WCS Series 50Hz

Water Cooled Scroll Direct Expansion Chillers

Cooling Capacity: 12 to 53 TR (42 to 186 kW)

R407C

Products that perform...By people who care

TABLE OF CONTENTS

Page No Page No
Nomenclature ...................................................................... 2 Dimensional Data ............................................................... 6
Standard Features .............................................................. 2 Pressure Drop ..................................................................... 7
Operating Benefits .............................................................. 3 Floor Loading Diagram ........................................................ 9
System Control .................................................................... 4 Sound Pressure Data .......................................................... 9
Physical Specifications ........................................................ 5 Electrical Data ..................................................................... 9
Performance Data ............................................................... 5 Typical Wiring Diagram ..................................................... 10

NOMENCLATURE

WC S 12 - 5 S P

Water Cooled DX Blank = R22

Packaged Chiller P= R407C

S - Standard
Scroll Compressor Q - Special

5 - 50Hz
Nominal TR 6 - 60Hz

STANDARD FEATURES
Size Range D Approval Stamp available from JKKP
(Malaysia), UDT (Poland), BPA, China State
D 8 models from 12 to 53 TR [42 to 186 kW].
Bureau of Quality and Technical Supervision of
D Standard version available.
the People’s Republic of China and ASME.
D Rated with R407C. Consult factory for use of
D 1”[25mm] thick PE foam closed cell insulation.
other HFC refrigerants.

Compressor Condenser
D Vessels constructed in accordance to ASME
D Scroll hermetic type operating at 2950 RPM CODES Sections Vlll Division I for unfired
(50Hz). pressure vessels.
D High EER, low sound power level and high D Removable heads and interchangeable end-
reliability. for-end for job flexibility.
D Controlled orbit with floating seals and D 3/4”[19mm] OD seamless, extended surface
advanced scroll geometry. copper tubes.
D No-contact scroll design and 100% motor D 300psig [21bar] on refrigerant side design
cooled by suction gas. pressure.
D Thermostat fitted to prevent thermal overload. D 150psig [10bar] on water side design pressure.
D Capability of 50% tandem unloading. D Approval Stamp available from JKKP
(Malaysia), UDT (Poland), BPA, China State
Evaporator Bureau of Quality and Technical Supervision of
D Vessels constructed in accordance to ASME the People’s Republic of China and ASME.
CODES Sections Vlll Division I for unfired
pressure vessels. Electrical/Control
D Dunham-Bush high efficiency inner-fin tubes D Reliable microprocessor based controller with
design for compactness and weight reduction. electromechanical system is standard for all
D 250psig [17bar] on refrigerant side design models.
pressure. D Chilled water pump control.
D 150psig [10bar] on water side design pressure.

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OPERATING BENEFITS

FIGURE 1 : SCROLL COMPRESSOR

1. DELIVERING THE 3. DELIVERING THE INDUSTRY’S

HIGHEST EFFICIENCY BEST VALUE
Scroll compressor gives Scroll compressor clearly delivers
efficiencies 10% higher more system value because of its
than any competitive high efficiency, fewer required
compressor on the market components, increased reliability
today – at the right and quieter operation.
conditions.

4. DELIVERING FOR THE

2. DELIVERING THE FUTURE
QUIETEST OPERATION Scroll compressor is by far the
Scroll technology gives most advanced products in the
you compressor operation industry today for air
that is many times quieter conditioning, refrigeration and
than other technologies. heat pump applications.

FIGURE 2: PRINCIPLE OF SCROLL COMPRESSION

The scroll is a simple compression concept first the two scrolls while simultaneously being
patented in 1905. A scroll is an involute spiral reduced in volume. When the pocket reaches the
which, when matched with a mating scroll form as center of the scroll form, the gas, which is now at
shown above, generates a series of crescent- a high pressure, is discharged out of a port
shaped gas pockets between the two members. located at the center. During compression,
During compression, one scroll remains stationary several pockets are being compressed
(fixed-scroll) while the other form (orbiting scroll) simultaneously, resulting in a very smooth
is allowed to orbit (but not rotate) around the first process. Both the suction process (outer portion
form. As this motion occurs, the pockets between of the scroll members) and the discharge process
the two forms are slowly pushed to the center of (inner portion) are continuous.

Compression in the scroll is created by The open passages As the spiral continues to
the interaction of an orbiting spiral and are sealed off as gas is orbit, the gas is compressed
a stationary spiral. Gas enters the outer drawn into the spiral. into two increasingly smaller
openings as one of the spirals orbits. pockets.

By the time the Actually, during operation,

gas arrives at all six gas passages are in
the center port, various stages of
discharge compression at all times,
pressure has resulting in nearly
been reached. continuous suction and
discharge.

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SYSTEM CONTROL

CAPACITY CONTROL
The standard system capacity control operates as follows:
D As the chiller load initially drops, the suction of the compressor(s) starts dropping proportionately, thus
balancing minor load variations.
D Variation of unit capacity in response to system load requirements is controlled by an operating
thermostat, which monitors the return water temperature.
D On multiple compressor units, capacity is controlled by compressor staging.

ELECTRICAL CONTROLS
MCCB/ MCB - Main Circuit Breaker
This is an automatic, calibrated, ambient compensated, magnetic trip circuit breaker, which provides both
direct line-break compressor branch circuit. short circuit locked rotor and overload protection. It has a
manually operable handle for compressor circuit disconnect.

M- Contactor
The Contactor, operated by the control circuit, provides power individually to the compressors.
Contactors are used in single across-the-line start. This device is amp rated to handle both rated load
amp and locked rotor amps.

CR - Relays (Miscellaneous Control)

These relays provide the necessary circuit logic for lock-in, lock -out and control functions.

HTR - Crankcase Heater

Energized continuously as long as control circuit power disconnect switch (not supplied with the unit) is
closed and compressor is off. This heater maintains crankcase temperature above the system
temperature during the compressor off cycle, preventing refrigerant migration into the crankcase and
consequent cause compressor damage.

SOL - Liquid Line Solenoid Valve

Closes when the compressor(s) is off to prevent any liquid refrigerant from accumulating in the chiller
during the off cycle.

OL - Motor Overload (Manual Reset)

The compressors are protected by thermal overload relays. The overload relays are manually reset.

PCR or UVR - Phase Control Relay (Optional)

Protects the unit from the following electric supply malfunctions: Under voltage, phase reversal, phase
loss and phase imbalance. If the PCR or UVR trips, a control relay will de-energize and open the control
circuit. A red LED trip light, located on the PCR or UVR, will indicate a supply malfunction. Tile PCR or
UVR is a Auto reset control device.

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PHYSICAL SPECIFICATIONS
Model WCS 12-5SP 17-5SP 20-5SP 25-5SP 30-5SP 35-5SP 40-5SP 50-5SP
Unit Nominal Capacity TR[kW] 12[42] 18[63] 22[77] 26[91] 31[109] 36[127] 43[151] 53[186]
Unit Nominal Power Input kW 10 15 17 21 25 29 35 43
COMPRESSOR
Compressors Type (Qty) Single (2) Single (2) Single (2) Single (2) Single (1) Tandem (2) Tandem (2) Tandem (2)
Tandem (1)
% Step Capacity 0, 50, 100 0, 50, 100 0, 50, 100 0, 50, 100 0,25,50,75,100 0,25,50,75,100 0,25,50,75,100 0,25,50,75,100
EVAPORATOR
Model CHD006481A CHD06601B CHD007481A CHD007601B CHD008601A CHD008601A CHD010601A CHD011601B
Water Volume USGal[Liters] 3.7[14.0] 3.9[14.8] 4.5[17.1] 5.5[20.8] 8.1[30.7] 8.1[30.7] 10.7[40.6] 12.9[48.9]
Minimum Flow Rate USgpm[m³/hr] 19.4[4.4] 29.1[6.6] 37.2[8.4] 37.3[8.5] 55.9[12.7] 55.9[12.7] 62.1[14.1] 85.4[19.4]
Maximum Flow Rate USgpm[m³/hr] 62.7[14.2] 94.7[21.5] 101.7[23.1] 116.2[26.4] 168.3[38.2] 168.3[38.2] 206.0[46.8] 304.7[69.2]
Pressure Drop ft.wg[kPa] 11.8[35.3] 10.6[31.7] 10.6[31.7] 8.3[24.8] 9.9[29.6] 13.1[39.1] 13.4[40.1] 9.7[29.0]
Water Conn. Size inches[mm] 3[76]MPT 3[76]MPT 3[76]MPT 3[76]MPT 3[76]MPT 3[76]MPT 4[102]MPT 4[102]MPT
CONDENSER
Model CDS06D080 CDS06D080 CDS06D080 CDS08D080 CDS08D080 CDS08D080 CDS10D080 CDS10D080
ART ART BRT ART BRT CRT ART BRT
Water Volume USGal[Liters] 2.5[9.5] 2.8[10.6] 3.3[12.5] 4.6[17.4] 4.9[18.6] 5.6[21.2] 7.7[29.2] 8.9[33.7]
Minimum Flow Rate USgpm[m³/hr] 19.0[4.3] 19.0[4.3] 23.0[5.2] 29.3[6.7] 33.3[7.6] 38.0[8.6] 48.4[11.0] 58.7[13.3]
Maximum Flow Rate USgpm[m³/hr] 76.1[17.3] 76.1[17.3] 91.9[20.9] 117.3[26.6] 133.2[30.2] 152.2[34.5] 193.4[43.9] 234.6[53.3]
Pressure Drop ft.wg[kPa] 3.9[11.7] 8.3[24.8] 7.6[22.7] 8.1[24.2] 9.2[27.5] 10.6[31.7] 6.2[18.5] 6.9[20.6]
Water Conn. Size inches[mm] 2[51]MPT 2[51]MPT 2[51]MPT 2.5[64]MPT 2.5[64]MPT 2.5[64]MPT 4[102]MPT 4[102]MPT
ELECTRICAL
Compressor (Each): RLA 10.5 14 15.5 19 12 14 15.5 19
LRA 100 128 168 189 124 128 158 189
Unit Data : RLA 11 28 31 38 48 56 62 76
MCA 24 32 35 43 51 60 66 81
MFS 40 50 50 60 70 80 80 100
GENERAL
Unit Length inches[mm] 92 1/2[2350] 92 1/2[2350] 92 1/2[2350] 92 1/2[2350] 92 1/2[2350] 92 1/2[2350] 94[2388] 94[2388]
Unit Width inches[mm] 24[610] 24[610] 24[610] 24[610] 34[864] 34[864] 35[889] 35[889]
Unit Height inches[mm] 59 1/4[1505] 59 1/4[1505] 60 1/2[1537] 63[1600] 56 5/8[1438] 56 5/8[1438] 59 7/8[1521] 61[1549]
Unit Shipping Weight lbs[kg] 1345[610] 1372[622] 1448[657] 1677[761] 2125[964] 2414[1095] 2896[1314] 3216[1459]
Unit Operating Weight lbs[kg] 1407[638] 1432[650] 1520[689] 1771[803] 2236[1014] 2532[1149] 3054[1385] 3403[1544]
Refrigerant Charge, R407C lbs[kg] 26[12] 37[17] 45[20] 55[25] 63[29] 75[34] 94[43] 110[50]
Legend: RLA - Rated Load Amps LRA - Locked Rotor Amps MCA - Minimum Circuit Ampacity MFS - Maximum Fuse Size
Note: Nominal capacity is based on evaporator LWT 44°F and condenser EWT 85°F, actual capacity depends on the specified operating conditions.

PERFORMANCE DATA
Leaving Chilled Condenser Water Entering Temp. °F
Model
Water Temp. 75 85 95
WCS
°F TR kWI TR kWI TR kWI
42 12.5 8.8 11.7 10.0 10.8 11.3
44 13.0 8.8 12.2 10.0 11.3 11.2
12-5SP 46 13.6 8.8 12.7 9.9 11.8 11.2
48 14.2 8.8 13.3 9.9 12.3 11.2
50 14.8 8.8 13.8 9.9 12.9 11.2
42 17.8 12.4 16.6 14.5 15.5 15.9
44 18.6 12.4 17.9 14.5 16.2 15.9
17-5SP 46 19.4 12.3 18.3 14.5 16.9 15.9
48 20.2 12.3 18.9 14.5 17.6 15.8
50 21.1 12.3 19.8 14.4 18.4 15.8
42 22.0 15.5 20.6 17.3 19.1 19.5
44 23.0 15.5 21.5 17.4 20.0 19.6
20-5SP 46 24.0 15.6 22.5 17.4 20.9 19.6
48 25.1 15.7 23.4 17.5 21.8 19.6
50 26.1 15.7 24.5 17.5 22.7 19.7
42 27.0 19.0 25.3 21.4 23.6 24.2
44 28.1 19.0 26.4 21.4 24.6 24.1
25-5SP 46 29.3 19.0 27.6 21.3 25.7 24.1
48 30.6 18.9 28.7 21.3 26.9 24.0
50 31.9 18.9 30.0 21.2 28.0 24.0
42 31.3 21.9 29.3 25.2 27.3 28.0
44 32.7 21.8 31.1 25.2 28.5 27.9
30-5SP 46 34.1 21.8 32.1 25.1 29.7 27.9
48 35.5 21.8 33.3 25.1 31.1 27.8
50 37.0 21.7 34.7 25.0 32.4 27.8
42 35.6 24.7 33.3 29.0 30.9 31.8
44 37.2 24.7 35.8 29.0 32.3 31.7
35-5SP 46 38.8 24.7 36.6 29.0 33.8 31.7
48 40.5 24.6 37.9 28.9 35.2 31.6
50 42.2 24.6 39.5 28.8 36.8 31.6
42 44.1 30.9 41.2 34.7 38.3 39.0
44 46.0 31.0 43.0 34.7 40.0 39.1
40-5SP 46 48.0 31.2 44.9 34.8 41.7 39.2
48 50.1 31.3 46.9 34.9 43.6 39.2
50 52.3 31.4 48.9 35.0 45.5 39.3
42 53.9 38.0 50.6 42.8 47.2 48.3
44 56.3 38.0 52.8 42.7 49.3 48.2
50-5SP 46 58.7 37.9 55.1 42.6 51.5 48.1
48 61.2 37.9 57.5 42.6 53.7 48.0
50 63.8 37.8 59.9 42.5 56.0 47.9

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DIMENSIONAL DATA

WCS 12-5SP, 17-5SP, 20-5SP, 25-5SP

MODEL WCS A B C D H
WCS 12-5SP 56 [1422] 20 [508] 17 [432] 7 13/16 [198] 59 1/4 [1505]
WCS 17-5SP 56 [1422] 20 [508] 17 [432] 7 13/16 [198] 59 1/4 [1505]
WCS 20-5SP 56 1/8 [1426] 21 3/16 [538] 18 3/16 [462] 8 7/16 [214] 60 1/2 [1537]
WCS 25-5SP 56 1/8 [1426] 22 7/16 [570] 19 [483] 8 7/16 [214] 62 1/2 [1588]

WCS 30-5SP

WCS 35-5SP, 40-5SP, 50-5SP

MODEL A B C D E F H L W
WCS 35-5SP 30 [762] 23 1/2 [597] 20 [508] 9 [229] 3 [76] 2 [51] 54 5/8 [1387] 92 1/2 [2350] 34 [864]
WCS 40-5SP 31 [787] 27 [686] 21 [533] 9 9/16 [243] 4 [102] 4 [102] 58 5/8 [1489] 94 1/4 [2394] 35 [889]
WCS 50-5SP 31 [787] 28 1/8 [727] 22 1/8 [575] 10 1/8 [257] 4 [102] 4 [102] 59 3/4 [1518] 94 1/4 [2394] 35 [889]

Notes: 1.) Water piping to be support to minimize load on unit. 5.) Sufficient room must be allowed for evaporator and condenser water
2.) All dimensions are in inches[mm]. connection.
3.) Vent and drain connections provided on evaporator and condenser. 6.) Dimension do not include evaporator insulation.
4.) Spring isolators are optional. If spring isolators are installed, flexible 7.) Tolerance for all dimension ±0.5 inches [±12.7mm].
connection shall be used to provide isolation in condenser water and 8.) Compressor layout shown in this drawing are typical type and layout
chilled water pipes. varied depend on the model.

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PRESSURE DROP

IMPERIAL UNITS
EVAPORATOR
100

WCS 12-5SP
WCS 17-5SP
WCS 20-5SP
PRESSURE DROP - ft.wg

WCS 25-5SP

WCS 30-5SP
WCS 35-5SP
WCS 40-5SP
WCS 50-5SP

10
10 100 1000

WATER FLOW RATE - USgpm

CONDENSER

100

WCS 12-5SP
PRESSURE DROP - ft.wg

WCS 17-5SP
WCS 20-5SP
WCS 25-5SP
10

WCS 30-5SP
WCS 35-5SP
WCS 40-5SP
WCS 50-5SP

1
10 100 1000

WATER FLOW RATE - USgpm

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PRESSURE DROP

S.I. UNITS
EVAPORATOR
1000

WCS 12-5SP
PRESSURE DROP - kPa

WCS 17-5SP
WCS 20-5SP
100
WCS 25-5SP

WCS 30-5SP
WCS 35-5SP
WCS 40-5SP
WCS 50-5SP

10
1 10 100

WATER FLOW RATE - m³/hr

CONDENSER

100

WCS 12-5SP
WCS 17-5SP
WCS 20-5SP
WCS 25-5SP
PRESSURE DROP - kPa

WCS 30-5SP
WCS 35-5SP
10 WCS 40-5SP
WCS 50-5SP

1
1 10 100

WATER FLOW RATE - m³/hr

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FLOOR LOADING DIAGRAM
L

POINT LOAD LOCATION AND DATA

Model Dimensions - inches[mm] Loads – lbs[kg] Total Operating
WCS L W A B C D Weight – lbs[kg]

12-5SP 92 1/2 [2350] 24 [610] 410 [186] 410 [186] 327 [148] 327 [148] 1474 [669]
17-5SP 92 1/2 [2350] 24 [610] 421 [191] 421 [191] 338 [153] 338 [153] 1518 [689]
20-5SP 92 1/2 [2350] 24 [610] 458 [208] 458 [208] 356 [161] 356 [161] 1628 [738]
25-5SP 92 1/2 [2350] 24 [610] 539 [244] 539 [244] 421 [191] 421 [191] 1920 [871]
30-5SP 92 1/2 [2350] 34 [864] 617 [280] 562 [255] 561 [254] 616 [279] 2356 [1069]
35-5SP 94 [2388] 35 [889] 661 [300] 646 [293] 612 [278] 621 [282] 2540 [1152]
40-5SP 94 [2388] 35 [889] 836 [379] 794 [360] 794 [360] 843 [382] 3267 [1482]
50-5SP 94 [2388] 35 [889] 950 [431] 896 [406] 896 [406] 950 [431] 3692 [1675]

SOUND PRESSURE DATA

Model Octave Band (Hz) Total
WCS 63 125 250 500 1K 2K 4K 8K dB (A)

17-5SP 21 23 45 57 58 57 52 43 63
20-5SP 21 28 47 59 59 62 58 52 66
25-5SP 21 31 50 59 59 62 57 49 66
30-5SP 24 32 51 61 62 64 60 51 68
35-5SP 24 26 47 61 62 61 60 51 68
40-5SP 24 31 50 62 62 65 61 55 69
50-5SP 24 34 53 62 62 65 60 52 69
Note: Sound Pressure Level (Lp), dB(A) ± 2 dB @ 3.3ft [1m] Free Field.

ELECTRICAL DATA
Model Compressor Data Unit Electrical Data
WCS Model RLA LRA FLA MCA MFS
12-5SP ZR90K3, ZR90K3 11, 11 99, 99 22 25 35
17-5SP ZR12M3, ZR12M3 13, 13 127, 127 26 29 40
20-5SP ZR16M3, ZR16M3 15, 15 167, 167 30 34 45

25-5S[ ZR19M3, ZR19M3 19, 19 198, 198 38 43 60

ZZ19M3, ZZ19M3, 11, 11, 125, 125,

30-5SP 41 46 60
ZZ22M3 19 198
ZZ12M3, ZZ12M3, 13, 13, 127, 127,
35-5SP 52 55 60
ZZ12M3, ZZ12M3 13, 13 127, 127
ZZ16M3, ZZ16M3, 15, 15, 167, 167,
40-5SP 60 64 70
ZZ16M3, ZZ16M3 15, 15 167, 167
ZZ19M3, ZZ19M3, 19, 19, 198, 198,
50-5SP 76 81 90
ZZ19M3, ZZ19M3 19, 19 198, 198
Note: RLA - Rated Load Amps LRA - Locked Rotor Amps FLA – Full Load Amps
MCA - Minimum Circuit Ampacity MFS - Maximum Fuse Size

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TYPICAL WIRING DIAGRAM

2 SINGLE COMPRESSOR

- 10 -
TYPICAL WIRING DIAGRAM

2 TANDEM COMPRESSOR

- 11 -
Americas Europe Africa

United States of America United Kingdom South Africa

175 South Street, 8 Downley Road, No. 57 Sovereign Drive

West Hartford, Havant, Hampshire, Route 21 Corporate Park
CT 06110, USA England PO9 2JD Irene, Pretoria
South Africa
Tel: 1-860-249 8671 Tel : 44-23-9247 7700
Fax: 1-860-953 3300 Fax: 44-23-9245 0396 Tel: 27-12-345 4202
Fax: 27-12-345 4203

China Asia Middle East & North Africa

No. 1 Dunham-Bush Road, Singapore United Arab Emirates

Laishan District,
Yantai, 146B, Paya Lebar Road, Platinum Business Centre
Shandong Province, No. 05-01, Office No. 704
China 264003 ACE Building, P. O. Box 30922,
Singapore 409017 Al Nahda 2nd, Dubai, UAE
Tel: 86-535-658 8999
Fax: 86-535-658 1999 Tel: 65-6842 2012 Tel: 971-4-280 6699
Fax: 65-6842 2013 Fax: 971-4-280 9886

Russia & CIS India Malaysia

Russia 304 Sky Station, Lot 5755-6, Kidamai Industrial Park,

Plot No. 109, Bukit Angkat,
Lot 11, Novinskiy Boulevard, Viman Nagar, 43000 Kajang,
Moscow, Pune 411014, Selangor Darul Ehsan,
121099 Russian Federation India Malaysia

Tel: 7-499-255 6953 Tel: 91-20-4131 4682 Tel: 603-8924 9000

Fax: 7-499-255 6953 Fax: 91-20-4131 4683 Fax: 603-8739 5020

info@dunham-bush.com
www.dunham-bush.com Products that perform...By people who care

Manufacturer reserves the right to change specifications without prior notice. M-S-0485A-0211