rotating blower wheel(s) on upflow units.

Figure 2 Upflow ducting configurations with centrifugal fans

2
1
2

1
1

1 Straight section of duct off of unit to be 1.5 to 2.5 times

the longest blower dimension.
2 Typical ducting shown; ducting may run to either side. DPN001156
* Follow standard practices on all duct work. Rev. 0

NOTE
Drain traps are qualified to a return duct static of negative 1.5 i.w.g. (-1.5 i.w.g).

Liebert CW 6
 Pre-Installation Guidelines

Figure 3 Plenum ducting arrangementUpflow models with EC fans

Typical ducting shown

may run either direction.

Ducting attached
to provided plenum
flanges only.

Follow standard practices DPN002390

in all duct work. Rev. 0

2.6 Connections and System Setup

Plan the routing of wiring, piping and ductwork to the unit. See Figures 63 through 73 and
Figures 75 through 87 for unit connection locations.
The unit requires a drain, which must comply with all applicable codes. This drain line may con-
tain boiling water. See 7.1.1 - Condensate PipingField-Installed for details.
Three-phase electrical service is required for all models. Electrical service must conform to
national and local electrical codes. See the equipment nameplate for details.
If seismic requirements apply, consult your local Emerson representative for information about a
seismic-rated floor stand.

2.7 Operating Conditions

2.7.1 Cooling, Humidification and Dehumidification
The Liebert CW must be operated in a conditioned space within the operating envelope ASHRAE
recommends for data centers: Maximum dew point of 59F (15C).
Operating outside this envelope can decrease equipment reliability.
Return air to the Liebert CW must be no cooler than the ASHRAE recommendation of 68F (20C) DB
and 40% RH or minimum WB of 54F (12.2C) for proper unit operation.
Operating below this can decrease equipment reliability.
Refer to ASHRAEs publication, Thermal Guidelines for Data Processing Environments.

2.7.2 Heating
The Liebert CW is qualified for heating-only operation at temperatures not exceeding 80F (27C).

7 Liebert CW
 Liebert CW Dimensions and Weights

3.0 LIEBERT CW DIMENSIONS AND WEIGHTS

Table 1 Shipping dimensions
Domestic Packed Export Packed
Model in. (mm) in. (mm)
55x40x76 58x41x82
026, 028, 031
(1400x1020x1930) (1470x1040x2080)
77x40x76 80x41x82
051, 060
(1960x1020x1930) (2030x1040x2080)
102x40x76 105x41x82
076, 084
(2590x1020x1930) (2670x1040x2080)
125x40x80 128x41x82
089, 106, 114
(3180x1020x2030) (3250x1040x2080)
125x53x80 128x54x82
146, 181
(3180x1350x2030) (3250x1370x2080)
125x53x80 128x54x82
300, 400*
(3180x1350x2030) (3250x1370x2080)
1. Models CW300 and CW400 ship in two separate sections, each the size shown.

Table 2 Shipping weights

Domestic Export
Packaging Packaging
Model lb. (kg) lb. (kg)
026 805 (365) 1030 (467)
038 840 (381) 1065 (483)
041 890 (404) 1115 (506)
051 1135 (515) 1360 (617)
060 1200 (544) 1425 (646)
076 1380 (625) 1630 (739)
084 1480 (671) 1730 (785)
089 1800 (817) 2075 (942)
106 1950 (885) 2225 (1,009)
114 2090 (949) 2365 (1,073)
146 2900 (1,314) 3200 (1,450)
181 2900 (1,314) 3200 (1,450)
300 * 5800 (2,628) 6400 (2,900)
400 * 5800 (2,628) 6400 (2,900)
* Models CW300 and CW400 ship in two separate sections,
each weighing half of the amount shown.

Liebert CW 8
 Liebert CW Dimensions and Weights

3.1 DimensionsDownflow Models with EC Fans

Figure 4 Cabinet and floor planning dimensions, downflow models CW026 - CW084 with EC fans
A
J Overall
ension Dimen J
Projection of Overall Dim sio n on A
Dimensi Overall
Display Bezel C Projection of Overall Dimen
Unit an sio
d Plenu n
C
3/4" (19mm) Display Bezel
D 2" Unit Cab
inet m
B 3/4" (19mm) 1"
2" (50.8mm) F
Air Return Air R
(50.8mm) Opening
etu r n Op Plenum (25.4mm)
ening 1"
Overall
(25.4mm) K
1" Air Retu
rn Air R B
Opening
eturn
72" (25.4mm) Op ening
(1829mm) 2"
(50.8mm)
Pre-Filter
9"
Plenum
(228mm)

72"
1" (1829mm)
Un E
it B (25.4mm)
Shaded areas indicate as
e
a recommended clearance
of 36" (914mm) for component F se
access and filter removal. it Ba
Un

UNIT DIMENSIONAL DATA

MODELS WITH PRE-FILTERS
1" 1"
(25.4mm) Reheat or Humidifier Piping
F (25.4mm) Reheat or Humidifier Piping
3" 3" Opening (Optional Steam &
Opening (Optional Steam & (76.2mm)
(76.2mm) G Hot Water Only)
G Hot Water Only) 9"
9" (228mm) (228mm)
1" Air Discharge
1" (25.4mm) Air Discharge (25.4mm)
Opening Opening
H L
20" 20"
(508mm)
(508mm) M
20"
(508mm) 1"
(25.4mm)
1" (25.4mm)
Standard Piping E
& Electrical Opening E
18" Standard Piping
Fl (457mm) & Electrical Opening 31" (787.4mm)
oo Fl
Floor Cutout Dimensions rL
ev oo
e rL
for Units with Centrifugal Fans l ev
el
Floor Cutout Dimensions DPN001659
for Units with EC Fans Rev. 1

Dimensions, inches (mm) Net

H L M Weight
Model A B C D E F G (FC Only) J K (EC Only) (EC Only) lb (kg)
50 46 35 32 48 33 8 37 35-5/8 31 28 2-7/8 760
CW026
(1270) (1168) (889) (813) (1219) (883) (203) (940) (905) (787) (711) (73) (345)
50 46 35 32 48 33 8 37 35-5/8 31 28 2-7/8 795
CW038
(1270) (1168) (889) (813) (1219) (883) (203) (940) (905) (787) (711) (73) (361)
50 46 35 32 48 33 8 37 35-5/8 31 28 2-7/8 855
CW041
(1270) (1168) (889) (813) (1219) (883) (203) (940) (905) (787) (711) (73) (388)
74 70 35 32 72 33 8 61 35-5/8 31 51 2-7/8 1090
CW051
(1880) (1778) (889) (813) (1829) (883) (203) (1549) (905) (787) (1295) (73) (494)
74 70 35 32 72 33 8 61 35-5/8 31 51 2-7/8 1115
CW060
(1880) (1778) (889) (813) (1829) (883) (203) (1549) (905) (787) (1295) (73) (524)
99 95 35 32 97 33 15-1/4 78-3/4 35-5/8 31 60-3/4 8-7/8 1320
CW076
(2515) (2413) (889) (813) (2464) (883) (387) (2000) (905) (787) (1543) (225) (599)
99 95 35 32 97 33 15-1/4 78-3/4 35-5/8 31 60-3/4 8-7/8 1420
CW084
(2515) (2413) (889) (813) (2464) (883) (387) (2000) (905) (787) (1543) (225) (644)
Source: DPN001659, Rev. 1

9 Liebert CW
 Liebert CW Dimensions and Weights

Figure 5 Cabinet and floor planning dimensions, CW026, CW038 and CW041, downflow with EC fans, front
discharge

46" (1168mm)
Opening Customer Piping and Wiring Connections
Standard bottom connections require unit to
be placed on a floor stand at least
9" (229mm) high.
35"
(889mm) If unit is to be placed directly on the
31" Return Air
(787mm) floor, an additional SFA is required to
Opening
Opening 33" relocate customer connections
(838mm)

3/4"
TOP VIEW
(19mm)
Bezel
50" (1270mm)

36"
(914mm)

72"
(1829mm)

36"
(914mm)

29-3/4" Striated area indicates the

(754mm)
16" recommended minimum
(408mm) Air Discharge clearance for component
3"
Opening access
(76mm)

2" 310807
FRONT VIEW
(51mm) Pg. 1, Rev. 0
48" (1219mm)

Liebert CW 10
 Liebert CW Dimensions and Weights

Figure 6 Cabinet and floor planning dimensions, CW051, CW060, CW076 and CW084, downflow with EC
fans, front discharge
C Opening

35"
31" (889mm)
(787mm) Return Air
Opening Opening 33"
(838mm)

TOP VIEW 3/4"

(19mm)
Bezel

36"
B (914mm)

72"
(1829mm) 36"
16" 16" Striated area indicates the
(914mm)
(408mm) (408mm) recommended minimum
clearance for component
access
E F
Air Discharge Air Discharge 3-1/8" Customer Piping and Wiring Connections
Opening Opening (79mm) Standard bottom connections require unit to
be placed on a floor stand at least
9" (229mm) high.
FRONT VIEW G
D
If unit is to be placed directly on the
A
floor, an additional SFA is required to
310807 relocate customer connections
Pg. 2, Rev. 0

Dimensions inches (mm)

Model A B C D E F G
CW051 72 (1829) 74 (1880) 70 (1778) 2.0 (51) 25.0 (636) 25.3 (643) 30.1 (764)
CW060 72 (1829) 74 (1880) 70 (1778) 2.0 (51) 25.0 (636) 25.3 (643) 30.1 (764)
CW076 97 (2464) 99 (2515) 95 (2413) 8.0 (203) 28.6 (727) 28.8 (730) 41.9 (1064)
CW084 97 (2464) 99 (2515) 95 (2413) 8.0 (203) 28.6 (727) 28.8 (730) 41.9 (1064)

11 Liebert CW
 Liebert CW Dimensions and Weights

Figure 7 Cabinet and floor planning dimensions, downflow models CW106 and CW114 with EC fans
G
Overall
n
Dimensio
Projection Of Overa A
C ll Dime
Display Bezel nsion
3/4" (19mm)
D
turn Air R B
2" (50.8mm) Air Re g eturn G
Openin Open
in g O ve r a
ll
2" sion
(50.8mm) Dimen Overall
A
Dim
C Unit and ension
Projection Of Plenum
76" abinet
(1930mm) Display Bezel Unit C
3/4" (19mm)
Plenum
1" Overall
(25.4mm) H
2" Air Re
turn Air Re B
Openin
g turn O
(51mm) pe n ing
2"
(50.8mm)
Pre-Filter
Plenum 9"
(228mm)
E
Shaded area indicates
Unit Base 1"
a recommended
clearance of 36" (914mm) (25.4mm)
F
for component access Unit Base
and filter removal 76"
(1930mm)
UNIT DIMENSIONAL DATA

20"
(508mm)
Air Discharge Opening
1" (25.4mm) 77"
(1955.8mm)
28" 26" MODELS WITH PRE-FILTERS
(711mm) (660.4mm)

*Note: "Electrical Opening" is also

E used for drain connection of
Standard Piping 10" 1" (25.4mm) optional steam generating
Opening (254mm) 24" canister humidifier
(609.6mm) 16-1/4"
* Electrical *This drawing pertains to CW106 & CW114
6" ( 1 5
Opening 1" 2.4mm (412.75mm) with forward-curve blowers only.
)
(25.4mm)
DPN001660
Rev. 0
FLOOR CUTOUT DIMENSIONS

Dimensions, inches (mm) Net

Weight
Model A B C D E F G H I lb (kg)
122 118 35 31 120 33 35-5/8 30 34 1785
CW106
(3099) (2997) (889) (787) (3048) (838) (905) (762) (864) (810)
122 118 35 31 120 33 35-5/8 30 34 1925
CW114
(3099) (2997) (889) (787) (3048) (838) (905) (762) (864) (873)
Source: DPN001660, Rev. 0

Liebert CW 12
 Liebert CW Dimensions and Weights

Figure 8 Cabinet and floor planning dimensions for downflow models CW089, CW106 and CW114 with
EC fans
118" Opening
(2997mm)
Notes: Filters are accessible
from front of unit only.
Electrical connections
30-3/4" 35" can be made from the
(781mm) 33" (889mm) bottom of unit.
Opening (838mm)

3/4" TOP VIEW

(19mm)
Bezels

122"
(3099mm)
36"
(914mm)

76" 24"
(1930mm) (610mm)

Striated area indicates the

recommended minimum
clearance for component access.
Shaded area indicates the
required minimum clearance
120" below the unit to lower the
(3048mm) fans. Fans may also remain
1-1/2"
(38mm) in unit if desired.
FRONT VIEW
DPN001614
Rev. 1

Weight
Model lb (kg)
CW089 1925 (873)
CW106 1785 (810)
CW114 1925 (873)
Source: DPN001659, Rev. 1

13 Liebert CW
 Liebert CW Dimensions and Weights

Figure 9 Cabinet and floor planning dimensions, CW146 - CW181, downflow with EC fans, front
discharge
15" (381mm)

117-3/4" (2989mm)
Opening
Piping 9-5/8"
Connections (244mm)
42"
(1067mm)
Opening

Detail A

45" TOP VIEW 3/4" (19mm)

(1143mm) Bezel

18" (457mm)
Filter Plenum

94"
(2386mm)
Total Height
76"
(1930mm) 18-7/8" 18-7/8" 18-7/8"
Base Unit (478mm) (478mm) (478mm)
A 29-1/2"
(749mm)
27-5/8"
(700mm)
30-3/4"
(779mm)
3-1/8" Air Discharge Air Discharge Air Discharge 3-1/4"
Opening Opening Opening (83mm)
(78mm)
36-3/8"
4-5/8" (117mm) FRONT VIEW
1-1/2" (924mm)
68-1/4" 1-1/2"
LEFT END (38mm) (38mm)
(1734mm)
45" (1143mm) 1" 120" (3048mm)
37" (940mm) (25mm) 122" (3099mm)

Filter Plenum
(shipped separately

Filters are removed 18-7/8" 18-7/8" 18-7/8"

through the front (478mm) (478mm) (478mm)
of the plenum
30-3/4" 27-5/8" 29-1/2"
(779mm) (700mm) (749mm)
3-1/4" Air Discharge Air Discharge Air Discharge
(83mm) Opening Opening Opening
48" 36-3/8"
(1219mm) (924mm) REAR VIEW
1-1/2"
(38mm) 68-1/4"
(1734mm)
Customer Piping and Wiring Connections
CW146 or Standard bottom connections require unit to be placed
CW181 on a floor stand at least 9" (229mm) high.
Base Unit If unit is to be placed on the floor, an opening is provided
Striated area indicates the in front left end panel for piping and high voltage wire routings.
310807 recommended minimum Customer must drill holes in right end panel to route
Pg. 4, Rev. 0 clearance for component low-voltage connections to standard location
access (must be routed separate from any high voltage wires).

Liebert CW 14
 Liebert CW Dimensions and Weights

Figure 10 Cabinet and floor planning dimensions for downflow models CW146 and CW181 with EC fans
117-11/16" (2989mm)
Opening

42"
(1067mm) 3/4"
45" Opening (20mm)
(1143mm) BEZELS
Plenum

18"
(457mm)
Filter Plenum

94"
(2388mm)
Total Height
76"
(1930mm)
Base Unit

Liebert
CW146
and CW181

45" 120"
(1143mm) 1" (3044mm) 1-1/2"
(25mm) 122" (38mm)
47"
typical (3099mm)
(1194mm)
Note: Typical CW166 and CW181
with EC fans unit orientation shown.
Filters are removed Filter Plenum
through the (shipped separately)
front of the plenum.

Reference DPN001693
for the electrical
CW146 or CW181
and plumbing
base unit
requirements.
48"
(1219mm)
Striated area indicates
the recommended
24"
minimum clearance
(610mm)
for component access.

Shaded area indicates the required minimum clearance DPN001707

below the unit to lower the fans into the floo r. Fans may Rev. 2
also remain in their shipped position.

Weight
Model lb (kg)
CW146 2520 (1143)
CW181 2520 (1143)
Source: DPN001707, Rev. 2

15 Liebert CW
 Liebert CW Dimensions and Weights

Figure 11 Dimensions and floor planning data downflow models CW300, CW400 with EC fans and filter
plenums
118" (2997mm)
Opening

Refer to DPN001693
for the electrical and
plumbing requirements. 87"
(2210mm)
Opening
For information on installing CW300
and CW400 units, refer to Appendix A -
Installing Liebert CW300 and Liebert
CW400
3/4"
(19mm)
Bezels

91" (2311mm) 1" 18" (457mm)

(25mm)

94"
(2388mm)

76"
1930mm

45" 1" 120" (3048mm)

(1143mm) 1-1/2" (38mm)
(25mm)
92" (2337mm) 122" (3099mm)

Filter Plenum
Filters are removed (shipped
by removing front separately)
panel of the plenum.
Two Cabinets

36"
(914mm)

48"
(1219mm) 24" (610mm)

Striated area indicates the recommended

minimum clearance for component access.
Shaded area indicates the minimum required area below DPN002432
the unit to be unobstructed for the skirted floorstand Rev. 0
and fan service clearance.

Liebert CW 16
 Liebert CW Dimensions and Weights

3.2 DimensionsUpflow Models with EC Fans

Figure 12 Cabinet and floor planning dimensions, upflow models CW026-CW084 with EC fans, front air
return
Duct flanges on plenum
35" top for supply air ducting when
(889mm) solid panel plenum is used
Projection of
Overall B
Display Bezel
3/4" (19mm) Overall

A
Plenum

1"
(25mm)

72"
Return Air Grille (1829mm)
Supplied on Unit
Units with Front Return

Shaded areas
indicate a recommended
clearance of 36" (914mm)
for component access
and filter removal

EC Fan
Terminal Box

C 1"
Base (25mm)
33"
75-1/4" (838mm)
72" Base
(1911mm)
(1829mm)
FRONT AIR RETURN MODEL SHOWN

DPN002386
Pg. 1, Rev. 1

Left Side Detail View Without

Plenum or EC Fans

Dimensions, in. (mm)

Plenum Height, Dimension A
Model B C Supply Air in. (mm)
CW026, CW038, CW041 50 (1270) 48 (1219) Grille Discharge 22.75 (578)
CW051, CW060 74 (1880) 72 (1829) Top Discharge 22.75 (578), 30 (762), 36 (914)
CW076, CW084 99 (2515) 97 (2464)
Source: DPN002836, Pg. 1, Rev. 1

17 Liebert CW
 Liebert CW Dimensions and Weights

Figure 13 Cabinet and floor planning dimensions, upflow models CW026 - CW084 with EC fans, bottom air
return

1"
(25mm)

REAR AIR RETURN MODEL

Return
A Air Opening
33"
(838mm)
B 22"
(559mm)
D
C
1-1/8"
(29mm)

E
5-1/2" F
(140mm)
Floor Cutout Dimensions
Return Air Opening Bottom Air Return Model DPN002386
Pg. 2, Rev. 1
Dimensions, in. (mm) Net Weight lb (kg)
Chilled
Water Unit w/Plenum
ModeL A B VC D E F Unit Only and Fans
CW026 44 (1118) 18 (457) 5 (127) 3 (76) 46 (1168) 48 (1219) 518 (235) 750 (340)
CW038 44 (1118) 18 (457) 5 (127) 3 (76) 46 (1168) 48 (1219) 542 (246) 774 (351)
CW041 44 (1118) 18 (457) 5 (127) 3 (76) 46 (1168) 48 (1219) 589 (267) 821 (372)
CW051 68 (1727) 20 (508) 4 (102) 3 (76) 70 (1778) 72 (1829) 755 (342) 1118 (507)
CW060 68 (1727) 20 (508) 4 (102) 3 (76) 70 (1778) 72 (1829) 827 (375) 1190 (540)
CW076 86 (2184) 18 (457) 5 (127) 6-1/2 (165) 95 (2413) 97 (2464) 1141 (518) 1566 (710)
CW084 86 (2184) 18 (457) 5 (127) 6-1/2 (165) 95 (2413) 97 (2464) 1239 (562) 1664 (755)
Source: DPN002386, Pg. 2, Rev. 1

Liebert CW 18
 Liebert CW Dimensions and Weights

Figure 14 Cabinet and floor planning dimensions, upflow models CW106, CW114 with EC fans, front
return

Note: Duct flanges on plenum

EC Fan Terminal Box 35" top for supply air ducting when
Projection of (889mm) solid panel plenum is used.
Display Bezel Overall
3/4" (19mm) 122"
(3099mm)
Overall

A
Plenum
79-1/4"
76" (2013mm)
(1930mm)

76" 1"
(1930mm) (25mm)
Unit
Left Side Detail View Without
Plenum or EC Fans
Return Air Grille
Supplied on
Units With Front
Air Return

Shaded areas
indicate a recommended
clearance of 36" (914mm)
for component
access and filter removal

Front Air Return Model Shown

120"
1"
(3048mm)
(25mm)
Base
33"
DPN002387 (838mm)
Pg. 1, Rev. 1 Base

19 Liebert CW
 Liebert CW Dimensions and Weights

Figure 15 Cabinet and floor planning dimensions, upflow models CW106, CW114 with EC fans, rear return

24-1/4"
(616mm)

Return Air Filter Opening

117-1/2"
(2984mm)

2-1/4"
(57mm)

22"
(559mm)

Shaded area indicates a recommended

clearance of 25" (635mm) for rear return DPN002387
filter removal on one end of the unit Pg. 2, Rev. 1
Net Weight, lb. (kg)
Unit with Plenum
Model Unit Only And Fans
CW106 1240 (562) 1827 (829)
CW114 1375 (624) 1962 (890)
Source: DPN002387, Pg. 2, Rev. 1

Liebert CW 20
 Liebert CW Dimensions and Weights

3.3 DimensionsDownflow Models With Centrifugal Fans

Figure 16 Cabinet and floor planning dimensions, downflow models CW106 and CW114 with centrifugal
fans
G
Overall
n
Dimensio
Projection Of Overa A
C ll Dime
Display Bezel nsion
3/4" (19mm)
D
turn Air R B
2" (50.8mm) Air Re g eturn G
Op in
e n Open
in g O ve r a
ll
2" e n s io n
(50.8mm) Dim Overall
A
Dim
C Unit and ension
Projection Of Plenum
76" a binet
(1930mm) Display Bezel Unit C
3/4" (19mm)
Plenum
1" Overall
(25.4mm) H
2" Air Re
turn Air Re B
Openin
g turn O
(51mm) pe n ing
2"
(50.8mm)
Pre-Filter
Plenum 9"
(228mm)
E
Shaded area indicates
Unit Base 1"
a recommended
clearance of 36" (914mm) (25.4mm)
F
for component access Unit Base
and filter removal 76"
(1930mm)
UNIT DIMENSIONAL DATA

20"
(508mm)
Air Discharge Opening
1" (25.4mm) 77"
(1955.8mm)
28" 26" MODELS WITH PRE-FILTERS
(711mm) (660.4mm)

*Note: "Electrical Opening" is also

E used for drain connection of
Standard Piping 10" 1" (25.4mm) optional steam generating
Opening (254mm) 24" canister humidifier
(609.6mm) 16-1/4"
* Electrical *This drawing pertains to CW106 & CW114
6" ( 1 5
Opening 1" 2.4mm (412.75mm) with forward-curve blowers only.
)
(25.4mm)
DPN001660
Rev. 0
FLOOR CUTOUT DIMENSIONS

Dimensions, inches (mm) Net

Weight
Model A B C D E F G H I lb (kg)
122 118 35 31 120 33 35-5/8 30 34 1785
CW106
(3099) (2997) (889) (787) (3048) (838) (905) (762) (864) (810)
122 118 35 31 120 33 35-5/8 30 34 1925
CW114
(3099) (2997) (889) (787) (3048) (838) (905) (762) (864) (873)
Source: DPN001660, Rev. 0

21 Liebert CW
 Liebert CW Dimensions and Weights

3.4 DimensionsUpflow Models With Centrifugal Fans

Figure 17 Cabinet and floor planning dimensions, upflow models CW026-CW084 with centrifugal fans
35-5/8"
)
(905mm A
mension Overa
Projection of Overall Di ll Dime L
35" nsion Duct Flanges on two blowers
Display Bezel )
3/4" (19mm) (889mm
H
1" K
(25.4mm) J M J

Front of Unit
Duct Flanges on 1 blower
72"
(1829mm)

H
K
J
Front of Unit

1" (25.4mm) Flang

for Plenum Connection

Note: Flanges
Air grille may provided on
be supplied on Blower(s)
units with front outlet for
or rear return air. supply air
Un B ducting.
Shaded area indicates it B
a recommended clearance as
e " )
of 36" (914mm) for component 3 3 mm
access and filter removal. Refer to 8 38 se 1"
( a
the user manual for it B (25.4mm)
recommended minumum Un 1"
clearance. Unit Dimensional Data (25.4mm)

5-1/2"
33" m) (139.7mm)
8m 22"
(83
(559mm) g
in
1-1/8" D pen
(28.6mm) Air Return Opening O
rn
e tu
A return air grille
rR
G Ai may be ordered in
Air Return place of the duct
Opening flange. See specification
C sheet for option supplied.
B F
E
Fl
oo
Models with Rear Return
rL
ev
el
DPN001661
Floor Cutout Dimensions Rev. 1
Models with Bottom Return

Dimensions, inches (mm) Net

# of Weight
Model Blowers A B C D E F G H J K L M lb (kg)
50 48 46 44 3 5 18 15-7/8 18-5/8 2-3/16 17-3/8 760
CW026 1 _
(1270) (1219) (1168) (1118) (76) (127) (457) (403) (473) (55) (454) (345)
50 48 46 44 3 5 18 15-7/8 18-5/8 2-3/16 17-3/8 795
CW038 1 _
(1270) (1219) (1168) (1118) (76) (127) (457) (403) (473) (55) (454) (361)
50 48 46 44 3 5 18 15-7/8 18-5/8 2-3/16 17-3/8 855
CW041 1 _
(1270) (1219) (1168) (1118) (76) (127) (457) (403) (473) (55) (454) (388)
74 72 70 68 3 4 20 15-7/8 14-5/8 2-3/16 20-3/8 11-1/4 1090
CW051 2 (1880) (1829) (1778) (1727) (76) (102) (508) (403) (371) (55) (517) (286) (494)
74 72 70 68 3 4 20 15-7/8 14-5/8 2-3/16 20-3/8 11-1/4 1155
CW060 2 (1880) (1829) (1778) (1727) (76) (102) (508) (403) (371) (55) (517) (286) (524)
99 97 95 68 6-1/2 5 18 15-7/8 18-5/8 3-1/4 20-5/8 12-5/8 1320
CW076 2 (2515) (2464) (2413) (1727) (165) (127) (457) (403) (473) (82) (524) (321) (599)
99 97 95 68 6-1/2 5 18 15-7/8 18-5/8 3-1/4 20-5/8 12-5/8 1420
CW084 2 (2515) (2464) (2413) (1727) (165) (127) (457) (403) (473) (82) (524) (321) (644)
Source: DPN001661, Rev. 0

Liebert CW 22
 Liebert CW Dimensions and Weights

Figure 18 Cabinet and floor planning dimensions upflow models, CW106 and CW114 with centrifugal fans

122" Overall
(3099mm)
Duct Flanges on 3 Blowers
A B
35" Overall
(889mm) 122" Overall
Projection of Display (3099mm)
32" D 35"
Bezel 3/4" (19mm)
(813mm) (889mm)
Plenum 118" Ref.
2" (51mm) C E C E C
Flange (2997mm)
Plenum Flange
Front of Unit
Blower Duct Flange Location

2" Top of Unit

76" (51mm) Blower Deck F
(1930mm)

76"
(1930mm) Ref.

Front or Rear Air Supply

1" (25mm) flange

for decorative
plenum alignment
Air grille Flanges provided
supplied on on blower outlets
units with front for supply air ducting.
return air only

Shaded areas indicate 1"

a recommended clearance 120" Base (25mm)
(3048mm) 33" Base
of 36" (914mm) for component
(838mm)
access and filter removal.
Unit Dimensions

Filter Access
(Both Ends) 24-1/4" (616mm)

Shaded area indicates

117-1/2" Air Return
a recommended clearance
(2985mm) Opening
of 25" (635mm) for rear
return filter removal
on one end of the unit.
2-1/4"
(57mm)
22" (559mm)
DPN001662
4" (102mm)
Duct Connections Rev. 2
Models With Rear Return

Dimensions, inches (mm

Motor
Model Blower Supply hp A B C D E F
Top Front 10-15 27-1/2 (699) 3-1/2 (89) 18-11/16 (475) 16-3/16 (411) 10 (254) 4-1/2 (114)
15 x 15
Top Rear 10-15 27-1/2 (699) 12-5/16 (313) 18-11/16 (475) 16-3/16 (411) 10 (254) 4-1/2 (114)
CW106
10-15 30 (762) 3-1/2 (89) 14-3/4 (375) 16-3/16 (411) 10 (254) 4-1/2 (114)
CW114 Top Front
15 x 11 20 30 (762) 3-1/2 (89) 14-3/4 (375) 16-3/16 (411) 10 (254) 4-1/2 (114)
Top Rear 10-20 30 (762) 12-5/16 (313) 14-3/4 (375) 16-3/16 (411) 10 (254) 4-1/2 (114)

23 Liebert CW
 Liebert CW Dimensions and Weights

3.5 Floor Stand Dimensions

Figure 19 Floor stand and floor planning dimensions, downflow models CW026 - CW041 with EC fans

1" (25mm) 14"

(356mm)
3/4"
(19mm) Piping access area

31-1/2"
(800mm)

3/4" 46-1/2" (1181mm)

(19mm) Support Feet Centers

3/4" 48" (1219mm)

(19mm)
See Note 4

3/4" 33" (838mm)

(19mm) typ
7/8"
(23mm)

3" (76mm) typ A*

49-1/2" (1257mm)
NOTES:
1) This floor stand should be used when EC fans are will be
lowered into a raised floor. The standard Liebert CW
floor stand can be used if the fans will remain in their 34-1/2" (876mm)
original, raised position. Overall Depth
2) All paneled sides of unit overhang the floor stand by 1" (25mm).
3) The floor stand used with EC units is not symmetrical, and its orientation to the
Liebert CW is critical for lowering the EC fans. Unless the floor stand is installed in
the correct position, the blowers will not lower into the floor stand.
4) The jack and jack support are shipped loose and are intended to be placed into position
under each fan and utilized to lower or raise that fan as needed.
DPN002029
* Leveling feet are provided with 1-1/2" (38mm) adjustment from nominal height A. REV 0

Dimension A*
Height, in (mm)
24 (610)
30 (762)
36 (914)
42 (1067)
48 (1219)
Source: DPN00209, Rev. 0

Liebert CW 24
 Liebert CW Dimensions and Weights

Figure 20 Floor stand and floor planning dimensions, downflow models CW076 and CW084 with EC fans

1" 25"
(25mm) (635mm)
Piping access area
3/4"
(19mm)

32"
31-1/2"
(813mm)
(800mm)
Center Feet

3/4" 47-3/4"
(19mm) (1213mm)
95-1/2" (2426mm)
Support Feet Centers
3/4" 97" (2464mm)
(19mm)

See Note 4
7/8"
(23mm) 1" 33" (838mm)
typ (25mm)
3" typ
(76mm) typ
98-1/2" (2502mm)
NOTE:
A*
1) This floor stand should be used when EC fans are intended to be lowered under
a raised floor. The standard Liebert CW floor stand can be used if the fans are to
remain in their original raised position.
2) All paneled sides of unit overhang floorstand 1 (25mm). 35" (889mm)
3) The floor stand used with EC units is not symmetrical and its orientation to the Overall Depth
Liebert CW is critical for lowering the EC fans. Unless the floor stand is installed in
the correct position, the blowers will not lower into the floor stand.
4) Jack and jack support are shipped loose and are intended to be placed into position
under each fan and utilized to lower or raise that fan as needed. DPN002027
*Leveling feet are provided with 1-1/2 (38mm) adjustment from nominal height A. Rev. 0

Dimension A*
Height, in (mm)
24 (610)
30 (762)
36 (914)
42 (1067)
48 (1219)
Source: DPN002027, Rev. 0

25 Liebert CW
 Liebert CW Dimensions and Weights

Figure 21 Floor stand and floor planning dimensions, downflow models CW089, CW106 and CW114 with
EC fans

20-1/4"
1"
(514mm)
(25mm) Piping access
3/4" area
(19mm)

31-1/2"
32" (813mm)
(800mm)
Center Feet

59-1/4"
(1505mm)
3/4" 118-1/2" (3010mm)
(19mm) Support Feet Centers

3/4" 120" (3048mm)

(19mm)
Typ

See Note 4
7/8" 1" 33"
(22mm) (25mm) (838mm)
Typ TYP
3" (76mm) TYP
121-1/2" (3086mm) A*
Overall Width

NOTES 35" (889mm)

1. This floor stand should be used when EC fans are intended to be lowered into Overall Depth
the floor stand. The standard Liebert CW floor stand can be used if the fans
are to remain in their original raised position. Height, in. (mm)
2. All paneled sides of unit overhang floorstand 1" (25mm). A*
3. The floor stand used with EC units is not symmetrical, and its orientation to the 24 (610)
Liebert CW is critical for lowering the EC fans. Unless the floor stand is installed 30 (762)
in the correct position, the blowers will not lower into the floor stand. 36 (914)
4. Jack and jack support are shipped loose and are intended to be placed into 42 (1067)
position under each fan and utilized to lower or raise that fan as needed.
48 (1219)
* Leveling feet are provided with 1-1/2" (38mm) adjustment from nominal height A.
DPN001629
Rev. 4

Liebert CW 26
 Liebert CW Dimensions and Weights

Figure 22 Floor stand and floor planning dimensions, downflow models CW146 and CW181 with EC fans

1" 20-1/4"
(25mm) (514mm)
Piping access
3/4" area
(19mm)

43-1/2" 44"
(1105mm) (1118mm)
CENTER FEET

59-1/4"
(1505mm)
3/4" 118-1/2"
(19mm) (3010mm)
Support Feet Centers
3/4"
120" See Note 4
(19mm)
(3048mm)
TYP 1"
45"
(25mm)
(1143mm)
TYP

7/8"
(23mm) A*
TYP
3" (76mm) 121-1/2" (3086mm)
Overall Depth 47"
(1194mm)
NOTE: Overall Depth
1. This floor stand should be used when EC fans are intended to be lowered into
the floor stand. The standard Liebert CW floor stand can be used if the fans Height in (mm)
are to remain in their original, raised position. A*
2. All paneled sides of unit overhang floor stand 1" (25mm).
24 (610)
3. The floor stand used with EC units is not symmetrical, and its orientation to the
30 (762)
Liebert CW is critical for lowering the EC fans. Unless the floor stand is installed
36 (914)
in the correct position, the blowers will not lower into the floor stand.
4. The jack and jack support are shipped loose and are intended to be placed into 42 (1067)
position under each fan and used to lower or raise one fan at a time as needed. 48 (1219)

* Leveling feet are provided with 1-1/2" (38mm) adjustment from nominal heightA.
DPN001696
Rev. 3

27 Liebert CW
 Liebert CW Dimensions and Weights

Figure 23 Floor stand and floor planning dimensionsDownflow CW300 AND CW400 with EC fans

NOTE:
1. This floor stand should be used when
EC fans are permitted to be lowered
into the floor stand.
2. All paneled sides of unit overhang
floor stand 1" (25mm).
3. The floor stand used with EC units
is not symmetrical and its orientation
to the Liebert CW is critical for lowering the
EC fans. Unless the floorstand is
installed in the correct position, the blowers 20-1/4"
will not lower into the floorstand. (514mm) See Note 4
4. Jack and jack support are shipped loose 1" (25mm)
and are intended to be placed into position
under each fan and utilized to
lower or raise that fan as needed.
5. Hatched area for piping access.
43" 42-1/4"
* Leveling feet are provided with 1-1/2" (38mm) (1092mm) (1073mm)
adjustment from nominal height 36" (914mm). Center of
Feet

Height, in. (mm)

4"
A* (102mm)
24 (610) See
30 (762) Note 5
43" 42-1/4"
36 (914) (1092mm) (1073mm)
Center of
42 (1067) Feet
48 (1219)
1" 59-1/4"
(25mm) 4" (1505mm) 3/4"
(102mm) 3/4" (19mm) 118-1/2" (3010mm) (19mm)
Detail A
90" (2287mm) 1" 120" (3048mm) 1" (25mm)
(25mm)

A*

3" (76mm) typ.

46" 7/8"
(1169mm) A 122" (3099mm)
(23mm)
Overall Width
92" (2338mm)
Overall Depth DPN002433
Rev. 0

Liebert CW 28
 Liebert CW Dimensions and Weights

Figure 24 Floor stand dimensions, optional steam, hot water reheat and humidifier piping entrances for
downflow models CW026 - CW84 with centrifugal fans

1"
33" Optional Steam/Hot Water
(25.4mm)
(838mm) Reheat or Humidifier
3 Piping Entrance
8" (76.2mm) E Location
(203mm)
A + 2" (50.8mm) =
Overall Width of Unit Air Discharge
Opening

Standard D 2"
piping and (50.8mm)
electrical
entrance 1"
location (25.4mm)
B
Length of
Vane = D - 1/8" (3mm)
Leg support supplied 16-1/4"
on 18, 21 & 24" high models (413mm)
A
J
C
H 1-1/2" (38mm) *

Optional Turning Vane

62" (1574.8mm)
Field-Installed in
Fan Discharge Opening
For Rear or Front Air
Discharge

* Leveling feet are provided

with 1-1/2" (38mm) adjustment
from nominal height H.

56-3/4" (1441.5mm)
DPN001676
CROSS-BRACING LOCATION FOR 72" FRAMES ONLY Rev. 0

Dimensions, inches (mm) Height in. (mm)

Overall
Model Unit Width A B C D E H* Nominal J
CW026, CW038, CW041 50 (1270) 48 (1219) 0 0 36 (914) 8 (203) 9 (229) 6-1/2 (165)
CW051, CW060 74 (1880) 72 (1829) 0 0 60 (1524) 8 (203) 12 (305) 9 (229)
99 97 48-1/2 48-1/2 77-3/4 15-1/4 15 (381) 12 (305)
CW076, CW084
(2515) (2464) (1232) (1232) (1975) (362) 18 (458) 15 (381)
Source: DPN001676, Rev. 0 21 (553) 18 (458)
24 (610) 21 (553)

29 Liebert CW
 Liebert CW Dimensions and Weights

Figure 25 Floor stand dimensions for downflow models CW106 and CW114 with centrifugal fans

D K
Air Discharge
A + 2" (50.8mm) =
Opening
Overall Width of Unit
1"
(25.4mm) E

Standard G
Piping and
Electrical
1"
Entrance
B (25.4mm)
Location
Leg supports
supplied on models F
18", 21" and 24" high A Length Of
Vane=E-1/8"(3mm)
C
H 1-1/2" (38mm) *
J
Electrical
Opening

*Leveling feet are provided with 1 1/2" (38mm) adjustment from nominal height H.
*This drawing pertains to CW106 & CW114 with forward curve blowers only.
Optional turning vane field-installed
in fan discharge opening for rear
of front air discharge
DPN001677
Rev. 0
Dimensions, inches (mm) Height, in. (mm)
Overall Unit H*
Model Width A B C D E F G K Nominal J

CW106 122 120 60 60 33 100-3/4 16-1/4 8-1/4 11 9 (229) 6-1/2 (165)

CW114 (3099) (3048) (1524) (1524) (838) (2559) (413) (210) (279) 12 (305) 9 (229)
Source: DPN001677, Rev. 0 15 (381) 12 (305)
18 (458) 15 (381)
21 (553) 18 (458)
24 (610) 21 (533)

Liebert CW 30
 Liebert CW Dimensions and Weights

3.6 Plenum Dimensions

Figure 26 Plenum dimension, CW026 - CW084 upflow plenums with EC fans

Flanges provided on blower(s) outlet for

supply air ducting when
solid panel plenum is used.
1"
(25mm) 2"
(50.8mm)
D
C
1"
2" (25mm)
(50.8mm) 20"
(508mm)
G

Both top duct openings and

front grilles are shown. See
E specification sheet for specific
B
A application.
F
1" (25mm)
2" D
C
(50.8mm)
2"
(50.8mm)
1"
(25mm)

DPN002385
Rev. 1

Plenum Dimensional Data in (mm) Grille Free

Area Sq. Ft. G
Model A B C D E F (Sq. Meters) Supply Air in (mm)
CW026, CW038, 50 34 46 32 46 2 4.29 Grille & 22.75
CW041 (1270) (864) (1168) (813) (1168) (51) (.40) Top Discharge (578)
74 34 70 32 62 6 5.85 Top Discharge 30
CW051, CW060
(1880) (864) (1778) (813) (1575) (152) (.54) Only (762)
99 34 95 32 70 14-1/2 6.83 Top Discharge 36
CW076, CW084
(2515) (864) (2413) (813) (1778) (368) (.63) Only (914)
Source: DPN002385, Rev. 1

31 Liebert CW
 Liebert CW Dimensions and Weights

Figure 27 Plenum dimensions for upflow models CW026 - CW084 with centrifugal fans
Flanges provided
on blower(s) outlet for
supply air ducting when
1" solid panel plenum is used.
(25mm)
D J
C
1"
2" (25mm)
(50.8mm)
18" (457mm)
H

1"
(25mm)
Both top duct openings and
E front grilles are shown. See
B
A specification sheet for specific
F 1" application.
(25mm)
2" D
(50.8mm) C
2"
(50.8mm)

1" (25mm)
Flange is standard on all units
except downflow models
where it must be
specified if required.

DPN001678
Rev. 1

Plenum Dimensions, in. (mm) Grill Free Plenum Height in. (mm)
Area
Model A B C D E F ft2 (m2) H J
CW026, CW038,
50 (1270) 34 (864) 46 (1168) 32 (813) 44 (1118) 3 (76) 4.29 (.40) 20 (508) 1 (25)
CW041
CW051, CW060 74 (1880) 34 (864) 70 (1778) 32 (813) 60 (1524) 7 (178) 5.85 (.54) 22-3/4 (578) 2-3/8 (60)
CW076, CW084 99 (2515) 34 (864) 95 (2413) 32 (813) 70 (1778) 14-1/2 (368) 6.83 (.63) 34-3/4 (883) 2-3/8 (60)
Source: DPN001678, Rev. 0

Liebert CW 32
 Liebert CW Dimensions and Weights

Figure 28 Plenum dimensions for upflow models CW106 and CW114 with centrifugal fans
Flanges provided
D 1" (25mm)
on blower(s) outlet for L
C
supply air ducting when
solid panel plenum is used.

18" (457mm)
K 1"
(25mm)
Both top duct openings and
H front grilles are shown. See
G J specification sheet for specific
B F E application.
E
A

1" (25mm)
D
2" (50.8mm) C
2" (50.8mm)
1" (25mm)

Flange is standard on all units

except downflow models
where it must be
specified if required.

DPN001679
Rev. 1

Plenum Dimensions, in. (mm) Plenum Height, in.(mm)

Grille Free
Model A B C D E F G H J Area, ft2 (cm2) K L

CW106 122 34 118 32 44 3-1/2 4 7 16 10.14 20 (508) 1 (25)

CW114 (3099) (864) (2997) (813) (1118) (89) (102) (178) (406) (.94) 22-3/4 (578) 2-3/8 (60)
Source: DPN001679, Rev. 0 34-3/4 (883) 2-3/8 (60)

33 Liebert CW
 Liebert CW Dimensions and Weights

Figure 29 Plenum dimensions CW106, CW114 upflow plenums with EC fans

NOTE: Top duct flanges on plenum
top for supply air ducting when
solid panel plenum is used

D
1" (25mm)
1.5"(38mm)
C

20" (508mm)
J 1"
(25mm)

H Both top duct opening

G I and grilles shown.See
B F E spec sheet for specific
E application
A

1" (25mm)
D
C
2" (50.8mm) 2" (50.8mm)

1"(25mm)

DPN002384
Rev. 0

Plenum Dimensions, in. (mm) Grille Free Plenum Height, in. (mm)
Area Sq. Ft.
Model A B C Dt E F G H I (Sq. Meters) Supply Air J
CW106 122 34 118 32 44 3 2 5 18 10.14
Grille/ Top Discharge 22.75 (578)
CW114 (3099) (864) (2997) (813) (1118) (76) (51) (127) (457) (.94)
Source: DPN002384, Rev. 0 Top Discharge Only 30 (762)
Top Discharge Only 36 (914)

Liebert CW 34
 Liebert CW Dimensions and Weights

Figure 30 Filter plenum dimensions, downflow models CW146 and CW181 with EC fans

117-11/16"
(2989mm) Opening

42"
(1067mm)
Opening
3/4"
(20mm)
Bezels

45" 18"
(1143mm) (457mm)
Plenum Filter Plenum

94"
(2388mm)
Total Height

76"
(1930mm
Base Unit

120" (3044mm)
1-1/2"
122" (3099mm)
(38mm)
45" 1"
(1143mm) (25mm)
47" typ
(1194mm)
Filters are removed Filter Plenum
through the front (Shipped Separately)
of the plenum

CW146 or
CW181 base unit

48"
(1219mm)

Striated area indicates

recommended minimum 24"
clearance for component (610mm)
access

Shaded area indicates the minimum clearance

below the unit to lower the fans into the floor. Fans may DPN001707
remain in their shipped position. Rev. 2

35 Liebert CW
 Equipment Inspection and Handling

4.0 EQUIPMENT INSPECTION AND HANDLING

Upon arrival of the unit and before unpacking it, verify that the labeled equipment matches the bill of
lading. Carefully inspect all items for damage, either visible or concealed. For initial access use a
7/32" Allen wrench for panel removal. Damage should be immediately reported to the carrier and a
damage claim filed with a copy sent to Emerson Network Power or to your sales representative.

4.1 Packaging MaterialAll Models

All material used to package this unit is recyclable. Please save for future use or
dispose of the material appropriately.
R
SAFETY INFORMATION

! WARNING
Risk of top-heavy unit falling over. Can cause equipment damage, injury or death.
Read all of the following instructions before attempting to move the unit, lift it, remove
packaging or prepare the unit for installation.

! WARNING
Risk of improper moving. Unit can tip over and cause equipment damage, injury or death.
Use only lifting equipment that is rated for the unit weight by an OSHA-certified rating
organization. Unit shipping weights are listed in Table 2 of this manual.
Use the center of gravity indicators (see Figure 35) on the unit to determine the position of
the slings. The center of gravity varies depending on the unit size and selected options.
The slings must be equally spaced on either side of the center of gravity indicator.

! CAUTION
Risk of sharp edges, splinters and exposed fasteners. Can cause injury.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should attempt to move the unit, lift it, remove packaging or prepare the
unit for installation.

NOTICE
Risk of overhead interference. Can cause unit and/or building damage.
The unit may be too tall to fit through a doorway while on the skid. Measure the unit and
doorway heights and refer to the installation plans to verify clearances prior to moving the
unit.

NOTICE
Risk of forklift running into the unit. Can cause unit damage.
Keep the tines of the forklift level and at a height to fit below the skid and unit to prevent
damage.

NOTICE
Risk of improper storage. Can cause unit damage.
Keep the Liebert CW upright, indoors and protected from dampness, freezing temperatures
and contact damage.

Liebert CW 36
 Equipment Inspection and Handling

Figure 31 Equipment recommended for handling the Liebert CW

Forklift Pallet Spreader Bars and Slings

Jack Piano Jacks
If possible, transport the Liebert CW with a forklift or pallet jacks. If that is not possible, use a crane
with slings and spreader bars.
If using a forklift or pallet jack, make sure that the forks (if adjustable) are spread to the widest
distance that will fit under the skid.
Ensure the fork length is suitable for the unit length.
When moving the packaged Liebert CW with a forklift, lift the unit from either end of the skid
that has the indicated labeling no higher than 4" (102mm) off the floor. Ensure that the opposite
end still touches the floor.
The unit is to be pulled by the forkliftIf the unit must be lifted higher than 4" (102mm) great
care must be exercised: Personnel who are not directly involved in moving the unit must be kept
20' (5m) or farther from the lift point of the unit.
Always refer to the location of the center of gravity indicators when lifting the Liebert CW (see
Figure 35).

4.2 Unpacking the Unit

Remove outer packaging when ready to install the unit.
1. Remove the exterior stretch wrap packaging material from the unit, exposing the protective
corner and side packaging planks.
2. Remove the corner and side packaging planks from the unit, exposing the bag over the unit.
3. Remove the bag from the unit when ready to remove the skid and install the unit.

Figure 32 Removing packaging

Step 1 Step 2 Step 3

196713
Rev. 0

37 Liebert CW
 Equipment Inspection and Handling

4.2.1 Removing the Unit from the Skid With a Forklift

1. Align a forklift with either the front or rear side of the unit (see Figure 33).

! WARNING
Risk of improper moving. Unit can tip over and cause equipment damage, injury or death.
Use the center of gravity indicators on the unit to determine the entry points for the tines (see
Figure 35). The center of gravity varies depending on the unit size and selected options.
The forklifts tines must be equally spaced on either side of the center of gravity indicator. The
forklifts tines must be locked to the widest possible spread that will fit under the unit.
2. Insert the tines of the forklift completely under the base of the Liebert CW.

! WARNING
Risk of improper moving. Unit can tip over and cause equipment damage, injury or death.
Ensure that the tines are levelnot angled up or down.
The tines must be at a height that will allow proper clearance under the unit.
Ensure that the tines extend beyond the opposite side of the unit.
3. Remove the brackets holding the Liebert CW to the skid.
4. Lift the unit off the skidno more than 4" (1052mm)and remove the skid.

Figure 33 Remove the unit from the skid

Step 1
Step 2

Step 3

Step 4

196713
Rev. 0

Liebert CW 38
 Equipment Inspection and Handling

4.2.2 Moving the Unit to the Installation Location with Piano Jacks
1. With the Liebert CW elevated, position piano jacks at each end of the unit (see Figure 34).
2. Lower the unit to a height suitable for the piano jacks and place protective material between the
Liebert CW and the piano jacks.
3. Secure the unit to the piano jacks and remove the forklift.
4. Use the piano jacks to move the unit for installation. At least two people are required to move the
Liebert CW with the piano jacks.
Figure 34 Moving the unit to its installation location

Step 1 Step 2

Step 3

196713
Rev. 0

4.2.3 Removing Piano Jacks

1. Lower the unit as much as the piano jacks will allow.
2. Undo all strapping holding the piano jacks to the unit.
3. Use a pry bar or similar device to lift one end of the unit just enough to allow removal of the piano
jack from that end.
4. Repeat Step 3 to remove the piano jack on the opposite end.
5. Remove all material that might have been used to protect the unit from the piano jacks and
strapping.

39 Liebert CW
 Equipment Inspection and Handling

4.2.4 Removing Liebert CW from Skid Using Rigging

! WARNING
Risk of top heavy unit tipping over. Can cause equipment damage, injury or death.
Use only lifting equipment that is rated for the unit weight by an OSHA-certified rating
organization. Unit shipping weights are listed in Table 2 of this manual.
Use the center of gravity indicators (see Figure 35) on the unit to determine the position of
the slings. The center of gravity varies depending on the unit size and selected options.
The slings must be equally spaced on either side of the center of gravity indicator.
1. Locate the center of gravity indicatorthe center of gravity varies according to a units size and
options.
2. Space the slings equidistant on either side of the center of gravity indicator (see Figure 35).
Figure 35 Locate center of gravity marker and place slings

Slings Equidistant
from Each Side of
Indicator
Illustration shows
rigging for one possible
center of gravity on the
Liebert CW. The center of
gravity varies with the
models options and size.

Center
of Gravity
Indicator

Equal Equal 196713

Space Space Rev.0
3. Place the slings between the bottom rails of the Liebert CW and the top of the skid.

NOTE
Unit is shown without packaging. These instructions may be applied with or without the outer
packaging in place, with the panels attached or with the panels removed.
4. Use spreader bars or a similar device and padding to ensure the Liebert CW will not be damaged
when the unit is lifted (see Figure 35). Lifting will force the slings toward the Liebert CW and
the slings may damage the unit unless it is properly protected.
5. Move the Liebert CW to its installation location.
6. Remove the brackets securing the Liebert CW to the shipping skid.

NOTE
Depending on final installation location, the skid may need to remain under the unit.
Therefore, the lag bolts and brackets would not yet be removed.
7. Lift the Liebert CW off the skid.
8. Move the skid from under the unit.
9. If the unit is at its installation location, lower it to the floor and remove the slings and spreader bars.
If the Liebert CW must be moved, refer to 4.2.2 - Moving the Unit to the Installation
Location with Piano Jacks.

Liebert CW 40
 Equipment Inspection and Handling

Figure 36 Using rigging to lift Liebert CW off skidModels CW026-CW181

196713
Rev. 0

41 Liebert CW
 EC Fans

5.0 EC FANS
5.1 Lowering and Removing EC FansDownflow Units Only
Liebert CW downflow models can be equipped with EC fans that can be operated either in their fully
raised position or lowered into the floor stand for increased efficiency from reduced air resistance.
The fans are also removable, easing maintenance and replacement.

! WARNING
Risk of very heavy 145 lb. (65.7kg) fan modules dropping downward suddenly. Can cause
injury or death. Support fan modules before removing mounting hardware.
Use caution to keep body parts out of the fan modules pathway during repositioning.
Only properly trained and qualified personnel should work on this equipment.

! CAUTION
Risk of handling heavy and lengthy parts. Can cause personal injury and equipment damage.
Cabinet panels can exceed 5ft. (1.5m) in length and weigh more than 35lb. (15.9kg). Follow
relevant OSHA lifting recommendations and consider using a two-person lift for safe and
comfortable removal and installation of cabinet panels. Only properly trained and qualified
personnel wearing appropriate safety headgear, gloves and shoes should attempt to remove or
install cabinet panels.

NOTE
The Liebert CW unit should be used with the fans either in their original raised position or
with the fans in their fully lowered position. Suspension of fans in an intermediate position
will directly affect product performance and is not recommended.

5.1.1 Lowering the EC Fans into the Floor Stand

1. Remove the middle and bottom panels from the front of the unit.
2. For ease of fan lowering, Emerson recommends removing the infrared humidifier using the
approved infrared humidifier removal procedure.
3. Position the factory-supplied jack and jack support under the fan to be lowered.
4. Raise the jack to safely support the fan before removing any hardware.
NOTE
A properly positioned jack will be centered between the first and second set of tabs on the jack
support. The jack will be biased toward the front of the unit.
5. For Liebert CW models CW089-CW114, remove the two guide rails and store them; they will be
needed if the fan module is removed.
6. Cut and remove the cable tie that retains the wiring loop to the blower mounting plate. All other
cable ties that route the fan wiring should remain intact.
7. Remove the six 1/2" hex head screws, and, on CW026-CW114 models, remove the Z bracket(s)
using the socket wrench. Retain the hardware for later steps.
8. Using the jack, slowly lower the fan module until it rests on the frame of the unit.

NOTICE
Risk of equipment snagging cables and wiring. Can cause unit damage.
Monitor the position of the fan harnesses and other parts while lowering the fan to be sure
that they are not caught or pinched.
9. CW026, CW038, CW041, CW076 through CW114 Models: Secure the fan module in the fully
lowered position by re-installing the Z bracket(s), using the retained hex-head screws.
For CW051 and CW060 models, the fan module is secured to the center frame support. The Z
brackets will be used to secure the fan at the outer attachment point.
CW146 and CW181 models: Use the hex head screws removed in Step 7 to secure the fan
module directly to the frame. screw clearance holes are provided in the fan module
NOTE
Not all hardware retained will be used to secure the fans in the lowered positioned.

Liebert CW 42
 EC Fans

Figure 37 EC fan lowering procedure

2
TABS
1

3 A
DETAIL A Section
Jack Location Not Shown
B B
Fan Deck

"Z" Bracket
Section Location On
Not Shown CW026 - CW060
3

5
5

"Z" Bracket
Location On
"Z" Bracket 4 CW076 - CW114
Section B-B Wiring Loop
TOP VIEW OF FAN DECK
DPN002037
Page 1, Rev. 5

See Step 55

DPN001625
Pg. 1, Rev. 3

43 Liebert CW
 EC Fans

5.1.2 EC Fan Block-Off Panel KitOptional

The EC Fan Block-Off Panel Kit eliminates bypass airflow when EC fan are operated in the lowered
position. Refer to Figure 38 for installation.

Figure 38 EC fan block-off panel kit- add data from DPN002037 need to add operation in up position

Fasteners

Block-Off
Panel Application:
For units utilizing optional block-off kit
with fans operated in the Up position
(fans in unit).
Refer to block-off panel kit installation
instructions 301271p1 for detailed
Installation procedure.
Note: The fans must be operated in either
DPN002037 the fully raised position or fully lowered
Pg. 3, Rev. 5 position. No other fan positioning is supported.
5.1.3 Removing EC FansDownflow Units Only
The EC fans in Liebert CW units can be removed for easier maintenance or for replacement.

! WARNING
Risk of very heavy 145 lb. (65.7kg) fan modules dropping downward suddenly. Can cause
injury or death. Support fan modules before removing mounting hardware.
Use caution to keep body parts out of the fan modules pathway during repositioning.
Only properly trained and qualified personnel should work on this equipment.
NOTE
The Liebert CW unit should be used with the fans either in their original raised position or
with the fans in their fully lowered position. Suspension of fans in an intermediate position
will directly affect product performance and is not recommended.

Liebert CW 44
 EC Fans

If the fan to be removed has been lowered into the floor stand, first raise the fan; if the fans are
already in the raised position, skip to Step 6. To raise a lowered fan:
1. Remove the middle and bottom panels from the front of the unit.
2. Remove the infrared humidifier to ease fan removal.
3. Remove any securing hardware and position the jack support and jack supplied with the unit
under the fan module. A properly positioned jack will be biased toward the front of the fan motor.
4. Use the jack to raise the fan module slowly out of the floor stand and into the unit.

NOTICE
Risk of equipment snagging cables and wiring. Can cause unit damage.
Monitor the position of the fan harnesses and other parts while raising the fan to be sure that
they are not caught or pinched while the fan is being raised.
5. CW089, CW106 and CW114 models: Insert the two fan guide rails supplied with the unit or
equivalent, field-supplied device into position. The rails can be installed by latching onto the
channel in the back of the unit and secured with one #8-18 x 1/2" self-threading screw in the front
channel hole provided.
CW146 and CW181 models will need to utilize a field-supplied device in place of the fan guide
rails.
6. On CW026 - CW114 models, wiring is in the rear. Unplug the power connectors to the fan
module and constrain the harness out of the way. Remove the protective shields by removing
hardware.
The CW146 and CW181 models wiring is in the front of the unit and does not have connectors.
The harness must be unconnected from the motor overloads in the electric panel and removed
with the fan module.
7. Remove the front vertical supports as needed to remove the fan module.
8. Using the rails, slide the blower out through the front of the unit. Reverse directions to reinstall
replacement fan module.

45 Liebert CW
 EC Fans

Figure 39 EC fan lowering and removal procedure

See Steps 1 and 2 See Step 3

6
6
8

See Steps 4 - 7 See Step 8

Liebert CW 46
 EC Fans

5.2 Installing Upflow EC Fan Plenums

Liebert CW upflow models CW026 to CW114 may be ordered with optional EC fans instead of upflow
centrifugal fans. EC fans must be installed in a separate plenum.The installation instructions for
these units is contained in the fan module, which is shipped separately from the main unit. Follow all
instructions to reduce the risk of damage to property, personnel and equipment.
Installation instructions begin at 5.2.2 - Upflow Plenum and EC Fan Preparation

! WARNING
Risk of electrical shock. Can cause injury or death. Disconnect all local and remote electric
power supplies before working within.
Risk of mishandling heavy fan assembly(s) and plenum. Can cause equipment damage,
injury, or death. Attach the fan assembly(s) and plenum to the unit only as described in these
instructions.

! CAUTION
Risk of sharp edges and heavy parts. Can cause injury and equipment damage.
A minimum of two properly trained and qualified personnel are required to install the fan
assembly(s) and plenum.
Wear OSHA approved safety headgear, gloves, shoes, and glasses when installing the fan
assembly(s) and plenum.
Equipment used in handling/lifting, and/or installing the fan assembly(s) and plenum must
meet OSHA requirements. Use handling/lifting equipment rated for the weight of the fan
assembly(s) and plenum. Use ladders rated for the weight of the fan assembly(s) and plenum
and technicians if used during installation.
Refer to handling/lifting, and/or installation equipment operating manual for manufacturer's
safety requirements and operating procedures.
Refer to Figure 3 for plenum weight, table 2 for fan assembly weight.
Table 3 Liebert CW upflow plenum with EC fan assembly(s) configurations
Plenum Height 24" (610 mm) 30" (762 mm) 36" (917 mm)
Unit Description Assembly Number and Weight
CW106-114 Unit Length 122" (3099mm)
Non-grilled plenum 305211G1 - 150lb. (68kg) 305211G2 - 181lb. (82kg) 305211G3 - 207lb. (94kg)
Front discharge 306584G1 - 281lb. (127kg)
Rear discharge 305468G1 - 281lb. (127kg)
CW076-084 Unit Length 99" (2515mm)
Non-grilled plenum 306085G1 - 124lb. (56kg) 306085G2 - 148lb. (67kg) 306085G3 - 168lb. (76kg)
Front discharge 306585G1 - 221lb. (100kg)
Rear discharge 306082G1 - 221lb. (100kg)
CW051-060 Unit Length 74" (1880mm)
Non-grilled plenum 306205G1 - 99lb. (45kg) 306205G2 - 119lb. (54kg) 306205G3 - 137lb. (62kg)
Front discharge 306586G1 - 159lb. (72kg)
Rear discharge 306204G1 - 159lb. (72kg)
CW026-041 Unit Length 50" (1270mm)
Non-grilled plenum 306194G1 - 75lb. (34kg) 306194G2 - 91lb. (41kg) 306194G3 - 104lb. (47kg)
Front discharge 306587G1 - 130lbs. (59kg)
Rear discharge 306193G1 - 130lbs. (59kg)

47 Liebert CW
 EC Fans

Table 4 Liebert CW Upflow EC fan assembly weight

Assembly Number and Weight Voltage
306943G1 - 102lb. (46kg) 480V
306943G2 - 102lb. (46kg) 208V

5.2.1 Liebert CW Upflow Plenum Assembly Parts

Refer to Figures 40 through 48. Not all parts are used for all models.)
Table 5 Key to Liebert CW Upflow plenum assembly parts
Item Description Quantity
1 Side Panel 2
2 Front Solid Panel 1
3 Front Grilled Panel 1
4 Short Front Solid Panel 1
5 Short Front Grilled Panel 1
6 Short Rear Solid Panel 1
7 Short Rear Grilled Panel 1
8 Front / Rear Solid Panel 1
9 Rear Grilled Panel 1
10 Angle Top Rear 1
11 Channel Panel 1 or 2
12 Panel Mounting Bracket (double panel) 1
13 Top Frame 1
14 Top Frame Extension 1
15 Top Frame Angle Brace 1
16 Top Panel (with holes) 1
17 Top Panel (plain) 1
18 Plenum Brace 1
19 Panel Mounting Bracket (single panel) 1
20 Washer
21 Bolt Varies
Depending
22 Channel Frame on Assembly
23 Sheet Metal Screw

Liebert CW 48
 EC Fans

Figure 40 Non-grilled plenum122" (3099mm) unit length

10 KEY TO COMPONENTS
6
1 - Side Panel
Refer to Table 5 for key 1 2 - Front Solid Panel
to component locations. 4 - Short Front Solid
Panel
6 - Short Rear Solid Panel
8 8 - Front / Rear Solid
14 Panel
10 - Angle Top Rear
11 11 - Channel Panel
12 - Panel Mounting
Bracket (double
18 20 21 panel)
13 - Top Frame
14 - Top Frame Extension
13
15 15 - Top Frame Angle
Brace
22 22 4 18 - Plenum Brace
20 - Washer
21 - Bolt
22 - Channel Frame
12
2 20 21
1
20
19 21
20 21

Figure 41 Grilled plenum, front discharge122" (3099mm) unit length

Refer to Table 5 for key to component locations.

16
17 KEY TO COMPONENTS
1 - Side Panel
3 - Front Grilled Panel
5 - Short Front Grilled Panel
6 - Short Rear Solid Panel
8 - Front / Rear Solid Panel
11 - Channel Panel
6 1 16 - Top Panel (with holes)
17 - Top Panel (plain)

11

11

49 Liebert CW
 EC Fans

Figure 42 Grilled plenum, rear discharge122" (3099mm) unit length

Refer to Table 5 for key
to component locations. KEY TO COMPONENTS
17
1 - Side Panel
16 2 - Front Solid Panel
4 - Short Front Solid Panel
7 - Short Rear Grilled Panel
9 - Rear Grilled Panel
11 - Channel Panel
12 - Panel Mounting Bracket
7 1 (double panel)
13 - Top Frame
14 - Top Frame Extension
15 - Top Frame Angle Brace
16 - Top Panel (with holes)
14 17 - Top Panel (plain)
19 - Panel Mounting Bracket
11 (single panel)
9 20 - Washer
21 - Bolt
20 21 22 - Channel Frame
13

15 22
4
22
12

20
2 21
1
20 21 19 20 21

Figure 43 Non-grilled plenum99" (2515mm) unit length

18 1 KEY TO COMPONENTS
Refer to Table 5 for key 1 - Side Panel
to component locations. 2 - Front Solid Panel
13 8 - Front / Rear Solid Panel
13 - Top Frame
18 - Plenum Brace
8 19 - Panel Mounting Bracket
(single panel)
20 - Washer
21 - Bolt
22 - Channel Frame

20 21 22

1
20
19 21

Liebert CW 50
 EC Fans

Figure 44 Grilled plenum, front discharge99" (2515mm) unit length

KEY TO COMPONENTS
17 1 - Side Panel
Refer to Table 5 for key 3 - Front Grilled Panel
to component locations. 8 - Front / Rear Solid Panel
16 - Top Panel (with holes)
17 - Top Panel (plain)
16

Figure 45 Grilled plenum, rear discharge99" (2515mm) unit length

Refer to Table 5 for key
to component locations. KEY TO COMPONENTS
17 1 - Side Panel
2 - Front Solid Panel
9 - Rear Grilled Panel
13 - Top Frame
16 16 - Top Panel (with holes)
17 - Top Panel (plain)
19 - Panel Mounting
Bracket (single panel)
20 - Washer
1 21 - Bolt
22 - Channel Frame

9
13
20 21 22

20
19 21
1

51 Liebert CW
 EC Fans

Figure 46 Non-grilled plenum50", 74" (1270mm, 1880mm) unit length

Refer to Table 5 for key 8 KEY TO COMPONENTS

to component locations. 1 - Side Panel
2 - Front Solid Panel
8 - Front / Rear Solid Panel
13 13 - Top Frame
20 - Washer
21 - Bolt
22 - Channel Frame

20 21 22 Not used on 50" unit

1

Figure 47 Grilled plenum, front discharge50", 74" (1270mm, 1880mm) unit length

16

Refer to Table 5 for key

to component locations.

1
KEY TO COMPONENTS
1 - Side Panel
3 - Front Grilled Panel
8 - Front / Rear Solid Panel
16 - Top Panel (with holes)

Liebert CW 52
 EC Fans

Figure 48 Grilled plenum, rear discharge50", 74" (1270mm, 1880mm) unit length

16
KEY TO COMPONENTS
Refer to Table 5 for key 1 - Side Panel
to component locations. 2 - Front Solid Panel
9 - Rear Grilled Panel
13 - Top Frame
1 16 - Top Panel (with holes)
20 - Washer
21 - Bolt
22 - Channel Frame

13

20 21 22 Not used on 50" unit

1

Figure 49 EC fan assembly

Washer and
Number of fans depends on unit size Bolt
Spacer

EC Fan Assembly Spacer Washer and

Bolt
Spacer
Washer and
Bolt

Spacer
Washer and 306970
Bolt Pg. 9, Rev. 0
Spacer

5.2.2 Upflow Plenum and EC Fan Preparation

Grilled plenums are intended for Liebert CW upflow units only. Non-grilled plenums provide access
for installing and servicing EC fan assembly(s) on upflow units with field-supplied ductwork.
1. Move the Liebert CW to the installation location and remove items from packaging.
2. Verify that the fan motor(s) voltage rating is appropriate for the marked unit voltage rating.
3. Disconnect all local and remote power to the unit.
4. Emerson recommends using a lifting device, such as a duct lift or scissors lift, to assist in
installing the EC fan assembly(s) on top of the Liebert CW unit.

53 Liebert CW
 EC Fans

Figure 50 Recommended tools for installing the upflow plenum and EC fan

For Steps 1 through 3, refer to Figure 40 (for non-grilled plenum) or to Figure 41 (grilled plenum)
(items from Table 5).
1. Attach Items 6 (short front solid panel) and 8 (front/rear solid panel) together using Item 11
(channel panel) and (10) Item 23 (sheet metal screw).
2. Attach (2) Item 1 (side panel) to assembled Items 6 and 8 using (10) Item 23. See Detail A for
placement of Item 23.
3. Attach Item 10 (angle top rear) to assembled Items 6 and 8 using (6) Item 23 (only on non-grilled
plenum).
For Steps 4 through 5, refer to Figure 52; items from Table 5.
4. Attach Items 7 (short rear grilled panel) and 9 (rear grilled panel) together using Item 11
(channel panel) and (10) Item 23 (sheet metal screw).
5. Attach (2) Item 1 (side panel) to assembled Items 7 and 9 using (10) Item 23. See Detail A in
Figure 51 for placement of Item 23.

Liebert CW 54
 EC Fans

Figure 51 Non-grilled plenum / Grilled plenum-front discharge

KEY TO COMPONENTS 1
1 - Side Panel 10 23 23
6 - Short Rear Solid Panel
8 - Front / Rear Solid Panel
10 - Angle Top Rear
11 - Channel Panel
23 - Sheet Metal Screw
6

23 Detail A
11
Detail A
8 Insulation on panel
must be pushed in
to access screw holes.

1 23

Figure 52 Grilled plenum-rear discharge

7 1
KEY TO COMPONENTS 23
1 - Side Panel
7 - Short Rear Grilled Panel
9 - Rear Grilled Panel
11 - Channel Panel
23 - Sheet Metal Screw
23
11 Detail A

Detail A
9 Insulation on panel
must be pushed in
to access screw holes.

1
23

For Steps 6 through 8, refer to Figure 53; items from Table 5.

6. Lift assembled panels from Step 1 or Step 5, and place on top of Liebert CW unit.
7. Make sure all of the assembled panels are snug against the collar flange on top of the Liebert CW
unit.
8. Attach the assembled panels to the collar flange using Item 23 (sheet metal screws).
Emerson recommends using clamps to hold the panels snug to the collar flange while inserting
the screws.

55 Liebert CW
 EC Fans

Figure 53 Plenum placement on top of Liebert CW unit

Detail B

Clamp Reference
(use as many
as needed)

Detail B

For Steps 9 through 11, refer to Figure 54.

9. Place the EC fan assembly onto the lifting device (duct lift shown as one option for lifting the EC
fan assembly).
10. Orient the lifting device so that it is in line with where the EC fan assembly is to be installed.
11. Lift the EC fan assembly to just above the top of Liebert CW unit. Make sure not to damage the
unit panels or the installed plenum panels

Liebert CW 56
 EC Fans

Figure 54 EC fan assembly alignment for placement on top of Liebert CW unit

For Steps 12 through 14, refer to Figure 56; items from Table 5.
12. With the EC fan assembly lifted to clear the top of the Liebert CW unit, one person is to be on
each side of the assembly. It is recommended by Liebert that additional personnel is used to assist
in ladder stabilization.
13. Using the handles, slide the EC fan assembly onto the top of the Liebert CW unit. Slide the
assembly until the mounting holes on the assembly base aligns with the threaded locations on top
of the Liebert CW unit. (Note: the assembly will need to be lifted over the hinge which is along the
top of the Liebert CW unit.)
14. Attach the EC fan assembly using (6) Item 2 (washer), Item 3 (bolt), and Item 4 (spacer).
15. Repeat Steps 9 through 14 for each fan assembly to be installed.

57 Liebert CW
 EC Fans

Figure 55 EC fan assembly placement and attachment on top of Liebert CW unit

Repeat Steps 3 and 4

for each fan assembly
to be installed.

KEY TO COMPONENTS
2 3 2 - Front Solid Panel
2 3 - Front Grilled Panel
3

For Steps 16 through 22, refer to Figure 56.

16. Route wire harnesses from EC fans as indicated.
17. Existing wire ties holding the harnesses to the fan cage may require removal.
18. Black sleeved wire harnesses contain wires for fan control.
19. Gray sleeved wire harnesses contain wires for motor high volt connection.
20. Insert wire harnesses into the indicated openings of the junction boxes. Make sure not to route
the wiring over the handles of the EC fan assembly.
21. Refer to Figures 57 and 58 for wire connections inside the junction box.
22. Use provided wire ties to secure the wire harnesses to the fan cage to prevent the wire harnesses
from moving when the fans are functioning

Liebert CW 58
 EC Fans

Figure 56 EC fan wire routing

See Figure 57 See Figure 58

NOTICE
Risk of pinched wiring. Can cause short circuit and/or loss of power to fans.
Make sure all connected wires are within the junction box prior to closing and securing the
lid.

59 Liebert CW
 EC Fans

Figure 57 Junction box connection (fan 1 and 2 for units with 2 or 3 fans)

Fan
(low-voltage)
Fan
(low-voltage)

BL BL

OR OR

R R

BK BK SHLD
SHLD

Green/Yellow
3 Ground Wire
2
1

3
2 3 3
1

2 2
1 1

Typical Both Fans

Motor HV NOTE: The wire termination torque for the high-volt
Motor HV (high-voltage) terminal blocks is 16-20 in-lb.
(high-voltage)

Liebert CW 60
 EC Fans

Figure 58 Junction box connection (Fan 3 for units with three fans / Fan 1 for single-fan units)

Fan
(Low-Voltage)
SHLD Wire
from Unit Harness

BL

OR

BK

SHLD

Green/Yellow
Ground Wire

3 3
3
2 2 2
1
1 1

The wire termination torque

for the high-voltage terminal
is 16-20 in/lb.

Motor HV
(High-Voltage)

For Steps 23 through 27, refer to Figure 59; items from Table 5)
23. Attach Item 12 (panel mounting bracket) to the Liebert CW unit top. Use (2) Item 20 (washer) and
Item 21 (bolt) for attachment.
24. Attach Item 13 (top frame) to Item 14 (top frame) using Item 15 (top frame angle brace) and (4)
Item 23 (sheet metal screw).
25. Attach Items 22 (channel frame) to assembled Items 13, 14, and 15. Use (2) Item 23 (sheet metal
screw) for each Item 22.
26. Attach assembled Items 13, 14, 15, and 22 through Item 22 to the top of the Liebert CW unit. Use
(1) Item 20 (washer) and Item 21 (bolt) for each Item 22.
27. Attach assembled frame to the side panels of the plenum. Use (2) Item 23 (sheet metal screw) for
each side panel attachment.

61 Liebert CW
 EC Fans

Figure 59 Front frame members for non-grilled and grilled rear-discharge plenum

13 141523

KEY TO COMPONENTS
12 - Panel Mounting Bracket
(double panel)
20 - Washer
21 - Bolt

20
12 21

21
20 22

21
20 22

28. Attach Item 3 (front grilled panel) and Item 5 (short front grilled panel) together using Item 11
(channel panel) and (10) Item 23 (sheet metal screw). Refer to Figure 60; items from Table 5.
29. Attach assembled Items 3 and 5 to previously placed plenum side panels. Use (10) Item 23 (sheet
metal screw), (5) per side. Refer to Figure 60; items from Table 5.
30. Attach Item 2 (front solid panel) and Item 4 (short front solid panel) to previously placed front
frame using dzus fasteners installed in Item 2 and 4. Refer to Figure 61; items from Table 5.

Liebert CW 62
 EC Fans

Figure 60 Grilled front-discharge plenum grille attachment

KEY TO COMPONENTS
3 - Front Grilled Panel
5 - Short Front Grilled Panel
11 - Channel Panel
23 - Sheet Metal Screw 11
23

5
23

3
23

Figure 61 Non-grilled and grilled rear-discharge plenum front panel attachment

KEY TO COMPONENTS
2 - Front Solid Panel 4
4 - Short Front Solid Panel

31. Attach Item 16 (top panel w/holes) and item 17 (top panel plain) to the top of previously placed
plenum panels. Use (39) Item 23 (sheet metal screw). Refer to Figure 62; items from Table 5.

63 Liebert CW
 EC Fans

Figure 62 Grilled plenum front / rear-discharge top panel attachment

17
KEY TO COMPONENTS
23
17 - Top Panel (plain)
23 - Sheet Metal Screw

16 23

Liebert CW 64
 Electrical Connections

6.0 ELECTRICAL CONNECTIONS

6.1 Electrical Connections

Three-phase electrical service is required for all models. Electrical service must conform to national
and local electrical codes. Refer to equipment nameplate regarding wire size and circuit protection
requirements. Refer to electrical schematic when making connections. Refer to Figures 63
through 73 for electrical service entrances into unit.
A manual electrical disconnect switch should be installed in accordance with local codes and
distribution system. Consult local codes for external disconnect requirements.

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect local and remote power supplies
before working within.
Use voltmeter to make sure power is turned off before making any electrical connections.
Before proceeding with installation, read all instructions, verify that all the parts are included
and check the nameplate to be sure the voltage matches available utility power.
50Hz Models Only: Reinstall all terminal covers before connecting power to the unit. Failure
to install these covers exposes high-voltage terminals.
Follow all local codes.

! WARNING
Risk of improper wiring, piping, moving, lifting and handling. Can cause equipment damage,
injury or death.
Installation and service of this equipment should be done only by personnel who have been
properly trained and qualified in the installation of air conditioning equipment

! WARNING
Risk of overheated electrical connection terminals. Can cause equipment damage, smoke and
activation of smoke alarm and fire suppression system that can lead to injuries or death from
building evacuation accidents.
Use copper wiring only. Make sure that all connections are tight.

NOTICE
Risk of improper electrical supply connection. Can cause equipment damage.
See the transformer label for primary tap connections. The installer must change the
transformer primary taps if the applied unit voltage is other than the pre-wired tap voltage.

65 Liebert CW
 Electrical Connections

Figure 63 Electrical field connections for downflow models CW026 - CW084

Field-supplied disconnect switch when factory-installed

unit disconnect switch is not provided. Select per national
and local codes.
Factory-installed unit disconnect switch (optional)

Monitoring Panel

Three-phase connection (50Hz). Electric service

connection terminals when factory disconnect
switch is NOT supplied

Earth ground connection (60Hz).

Connection terminal for field-supplied
earth grounding wire.
Three-phase electric service Earth ground bar (on 50Hz only).
not by Emerson. Connection terminals with factory ground
from each high-voltage component for
field-supplied earth grounding wire.
Main fuse block and fuses not
2 3
present when fused disconnect installed
Three-phase connection. Electric or on 50Hz units
service connection terminals when Three-phase connection (60Hz). Electric service
factory disconnect switch is supplied. connection point when factory disconnect
Factory-installed disconnect switch (optional). switch is NOT supplied
May be fused disconnect with internal fuses. Liebert IntelliSlot Housings. Optional monitoring and
communication cards inserted here.
Special alarm connections. Field-supplied
Three-phase electric service not by Emerson 24V. Class 2 wire for special alarms.

Electric conduit knockouts on bottom of

electric box. Knockouts sizes 1-3/8" (35mm)
or 1-3/4" (45mm) or 2-1/2" (64mm)
Electric handy box factory-installed with cover
Common alarm connection. Field-supplied 24V
Class 2 wiring to common alarm Pigtails 75 + 76,
which are factory-connected to common alarm
relay (R3).
Remote unit shutdown. Replace existing
jumper between Terminals 37 + 38
Three-phase connection.
with normally closed switch having a
Electric service connection
minimum 50VA rating. Use field-supplied
terminals when factory-fused
24V Class 2 wire.
disconnect switch is supplied Fused Disconnect View
Smoke detector alarm connections. Field-supplied 24V. NOTE: Refer to specification sheet for
Class 2 wire to remote alarm circuits. Factory-wired DPN001670
full load amp. and wire size amp. ratings.
terminals from optional smoke detector are #91-comm., Pg. 1, Rev. 3
#92-NO, and #93-NC.

Liebert CW 66
 Electrical Connections

Figure 64 Electrical field connections (Ethernet) for downflow models CW026 - CW084
Low-Voltage Communication Wiring
CAT5E Ethernet connections field-installed.
Avoid routing near high-voltage wiring.
Secure wiring to prevent damage and
use bushing or edge guard to avoid sharp edges.

Monitoring
Panel

3
3

Remove knockouts Top Entrance

to access control board
Crossover
Coupler

1. When large display is used, both cables (P64 and P66)

are required.
2. On units with the standard, Small Graphic Display,
the customer connection point for unit-to-unit (U2U)
networking is to P64 on the I/O board.
3. On units with the optional Large Graphic Display, a
crossover coupler is provided for unit-to-unit (U2U) To display
networking. Unplug the red cable from P64 on the I/O
board and connect to one side of the crossover
coupler. The first customer connection point is to
P64 on the I/O board. The second customer
connection point is to the other side of the
crossover coupler. This connects the I/O board and
display to the private U2U network Electric Box Bottom

Coil Support Frame

P64

Remove
Knockouts

Unit Bottom
Refer to specification sheet for full load
amp and wire size amp ratings. Bottom Entrance

DPN001670
Pg. 2, Rev. 3

67 Liebert CW
 Electrical Connections

Figure 65 Electrical field connections for downflow models CW089, CW106 and CW114
Monitoring
Panel

Field-supplied disconnect switch

when factory-installed unit
disconnect switch is not provided.
Select per national and local codes

Three-phase electric service

not by Emerson.

Factory-installed unit
disconnect switch (optional)

Three-phase connection (50Hz). Electric

service connection terminals when
factory disconnect switch is NOT supplied.

Earth ground connection (60 Hz).

Connection terminal for field-supplied
earth grounding wire
Disconnect switch (optional). Factory-installed
Three-phase connection (60Hz). Electric
service connection terminals when Main fuseblock and fuses not present when fused
factory disconnect switch is NOT supplied. disconnect installed or on 50Hz units.

Common alarm connection. Field-supplied 24V. Class 1

Earth ground bar (60Hz). Connection
wiring to common alarm Terminals 75 + 76, which
terminals with factory ground
are factory-connected to common alarm relay (R3).
from each high-voltage component for
field-supplied earth grounding wire. Smoke detector alarm connections
May be fused Field-supplied 24V, Class 1 wire to
disconnect with remote alarm circuits. Factory-wired
internal fuses terminals from optional smoke detector
are #91-comm., #92-NO, and #93-NC
Three-phase connection. Electric
service connection terminals when Customer alarm connections.
factory disconnect switch is supplied. Field-supplied 24V, Class 1 wire
Liebert IntelliSlot
for customer alarm Terminals 24,
Housings.
50, 51, 55, 56.
Optional monitoring
Three-phase electric service and Remote unit shutdown. Replace
not by Emerson. communication cards existing jumper between Terminals
inserted here. 37 + 38 with normally closed switch
having a minimum 50VA rating. Use
field-supplied 24V Class 1 wire.

Three-phase connection. Electric

service connection terminals when
factory-fused disconnect switch
is supplied.

Liebert IntelliSlot
Electric conduit knockouts Power Supply Board
on bottom of wire raceway. Temperature and
Knockout sizes 1-3/8" Humidity Sensor
Fused disconnect view (35mm) or 1-3/4" (45mm)
or 2-1/2" (64mm)
DPN001671
NOTE: Refer to specification sheet for full load amp and wire size amp ratings Pg. 1, Rev. 6

Liebert CW 68
 Electrical Connections

Figure 66 Electrical field connections (Ethernet) for downflow models CW089, CW106 and CW114

Low-Voltage Communication Monitoring

Wiring CAT5E Ethernet connections Panel
field-installed. Avoid routing near
high-voltage wiring. Secure wiring
to prevent damage and
use bushing or edge guard
to avoid sharp edges.
Top Entrance
3
3

Remove knockouts
to access control board

Crossover 1. When large display is used, both cables (P64 and P66)
Coupler are required.
2. On units with the standard, Small Graphic Display,
To display the customer connection point for unit-to-unit (U2U)
networking is to P64 on the I/O board.
3. On units with the optional Large Graphic Display, a
crossover coupler is provided for unit-to-unit (U2U)
networking. Unplug the red cable from P64 on the I/O
Electric Box Bottom board and connect to one side of the crossover
coupler. The first customer connection point is to
P64 on the I/O board. The second customer
Remove knockouts connection point is to the other side of the
to access control board crossover coupler. This connects the I/O board and
display to the private U2U network

Coil Support Frame

P64

Remove
Knockout

Unit Bottom

Bottom Entrance
Refer to specification sheet for full load
amp and wire size amp ratings. DPN001671
Pg. 2, Rev. 6

69 Liebert CW
 Electrical Connections

Figure 67 Electrical field connections (high voltage) for upflow models CW026 - CW084

Field-supplied disconnect switch when factory-installed

unit disconnect switch is not provided

Factory-installed unit disconnect switch (optional).

Monitoring panel

Three-phase connection (50Hz).

Electrical service connection
terminals when factory disconnect
switch is NOT supplied.

Earth ground connection (60Hz).

Three-phase electric service Connection terminal for field-supplied
not by Emerson earth grounding wire.
Main fuseblock and fuses not present
when fused disconnect installed or
on 50Hz units.
2 3 Earth ground bar (on 50Hz only).
Connection terminals with factory ground
Three-phase connection. Electric
from each high voltage component for
service connection terminals when
field-supplied earth grounding wire.
factory disconnect switch is supplied
Three-phase connection (60Hz).
Factory-installed disconnect Electric service connection terminals
switch (optional ). May be fused when factory disconnect switch
disconnect with internal fuses. is NOT supplied.

Three-phase electric service not

by Emerson

Electric conduit knockouts on bottom of

electric box. Knockouts sizes 1-3/8"
(35mm) or 1-3/4" (45mm) or 2-1/2"(64mm).
Three-phase connection.
Electric service connection
terminals when factory-fused
disconnect switch is supplied.

NOTE: Refer to specification sheet for full load amp

and wire size amp ratings DPN001672
Fused disconnect view Rev. 1

Liebert CW 70
 Electrical Connections

Figure 68 Electrical field connections (low voltage) for upflow models CW026 - CW084

Liebert Intellislot Housings.

Underside Optional Monitoring and
of Unit Top Communication cards inserted here

Back of Unit

37 Remote unit shutdown. Replace existing

38
24 jumper between Terminals 37 + 38
50

Factory with normally closed switch

Wiring
91
92
having a minimum 50VA rating. Use
93
51
field-supplied 24V Class 2 wire
55
56

75
76 Smoke detector alarm connections
94
95 Field -supplied 24V. Class 2 wire to
96
97 remote alarm circuits. Factory-wired
terminals from optional smoke detector
are #91-comm., #92-NO, and #93-NC
Special alarm connections. Field-supplied
24V, Class 2 wire for special alarms.
Common Alarm Connections.
Field-supplied 24V. Class 2
Back of wiring to common alarm
Electric Box Terminals 75 + 76, which are
factory connected to common
alarm relay (R3). Optional
NOTE: Refer to specification sheet for full load extra common alarm Terminals
amp. and wire size amp. ratings 94+95 and 96+97 are also
DPN001673 connected to R3 relay
Pg. 1, Rev. 3

71 Liebert CW
 Electrical Connections

Figure 69 Electrical field connections (Ethernet) for upflow models CW026 - CW084
Low-Voltage Communication
Wiring CAT5E Ethernet connections
Monitoring field-installed. Avoid routing near
Panel high-voltage wiring. Secure wiring
to prevent damage and
use bushing or edge guard
to avoid sharp edges.

3
Top Entrance 3

Remove knockouts
to access control board

Crossover Coupler

1. When large display is used, both cables (P64 and P66)

are required.
2. On units with the standard, Small Graphic Display,
the customer connection point for unit-to-unit (U2U)
networking is to P64 on the I/O board.
3. On units with the optional Large Graphic Display, a
crossover coupler is provided for unit-to-unit (U2U)
networking. Unplug the red cable from P64 on the I/O To display
board and connect to one side of the crossover
coupler. The first customer connection point is to
P64 on the I/O board. The second customer Electric Box Bottom
connection point is to the other side of the
crossover coupler. This connects the I/O board and
display to the private U2U network

Coil Support Frame

P64

Remove
Knockouts

Unit Bottom Bottom Entrance

Refer to specification sheet for full load DPN001673
amp and wire size amp ratings.
Pg. 2, Rev. 3

Liebert CW 72
 Electrical Connections

Figure 70 Electrical field connections (Ethernet) for upflow models CW106 and CW114
Low-Voltage Communication
Wiring CAT5E Ethernet connections
Monitoring field-installed. Avoid routing near
Panel high-voltage wiring. Secure wiring
to prevent damage and
use bushing or edge guard
to avoid sharp edges.

3
Top Entrance 3

Remove knockouts
to access control board

Crossover Coupler

1. When large display is used, both cables (P64 and P66)

are required.
2. On units with the standard, Small Graphic Display,
the customer connection point for unit-to-unit (U2U)
networking is to P64 on the I/O board.
3. On units with the optional Large Graphic Display, a
crossover coupler is provided for unit-to-unit (U2U)
networking. Unplug the red cable from P64 on the I/O To display
board and connect to one side of the crossover
coupler. The first customer connection point is to
P64 on the I/O board. The second customer Electric Box Bottom
connection point is to the other side of the
crossover coupler. This connects the I/O board and
display to the private U2U network

Coil Support Frame

P64

Remove
Knockouts

Unit Bottom Bottom Entrance

Refer to specification sheet for full load DPN001673
amp and wire size amp ratings.
Pg. 2, Rev. 3

73 Liebert CW
 Electrical Connections

Figure 71 Electrical field connections (low voltage) for upflow models CW106 and CW114

Monitoring panel

Disconnect
Switch

Knockout for low voltage

wiring connections in
top frame member.
Knockout size 7/8" (22mm)

Remote unit shutdown. Replace

existing jumper between Terminals
37 + 38 with normally closed switch
having a minimum 50VA rating. Use
field-supplied 24V Class 1 wire.
Special alarm connections.
Field -or special alarms
Common alarm connection. Field-
supplied 24V. Class 1 wiring to
common alarm pigtails 75 + 76,
which are factory connected to
common alarm relay (R3).

Smoke detector alarm connections

Field-supplied 24V. Class 1 wire to remote
alarm circuits. Factory-wired
termkinals from optiona smoke detector
are #91-comm., #92-NO and #93-NC
Intellislot Housings.
Optional Monitoring and
Communication cards inserted here.

DPN001675
Rev. 3

Liebert CW 74
 Electrical Connections

Figure 72 Electrical field connections (low voltage Ethernet) upflow models CW106 and CW114
Monitoring
Panel

Disconnect
Switch
1. When large display is used, both cables (P64 and P66)
are required.
2. On units with the standard, Small Graphic Display,
the customer connection point for unit-to-unit (U2U)
networking is to P64 on the I/O Board. Low-Voltage Communication
Wiring CAT5E Ethernet connections
3. On units with the optional Large Graphic Display, a field-installed. Avoid routing near
crossover coupler is provided for unit-to-unit (U2U) high-voltage wiring. Secure wiring
networking. Unplug the red cable from P64 on the I/O to prevent damage and
board and connect to one side of the crossover use bushing or edge guard
coupler. The first customer connection point is to to avoid sharp edges. 3
P64 on the I/O board. The second customer
connection point is to the other side of the
crossover coupler. This connects the I/O board and
display to the private U2U network
3
Top Entrance

Crossover Coupler
Remove knockouts
to access
control board

To display

Electric Box Bottom

P64

Remove knockouts

DPN001675
Pg. 2, Rev. 3
Unit Bottom Bottom Entrance

75 Liebert CW
 Electrical Connections

Figure 73 Electrical field connections for downflow models CW146 and CW181 with EC fans
Fan Transformer Fuses Control
(B) Voltage Only Main Fuses
Cover Plate / Fan T6 Transformer
Reversing Starter Humidifier Fuses Liebert IntelliSlot
Fuses Filter Clog
Location Condensate Power Supply
Pump Fuses Reheat Switch
Power Liebert
Ground Lug 4 Fuses EM1 Relay
Block IntelliSlot
Housings
High
10 Temp
Stat
Humidifier Power Block Large Liebert iCOM
8 Contactor T1 Transformer
A I/O Board
B
Disconnect C
R3 Relay
Backup Terminals for
Reheat Reheat Main Fan D Field Low Voltage
Contactors Contactor Contactor Wiring Connections
Ground CPAR
Main Current Electric Panel Layout Relay Remote Liebert iCOM
3 Fuse Board
1 Fuses Detector 4 50Hz CW 60Hz Humidifier 2
Relay Smoke Detector
Field High Voltage Liebert Liqui-tect Power Supply
Entrance
Note: Typical orientation of components shown. Shutdown
Component location varies by option and unit. Relay
Refer to text on page 76
for description of
15 11 12 18 17 7 numbered items.
19

106 107 110 111 91 92 93 80 81 82 83 A 58 59 84 85 94 95 96 97 75 76 B

6 14 13 16 5

DPN001699
24 50 51 55 56 11 12
C
88 89 37C 38C 37B38B 37 38
D Pg. 3, Rev. 4

Standard Electrical Connections for Downflow Models CW146 and CW181

Refer to Figure 73. Source: DPN001699, Rev. 4.
1. Primary high voltage entrance2-1/2" (64mm); 1-3/4" (44mm); 1-3/8" (35mm) diameter
concentric knockouts in bottom of box.
2. Primary low voltage entranceQuantity (3) 1-1/8" (28mm) diameter knockouts in bottom of
box
3. Three-phase electrical serviceTerminals are on main fuse block (disregard if unit has
optional disconnect switch). Three-phase service not by Emerson.
4. Earth groundTerminal for field-supplied earth grounding wire.
5. Remote unit shutdownReplace existing jumper between Terminals 37 and 38 with
field-supplied normally closed switch having a minimum 75VA, 24VAC rating. Use field-supplied
Class 1 wiring.
6. Customer alarm inputsTerminals for field-supplied, normally open contacts, having a
minimum 75VA, 24VAC rating, between Terminals 24 and 50, 51, 55, 56. Use field-supplied Class
1 wiring. Terminal availability varies by unit options.
7. Common alarmOn any alarm, normally open dry contact is closed across Terminals 75 and 76
for remote indication. 1A, 24VAC maximum load. Use Class 1 field-supplied wiring.

Liebert CW 76
 Electrical Connections

Optional Electrical Connections for Downflow Models CW146 and CW181

Refer to Figure 73. Source: DPN001699, Rev. 4.
8. Unit factory installed disconnect switch, Fuse Block and Main FusesTwo types of
disconnect switches are available Non-Locking and Locking. The Non-Locking Type
consists of a non-automatic molded case switch operational from the outside of the unit.
Access to the high voltage electric panel compartment can be obtained with the switch in either
the On or Off position. The Locking Type is identical, except access to the high voltage electric
panel compartment can be obtained only with the switch in the Off position.
The molded case switch disconnect models contain separate main fuses. Units with fused
disconnect have main fuses within the disconnect.
9. Secondary disconnect switch and earth groundFuses are included in the 65KAIC SCCR
fused disconnect switch models.
10. Three-phase electrical serviceTerminals are on top of disconnect switch. Three-phase
service not by Emerson.
11. Smoke sensor alarmFactory-wired dry contacts from smoke sensor are 91-common, 92-NO,
and 93-NC. Supervised contacts, 80 and 81, open on sensor trouble indication. This smoke sensor
is not intended to function as, or replace, any room smoke detection system that may be required
by local or national codes. 1A, 24VAC maximum load. Use field-supplied Class 1 wiring.
12. Reheat and humidifier lockoutRemote 24VAC required at Terminals 82 and 83 for lockout
of reheat and humidifier.
13. Condensate alarm (with condensate pump option)On pump high water indication,
normally open dry contact is closed across Terminals 88 and 89 for remote indication. 1A, 24VAC
maximum load. Use field-supplied Class 1wiring.
14. Remote humidifierOn any call for humidification, normally open dry contact is closed across
terminals 11 & 12 to signal field supplied remote humidifier. 1A, 24VAC maximum load. Use
Class 1 field-supplied wiring.
15. Reversing Starter Power Supply NotificationNormally open contact Terminals 106 and
107 will close when Power Supply 1 is engaged; 110 and 111 will close when Power Supply 2 is
engaged.

Optional Low Voltage Terminal Package Connections

Refer to Figure 73. Source: DPN001699, Rev. 4.
16. Remote unit shutdownTwo additional contact pairs available for unit shutdown (labeled as
37B and 38B, 37C and 38C). Replace jumpers with field-supplied, normally closed switch having a
minimum 75VA, 24VAC rating. Use field-supplied Class 1 wiring.
17. Common alarmOn any alarm, two additional normally open dry contacts are closed across
Terminals 94 and 95 and 96 and 97 for remote indication. 1A, 24VAC maximum load. Use Class 1,
field-supplied wiring.
18. Main fan auxiliary switchOn closure of main fan contactor, normally open dry contact is
closed across Terminals 84 and 85 for remote indication. 1A, 24VAC maximum load. Use
field-supplied Class 1 wiring.
19. Liebert Liqui-tect shutdown and dry contactOn Liebert Liqui-tect activation, normally
open dry contact is closed across terminals 58 & 59 for remote indication (Liqui-tect sensor
ordered separately). 1A, 24VAC maximum load. Use field-supplied Class 1 wiring.
EC motor and variable frequency drives create current harmonics that will distort the voltage
waveform of their supply and might affect other equipment on the same power source. The degree of
distortion is dependent on the stiffness of the supply power and the total current distortion caused
by all non-linear loads on the system.
The IEEE-519-1992 is the IEEE Recommended Practices and Requirements Guideline for Harmonic
Control in Electrical Power Systems. It defines the maximum voltage distortion limits allowed to be
reflected back onto the utility distribution system. It is a guideline meant to minimize the effects of
electrical pollution created by one utility customer from affecting a different customer. The guideline
requires total voltage harmonic distortion (THD) to not exceed 5% and that the individual current
distortions and total current distortion (TDD) must conform to Table 6. It is NOT a guideline for

77 Liebert CW
 Electrical Connections

individual connected loads, but a guideline for total building or plant. Many apply the voltage
distortion criteria to all substations (maximum 5% THD) and apply the current distortion criteria
exclusively to the utility metering point (PCC).
Table 6 Maximum harmonic current distortion, IEEE-519-1992
Individual Harmonic Limits
I SC / IL < 11 11 h 17 17 h 23 TDD
< 20 4.0 2.0 1.5 5.0
20 < 50 7.0 3.5 2.5 8.0
50 < 100 10.0 4.5 4.0 12.0
100 < 1000 12.0 5.5 5.0 15.0
> 1000 15.0 7.0 6.0 20.0
ISC = Maximum Short circuit current @ PCC.
IL = Total load current @ PCC.
TDD = Total Current Distortion

Typically, if the variable speed fan load is less than 10% of the current capacity at the point of
common coupling (PCC), your installation will meet IEEE-519 guidelines. In this case there should be
no interference issues with other electrical equipment. Typically, the worst-case PCC is the
emergency backup generator plant but could be the transformer that powers the cooling load. If the
PCC is a UPS, consult your UPS supplier for recommendations. For customers who have variable
speed loads that exceed this rule of thumb, it may be necessary to minimize the harmonic impact
these variable speed loads have on the system voltage. In these instances, an undesirable effect is a
difficulty in switching from generator supply to utility supply. The purpose of the Liebert CW THD
mitigating transformer is to cancel current harmonics generated by the EC fan. This device is a
passive device, not a harmonic filter or trap, thus it will not cause unintended harmonic resonance
problems. This device will not improve harmonics caused by other systems on the power network.
The Liebert CW THD mitigation device is an optional feature that can be ordered with the Liebert
Thermal Management unit.
Table 7 shows the Total Current Distortion levels as measured on a single CW114 unit and is typical
of what can be expected in the field on CW106, CW114 and CW146 units.
Table 7 Typical TDD for CW106, CW114 and CW146 at 460V
Event Current Harmonic List 100% Fan Speed
Unfiltered Test Results 3 Blowers Filtered Test Results - Transformer + 3 Blowers
Order (A) (%) Order (A) (%)
1 13.89 100.0% 1 13.00 100.0%
5 3.29 23.7% 5 0.44 3.4%
7 1.94 14.0% 7 0.33 2.5%
11 1.29 9.3% 11 0.13 1.0%
13 0.92 6.6% 13 0.11 0.9%
17 0.79 5.7% 17 0.66 5.1%
Broad Spectrum TDD 31.7% Broad Spectrum TDD 9.1%

Liebert CW 78
 Electrical Connections

Table 7 Typical TDD for CW106, CW114 and CW146 at 460V

Event Harmonic List 60% Fan Speed
Unfiltered Test Results 3 Blowers Filtered Test Results - Transformer + 3 Blowers
Order (A) (%) Order (A) (%)
1 4.77 100.0% 1 4.37 100.0%
5 1.96 41.1% 5 0.38 8.6%
7 1.15 24.2% 7 0.31 7.0%
11 0.34 7.1% 11 0.05 1.2%
13 0.35 7.3% 13 0.05 1.2%
17 0.23 4.9% 17 0.23 5.2%
Broad Spectrum TDD 49.9% Broad Spectrum TDD 14.1%
Table 8 shows the Total Current Distortion level as measured on a single CW181 unit and is typical
of what can be expected in the field on CW181.
Table 8 Typical TDD for CW181 at 460V
Event Current Harmonic List 100% Fan Speed
Unfiltered Test Results 3 Blowers Filtered Test Results - Transformer + 3 Blowers
Order (A) (%) Order (A) (%)
1 13.89 100.0% 1 13.00 100.0%
5 3.29 23.7% 5 0.44 3.4%
7 1.94 14.0% 7 0.33 2.5%
11 1.29 9.3% 11 0.13 1.0%
13 0.92 6.6% 13 0.11 0.9%
17 0.79 5.7% 17 0.66 5.1%
Broad Spectrum TDD 31.7% Broad Spectrum TDD 9.1%
Event Harmonic List 60% Fan Speed
Unfiltered Test Results 3 Blowers Filtered Test Results - Transformer + 3 Blowers
Order (A) (%) Order (A) (%)
1 4.77 100.0% 1 4.37 100.0%
5 1.96 41.1% 5 0.38 8.6%
7 1.15 24.2% 7 0.31 7.0%
11 0.34 7.1% 11 0.05 1.2%
13 0.35 7.3% 13 0.05 1.2%
17 0.23 4.9% 17 0.23 5.2%
Broad Spectrum TDD 49.9% Broad Spectrum TDD 14.1%

79 Liebert CW
 Electrical Connections

Optional Low-Voltage Terminal Package Connections for Downflow Models CW146 and
CW181
Refer to Figure 73.
20. Remote unit shutdownTwo additional contact pairs available for unit shutdown (labeled as
37B & 38B, 37C & 38C). Replace jumpers with field-supplied, normally closed switch that has a
minimum 75VA, 24VAC rating. Use Class 1 field-supplied wiring.
21. Common alarmOn any alarm, two additional normally open dry contacts are closed across
Terminals 94 and 95 and 96 and 97 for remote indication. 1A, 24VAC maximum load. Use Class 1
field-supplied wiring.
22. Main fan auxiliary switchOn closure of main fan contactor, normally open dry contact is
closed across Terminals 84 and 85 for remote indication. 1A, 24VAC maximum load. Use Class 1
field-supplied wiring.
23. Liebert Liqui-tect shutdown and dry contactOn Liebert Liqui-tect activation, normally
open dry contact is closed across Terminals 58 and 59 for remote indication (Liebert Liqui-tect
sensor ordered separately). 1A, 24VAC maximum load. Use Class 1 field-supplied wiring.

NOTE
Refer to specification sheet for total unit full load amps, wire size amps and maximum
overcurrent protective device size.

Liebert CW 80
 Piping

7.0 PIPING
All fluid connections to the unit, with the exceptions of the condensate drain and live steam, are sweat
copper. Factory-installed piping brackets must not be removed. Field-installed piping must be
installed in accordance with local codes and must be properly assembled, supported, isolated and
insulated. Avoid piping runs through noise-sensitive areas, such as office walls and conference rooms.
All piping below the elevated floor must be located so that it offers the least resistance to air flow.
Careful planning of the piping layout under the raised floor is required to prevent the air flow from
being blocked. When installing piping on the subfloor, it is recommended that the pipes be mounted in
a horizontal plane rather than stacked one above the other. Whenever possible, the pipes should be
run parallel to the air flow.
Refer to specific text and detailed diagrams in this manual for other unit-specific piping
requirements.

7.1 Fluid Connections

NOTICE
Risk of clogged or leaking drain lines. Can cause equipment and building damage.
This unit requires a water drain connection. Drain lines must be inspected regularly and
maintenance must be performed to ensure that drain water runs freely through the drain
system and that lines are clear and free of obstructions and in good condition with no visible
sign of damage or leaks. This unit may also require an external water supply to operate.
Improper installation, application and service practices can result in water leakage from the
unit. Water leakage can result in severe property damage and loss of critical data center
equipment.
Do not locate unit directly above any equipment that could sustain water damage.
Emerson recommends installing leak detection equipment for unit and supply lines.

7.1.1 Condensate PipingField-Installed

! CAUTION
Risk of boiling water. Can cause injury.
The unit requires a drain line that may contain boiling water. Only properly trained and
qualified personnel wearing appropriate safety equipment should service the drain line or
work on parts near or connected to the drain line.

Do not reduce drain lines

Do not expose drain line to freezing temperatures
Drain line may contain boiling water. Use copper or other suitable material
Drain line must comply with local building codes
Emerson recommends installing under-floor leak detection equipment

Gravity Drain
3/4" NPT drain connection is provided on units without optional factory-installed condensate
pump
Pitch drain line toward drain a minimum of 1/8" (3mm) per 1 foot (305mm) of length
Drain is trapped internally. Do not trap external to equipment
Drain line must be sized for 2 gpm (7.6 l/m) flow
Drain line must comply with all applicable codes

NOTICE
Risk of improper installation. Can cause unit and/or building damage.
The drain line must not be trapped outside the unit or water may back up in the drain pan
and leak out of the unit on to the building floor(s) below

81 Liebert CW
 Piping

Figure 74 Gravity drain for downflow and upflow units

DOWNFLOW CW UNIT UPFLOW CW UNIT

INTERNAL
DRAIN
UNIT EXTERNAL INTERNAL
DRAIN DRAIN
UNIT

EXTERNAL
DRAIN
CONTINUOUS DOWNWARD SLOPE CONTINUOUS DOWNWARD SLOPE

CORRECT CORRECT

INTERNAL INTERNAL
DRAIN EXTERNAL DRAIN
UNIT
DRAIN
UNIT

EXTERNAL
DRAIN
DO NOT EXTERNALLY DO NOT EXTERNALLY
TRAP THE UNIT TRAP THE UNIT

INCORRECT INCORRECT
INTERNAL
DRAIN INTERNAL
UNIT EXTERNAL
DRAIN
DRAIN
UNIT

EXTERNAL
DRAIN
THESE ARE EXTERNAL TRAPS ALSO, ALTHOUGH THESE ARE EXTERNAL TRAPS ALSO, ALTHOUGH
UNINTENTIONAL. LINES MUST BE RIGID ENOUGH UNINTENTIONAL. LINES MUST BE RIGID ENOUGH
NOT TO BOW OVER TOP OF OTHER OBJECTS. NOT TO BOW OVER TOP OF OTHER OBJECTS.

INCORRECT INCORRECT DPN001556

Rev. 0

Liebert CW 82
 Piping

Condensate Pump
1/2" copper sweat connection is provided on units with optional factory-installed condensate
pump
Condensate Pump (60Hz): Condensate pump is rated for approximately 400 gph at 10 feet total
head
Condensate Pump (50Hz): Condensate pump is rated for approximately 315 gph at 10 feet total
head
Size piping based on available condensate head
Condensate pump discharge (drain) line must comply with all applicable codes

NOTE
For units with a field-installed condensate pump, the unit is shipped from the factory with the
condensate pump option, unmounted in the unit, which must be installed in the field. The unit
has an internally mounted trap. The drain line from the unit to the condensate pump does not
require a trap. The discharge (drain) line from the pump must comply with all applicable
codes.

7.1.2 Humidifier Supply WaterOptional Infrared

1/4" supply line; maximum water pressure is 150 psi (1034kPa)
Size humidifier supply line for 1 gpm (3.8 l/m), with a minimum water pressure of 20 psi (138kPa)
Do not supply de-ionized water to the humidifier

7.1.3 Humidifier Supply WaterOptional Steam Generating Humidifier

Water conductivity of 200-500 micro-siemens required for optimum operation.
1/4" supply line
Leak Checking of Unit and Field Piping
Liebert unit fluid systems are factory-checked for leaks and may be shipped with a nitrogen holding
charge. Liebert unit fluid circuits should be checked for leaks at installation as described below.
NOTE
During leak checking of field-installed piping, Emerson recommends that the unit be isolated
using field-installed shutoff valves. When Liebert CW units are included in a leak test, use of
fluid for pressure testing is recommended. When pressurized gas is used for leak testing a
Liebert CW unit, the maximum recommended pressure is 30 psig (2 bars) and tightness of the
unit should be verified by pressure decay over time, (<2 psig/hour [0.3 bars/hour]) or sensing a
tracer gas with suitable instrumentation. Dry seals in fluid valves and pumps may not hold a
high gas pressure.

83 Liebert CW
 Piping

7.2 Chilled Water Piping

7.2.1 Requirements of Systems Using Water or Glycol
These guidelines apply to the field leak checking and fluid requirements for field piping systems,
including Liebert chilled water, hot water, condenser (water or glycol), GLYCOOL and drycooler
circuits.

General Guidelines
Equipment damage and personal injury can result from improper piping installation, leak check-
ing, fluid chemistry and fluid maintenance.
Follow local piping codes, safety codes.
Properly trained and qualified personnel must install and inspect system piping.
Contact a local water consultant regarding water quality, corrosion protection and freeze protec-
tion requirements.
Install manual shutoff valves at the supply and return line to each indoor unit and drycooler to
permit routine service and emergency isolation of the unit.

NOTICE
Risk of frozen fluids. Can cause equipment damage and building damage.
Freezing system fluids can rupture piping. Complete system drain-down cannot be ensured.
When the field piping or unit may be exposed to freezing temperatures, charge the system
with the proper percentage of glycol and water for the coldest design ambient.
Automotive antifreeze is unacceptable and must NOT be used in any glycol fluid system.

NOTICE
Risk of corrosion. Can cause equipment damage.
Read and follow individual unit installation instructions for precautions regarding fluid
system design, material selection and use of field-provided devices. Liebert systems contain
iron and copper alloys that require appropriate corrosion protection. Contact a local water
consultant regarding water quality, corrosion and freeze protection requirements.
Water chemistry varies greatly by location, as do the required additives, called inhibitors,
that reduce the corrosive effect of the fluids on the piping systems and components. The
chemistry of the water used must be considered, because water from some sources may
contain corrosive elements that reduce the effectiveness of the inhibited formulation.
Preferably, surface waters that are classified as soft and are low in chloride and sulfate ion
content should be employed. Proper inhibitor maintenance must be performed in order to
prevent corrosion of the system. Consult glycol manufacturer for testing and maintenance of
inhibitors.
Commercial ethylene glycol (Union Carbide Ucartherm, Dow Chemical Dowtherm SR-1 and
Texaco E.G. Heat Transfer Fluid 100), when pure, is generally less corrosive to the common
metals of construction than water itself. It will, however, assume the corrosivity of the water
from which it is prepared and may become increasingly corrosive with use if not properly
inhibited.

Liebert CW 84
 Piping

NOTICE
Risk of corrosion. Can cause equipment damage.
Read and follow individual unit installation instructions for precautions regarding fluid
system design, material selection and use of field-provided devices. Liebert systems contain
iron and copper alloys that require appropriate corrosion protection.
Contact a water consultant about water quality, corrosion and freeze protection requirements.
Water chemistry varies greatly by location, as do the required additives, called inhibitors, that
reduce the corrosive effect of the fluids on the piping systems and components. The chemistry
of the water used must be considered, because water from some sources may contain corrosive
elements that reduce the effectiveness of the inhibited formulation. Preferably, surface waters
that are classified as soft and are low in chloride and sulfate ion content should be employed.
Proper inhibitor maintenance must be performed to prevent corrosion of system components.
Consult glycol manufacturer for testing and maintenance of inhibitors.
Commercial ethylene glycol (Union Carbide Ucartherm, Dow Chemical Dowtherm SR-1 and
Texaco E.G. Heat Transfer Fluid 100), when pure, is generally less corrosive to the common
metals of construction than water itself. It will, however, assume the corrosivity of the water from
which it is prepared and may become increasingly corrosive with use if not properly inhibited.
Leak Checking of Unit and Field Piping
Liebert unit fluid systems are factory-checked for leaks and may be shipped with a nitrogen holding
charge. Liebert unit fluid circuits should be checked for leaks at installation as described below.
NOTE
During leak checking of field-installed piping, Emerson recommends that the unit be isolated
using field-installed shutoff valves. When Liebert CW units are included in a leak test, use of
fluid for pressure testing is recommended. When pressurized gas is used for leak testing a
Liebert CW unit, the maximum recommended pressure is 30 psig (2 bars) and tightness of the
unit should be verified by pressure decay over time, (<2 psig/hour [0.3 bars/hour]) or sensing a
tracer gas with suitable instrumentation. Dry seals in fluid valves and pumps may not hold a
high gas pressure.
Manual shutoff valves should be installed at the supply and return lines to each unit. This provides
for routine service and emergency isolation of the unit.
The lowest water temperature to be supplied by the chiller will determine whether insulation is
needed to prevent condensation on the supply and return lines. To prevent water damage to flooring
and subflooring, install a water detection system, such as a Liqui-tect or floor drains with wet traps.

85 Liebert CW
 Piping Schematics

8.0 PIPING SCHEMATICS

Figure 75 Downflow general arrangement, CW026-CW114

Airflow

Bleed
Valve
Chilled Valve
Water Actuator
Return
AB

Chilled A
Water 3-Way
Supply B Chilled Water Coil
Chilled
Water
Ball Valve
Valve
Shutoff *
(Optional)
Valves

Airflow
Flow Switch
Hose* (Optional) 3-WAY VALVE
Bibs Bleed
Valve

Chilled
Water
Valve
Return
Actuator
Chilled Water Coil
Chilled
Water
Supply
2-Way Chilled
Water Valve
Shutoff *
Valves 2-WAY VALVE

Ball Valve
(Optional)
FACTORY PIPING
Hose* FIELD PIPING
Bibs
*Components are not supplied by Emerson but
are recommended for proper circuit operation DPN001657
and maintenance. Rev. 2

Liebert CW 86
 Piping Schematics

Figure 76 Downflow general arrangement, CW181-CW146

Airflow

Ball Valve Valve

(Optional) Actuator

Chilled Water
Return

Chilled Water Coil

Chilled
Water
Supply

Shutoff * 2-Way Chilled

Valves Water Valve

2-WAY VALVE

Airflow
Hose*
Bibs

Chilled Water
Return A
Valve
Actuator AB
Chilled
Water B
Supply
Chilled Water Coil
Shutoff *
Valves A
3-Way
Ball Chilled
AB
Valve Water
(Optional) B
Valve

Hose*
Bibs Flow
Switch 3-WAY VALVE
(Optional)
FACTORY PIPING
FIELD PIPING
*Components are not supplied by Emerson but
are recommended for proper circuit operation DPN001657
and maintenance. Pg. 2, Rev. 2

87 Liebert CW
 Piping Schematics

Figure 77 Primary connection locations, downflow models CW026 - CW041 with EC fans

All Dimensions From

Right Rear Corner of Unit
A A with Panels Assembled
Front View
X
Note: Drawing Not To Scale. Section A-A 0

Tolerance on all piping locating Y

dimensions 1/2" (13mm). 31" (787mm)
Air Discharge
Area

28-1/16" 35"
(714mm) (889mm)
Air Discharge Area
CD
LV
CWP
B

HV
HUM
50" (1270mm)
Front of Unit DPN002036
Rev. 1

Point Description X, in (mm) Y, in (mm) Connection Size / Opening, in (mm)

Condensate Drain * 3/4 (19) FPT
CD 35-1/16 (891) 29-5/16 (745)
W/Optional Condensate Pump ** 1/2 (13) Cu Sweat
HUM Humidifier Supply Line 34-9/16 (878) 31 3/8 (797) 1/4 (6) Cu Sweat
Chilled Water Piping Slot (Center) 43-7/16 (1104) 31-5/8 (803) 9 x 2-1/2 (229 x 64)
CW026: 1-1/8 (29)
CWP
Supply and Return Piping Diameter CW038: 1-3/8 (32)
CW041: 1-5/8 (41)
HV High Volt Electrical Connection 37-7/16 (951) 31-5/8 (803) 2-1/2 (64)
LV Low Volt Electrical Connection 35-7/16 (900) 31-5/8 (803) 7/8 (22)
B Blower Outlet Opening 4 (101) 33 (838) 28-1/16 x 31 (714 x 787)
* Field pitch Condensate Drain line a minimum of 1/8" (3.2 mm) per foot (305 mm). All units contain a factory-installed condensate trap. Do
not trap external to the unit. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply
with all local codes.
** Optional Condensate Pump to be field-installed under unit.
Source: DPN002036, Rev. 1

Liebert CW 88
 Piping Schematics

Figure 78 Primary connection locations, downflow models CW051 and CW060 with EC fans
Note: Drawing Not To Scale.

Tolerance on all piping locating

dimensions 1/2" (13mm).
All Dimensions From
A A Right Rear Corner Of Unit
Front View Including Panels
X
Section A-A 0

Y
31" (787mm)
Typical Air
Discharge Area

24-1/4" 24-1/2" (623mm) 35"

(615mm) Typical Air (889mm)
Air Discharge Discharge Area
CD Area
HV
CWP
B

LV HUM
74" (1880mm)
Front of Unit
DPN002035
Rev. 1

Point Description X, in (mm) Y, in (mm) Connection Size / Opening, in (mm)

Condensate Drain* 3/4 (19) FPT

CD 60-7/8 (1547) 27-3/4 (705)
W/Optional Condensate Pump** 1/2 (13) Cu Sweat
HUM Humidifier Supply Line 59-1/8 (1502) 25-5/8 (727) 1/4 (6) Cu Sweat
Chilled Water Piping Slot (Center) 66-9/16 (1691) 31-1/4 (794) 11 x 3 (279 x 76)
CWP CW051: 1-5/8 (41)
Supply & Return Piping Diameter
CW060: 2-1/8 (54)
HV High Volt Electrical Connection 59 3/8 (1509) 30-3/4 (781) 3 (76)
LV Low Volt Electrical Connection 60-7/8 (1547) 29-1/4 (743) 7/8 (22)
B Blower Outlet Opening 4 (101) 33 (838) 51 x 31 (1295) x 787)
* Field pitch Condensate Drain line a minimum of 1/8" (3.2 mm) per foot (305 mm). All units contain a factory installed condensate trap. Do
not trap external to the unit. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply
with all local codes.
** Optional Condensate Pump to be field installed under unit.
Source: DPN002035, Rev. 1

89 Liebert CW
 Piping Schematics

Figure 79 Primary connection locations, downflow models CW076 - CW084 with EC fans

Note: Drawing not to scale. All Dimensions From

A A
Rear Corner Of Unit
Tolerance on all piping locating Front View Including Panels
dimensions 1/2" (13mm). Section A-A X
0

31" (787mm) 28" (711mm) 35"

Typical Air Discharge Area Typical Air Discharge Area (889mm)
HUM
HV LV
CWP CD
B

99" (2514mm)
Front Of Unit
DPN002034
Rev. 1

Point Description X, in (mm) Y, in (mm) Connection Size / Opening, in (mm)

Condensate Drain * 76-3/8 (1940) 30-7/8 (784) 3/4 (19) FPT
CD
W/Optional Condensate Pump 76-3/8 (1940) 30-7/8 (784) 1/2 (13) Cu Sweat
HUM Humidifier Supply Line 73-7/16 (1865) 31-7/16 (799) 1/4 (6) Cu Sweat
Chilled Water Piping Slot (Center) 91-3/8 (2321) 31-3/8 (797) 101-5/16 x 2-15/16 (277 x 74)
CWP
Supply and Return Piping Diameter 2-1/8 (54)
HV High Volt Electrical Connection 83-7/8 (2130) 30-7/8 (784) 3 (76)
LV Low Volt Electrical Connection 81-3/8 (2067) 31-7/16 (799) 7/8 (22)
B Blower Outlet Opening 9-13/16 (249) 33 (838) 60-13/16 x 31 (1544 x 787)
* Field pitch Condensate Drain line a minimum of 1/8" (3.2 mm) per foot (305 mm). All units contain a factory-installed condensate trap. Do
not trap external to the unit. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply
with all local codes.
Source: DPN002034, Rev. 1

Liebert CW 90
 Piping Schematics

Figure 80 Primary connection locations, downflow models CW089, CW106 and CW114 with EC fans

NOTE: Drawing not to scale.

Tolerance on all All dimensions from
piping dimensions rear corner of unit
A A
is 1/2" (13mm). including panels
FRONT VIEW
X
SECTION A-A O

28-1/16" 31"
CWR 3 (712mm) (787mm)
Typical Air Typical Air 35"
Discharge Area Discharge Area (889mm)
CWS 3
CWS 2 LV2
LV1
E1 E2 B

CD FRONT OF UNIT
HUM DPN001628
CWR 2 Rev. 5
122" (3099mm)

Point Description X, in. (mm) Y, in. (mm) Connection Size / Opening

Condensate Drain * 103-1/2 (2629) 28 (711) 1-1/4" FPT
CD
W/ Optional Pump 103-1/2 (2629) 28 (711) 1/2" Cu Sweat
HUM Humidifier Supply Line 107-1/2 (2731) 29 (737) 1/4" Cu Sweat
CWS 2 2-Way Chilled Water Supply 118-1/2 (3010) 31 (787) CW106: 2-1/8"; CW089, CW114: 2-5/8"
CWS 3 3-Way Chilled Water Supply 115-1/2 (2934) 31 (787) CW106: 2-1/8"; CW089, CW114: 2-5/8"
CWR 2 2-Way Chilled Water Return 112-1/2 (2858) 31 (787) CW106: 2-1/8"; CW089, CW114: 2-5/8"
CWR 3 3-Way Chilled Water Return 115-1/2 (2934) 22 (559) CW106: 2-1/8"; CW089, CW114: 2-5/8"
E1 Electrical Connection (High Volt) 35 (889) 31 (787) 2"
E2 Electrical Connection (High Volt) 34 (864) 29 (737) 2"
LV1 Electrical Connection (Low Volt) 35-1/2 (902) 26-1/2 (673) 1-3/8"
LV2 Electrical Connection (Low Volt) 33-1/2 (851) 26-1/2 (673) 1-3/8"
B Blower Outlet 4 (102) 33 (838) 94 x 31 (2388mm x 787mm)
* Field-pitch condensate drain line a minimum of 1/8" (3.2 mm) per foot (305 mm). All units contain a factory-installed condensate
trap. Do not trap external to the unit. Drain line may contain boiling water. Select appropriate drain system materials. The drain line
must comply with all local codes.
Source: DPN001628, Rev. 5

91 Liebert CW
 Piping Schematics

Figure 81 Primary connection locations, downflow models CW146 and CW181 with EC fans

NOTE: Drawing not to scale.

Tolerance on all
piping dimensions A A All dimensions from
is 1/2" (13mm). rear corner of unit
FRONT VIEW including panels

SECTION A-A X
O

41" 29-3/8"
(1041mm) TYP (746mm) TYP 47"
AIR DISCHARGE AIR DISCHARGE (1194mm)
CWR AREA AREA

CD
LV1
LV2
CWS HUM LV3

E1 E2 B

FRONT OF UNIT
122" (3099mm)
DPN001693
Rev. 2

X Y
Point Description In. (mm) In. (mm) Connection Size / Opening
Condensate Drain * 110 (2794) 35 (889) 1-1/4" FPT
CD
W/ Optional Pump 110 (2794) 35 (889) 1/2" Cu Sweat
HUM Humidifier Supply Line 101 (2565) 43 (1092) 1/4" Cu Sweat
2-Way Chilled Water Supply 117 (2972) 37 (940) 3-1/8"
CWS
3-Way Chilled Water Supply 117 (2972) 37 (940) 3-1/8"
2-Way Chilled Water Return 117 (2972) 30 (762) 3-1/8"
CWR
3-Way Chilled Water Return 117 (2972) 30 (762) 3-1/8"
E1 Electrical Conn. (High Volt) 113 (2870) 43 (1092) 2"
E2 Electrical Conn. (High Volt) 110 (2794) 43 (1092) 2"
LV1 Electrical Conn. (Low Volt) 2-1/2 (64) 36 (914) 7/8"
LV2 Electrical Conn. (Low Volt) 2-1/2 (64) 37-1/2 (953) 7/8"
LV3 Electrical Conn. (Low Volt) 2-1/2 (64) 39 (991) 7/8"
B Blower Outlet 4-1/2 (114) 44 (1118) 93" x 41" (2362mmx1041mm)
* Field-pitch condensate drain line a minimum of 1/8" (3.2 mm) per foot (305 mm). All units contain a factory-installed condensate trap. Do
not trap external to the unit. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply
with all local codes.
Source: DPN001693, Rev. 2

Liebert CW 92
 Piping Schematics

Figure 82 Primary connection locations, downflow units, model CW300 and CW400 with EC fans

NOTE: Drawing not to scale. A A

Tolerance on all piping FRONT VIEW
dimensions is 1/2" (13mm). SECTION A-A

CWR2

92"
CD2
(2337mm)
CWS2
C

41"
(1041mm) typ. 46"
Air Discharge 29-3/8"
(1168mm)
CWR1 (746mm) typ.
Area
CD1 Air Discharge
Area LV1
Y LV2
CWS1 LV3
E1 E2 B
X
O 122" (3099mm)
DPN002434
All dimensions from front corner Front of Unit Rev. 0
of unit including panels

Point Description X, In. (mm) Y, In. (mm) Connection Size / Opening

Condensate Drain * 12 (305) 12 (305) 1-1/4" FPT
CD 1
W/ Optional Pump 12 (305) 12 (305) 1/2" Cu Sweat
Condensate Drain * 12 (305) 57 (1449) 1-1/4" FPT
CD 2
W/ Optional Pump 12 (305) 57 (1449) 1/2" Cu Sweat
2-way Chilled Water Supply 5 (127) 10 (254) 3-1/8"
CWS1
3-way Chilled Water Supply 5 (127) 10 (254) 3-1/8"
2-way Chilled Water Supply 5 (127) 55 (1397) 3-1/8"
CWS2
3-way Chilled Water Supply 5 (127) 55 (1397) 3-1/8"
2-way Chilled Water Return 5 (127) 17 (432) 3-1/8"
CWR1
3-way Chilled Water Return 5 (127) 17 (432) 3-1/8"
2-way Chilled Water Return 5 (127) 62 (1575) 3-1/8"
CWR2
3-way Chilled Water Return 5 (127) 62 (1575) 3-1/8"
E1 Electrical Conn. (High Volt) 9 (229) 4 (102) 2"
E2 Electrical Conn. (High Volt) 12 (305) 4 (102) 2"
LV1 Electrical Conn. (Low Volt) 119-1/2 (3035) 11 (279) 7/8"
LV2 Electrical Conn. (Low Volt) 119-1/2 (3035) 9-1/2 (241) 7/8"
LV3 Electrical Conn. (Low Volt) 119-1/2 (3035) 8 (203) 7/8"
B Front Blower Outlet 24-1/2 (622) 3 (76) 93" x 41" (2362mm x 1041mm)
C Rear Blower Outlet 24-1/2 (622) 48 (1219) 93" x 41" (2362mm x 1041mm)
* Field pitch Condensate Drain line a minimum of 1/8" (3.2 mm) per foot (305 mm). All units contain a factory-installed condensate trap. Do
not trap external to the unit. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply
with all local codes.
Source: DPN002434, Rev. 0

93 Liebert CW
 Piping Schematics

Figure 83 Piping connections, downflow models CW026 - CW084 with centrifugal fans

Monitoring
Panel

NOTE: Install all piping

per local codes.

C - Steam Reheat Supply Line Condensate Drain. Field-pitch a min. of

D - Hot Water Reheat Supply Line 1/8" (3mm) per ft. (305mm). 3/4" NP T for units
without factory installed condensate pump. Do
E - Steam Reheat Return Line
not install an external trap. 1/2" OD CU for units
(Field-install factory-supplied steam
with factory-installed condensate pump
trap with vacuum breaker)
1/4" OD CU Humidifier Supply Line (Steam Gen./Infrared)
F - Hot Water Reheat Return Line
B - Chilled Water Return Line.
1/2" NPT Male Steam Humidifier Supply Line - Chilled Water Supply Line on units with High Pressure
2 Way Valve Only
1/2" NPT Male Steam Humidifier Return Line A - Chilled Water Supply Line
- Chilled Water Return Line on units with High Pressure
2-Way Valve Only
OPTIONAL REHEAT SCHEMATICS
Supply Return
Y-Strainer Actuator
Steam Humidifier
Supply
Return Steam Trap
Y-Strainer Hot Water Reheat Coil
Optional Hot Water Reheat (2-Way Valve)
Optional Steam Humidifier
Actuator
Actuator
Supply Return
Y-Strainer
Return
Supply
Steam Trap DPN001666
Steam Reheat Coil
Y-Strainer Rev. 0
Optional Steam Reheat Hot Water Reheat Coil
Optional Hot Water Reheat (3-Way Valve)

A B C D E F
Models (OD Cu) (OD Cu) (NPT Male) (OD Cu) (NPT Male) (OD Cu)
CW026 1-1/8 1-1/8 1/2 5/8 1/2 5/8
CW038 1-3/8 1-3/8 1/2 5/8 1/2 5/8
CW041 1-5/8 1-5/8 1/2 5/8 1/2 5/8
CW051 1-5/8 1-5/8 1/2 7/8 1/2 7/8
CW060 2-1/8 2-1/8 3/4 7/8 3/4 7/8
CW076 2-1/8 2-1/8 3/4 7/8 3/4 7/8
CW084 2-1/8 2-1/8 3/4 7/8 3/4 7/8
Source: DPN001666, Rev. 0

Liebert CW 94
 Piping Schematics

Figure 84 Piping connections for downflow models CW106 and CW114 with centrifugal fans

Monitoring
Panel

NOTE: Install all piping

per local codes.

3/4" NPT Steam Generating Canister Humidifier

Drain. Field-pitch a minimum of 1/8" (3mm)
per ft. (305mm). Do not install an external trap.
B - Chilled Water Return Line.
1/4" OD CU Humidifier Water Supply Line
3-Way Valve Only
Condensate Drain. Field-pitch a min. of
A - Chilled Water Supply Line
1/8" (3mm) per ft. (305mm). 1-1/8" NP T for units
- Chilled Water Return Line
without factory-installed condensate pump. Do
on units with High Pressure
not install an external trap. 1/2" OD CU for units
2-Way Valve Only
with factory-installed condensate pump
B - Chilled Water Return Line
1/2" NPT Male Steam Humidifier Return Line
- Chilled Water Supply Line
1/2" NPT Male Steam Humidifier Supply Line
on units with High Pressure
2-Way Valve Only C-D - Steam/Hot Water Reheat Supply Line
E-F - Steam/Hot Water Reheat Return Line
OPTIONAL REHEAT SCHEMATICS
Supply Return

Y-Strainer Actuator
Steam Humidifier Supply
Steam Trap
Return
Y-Strainer Hot Water Reheat Coil
Optional Hot Water Reheat (2-Way Valve)
Optional Steam Humidifier
Actuator
Actuator Return
Supply

Y-Strainer
Return Supply

Steam Trap Steam Reheat Coil Y-Strainer Hot Water Reheat Coil

Optional Steam Reheat Optional Hot Water Reheat (3-Way Valve)

* This drawing pertains to CW106 & CW 114 with forward curve blowers onl y. DPN001667
Rev. 0

Piping Connection Sizes, inches

Model A B C D E F
Numbers OD Cu OD Cu NPT Male OD Cu NPT Male OD Cu
CW106 2-1/8 2-1/8 3/4 7/8 3/4 7/8
CW114 2-5/8 2-5/8 3/4 7/8 3/4 7/8
Source: DPN001667, Rev. 0

95 Liebert CW
 Piping Schematics

Figure 85 Upflow general arrangement

Air Flow
Chilled
Water
Supply Bleed
Valve

Chilled
Water
Return Valve
Actuator Chilled Water Coil

Shutoff * A
lve
Valves Ball Va
AB al)
3-Way (Option
Chilled
B
Water
Valve
Flow
3-WAY VALVE
Switch
Hose* (Optional Air Flow
Bibs

Chilled
Bleed
Water Supply
Valve Valve
Chilled Actuator
Water
Return 2-Way
Chilled
Water Chilled Water Coil
Valve

Shutoff *
Valves 2-WAY VALVE

Ball Valve
(Optional)

Hose*
Bibs FACTORY PIPING
FIELD PIPING
DPN001658
*Components are not supplied by Liebert
Rev. 0
but are recommended for proper
circuit operation and maintenance.

Liebert CW 96
 Piping Schematics

Figure 86 Piping connections for upflow models CW026 - CW084

UNIT FIELD PIPING LOCATIONS PLENUM FIELD PIPING LOCATIONS
Piping stubbed out inside unit end compartment for field For separate steam or hot water plenum in UPFLOW (UH)
connection through 2 5/8" x 10 3/4" (66 x 273mm) units, piping may exit through bottom, top or sides by field
opening as shown. Piping may also exit through bottom cutting an opening in a suitable location.
or top of end compartment by field cutting an opening in
a suitable location (except bottom return air units).
A - Chilled Water Supply Line.
1" (25mm) Rear Panel (Line is stubbed down, field
install elbow for side
connection). Plenum Left
End Panel
1-1/32" (26mm) B - Chilled Water Return Line.
2-5/8" (66mm) (Line is stubbed down, field
install elbow for side
connection).
1/4" OD CU Humidifier Water
Supply Line.
Condensate Drain. Field pitch a min. of 1/2" NPT Female Steam
10-3/4" 1/8" (3mm) per ft. (305mm). 3/4" NP T Humidifier Supply Line
(273mm for units without factory installed 1/2" NPT Female Steam
condensate pump. Do not install an Humidifier Return Line
7-1/2" external trap. C - Steam Reheat Supply Line
1/2" OD CU for units with factory F - Hot Water Reheat Return
(191mm)
installed condensate pump. Line
Piping outlet location on units E - Steam Reheat Return Line
w/rear return option. (Field-install factory-supplied
Unit Left steam trap with vacuum breaker)
End Panel NOTE: Install all piping
per local codes. D - Hot Water Reheat
Supply Line
OPTIONAL REHEAT SCHEMATICS
Supply Return
Actuator
Steam Humidifier
Steam Trap Supply
Return
Y-Strainer Hot Water Reheat Coil
Optional Hot Water Reheat (2-Way Valve)
Optional Steam Humidifier

Actuator
Actuator
Supply Return
Y-Strainer
Return Supply

Steam Trap Steam Reheat Coil

Y-Strainer Hot Water Reheat Coil
Optional Steam Reheat Optional Hot Water Reheat (3-Way Valve)

DPN001668
Rev. 0

Factory-Provided Piping Connection Sizes, inches

Models A, OD Cu B, OD Cu C, NPT Female D, OD Cu E, NPT Female F, OD Cu
CW026 1-1/8 1-1/8 1/2 5/8 1/2 5/8
CW038 1-3/8 1-3/8 1/2 5/8 1/2 5/8
CW041 1-5/8 1-5/8 1/2 5/8 1/2 5/8
CW051 1-5/8 1-5/8 3/4 7/8 3/4 7/8
CW060 2-1/8 2-1/8 3/4 7/8 3/4 7/8
CW076 2-1/8 2-1/8 3/4 7/8 3/4 7/8
CW084 2-1/8 2-1/8 3/4 7/8 3/4 7/8
Source: DPN001668, Rev. 0

97 Liebert CW
 Piping Schematics

Figure 87 Piping connections for upflow models CW106 and CW114

Piping stubbed out inside unit end A - Chilled Water Supply Line.
compartment for field-connection 2-5/8" O.D. Cu on three-way
through 13" x 6-1/2" (330 x 165mm) front return units only.
opening as shown. Piping also may
exit through bottom of end
compartment by field-cutting 1/4" OD Cu Humidifier Water
an opening. Supply Line.
Condensate Drain
1" (25mm) Field-pitch a min. of 1/8" (3mm) per ft. (305mm).
Rear Panel 1-1/4" NPT for units without a factory-installed
condensate pump.
1/2" OD Cu for units with factory-installed
condensate pump. Do not install an external trap.

A - Chilled Water Supply Line

2-5/8" O.D. Cu on three-way
front return units only.

B - Chilled Water Return Line

7-1/2" (191mm) 2-5/8" O.D. Cu

3" (76mm)
Note: Install all piping
per local codes.
Unit left
end panel
13" DPN001669
(330mm) Rev. 0

Liebert CW 98
 Checklist for Completed Installation

9.0 CHECKLIST FOR COMPLETED INSTALLATION

9.1 Moving and Placing Equipment

___ 1. Unpack and check received material.
___ 2. Proper clearance for service access has been maintained around the equipment.
___ 3. Equipment is level and mounting fasteners are tight.
___ 4. If the equipment has been disassembled for installation, unit must be reassembled per
instructions.

9.2 Electrical
___ 1. Supply voltage and phase matches equipment nameplate.
___ 2. Wiring connections completed between disconnect switch and unit.
___ 3. Power line circuit breakers or fuses have proper ratings for equipment installed.
___ 4. All internal and external high- and low-voltage wiring connections are tight.
___ 5. Confirm that unit is properly grounded to an earth ground.
___ 6. Control transformer setting matches incoming power.
___ 7. Electrical service conforms to national and local codes.
___ 8. Check blowers for proper rotation.

9.3 Piping
___ 1. Piping completed to coolant.
___ 2. Piping has been checked for leaks.
___ 3. Piping is properly sized, sloped, trapped as shown in the piping schematics
___ 4. Check piping inside and outside of equipment for proper support.
___ 5. Ensure that factory clamps have been reinstalled
___ 6. Drain line connected and pitched per local code.
___ 7. Water supply line connected to humidifier

9.4 Other
___ 1. Ducting complete (if required), maintain access to filters.
___ 2. Filters installed.
___ 3. Check fasteners that secure reheats, humidifier and motors-some may have become loose
during shipment.
___ 4. Verify water detection is properly installed around all units.
___ 5. Control panel DIP switches are set based on user requirements.
___ 6. Blower drive system rotates freely and belts are properly aligned and tensioned
___ 7. All fans are free of debris.
___ 8. Remove rubber band from float in optional infrared humidifier.
___ 9. Installation materials and tools have been removed from equipment (literature, shipping
materials, construction materials, tools, etc.)
___ 10. Locate blank startup sheet, ready for completion by installer or startup technician.

99 Liebert CW
 Initial Startup Checks and Commissioning Procedure for Warranty Inspection

10.0 INITIAL STARTUP CHECKS AND COMMISSIONING PROCEDURE FOR WARRANTY

INSPECTION
Locate the startup form supplied with the unit documents. Complete the form during startup and
mail it to your local Emerson Network Power sales office after startup is completed. Contact your
Emerson supplier if you have any questions or problems during installation, startup or operation.

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
Potentially lethal voltages exist within this equipment during operation. Observe all cautions
and warnings on the unit and in this manual. Failure to do so could result in serious injury or
death. Only properly trained and qualified service and maintenance personnel should work
with this equipment.

! WARNING
Risk of fire suppression and alarm system activation. Can cause injury or death during
building evacuation and mobilization of emergency fire and rescue services.
Startup operation of optional electric reheat elements may activate facility alarm and fire
suppression system. Prepare and take appropriate steps to manage this possibility. Activating
reheat during initial startup may burn off particulates from electric reheat elements.
Check the steam generating humidifier electrode plugs to ensure that they are pressed firmly
onto the pins. Loose connections will cause the cylinder and plugs to overheat.
Before beginning initial startup checks, make certain that unit was installed according to the
instructions in this manual. All exterior panels must be in place.

10.1 Information for Warranty InspectionRemove Power From Unit Disconnect

Complete the following items on the warranty inspection form:
Installer name and address
Owner name and address
Site contact name and phone number
Installation date
Indoor unit model number and serial number
Condition of unit when received
Is there a freight damage claim in process? If so, have all relevant parties been notified?
Have manuals been kept with unit?
Is the Liebert Thermal Management unit connected to site monitoring or switchover controls?
Provide model and serial of connected controls for switchover controls.

10.2 Startup Checks With Panels Removed and Main Disconnect Off
___ 1. Check all internal piping clamps and tighten or secure if needed.
___ 2. Check field piping for proper support and proper connection.
___ 3. Check unit belts for correct tension and alignment.
___ 4. Check unit electrical connections to the control boards and tighten or secure if needed.
___ 5. Remove all debris, tools and documents from unit area.

Liebert CW 100
 Initial Startup Checks and Commissioning Procedure for Warranty Inspection

10.2.1 Inspect and Record

Main Fan hp: _________________________
Voltage: _________________________
Proper Belt Tension and Alignment: _________________________
Belt Size: _________________________
Motor Sheave: _________________________
Fan Pulley: _________________________
EC Plug Fan: Assemblies Tight and Secured (check one)
___ Fan secured in UP position
___ Fan secured in Down position
Filter Size: _________________________
Quantity: _________________________

10.3 Startup
1. Disconnect all power to the environmental control unit.
2. Tighten all electrical wiring connections on electric panel and at all major components, such as
compressors and motors that may have loosened during shipping.
3. Remove all line voltage fuses except the main fan fuses at the far right of the electric panel and
the control voltage fuses at the far left of the electric panel. For units supplied with circuit
breakers, open them instead of removing fuses.
4. Turn on electrical input power and check the line voltage on the main unit disconnect switch. Line
voltage must be within 10% of the nameplate voltage.
5. Turn ON the main unit disconnect switch and check the secondary voltage at transformer T1.
Voltage at T1 must be 24VAC, 2.5VAC (check at TB1-1 and TB1-8). T1 voltage must not exceed
28VAC. Change the primary tap if necessary.
6. Push the ON button. Blower will start and the ON lamp will light.
7. If you do not want your unit to operate at factory default settings, manually set temperature
setpoints and sensitivity, alarms and other control functions. Refer to the Liebert iCOM manual,
SL-18835, available at the Liebert Web site, www.liebert.com
8. Turn Off the main unit disconnect and main breaker. The unit On button should be Off.
9. Replace all fuses removed during Step 3 (or reset the circuit breakers).
10. Restore electrical power to the unit; turn ON the main unit disconnect switch.
11. Check the current draw on all line voltage components and match with the serial tag.
12. Push the ON button, putting the unit into operation.
13. Check for unusual noises and vibration.
14. Check all water lines for leaks.
15. Test all unit functions for proper operation.
Return the completed startup form to your local Emerson Network Power sales office.

10.4 Additional Considerations for Upflow Units

These units are manufactured with factory-supplied adjustable motor sheaves. Due to variations in
applications, a fixed motor pulley may be desired and can be substituted for the adjustable sheave
after obtaining and confirming the desired airflow. This will reduce vibration and wear on the belts
and pulleys. Consult your Emerson representative for more information.

101 Liebert CW
 Troubleshooting

11.0 TROUBLESHOOTING

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
Only properly trained and qualified personnel should perform service on these units. Lethal
voltage is present in some circuits. Use caution when troubleshooting with power on.
Disconnect and lock out power before replacing components. Use caution and standard
procedures when working with pressurized pipes and tubes.

NOTICE
Risk of improper control circuits. Can cause equipment damage.
When using jumpers for troubleshooting, always remove jumpers when maintenance is
complete. Jumpers left connected could override controls and cause equipment damage.
Table 9 Blower troubleshooting
Symptom Possible Cause Check or Remedy
No main power Check L1, L2 and L3 for rated voltage.
Blown fuse or tripped circuit
Check fuses or CBs to main fan.
breaker (CB)
Overloads tripped Push reset button on main fan overload. Check amp. draw.
Blower will not start
No output voltage from Check for 24 VAC between P24-2 and P24-1. If no voltage,
transformer check primary voltage.
Control fuse blown or circuit Check for 24 VAC between P4-4 and E1. If no voltage,
breaker tripped check for short. Replace fuse or reset circuit breaker.
Check for 24 VAC between P36-9 and P36-10. If voltage is
not present, R1 is not receiving power.
Check air switch. Jumper P36-4 to P36-7 If R1 closes, air
Blower runs but controls Relay R1 not making contact
switch is not closing (check for blower rotation, loose wiring
will not operate (standard controls only)
and pinched tubing.) Remove jumper.
Check for 24 VAC at R1 coil. If the voltage is present and R1
is not pulling, replace R1.

Table 10 Chilled water troubleshooting

Symptom Possible Causes Check or Remedy
Check for 24 VAC between P22-3 and P22-5 (open), or
Actuator Motors No 24 VAC power to motor
P22-1 and P22-5 (closed).
Chilled water or hot
Motor operates but valve wont Check linkage for adjustment and be sure that it is tight on
water/steam valve not
open the valve.
opening
Check linkage for adjustment and be sure that it is tight on
No 24 VAC power to motor
the valve.
Check DC voltage on printed circuit board in motor. Terminal
No. 1 is grounded and No. 3 is positive. DC voltage should
No signal from control vary from 0.8 to 2.0 VDC or above as temperature control is
Modulating Motors varied below room temperature on cooling valve or above
room temperature on heating valve.
Remove wires on terminal No. 1 and No. 3 from the motor
(do not short). With 24 VAC power from TR to TR jumper
Motor not working
terminal 1 and 2 on motor to drive open. Remove jumper to
drive closed, if motor fails to work, replace it.

Liebert CW 102
 Troubleshooting

Table 11 Humidifiersteam generator troubleshooting

Symptom Possible Cause Check or Remedy
Check drain valve to ensure that it drains freely. Check
and replace if defective.
False canister full
Foaming Check water supply. If commercially softened,
indication
reconnect to raw water supply. If connected to hot
water reconnect to cold water.
Main 24 VAC fuse or Shorts or loose connections Check the wiring connections of the 24 VAC circuit.
circuit breaker trips Faulty circuit board Replace the circuit board.
Verify that RUN/DRAIN switch is in the RUN position.
Unit ON, humidifier will Check fuses or CBs and replace or reset if necessary.
Humidifier not receiving power
not operate
Make sure molex connector is securely plugged into
circuit board and that no wires art loose.
No water available to unit Check external shut-off valves.
Contactor pulled in, but Clogged fill line strainer Clean or replace fill line strainer.
no water enters
canister Wiring breaks or loose connections Check for faulty wiring and loose connections.
Faulty circuit board Replace circuit board.
Water enters canister,
but canister full circuit
Foaming Check drain valve and water supply.
activates at a low water
level
Check connection on component plate in humidifier
cabinet Terminal #1 on the square block interface
device must be connected to L2 of the power terminal
block. L2 must also be connected to the electrode
Canister interface connections
closest to the steam outlet port.
incorrect
Verify that the red wire from terminal #2 on the
interface connects to the red top terminal on the
Water enters canister, canister. This is the one farthest from the steam outlet
but canister full circuit port and is the high-water sensor probe.
activates at a low water
level Remove red canister full wire from canister. If normal
operation resumes, canister must be replaced.
Full isolation has broken down Remove the wire from terminal #3 on the interface. If
normal operation resumes, canister full interface must
be replaced.
Drain assembly not operating freely Check and replace coil or valve if necessary.
Faulty circuit board Replace circuit board
Canister fills but Check wiring of canister full interface. Replace circuit
Canister full circuit does not activate
overflows board.
Humidifier contactor is See similar symptoms above. Canister expired.
Cylinder full. Interface activated.
not pulled in (to reset, Replace canister.
de-energize control Water supply is not on. Fill valve problem. Drain valve
unit) Problem with fill water system
stuck open.
Canister expired. Replace canister. DIP switch
settings changed with water in canister. Drain canister,
call Emerson Network Power Liebert Services.
Humidifier amps reached 138% of full Humidifier fill valve stuck open; check valve. Water
Red LED on humidifier load conductivity too high; check water conductivity/quality.
control board is on. Contact Liebert Services.
Humidifier contactor not DIP switches set incorrectly. Refer to Circuit Board
pulled in (to reset, de- Adjustments on page 114
energize control circuit) Check drain valve for obstructions and clean if
Mineral deposits obstruct drain valve
necessary.
Faulty solenoid Check for magnetic field at coil.
Faulty circuit board Replace circuit board.

103 Liebert CW
 Troubleshooting

Table 11 Humidifiersteam generator troubleshooting (continued)

Symptom Possible Cause Check or Remedy
Verify that drain valve operates freely when activated.
Clean valve and replace coil or valve if defective.
Drain valve clogged or defective
Flush canister several times and replace if arcing
persists
If water is commercially softened, reconnect humidifier
Excessive arcing in the Improper water supply to raw water supply, drain canister and restart. If
canister connected to hot supply, reconnect to cold water.
Increase drain rate by adjusting % pot on circuit board
Insufficient drain rate
above the preset 87% (85%) to roughly 92% (90%).
Analyze iron cement of water. If it exceeds 0.1 mg/l,
Excessive iron content in water
install a filter to remove iron from water supply.
On cold startup, Turn the % pot to roughly 82% (80%). Restart
canister fills, high-water Conductivity of water too low humidifier. If canister fails to reach FLA in 24 hours,
alarm activates and have water supply conductivity checked.
humidifier fails to reach
full amperage after 24 If humidifier returns to canister full condition, verity that
Fill solenoid not closing tightly
hours the fill solenoid closes tightly.

Table 12 Humidifierinfrared troubleshooting

Symptom Possible Cause Check or Remedy
Check water supply.
Check fill valve operation
Humidifier pan not filling
Check drain stand pipe adjustment
Check for clogged waterline
Control not calling for humidity Check monitor status
No humidification Check visually. If contact is made, check line voltage
after contactor and fuses or CBs.
Humidity contact not pulling in Check for open humidifier safety stat. Jumper between
terminals P35-6 and P35-5. If contactor pulls in,
replace safety. Remove jumper.
Replace bulb. Loosen lead on old bulb. Trim excess
Humidifier bulb burned out
lead length on new bulb to avoid shorts.
Table 13 Reheat troubleshooting
Symptom Possible Cause Check or Remedy
Control not calling for heat Check monitor status.
Reheat will not operate; Jumper between terminals P34-1 and P34-2. If reheat
contactor not pulling in Reheat safety stat open operates, safety is open. Remove jumper. Replace
safety.
Reheat not operating, Turn off power and check heater continuity with Ohm
Heater burned out
contactor pulling in meter.

Liebert CW 104
 Maintenance

12.0 MAINTENANCE
For assistance, contact Emerson Network Power Liebert Services at 1-800-LIEBERT.

12.1 System Testing

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
Potentially lethal voltages exist within this equipment during operation. Observe all cautions
and warnings on unit and in this manual. Failure to do so could result in serious injury or
death. Only qualified service and maintenance personnel should work with this equipment.

12.1.1 Environmental Control Functions

The performance of all control circuits can be tested by actuating each of the main functions. This is
done by temporarily changing the setpoints.

Cooling
To test the cooling function, set the setpoint to a temperature 10F (5C) below room temperature. A
call for cooling should be seen and the equipment should begin to cool. A high-temperature alarm may
come on. Disregard it. Return setpoint to the desired temperature.

Proportional Cooling
The Liebert iCOM is capable of responding to changes in room conditions. These systems utilize
either a two or three-way valve activated by a proportioning motor. Refer to the Liebert iCOM user
manual, SL-18835, available at the Liebert Web site, www.liebert.com, for large or small display
operation and settings.
The Liebert iCOM will respond by positioning the valve proportionally to match the needs of the
room. Full travel of the valve takes place within the range of the sensitivity setting.

12.1.2 Electric Panel

The electric panel should be inspected for any loose electrical connections.

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
Be sure that power to the unit is shut down before attempting to tighten any fittings or
connections.

Control Transformer and Fuses

The control system is divided into four (4) separate circuits. Fuses located on the transformer/fuse
board individually protect the control voltage circuits. If any of the fuses are blown, first eliminate
shorts, then use spare fuses supplied with unit. Use only type and size of fuse specified for your unit.
The small isolation transformer on the main control board supplies 24 volts to the electronics. The
transformer is internally protected. If the internal protector opens, the transformer/fuse board must
be replaced. Also check the control voltage fuse on the main control board before replacing the
transformer/fuse board.

Fan Safety Switch

For Liebert CW units, the Fan Safety Switch is in the low-voltage compartment and consists of a
diaphragm switch and interconnecting tubing to the blower scroll. The Fan Safety switch is wired
directly to the control circuit to deactivate the unit and activate the alarm system if airflow is
interrupted.

105 Liebert CW
 Maintenance

Firestat
The optional firestat is a bimetal operated sensing device with a Normally Closed switch. This device
will shut down the entire unit when the inlet air temperature exceeds a preset point. It is connected
between terminals 1 and 2 at plug P39.

Smoke Detector
The optional smoke detector power supply is located on the base of the upflow units and at the top of
downflow units. It is constantly sampling return air through a tube. No adjustments are required.

Water Detection Sensor

! WARNING
Risk of fire or explosion. Can cause injury or death.
Do not use near flammable liquids or for flammable liquid detection.

Emerson manufactures a variety of water-detection systems, including point, zone and cable systems.
Follow the instructions supplied with your selected device for proper installation, adjustment and
maintenance.

Remote Shutdown
A connection point is provided for customer-supplied remote shutdown devices. Terminals 37 & 38 on
the terminal strip are jumpered when no remote shutdown device is installed. Refer to the units
electrical schematic and the units installation manual.

12.2 Filters
Filters are usually the most neglected item in an environmental control system. To maintain efficient
operation, they should be checked monthly and changed as required. Because replacement intervals
vary with environmental condition and filter type, each unit is equipped with a filter clog switch. This
warns of restricted airflow through the filter compartment by activating the Change Filter alarm.
Turn power Off before replacing filters.
Liebert CW filters can be replaced from either end by opening the end doors. On CW089, CW106
and CW114 units, filters can be replaced from the front. Liebert CW models CW146 and CW181
contain filters in a filter plenum that permits removing the filters from the front. Removing the
middle filters will allow you to remove the filters on the end. Install the new end filters first, then
the middle ones.
Replacement filters are commercially available in several efficiencies. For Liebert CW units, refer
to the technical data manual, SL-18056, or other documentation for filter sizes.
After replacing the filter(s), test the operation of the filter clog switch. Turn the adjusting screw
counter clockwise to trip the switchthis will energize the Change Filter alarm. To adjust the
switch:
1. With the fan running, set the switch to energize the light with clean filters. The unit panels must
all be in place and closed to accurately find this point.
2. Turn the adjusting knob one turn clockwise, or to the desired filter change point.

Liebert CW 106
 Maintenance

12.3 Blower PackageCentrifugal Fans

Periodic checks of the blower package include: belt, motor mounts, fan bearings and impellers.
These units are manufactured with factory-supplied adjustable motor sheaves. Due to variations in
applications, a fixed motor pulley may be desired and can be substituted for the adjustable sheave
after obtaining and confirming the desired airflow. This will reduce vibration and wear on the belts
and pulleys. Consult your Emerson representative for more information.

12.3.1 Fan Impellers and Bearings

Fan impellers should be periodically inspected and any debris removed. Check to see if they are
tightly mounted on the fan shaft. Rotate the impellers and make sure they do not rub against the fan
housing.
Bearings used on the units are permanently sealed and self-lubricating. They should be inspected for
signs of wear when belts are adjusted. Shake the pulley and look for movement in the fan shaft. If any
excessive movement is noticed, bearings should be replaced. However, the cause of the wear must be
determined and corrected before returning the unit to operation.

12.3.2 BeltsExcept with EC Fans

The drive belt should be checked monthly for signs of wear and proper tension. Pressing in on belts
midway between the sheave and pulley should produce from 1/2" to 1" (12 to 25mm) of movement.
Belts that are too tight can cause excessive bearing wear.
Belt tension is adjusted by raising or lowering the fan motor base. To adjust the motor, loosen (but do
not remove) the four motor mounting bolts. Turn adjustment bolt(s) on motor mounting base to adjust
belt tension or to raise motor to remove belts. Tighten motor bolts after adjustment. If belt appears
cracked or worn, it should be replaced with a matched belt (identically sized). With proper care, a belt
should last several years.

12.3.3 Electronic Variable Speed Drive (Inverter)

On large Liebert CW models, an optional, variable speed drive inverter is available. This packaged
unit is factory-set and should not require field adjustment. The variable speed drive saves power by
reducing blower speed to match unit load. If you suspect a problem with the inverter, first make sure
that the INTELLIGENT CONTROL method is selected at the microprocessor.
1. Turn off all power to the unit at the disconnect.
2. Open the unit accent panel and electric box cover.
3. Find the main fan motor wires. These are connected to the motor overload relay in the
high-voltage section of the electric box.
a. Mark motor wires to ensure they can be reconnected in the same order.
b. Disconnect motor wires at the load side of the motor overload relay.
c. Close the electric box cover.
4. Remove the right front vertical panel to gain access to the variable speed drive.
5. With the panel removed, restore power to the unit by turning the disconnect on.
6. Place the right front vertical panel back on the unit.
7. Reconnect the motor wires to the overload and close the electric box cover and unit accent panel.
8. Restore power at the disconnect.

12.4 Blower PackageEC Fans

12.4.1 Fan Impellers and Bearings
Fan impellers should be periodically inspected and any debris removed. Check to see if the impellers
can rotate freely and if the fan guards are still properly mounted for sufficient protection against
accidentally touching the impeller. Bearings used on the units are maintenance free. Consult the
factory for more information.

107 Liebert CW
 Maintenance

12.4.2 Protective Features

Monitoring functions protect the motor against overtemperature of electronics, overtemperature of
motor and incorrect rotor position detection. With any of these failures, an alarm will display through
the Liebert iCOM and the motor stops electronically. There is no automatic restart. The power must
be switched off for a minimum of 20 seconds once the motor is at a standstill.
The motor also provides locked rotor protection, undervoltage/phase failure detection and motor
current limitation. These conditions will display an alarm through the Liebert iCOM.

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
When connecting the motor to the mains, dangerous voltages occur. Do not open the motor
within the first 5 minutes after disconnection of all phases.
Dangerous external voltages can be present at main fan terminal KL2 even with the motor
being turned off.

! CAUTION
Risk of hot surfaces. Can cause injury.
Wear thermally insulated gloves and a long-sleeved shirt when touching the electronics
housing or allow time for the housing to cool before replacing parts.
The electronics housing can get hot and can cause severe burns

! CAUTION
Risk of improper moving, lifting and handling. Can cause equipment damage or injury.
Only properly trained and qualified personnel should work on this equipment. Fan modules
weigh in excess of 100 pounds each and may require more than one person or a mechanical
lifting device to raise or lower the fan(s) safely. Use proper lifting techniques and wear
protective clothing, gloves, shoes and head gear to avoid injury and dropping the fan module
during removal.

NOTICE
Risk of improper installation. Can cause equipment damage. Only a properly trained and
qualified technician should install or open this motor.
Use 60/75C copper wire only. Use Class 1 wires only.

12.5 Humidifier
12.5.1 Infrared Humidifier
During normal humidifier operation, deposits of mineral solids will collect in the humidifier pan and
on the float switch. These must be cleaned periodically to ensure proper operation. Frequency of
cleaning must be locally established because it depends on humidifier usage and local water quality.
A spare pan is recommended to reduce maintenance time at unit. The Liebert autoflush system can
greatly increase the time between cleanings, but does not eliminate the need for periodic checks and
maintenance (see the Liebert iCOM user manual, SL-18835, available at the Liebert Web site,
www.liebert.com, for autoflush setup). To help reduce excessive scaling in locations with difficult
water quality, the use of Vapure is recommended (contact your local Emerson representative).

Liebert CW 108
 Maintenance

12.5.2 Cleaning Humidifier Pan and Float Switch

Before turning off unit:
1. With the unit operating, remove call for humidification at the Liebert iCOM control.
2. Let the blower operate 5 minutes to allow the humidifier and water to cool.
3. If the unit has a condensate pump, turn the unit Off at the Liebert iCOM control.
4. Pull out the humidifier standpipe in pan.
5. Inspect the O-ring (replace if necessary).
6. Let the pan drain and the condensate pump operate (if applicable).
7. Disconnect power from the unit.
8. Disconnect the drain coupling from the bottom of the pan.
9. Remove the thermostat from the bottom of the pan and retaining screws from sides of pan.
10. Slide pan out.
11. Loosen scale on the side and bottom of the pan with a stiff nylon brush or plastic scraper.
12. Flush with water.
13. Carefully clean the scale from the float switch (make sure to reinstall correctly; see Figure 88).
14. Reinstall the pan, thermostat, standpipe, drain coupling and screws into the humidifier.
15. Operate the humidifier and check for leaks.

Figure 88 Correct orientation of float switch

Correct Switch Orientation

Incorrect Switch Orientation

DPN000996
Rev. 0

109 Liebert CW
 Maintenance

12.5.3 Changing Humidifier Lamps

NOTE
Touching quartz lamps with bare hands will severely shorten bulb life. Skin oils create hot
spots on lamp surface. Wear clean cotton gloves when handling lamps.

1. Remove the humidifier pan (see 12.5.2 - Cleaning Humidifier Pan and Float Switch, Steps 1
through 10).
2. Disconnect power from the unit.
3. At the humidifier, remove the screws and cover from the high-voltage compartment.
4. Disconnect one end of the purple jumper wires.
5. Using a continuity meter, locate the burned-out lamp.
6. Remove the lamp brackets under the lamps.
7. Loosen the two screws securing the lamp lead wires to the junction block.
8. Pull the bulb straight down and discard it.
9. Wrap the lead wires once around the new lamps metal ends. This will support the lamp and allow
for thermal expansion. Insert the lead wires into the junction block and torque the screws to 30
in-lb.
10. Reassemble by reversing Steps 1 through 9.

Figure 89 Infrared humidifier lamps

Infrared Bulbs

12.6 Steam Generating Humidifier

The humidifier drains and refills to maintain a current setpoint and alert the operator when the
humidifier canister needs to be replaced. The humidifier is located in the lower section of upflow
units. In downflow units, the humidifier is in the middle section.

Figure 90 Steam generating humidifier

Liebert CW 110
 Maintenance

Operation
NOTE
Numbers and percentages within parentheses in the following paragraphs refer to circuit
board settings for downflow models CW106 and CW114.
1. During startup, when the humidity control calls for humidification, the fill valve opens and allows
water to enter the canister. When the water level reaches the electrodes, current flows and the
water begins to warm. The canister fills until the amperage reaches the setpoint and the fill valve
closes. As the water warms, its conductivity increases and the current flow, in turn, rises. If the
current reaches 115% of the normal operating current, the drain valve opens and drains some of
the water out of the canister. This reduces electrode contact with the water and lowers the
current flow to the amperage setpoint. Boiling soon commences, and the canister operates
normally.
2. If the conductivity of the water is low, the canister fills and the water level reaches the canister
full electrode before the current setpoint is reached. The humidifier stops filling to prevent
overflow. Boiling should commence in time. As water is boiled off, the mineral concentration in
the canister increases and current flow also increases. The canister eventually reaches full output
and goes to normal operation. No drain is permitted until then.
3. When full output is reached the circuit board starts a time cycle which is factory-set at 60 (84)
seconds. During this repeating time cycle, the fill valve will open periodically to replenish the
water being boiled off and maintain a steady state output at the setpoint.
4. After many cycles, the mineral concentration in the canister becomes too high. When this occurs,
the water boils too quickly. As the water quickly boils off and less of the electrode is exposed, the
current flow decreases. When the current crosses the low threshold point before the end of the
time cycle, the drain valve opens, draining the mineral-laden water out and replacing it with
fresh water. This lowers the mineral concentration and returns the canister to steady state
operation and prolongs canister life. The frequency of drains depends on water conductivity.
5. Over a period of time (usually between 500 and 1500 hours depending on water quality), the
electrode surface will become coated with a layer of insulating material, which causes a drop in
current flow. As this happens, the water level in the canister will slowly rise exposing new
electrode surface to the water to maintain normal output. Eventually, the steady state water level
will reach the canister full electrode and indicate so by activating the canister full alarm and
opening the humidifier contactor. At this point, all of the electrode surface has been used up and
the canister must be replaced.
6. After the entire electrode surface has been coated, the output will slowly begin to fall off. This
usually occurs in the last several hours of electrode life and should allow enough time to schedule
maintenance. During these last hours, the mineral concentration can increase. If the mineral
concentration is too high, arcing can occur. If the electrodes start to arc, turn off the humidifier
immediately and replace the canister with the identical part.

Controls
The humidifier RUN/DRAIN switch is located in the unit low-voltage compartment for most models
(in the humidifier assembly for models CW106 and CW114). This switch should be in the RUN
position when the humidifier is in normal operation; it should be in the DRAIN position when a
manual drain for service is required. The electronic control board for the humidifier is located in the
same area as the humidifier RUN/DRAIN switch. When the main unit is energized, power is available
to the humidifier circuits.
Figure 91 Run/drain switch

111 Liebert CW
 Maintenance

Replacing the Canister

See Step 5 of Operation in 12.6 - Steam Generating Humidifier for indications that a canister
may need to be replaced.
To replace the canister:
1. Turn off the humidifier by lowering the humidity setpoint below the ambient humidity level.
Record the original setpoint.
2. Place the RUN/DRAIN switch in the DRAIN position to drain the water from the canister.
3. Return the RUN/DRAIN switch to the RUN position after the canister has drained.

! WARNING
Risk of humidifier canister meltdown, smoke and fire. Can cause fire suppression system
activation, fire and smoke alarm activation, serious equipment and building damage, injury
and death.
Using a humidifier canister that has reached the end of its service life can be extremely
hazardous. If the canister cannot be replaced immediately at the end of life condition, turn Off
the power and water supply to the humidifier and remove the canister until a replacement
canister can be installed.

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
To avoid a shock hazard, all power to the unit must be disconnected before proceeding with
the canister replacement procedure.

! CAUTION
Risk of hot humidifier canister and steam hose. Can cause injury. Allow time for the
humidifier to cool before replacing parts.
4. Turn Off the power at the main unit.
5. Remove the cover from the humidifier cabinet
6. For all models except CW106 and CW114, refer to the replacement instructions that accompany
the replacement kit 153315P1 and P2.
7. For models CW106 and CW114, locate the power wires to the steam canister. Make note of the
wiring configuration before removing any wires. Refer to the schematic on the unit. Slide the
rubber boot back to expose the connections. Remove the three power wires and the canister-full
wires at Terminals 1, 2 and 3. Do not loosen the screws that secure the electrodes.
8. For all models, use a screwdriver to remove the hose clamps that secure the drain and overflow
hoses from the canister ports.
9. Loosen the fill line compression fitting and remove the tube from the input canister port.
10. Loosen the steam outlet hose clamps and slide the steam hose away from the canister fitting.
Release the canister clamp along the base of the canister.
11. The canister is now ready to be removed.
On downflow units: Slide the humidifier cabinet bottom straight out toward you and drop the
canister through the bottom of the cabinet.
On all other units: Pull the canister straight out of the cabinet toward you.
12. Replace the canister with the part indicated in the following table.
Table 14 Humidifier canister part numbers
Capacity
Unit Model Part Number Voltage lb/hr kg/hr
200-230 380-575*
All except below 11 or 22 5 or 10
153315P2 153315P1
136799P1 200-480 22 10
CW106 CW114
136799P2 575 22 10
* Note: 575V units have a step-down transformer included with unit.

Liebert CW 112
 Maintenance

13. Replace the canister by reversing the above procedure. Make special note of the following:
NOTE
When reconnecting the power wiring, follow exactly the instructions included with kit
153315P1 and P2 or the unit electrical schematic with canisters 136799P1 and P2.
When replacing the canister, always check the fill and drain solenoids for proper operation
Table 15 Faultscanister generator humidifier
Priority Name LED Indication Description
1 Over Current Solid Humidifier Lockout
2 Fill Valve 2 second flash Humidifier Lockout
3 End of Life 4 second flash Humidifier Lockout
4 Fail to Make Capacity 1 second flash Indicate only

Fault Descriptions
OvercurrentOperating current exceeds present limit
Fill ValveContinuously energized valve exceeds preset limit
End of LifeDrain count limit exceeded in a 24-hour period
Fail to Make CapacityDoes not reach operational current within initial 24 hours
Test Points
TP1Time Cycle Pot 1 VDC = 60 seconds
TP2Low Drain Pot 3 VDC = 80%
TP3Capacity Pot 3.5 VDC = 85%
TP5RT Capacity 1 VDC = 100%

113 Liebert CW
 Maintenance

Circuit Board Adjustments

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
Circuit board adjustment should be performed by properly trained and qualified personnel
only. Hazardous voltages are present in the equipment throughout the procedure. Use
extreme caution. If desired, power may be disconnected prior to the procedure.

NOTE
Numbers and percentages within parentheses in the following paragraphs refer to circuit
board settings for downflow models CW106 and CW114.
Humidifier operation is governed by the humidifier control board. This board is located in the lower
right area of the panel in the control section of the unit, or in the humidifier compartment on models
CW106 and CW114. There are two potentiometers mounted on the board. These pots can be used to
adjust for extreme water conductivity conditions and capacity.
The % pot controls the amperage at which the drain will energize. The pot is clearly marked in
percentages. This adjustment is factory-set, which indicates that the unit will drain when the
amperage falls off of the capacity setpoint. Raising the value increases the frequency of drain cycles.
Lowering the value decreases the frequency of drain cycles. The frequency should be increased for
highly conductive water and decreased for less conductive water. If adjustment is necessary and a
change of three to four percent in either direction does not permit normal operation of the unit,
consult your Liebert supplier.
The pot marked SEC controls the duration of the drain cycle. The pot is clearly marked in seconds.
This adjustment is factory-set at 60 (84) seconds and should not be readjusted without consulting
your Liebert supplier.
Table 16 Steam generating humidifier capacity
Capacity
60 Hz Models 50 Hz Models lb/hr (kg/hr)
CW026, CW038, CW041 CW026, CW038, CW041 11 (5)
CW051, CW060, CW076, CW051, CW060, CW076,
22 (10)
CW084, CW106, CW114 CW084, CW106, CW114

! WARNING
Risk of electric shock and slipping hazard from incorrect DIP switch settings. Can cause
injury or death.
The DIP switches must be set exactly as indicated in Table 17. Failure to correctly set the
DIP switches may result in an electrical or water hazard.

The DIP switches are used to set the capacity of the humidifier. These are set at the factory and
should not be changed. Refer to Table 16 for the capacity of your unit. Find your unit voltage and
capacity in Table 17 to determine the correct DIP switch settings for your humidifier. A
potentiometer (R40) is used to regulate the capacity of the humidifier. This adjustment is factory-set
fully clockwise to 100%. It can be used to reduce humidifier capacity, but should never be used to raise
the capacity above the capacity for your model. Turn the adjustment counterclockwise to reduce your
capacity. The minimum setting is approximately 50% of the DIP switch setting.

Liebert CW 114
 Maintenance

Figure 92 Steam generating humidifier control board

GT-421 V*.* YYDDD

Drain Tempering
Shunt ON OFF

Fault LED TP6

DIP Switch TP7

Down (Off), Up (On) Transformer
TP5
TP3
Capacity P3

TP2
Low Drain P2
Microprocessor

TP1
Time Cycle P1

183116
Rev. 2
Table 17 DIP switch settings for steam generating humidifier
Rated Values
Unit Rated
Voltage Capacity SW1 SW2 SW3 SW4 Voltage AMP Set Pt
200/208 11 Off On Off On 208 12.6
200/208 22 On Off On On 208 23.8
230 11 Off Off Off On 240 10.5
230 22 Off Off On On 240 20.3
380/400/415 11 On On Off Off 400 6.3
380/400/415 22 Off On On On 400 12.6
460 11 On Off Off Off 480 5.5
460 22 Off Off Off On 480 10.5
575* 11 Off Off Off Off 575 4.2
575* 22 Off On Off On 575 9.8
*The values are only suitable in models CW106D and CW114D. All other models use a 575V-to-460V step-down
transformer and therefore use the 460V settings.
Source: 183116, Rev. 2

115 Liebert CW
 Maintenance

12.7 Condensate Drain and Condensate Pump Systems

12.7.1 Condensate Drain
Check and clear obstructions in tubing during routine maintenance.

12.7.2 Condensate Pump

Disconnect power to unit using disconnect switch.
Disconnect power to unit using disconnect switch.
Check and clear obstructions in gravity lines leading to condensate pump.
Remove sump and clean with a stiff nylon brush and flush with water.
Inspect and clear clogs in discharge check valve and float mechanism.
Reassemble and check for leaks.

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
The Liebert iCOM microprocessor does not isolate power from the unit, even in the Unit Off
mode. Some internal components require and receive power even during the unit off mode of
the Liebert iCOM control.

12.8 Facility Fluid and Piping Maintenance

Facility water and glycol quality remain a requirement throughout the life of the piping system. Fluid
and piping system maintenance schedules must be established and performed. A local fluid
maintenance program must be established that will evaluate fluid chemistry and apply necessary
treatment.
A periodic leak inspection of facility and unit fluid piping is recommended. Refer to 7.2.1 -
Requirements of Systems Using Water or Glycol.

Liebert CW 116
 Maintenance

12.9 HVAC Maintenance Checklist

Inspection Date Job Name
Indoor Unit Model # Indoor Unit Serial Number #
Room Temperature/Humidity % Ambient Temperature

Filters
___ 1. Check/replace filters
___ 2. Grille area unrestricted
___ 3. Wipe section clean
___ 4. Coil clean

Blower Section
___ 1. Blower wheels free of debris
___ 2. Check belt tension and condition on centrifugal blower units (replace if needed)
___ 3. Check bearings
___ 4. Check sheave/pulley on centrifugal blower units (replace if worn)
___ 5. Check motor mount
___ 6. Motor amp draw L1__________________ L2 __________________ L3______________
____ Compare to nameplate amps

Reheat
___ 1. Inspect elements
___ 2. Check wire connections (inside reheat box)
___ 3. Reheat amp draw
___ a. #1
___ a. #2
___ a. #3

Steam Generating Humidifier

___ 1. Check drain valve/drain lines/trap for clogs
___ 2. Check water make-up valve and all hoses for leaks
___ 3. Clean strainer
___ 4. Replace humidifier bottle if necessary
___ 5. Check operation of humidifier
___ 6. Humidifier amp draw L1 ______________ L2 _______________L3__________________

Infrared Humidifier
___ 1. Check drain lines and trap for clogs
___ 2. Check/clean pan for mineral deposits
___ 3. Clean reflector
___ 4. Check water make-up valve for leaks
___ 5. Check humidifier lamps (replace if burnt out)
___ 6. Check wire connections (inside humidifier box)
___ 7. Humidifier amp draw L1 ______________ L2 _______________L3__________________

117 Liebert CW
 Maintenance

Drain Piping
___ 1. Check for free running drain system
___ 2. Clear out obstructions and material buildup on tubing walls
___ 3. Check for leaks
___ 4. Check for tubing kinks or damage

Condensate Pump
___ 1. Check for debris in sump
___ 2. Check operation of float(s) (free movement)

Electrical Panel
___ 1. Check fuses
___ 2. Check contactors for pitting
___ 3. Check wire connections

Controls
___ 1. Check/Verify Control Operation (Sequence)
___ 2. Check humidifier high-water alarm operation
___ 3. Check operation of the air safety switch
___ 4. Check setting/operation of the filter clog switch
___ 5. Check/test changeover device(s)
___ 6. Check/test water detection device(s)
Notes _______________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
Signature ___________________________________________________________________________________
Company ____________________________________________________________________________________
Make photocopies for your records. Compare readings / information to previous maintenance
worksheet. To locate your local Emerson representative for Liebert-engineered parts, check the
Liebert Web site: www.liebert.com or call 1-800-LIEBERT.

Liebert CW 118
 Installing Liebert CW300 and Liebert CW400

APPENDIX A - INSTALLING LIEBERT CW300 AND LIEBERT CW400

Liebert CW300 and Liebert CW400 models ship in multiple components that must be assembled in
the field. These components include the front and rear modules, filter plenum and optional floor
stands. Follow all instructions to reduce the risk of damage to property, personnel and equipment.
This appendix is to be used only in conjunction with the preceding portions of this user manual.

! WARNING
Risk of electric shock. Can cause injury or death. Disconnect all local and remote electrical
power supplies before working within the unit.
Only properly trained and qualified personnel should install or perform service on these units.
Lethal voltage is present in some circuits. Use caution when troubleshooting with power On.
Disconnect and lock out power before replacing components. Use caution and standard
procedures when working with pressurized pipes and tubes.

! WARNING
Risk of mishandling heavy fan assembly(s) and plenum. Can cause equipment damage, injury
or death. Attach the fan assembly(s) and plenum to the unit only as described in these
instructions.

! CAUTION
Risk of sharp edges and heavy parts. Can cause injury and equipment damage.
A minimum of two properly trained and qualified personnel are required to install the fan
assembly(s) and plenum.
Wear OSHA approved safety headgear, gloves, shoes, and glasses when installing the fan
assembly(s) and plenum.
Equipment used in handling/lifting, and/or installing the fan assembly(s) and plenum must
meet OSHA requirements. Use handling/lifting equipment rated for the weight of the fan
assembly(s) and plenum. Use ladders rated for the weight of the fan assembly(s) and plenum
and technicians if used during installation.
Refer to handling/lifting, and/or installation equipment operating manual for manufacturer's
safety requirements and operating procedures.
Refer to Table 18 for component weights, and to Table 19 for required parts common to
installation of any Liebert CW300 or Liebert CW400 unit.
Table 18 Liebert CW300 and Liebert CW400 component parts and weights
Component Part Number Weight, lb (kg)
CW300 Front Module CW30ADC_ _ 1 _ _ _ _ 2900 (1315)
CW300 Rear Module CW30BDC_ _ 1 _ _ _ _ 2900 (1315)
CW400 Front Module CW40ADC_ _ 1 _ _ _ _ 2900 (1315)
CW400 Rear Module CW40BDC_ _ 1 _ _ _ _ 2900 (1315)
Floor Stand24" Tall
Complete Assembly Part # 304394G24 800 (363)
Rear Subassembly Part # 304394G24R 400 (181)
Front Subassembly Part # 304394G24F 400 (181)
Floor Stand30" Tall
Complete Assembly 304394G30 900 (408.)
Rear Subassembly 304394G30R 450 (204)
Front Subassembly 304394G30F 450 (204)
Floor Stand36" Tall
Complete Assembly 304394G36 1000 (453)
Rear Subassembly 304394G36R 500 (227)
Front Subassembly 304394G36F 500 (227)

119 Liebert CW
 Installing Liebert CW300 and Liebert CW400

Table 19 Table 2 - Liebert CW300 and Liebert CW400 Assembly Parts

Component Part Number QTY
Parts for Securing Front and Rear Floor Stand
Washer, Plain Flat 5/16 S12-1300 4
Screw, 5/16-18 x 1.50 Fb Cash D2 195508P1 4
Parts for Securing Front and Rear Frame
Washer, Plain Flat 5/16 S12-1300 11
Washer, Lock Z Extern Tooth 5/16" S-1110 11
Screw, 5/16-18 x 1.00 Bhscs Zb 195577P1 11
Parts for Securing Front and Rear Fan Decks
Screw, 5/16-18 x 1.50 Fb Cash D2 195508P1 3
Washer, Lock Z Extern Tooth 5/16" S-1110 3

A.1 EQUIPMENT INSPECTION AND HANDLING

The Liebert CW300 and Liebert CW400 front and rear modules are packaged in the same manner as
all other Liebert CW units. See 4.0 - Equipment Inspection and Handling for details about
unpacking, inspecting and handling the modules.

A.2 LIEBERT CW300 AND LIEBERT CW400 INSTALLATION PREPARATION

1. Move the Liebert CW to its installation location and unpack the components.
2. Verify that the fan motors voltage rating is appropriate for the marked unit voltage rating.

A.3 LIEBERT CW300 AND LIEBERT CW400 INSTALLATION PROCEDURES

1. If included on order, install the floor stand for the rear section of the unit.
2. Refer to Table 18 to verify that the correct floor stand component is being installed.
3. Verify that the floor stand is in the correct position and that the uppermost horizontal surface is
level in all directions.
4. Adjust legs to achieve uniform level across all directions if not level.
5. Remove side panels of rear module.
6. Refer to Table 18 to verify that the correct module is being installed.
7. Install rear section of cabinet on the floor stand.
Do not remove the rear panel if there will be no access for re-installation after the rear module
has been placed on the floor stand.
8. Secure the rear module to rear floor stand using the procedures shown in this section of manual.
Figure 93 shows rear unit and rear floor stand after completion of this step. Some components are
removed for clarity.

Liebert CW 120
 Installing Liebert CW300 and Liebert CW400

Figure 93 Rear floor stand and rear unit mounted on floor stand

Rear Floor Stand

Rear Unit Mounted on Floor Stand

9. If unit application calls for EC fans to be lowered, lower the EC fans in the rear unit as detailed in
5.1 - Lowering and Removing EC FansDownflow Units Only.

NOTICE
Risk of improperly lowering fans. Can cause damage to the Liebert CW. All instructions in
5.1 - Lowering and Removing EC FansDownflow Units Only must be followed when
lowering the EC fans to prevent damage.

NOTE
The Liebert CW300 and Liebert CW400 rear floor stand employ a lengthwise channel for
mounting of the jack that differs from other Liebert CW units. Figure 94 shows this channel.
All other instructions are the same as in 5.1 - Lowering and Removing EC Fans
Downflow Units Only.

Figure 94 Rear floor stand jack

Floor Stand
Jack Handle

Floor Stand Jack

10. 4.Install front floor stand.

a. Verify that the floor stand is in the correct position and that the uppermost horizontal surface
is level in all directions.
b. Adjust legs to achieve uniform level across all directions if not level.
c. Secure the front and rear floor stand section with the provided bolts.
The bolts are to be installed as shown in Figure 95.

121 Liebert CW
 Installing Liebert CW300 and Liebert CW400

Figure 95 Floor stand bolt locations

Floor Stand Bolt
Locations

Floor Stand
Bolt Locations

11. Remove the front module panels and field service plates that are bolted under the front panels.
12. Install the front section of cabinet on the front floor stand.
13. Secure the front and rear unit modules together with the provided bolts, nuts and washers in the
locations shown in Figure 96.
Figure 96 shows installation on the right (non-valve) side, but bolt locations are typical for both
sides.

Figure 96 Module bolt locations

Bolt Connection Point

(Typical of both sides)

Bolt Connection Point

(Typical of both sides)

Rear of Liebert CW

Right Side of Liebert CW

Liebert CW 122
 Installing Liebert CW300 and Liebert CW400

14. 6.Lower the front module EC fans as detailed in 5.1 - Lowering and Removing EC Fans
Downflow Units Only.

NOTICE
Risk of improperly lowering fans. Can cause damage to the Liebert CW. All instructions in
must be followed when lowering the EC fans to prevent damage.

NOTE
The Liebert CW300 and Liebert CW400 rear floor stand employ a lengthwise channel for
mounting of the jack that differs from other Liebert CW units. Figure 94 shows this channel.
All other instructions are the same as in 5.1 - Lowering and Removing EC Fans
Downflow Units Only.

15. After the fans have been lowered, secure the front and rear module fan decks together with the
provided nuts, bolts and washers.
If the site-specific application requires that the EC fans be employed inside the unit, the fans
should be raised before proceeding. To do so, reverse the order of instructions 5.1 - Lowering
and Removing EC FansDownflow Units Only.

Figure 97 Fan deck bolt locations

Fan Deck Bolt

Locations

16. Connect the fan wire harnesses for the rear module to terminals in the junction box behind the
piping in the left rear of the front unit. The wires are marked with hot stamps matching labels in
the junction box. Figure 98 shows a detail of the wire harness routing point and the junction box
location. Figure 99 shows a detail of the junction box and the termination locations.

123 Liebert CW
 Installing Liebert CW300 and Liebert CW400

Figure 98 Wire harness routing point

Wire Harness
Routing Point

Junction Box

Liebert CW 124
 Installing Liebert CW300 and Liebert CW400

Figure 99 Wire harness junction box detail

Low-Voltage High-Voltage
Connection Connection
Entrance Entrance

Low-Voltage
Terminal
Strips

High-Voltage
Motor Terminal
Strips

High-Voltage THD and

Condensate Pump
Terminal Strips

17. Route the wire harness from the valve actuators and in the rear unit through hole provided for
harnesses to the harness on the valve actuator in the front unit and plug the harness in.
18. The remaining standard installation instructions for a CW181 apply for the wiring and piping
connections; refer to 6.0 - Electrical Connections and 7.0 - Piping.

125 Liebert CW
 Installing Liebert CW300 and Liebert CW400

Notes

Liebert CW 126
COMPLIANCE WITH EUROPEAN UNION DIRECTIVES

Liebert Corporation
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
USA

Il Produttore dichiara che, se munito di marchio CE, il prodotto conforme alle direttive dell'Unione
europea:
The Manufacturer hereby declares that this product, when bearing the CE mark, conforms to the
European Union directives:
Der Hersteller erklrt hiermit, dass das vorliegende Produkt, sollte es die CE-Kennzeichnung tragen, den
folgenden Richtlinien der Europischen Union entspricht:
Le fabricant dclare par la prsente que ce produit, portant la marque CE, est conforme aux directives
de l'Union europenne :
El fabricante declara por la presente que si este producto lleva el marcado CE es conforme con las
directivas de la Unin Europea:
O fabricante declara por este meio que este produto, quando ostenta a marca CE, est em
conformidade com as directivas da Unio Europeia:
Tillverkaren tillknnager hrmed att den hr produkten, nr den r CE-mrkt, verensstmmer med
EU:s direktiv:
De fabrikant verklaart hierbij dat dit product, indien het van de CE-markering is voorzien, conform de
EU-richtlijnen is:
Valmistaja vakuuttaa tten, ett mikli tuotteessa on CE-merkint, se tytt seuraavien EU-direktiivien
vaatimukset:
Produsenten erklrer herved at dette produktet, nr det er CE-merket, er i samsvar med EU-direktiver:
Producenten erklrer hermed, at dette produkt overholder EU's direktiver, nr det brer CE-mrket:
, CE,
..:
2006/42/EC; 2004/108/EC; 2006/95/EC; 97/23/EC
 Ensuring The High Availability
Of Mission-Critical Data And Applications.

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is the global leader in enabling Business-Critical Continuity Web Site
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Outside North America: +00800 1155 4499
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and completeness of this literature, Liebert Corporation assumes no Asia
responsibility and disclaims all liability for damages resulting from use of
this information or for any errors or omissions.
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