Engineered for flexibility and performance.

TM
TM-MDS-2006

MULTI-DIGITAL SCROLL UNITS

MDS030A(R)~MDS60A(R)
MDS080B(R)~MDS300B(R)

page 2
Contents
General Features ............................................................................................................. 2

Nomenclature................................................................................................................... 4

Technical Parameter ........................................................................................................ 7

Outlines and Dimensions ............................................................................................. 11

Wiring Diagrams ............................................................................................................ 16

Installation...................................................................................................................... 30

Troubleshooting............................................................................................................. 41

Servicing and Maintenance .......................................................................................... 42

Note: Installation and maintenance are to be performed only by qualified personal who are
familiar with local codes and regulations, and experienced with this type of equipment.

Caution: Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them.

Warning: Moving machinery and electrical power hazards. May cause severe personal injury or death.
Disconnect and lock off power before servicing equipment.

“McQuay” is a registered trademark of McQuay International. All rights reserved throughout the world.

2003 McQuay International

“Bulletin illustrations cover the general appearance of McQuay International products at the time of publication
and we reserve the right to make changes in design and construction at any time without notice.”

page 1
1 General Features
1.1 Wide Range and Stepless Capacity Modulation
• Wide capacity modulation range (10%-100%)
• According to changing the ralio of “loading time” and “unloading time”. MDS can modulate the capacity
steplessly.
• Lower the energy consumption and running cosl.
Running ration of compressors %

MDS system

Inverter system

Total capacity of operating indoor units

1.2 Accurate Temperature Control and Quick Response

• The cooling/heating capacity of the indoor units is controlled by the EXV. which ensures the low theperature
fluctuation of 0.3 C. O

• Stepless capacity modulation.

• Ouick response to output the capcity (40s).

Temp. The temperature fluctuation range of traditional system is ±2°C The temperature fluctuation range of traditional system is ±0.5°C
Temp.
The temperature fluctuation range of MDS system is ±0.3°C The temperature fluctuation range of MDS system is ±0.3°C

Time Time

1.3 Simple, Reliable and Long Life

• The PWM valve has the longevity of 40 million times.
• Wide rage of capacity modulation makes sure the start/stop times reduces.
• Less components.
• No complicate inverter controller.
• The compress or has an excellent oil return performance, there is no need for the oil return circuit.
• Even the units run in 10% part load, the MDS system can be in good stage.

System control
Environment

Solenoid valve

Digital scroll

page 2
1.4 Energy Saving
The inverter system’s capacity modulation range is from 30% to 100%, while MDS system’s capacity
modulation range is from 10% to 100%.
Quick response to the capacity modulation.
Min. power consumption is only 10% of the full load power consumption.
Compared to the inverter system, there is no power consumption of transducer.
Compared to the nominal capacity scroll system, it can save 20% energy consumption.

10HP system
100%
EER

Digital
compressor
operating

Fixed
compressor
100% operating

10%
Traditional air Traditional inverter MDS system
conditioning system system Heavy loading Load Light loading

1.5 Flexible Combination of Indoor Units

The max. capacity of the indoor units is as 130% as the outdoor units capacity.
The outdoor units can connect different numbers of indoor units according to the outdoor units capacity.
One outdoor unit can be connected up to 48 indoor units.
Various types of indoor units are available.
There are various indoor units for option: concealed exposed, ceiling concealed, high static pressure fan coil
and ceiling exposed/floor standing.

1.6 Long Accessory Pipe Connection Design

Max. accessory pipe length is 15m (12HP-30HP), max. height is 50m (8HP—30HP).
Max. accessory pipe total Max. accessory pipe Height
length (m) length (m) OT IT
12-30HP 350 150 50 40
10HP 250 125 50 40
8HP 250 125 50 40
6HP 150 70 30 30
5HP 150 70 30 30
4HP 150 70 20 20
3HP 100 50 20 20

Note:
OT means the outdoor unit is above the indoor unit,
IT means the outdoor unit is below the indoor unit.

page 3
1.7 Space Saving
• Compared to scale size central air conditioning, MDS system is high centralized, no need for special
equipment room to save more space, and bring more benefits.

Traditional central air conditioning MDS system

1.8 Easy to Install and Simple to Maintain

Easy Installation
• MDS system is simple and reliable, and outdoor unit can be connected with several indoor units, so it is
easy for installation.
• MDS system can be installed by stages, which is good to both new projects and renovation projects.
• Compared to the chilled water system, MDS system is much simple and there is no need for expert
people to maintain it.
No Need for Special Maintenance
• It has only simple refrigerant piping system, no complex maintenance;
• Compared to the water-cooled system, MDS system is with no water system, no pipe cleaning, without
maintenance for water system control design; so MDS system is much simple and there is no need for
expert people to manage and maintain it.

page 4
Nomenclature

2.1 Indoor Unit: Ceiling Cassette

M CK 030 T -A M A

Design alteration No
Matching outdoor units: MDS series
Power supply feature: 220V~/50Hz
Design serial No.
Cooling capacity No.
Ceiling cassette indoor unit
McQuay

2.2 Indoor Unit: Ceiling Concealed

MCC 050 T -R (B)/(D) -A M A

Design serial No
Matching outdoor units:
MDS series
Power supply:
A: 220V~/50Hz
Return air mode: B-rear return air plenum
D-lower return air plenum
Omitted-no return air box
Type of connecting pipe: R- right connecting pipe L-left
connecting pipe
Design serial No.
Cooling capacity No.
McQuay ceiling concealed indoor unit

2.3 Indoor Unit: Air-cooled Chilled Air Duct

M DB 050 T -A M A

Design serial No.

Matching outdoor units: MDS series
Power supply feature: A is 220V~/50Hz
Series No.
Cooling capacity No.
Air-cooled chilled air duct
McQuay

2.4 Indoor Unit: Ceiling Exposed/Floor Standing

M CM 050 T -A M A

Design serial No.

Matching outdoor units: MDS series
Power supply feature: A is 220V~/50Hz
Series No.
Cooling capacity No.
Ceiling exposed/floor standing indoor unit
McQuay
page 5
2.5 Electric Heater Box
HD P 1.2 T 08-15

8-15 means it can be used in MCC008/010/015T

18-30 means it can be used in MCC018/020/025/030T
40 means it can be used in MCC040T
40-50 means it can be used in MCC040/050T
60 means it can be used in MCC060T
Applicable units: T means the unit can be used in MCC "T"
series
Heating capacity (kW)
Heating unit: P means the heating unit is PTC
Omitted means the heating unit is electric heating pipe
Electric heater box

2.6 Hot Water Heater Box

HW T 08-15

08-15 means it can be used in MCC008/010/015T

18-30 means it can be used in MCC018/020/025/030T
40-50 means it can be used in MCC040/050T
60 means it can be used in MCC060T
Applicable units: T means the unit can be used in MCC "T"
series
Hot water heater box

2.7 MDS Unit

MDS 060 A R- F AA

Description of the products

Power supply features: A: 220V~/50Hz
F: 380V/3N~/50Hz
Heat pump, omitted if cooling only unit
Design serial No.
Cooling capacity No.
McQuay MDS unit

MEX Throttle Box Nomenclature:

MEX - 14 - 2 SA - A

Design serial No.

Connecting pipe mode
Connecting pipe size
Valve opening size No.
Unit name No.

Unit name no. MEX: McQuay throttle box (one expansion valve)
Valve opening size no. 14: Nominal diameter value (mm)*10
Connecting pipe size 2: 1/4 inch
3: 3/8 inch
4: 1/2 inch
Connecting pipe mode SA: Flare fitting & nipple joint
Design serial no. A: Primary design

page 6
3 Technical Parameter
MDS030A(R)~MDS060A(R)
Model MDS030A MDS030AR MDS040A MDS040AR MDS050A MDS050AR MDS060A MDS060AR
Cooling(kW) 8.5 8.5 10.0 10.0 12.5 12.5 14.5 14.5
Heating(kW) - 9.0 - 11.5 - 13.5 - 16.5
Power 220V~/50Hz
Noise dB(A) 59 59 59 60
W×D×H(mm) 840×408×900 1058×430×1044 1058×430×1044 1058×430×1247
Weight(kg) 82 85 112 115 117 120 123 130
Power consumption in cooling(kW) 3.0 3.0 3.5 3.6 4.4 4.4 5.0 5.0
Ampere in cooling(A) 13.6 13.6 15.9 15.9 20 20 22.8 22.8
Power consumption in cooling(kW) - 2.5 - 3.4 - 4.2 - 4.2
Ampere in cooling(A) - 11.4 - 13.5 - 19 - 20.3
Refrigerant R22
Gas Flare fitting and nipple joint connecting
Connecting
Liquid Flare fitting and nipple joint connecting
LiquidΦ(mm(in)) 9.52(3/8) 9.52(3/8) 9.52(3/8) 9.52(3/8)
GasΦ(mm(in)) 15.88(5/8) 19.05(3/4) 19.05(3/4) 19.05(3/4)

Model MDS050A MDS050AR MDS060A MDS060AR

Cooling(kW) 12.5 12.5 15 15
Heating(kW) - 13.5 - 17
Power 380V/3N~/50Hz
Noise dB(A) 59 60
W×D×H(mm) 1058×430×1044 1058×430×1247
Weight(kg) 117 120 123 130
Power consumption in cooling(kW) 4.4 4.4 5.0 5.0
Ampere in cooling(A) 8.4 8.4 9.6 9.6
Power consumption in cooling(kW) - 4.2 - 4.23
Ampere in cooling(A) - 8.0 - 8.8
Refrigerant R22
Gas Flare fitting and nipple joint connecting
Connecting
Liquid Flare fitting and nipple joint connecting
LiquidΦ(mm(in)) 9.52(3/8)
GasΦ(mm(in)) 19.05(3/4)

MDS080B(R)~MDS300B(R)
Model MDS080B MDS080BR MDS100B MDS100BR MDS120B MDS120BR MDS150B MDS150BR
Cooling(kW) 24.5 24.5 28.0 28.0 32.5 32.5 40.0 40.0
Heating(kW) - 26.0 - 30.0 - 34.0 - 43.0
Power 380V/3N~/50Hz
Noise dB(A) 62 64 66 67
W×D×H(mm) 990×840×1840 1290×840×1840
Weight(kg) 275 290 285 300 290 305 355 370
Power consumption in cooling(kW) 7.5 7.5 8.5 8.5 9.8 9.8 12.9 12.9
Ampere in cooling (A) 14.6 14.6 16.8 16.8 18.8 18.8 23.1 23.1
Power consumption in cooling(kW) - 7.2 - 8.3 - 9.0 - 11.1
Ampere in cooling (A) - 13.6 - 15.7 - 16.7 - 22.6
Refrigerant R22
Gas Welding flange
Connecting
Liquid Expanded copper tube
LiquidΦ(mm(in)) 12.7(1/2) 15.88(5/8)
GasΦ(mm(in)) 28.6(1 1/8) 34.9(1 3/8)
Max. indoors-quantity 13 16 16 20

page 7
 Model MDS180B MDS180BR MDS200B MDS200BR MDS220B MDS220BR MDS240B MDS240BR
Cooling(kW) 47.5 47.5 50.0 50.0 55.0 55.0 65.0 65.0
Heating(kW) - 50.0 - 53.0 - 58.0 - 68.0
Power 380V/3N~/50Hz
Noise dB(A) 66 66 66 68
W×D×H(mm) 1990×840×1840
Weight (kg) 520 550 560 590 560 590 570 600
Power consumption in cooling(kW) 14.1 14.1 15.2 15.2 16.7 16.7 19.8 19.8
Ampere in cooling (A) 28.2 28.2 31.1 31.1 32.7 32.7 38.5 38.5
Power consumption in cooling(kW) - 13.2 - 14.7 - 16.2 - 18.5
Ampere in cooling(A) - 27.1 - 29.4 - 31.0 - 33.8
Refrigerant R22
Gas Welding flange
Connecting
Liquid Expanded copper tube
LiquidΦ(mm(in)) 15.88(5/8) 19.05(3/4)
GasΦ(mm(in)) 34.9(1 3/8) 38.1(1 1/2)
Max. indoors-quantity 24 24 24 24

Model MDS260B MDS260BR MDS280B MDS280BR MDS300B MDS300BR

Cooling(kW) 70.0 70.0 75.0 75.0 80.0 80.0
Heating(kW) - 75.0 - 80.0 - 85.0
Power 380V/3N~/50Hz
Noise dB(A) 68 69 69
W×D×H(mm) 2280×840×1840 2580×840×1840
Weight(kg) 645 675 710 740 710 740
Power consumption in cooling(kW) 21.3 21.3 22.8 22.8 26.2 26.2
Ampere in cooling(A) 40.0 40.0 42.5 42.5 46.5 46.5
Power consumption in cooling(kW) - 20.9 - 22.0 - 23.6
Ampere in cooling(A) - 37.2 - 41.0 - 43.1
Refrigerant R22
Gas Welding flange
Connecting
Liquid Expanded copper tube
LiquidΦ(mm(in)) 19.05(3/4)
GasΦ(mm(in)) 41.3(1 5/8)
Max. indoors-quantity 32 32 32

Notes:
1. Cooling condition: Indoor D/W bulb Temp. 27/19ºC, outdoor temperature: D/W bulb Temp. 35/24ºC.
2. Heating condition: Indoor D/W bulb Temp. 20/15ºC, outdoor temperature: D/W bulb Temp. 7/6ºC.

Ceiling Concealed Indoor Units

Model MCC008T MCC010T MCC015T MCC018T MCC020T
Cooling capacity(W) 2000 2500 3650 4500 5600
Heating capacity(W) 2200 2600 3700 4700 6100
Power 220V~/50Hz
Noise dB(A) 31 34 35
W×D×H(mm) 1030×469×220 1290×490×250
Weight(kg) 22 25
Power input(W) 47 81 82
Fan number 2
Air flow(H: m³/h) 450 580 800
ESP(Pa) 15(0/30/50)
DrainΦ(mm(in)) 19.05(3/4)
Protection Anti-freezing
Gas Expanded copper tube
Connection
Liquid Expanded copper tube
LiquidΦ(mm(in)) 6.35(1/4) 9.52(3/8)
GasΦ(mm(in)) 9.52(3/8) 12.7(1/2) 15.88(5/8)

page 8
 Model MCC025T MCC030T MCC040T MCC050T MCC060T
Cooling capacity(W) 6500 7800 10600 12400 14400
Heating capacity(W) 7400 8900 11600 14500 17300
Power 220V~/50Hz
Noise dB(A) 37 42 47 48
W×D×H(mm) 1290×490×250 1640×490×250 1900×490×250
Weight(kg) 27 28 39 45
Power input(W) 123 158 276 280
Fan number 2 3 4
Air flow(H : m³/h) 960 1200 1900 2100
ESP(Pa) 15(0/30/50) 30(15/50/70) 50(15/30/70)
DrainΦ(mm(in)) 19.05(3/4”)
Protection Anti-freezing
Gas Expanded copper tube
Connection
Liquid Expanded copper tube
LiquidΦ(mm(in)) 9.52(3/8”)
GasΦ(mm(in)) 15.88(5/8”) 19.05(3/4”)

Notes:
1. Cooling condition: Indoor D/W bulb Temp. 27/19ºC, outdoor temperature: D/W bulb Temp. 35/24ºC.
2. Heating condition: Indoor D/W bulb Temp. 20/15ºC, outdoor temperature: D/W bulb Temp. 7/6ºC.

Ceiling Duct Indoor Unit

Model MDB050T MDB060T
Cooling capacity(W) 12500 14000
Heating capacity(W) 14000 15500
Power 220V~/50Hz
Noise dB(A) 58 60
W×D×H(mm) 1230×910×350 1430×910×350
Weight(kg) 69 75
Power consumption(W) 615 790
Fan number 1
Air flow(H m³/h) 2250 3000
ESP(Pa) 100
DrainΦ(mm(in)) 19.05(3/4)
Protection Anti-freezing, overload
Gas Expanded copper tube
Connection
Liquid Expanded copper tube
LiquidΦ(mm(in)) 9.52(3/8)
GasΦ(mm(in)) 19.05(3/4)

Notes:
1. Cooling condition: Indoor D/W bulb Temp. 27/19ºC, outdoor temperature: D/W bulb Temp. 35/24ºC.
2. Heating condition: Indoor D/W bulb Temp. 20/15ºC, outdoor temperature: D/W bulb Temp. 7/6ºC.

Vertical Floor Standing & Horizontal Ceiling Mounted Indoor Unit

Model MCM020T MCM030T MCM050T
Cooling capacity(W) 5800 7500 12500
Heating capacity(W) 5800 8000 13500
Power 220V~/50Hz
Noise dB(A) 48 50 52
W×D×H(mm) 1214×670×214 1214×670×249 1714×670×249
Weight(kg) 39 44 44
Power consumption(W) 81 116 161
Number of fan 2 3 4
Air flow(H m³/h) 1100 1300 1850
DrainΦ(mm(in)) 20.5(4/5)
Protection Anti-freezing, overheat
Gas Expanded copper tube
Connection
Liquid Expanded copper tube
LiquidΦ(mm(in)) 9.52(3/8) 9.52(3/8)
GasΦ(mm(in)) 15.88(5/8) 19.05(3/4)

Notes:
1. Cooling condition: Indoor D/W bulb Temp. 27/19ºC, outdoor temperature: D/W bulb Temp. 35/24ºC.
2. Heating condition: Indoor D/W bulb Temp. 20/15ºC, outdoor temperature: D/W bulb Temp. 7/6ºC.

page 9
Ceiling Cassette Indoor Unit
Model MCK010T MCK015T MCK018T MCK020T MCK025T MCK030T MCK040T MCK050T
Cooling capacity(W) 2800 3600 4500 5400 6500 7500 10000 12500
Heating capacity(W) 3200 3900 5000 5900 7200 8000 11000 13500
Power 220V~/50Hz
Noise dB(A) 29 32 38 39 42 45 45 48
W×D×H(mm) 930×930×278 930×930×363
Weight(kg) 26 26 30 30 39.5 39.5 39.5 39.5
Power consumption(W) 26 34 36 42 72 84 110 140
Number of fan 1
Air flow(H m³/h) 520 600 650 700 1200 1300 1500 1650
DrainΦ(mm(in)) 20.5(4/5)
Protection Anti-freezing, overheat
Gas Expanded copper tube
Connection
Liquid Expanded copper tube
LiquidΦ(mm(in)) 6.35(1/4) 9.52(3/8) 9.52(3/8)
GasΦ(mm(in)) 9.52(3/8) 12.7(1/2) 15.88(5/8) 19.05(3/4)

Notes:
1. Cooling condition: Indoor D/W bulb Temp. 27/19ºC, outdoor temperature: D/W bulb Temp. 35/24ºC.
2. Heating condition: Indoor D/W bulb Temp. 20/15ºC, outdoor temperature: D/W bulb Temp. 7/6ºC.

Accessories: Heating Coil

Model HWT08-15 HWT18-30 HWT40-50 HWT60
Indoor unit MCC008T MCC010T MCC015T MCC018T MCC020T MCC025T MCC030T MCC040T MCC050T MCC060T
Heating(kW) 3600 3600 4200 6300 6300 7200 8000 12000 12000 13500
Water flow(m3/h) 0.31 0.31 0.36 0.54 0.54 0.60 0.67 0.99 0.99 1.11
Air pressure drop(Pa) 7 7 13 12 12 17 23 31 31 26
Water pressure drop(kPa) 2 2 3 6 6 7 9 11 11 17
Net weight(kg) 9.5 9.5 9.5 11 11 11 11 14 14 15
Rows 2 2 2 2 2 2 2 2 2 2

Note:
1. Testing condition: 60ºC entering water, 50ºC leaving water.

Accessories: Electrical Heater

Model Model of heater Capacity(kW) Power Ampere(A) Intersection surface(mm²)
HDP1.2T08-15 1.2 220V~/50Hz 5.5 1.5
MCC008T/010T/015T
HDP2.4T08-15 2.4 220V~/50Hz 11 2.5
HDP2.4T18-30 2.4 220V~/50Hz 11 2.5
MCC018T/020T/025T/030T
HDP3.6T18-30 3.6 220V~/50Hz 16.5 4
HDP2.4T40 2.4 220V~/50Hz 11 2.5
MCC040T
HDP3.6T40 3.6 220V~/50Hz 16.5 4
HDP4.8T40-50 4.8 380V/3N~/50Hz 10.5 2.5
MCC040T/050T
HDP7.2T40-50 7.2 380V/3N~/50Hz 16 4
HDP5.4T60 5.4 380V/3N~/50Hz 12 4
MCC060T HDP7.2T60 7.2 380V/3N~/50Hz 16 4
HDP10.8T60 10.8 380V/3N~/50Hz 23.5 4

Notes:
1. Electrical heater power shall be supplied independently, and intersection size shall meet the requirement
of cable.
2. Electrical heater shall fix with indoor units tightly.
3. To select the right fuse to couple with electrical heater.
4. Earth connecting is a must for electrical heater.

page 10
4 Outlines and Dimensions
4.1 Outlines & Dimension of Outdoor Unit

MDS030A(R)
Unit: mm
840
125 590

408
378

330
240
124
4-18x12

318
900

50
460

60 67
20

page 11
MDS040A(R)/MDS050A(R)/MDS060A(R) Unit: mm
Model H1 H2
MDS040A(R) 1024 1044
MDS050A(R) 1024 1044
MDS060A(R) 1222 1242

356

430
390

115
94

356

430
390

94 816

115
1006

94
94 816
1006
H1

H2
H1

H2
128

67
128

67

page 12
MDS080,100,120,150,180,200,220,240,260,280,300B(R) Unit: mm
Model A B Model A B Model C D
MDS080/100/120B(R)/ 120B(R)M 900 990 MDS150B(R)/130B(R)S/ 150B(R)M/150B(R)S 1200 1290 MDS180/200/220/ 240B(R) 950 1990

MDS260/280/300B(R)are combined units, made up by a master unit and a slave unit

Combined unit MDS260B(R) MDS280B(R) MDS300B(R)
Master unit + Slave unit MDS120B(R)M+MDS150B(R)S MDS150B(R)M+MDS130B(R)S MDS150B(R)M+MDS150B(R)S
D 990+10+1290 1290+10+1290 1290+10+1290

8- 14x20 Scre w hol e 14-1 4x20 S cr ew hol e

Deta il M
(f or s et tin g)
A

Detai l M
Screw Hole 1 4×20

B D

8- 14x20 Scre w hol e 14-1 4x20 S cr ew hol e

Deta il M
(f or s et tin g)
A

Detai l M
Screw Hole 1 4×20

B D

4.2 Outlines & Dimension of Indoor Unit

MCC008, 010, 015, 018, 020, 025, 030, 040, 050, 060T Unit: mm
Model A B C D E F G H I J No. of fans
MCC008T 690 722 1054 751 39 210 469 118 9 220 2
MCC010T 690 722 1054 751 39 210 469 118 9 220 2
MCC015T 690 722 1054 751 39 210 469 118 9 220 2
MCC018T 690 722 1054 751 39 210 469 118 9 220 2
MCC020T 950 981 1314 1005 32 248 490 81 14 251 2
MCC025T 950 981 1314 1005 32 248 490 81 14 251 2
MCC030T 950 981 1314 1005 32 248 490 81 14 251 2
MCC040T 1300 1331 1664 1355 32 248/ 490 21 14 251 3
MCC050T 1300 1331 1664 1355 32 248/ 490 21 14 251 3
MCC060T 1560 1591 1924 1615 32 248 490 81 14 251 4

page 13
MCK010,015,018,020,025,030,040,050T Unit: mm
Model A B C D E F G H I J K L M
MCK010/015/018/020T 820 875 548 820 278 250 28 930 930 642 622 555 555
MCK025/030/040/050T 820 875 548 820 363 335 28 930 930 642 622 555 555

MDB050, 060T Unit: mm

Model A B C D E F Gas pipe Liquid pipe
MDB050T 995 957 998 1032 1063 1230 Φ19.05 Φ9. 52
MDB060T 1195 1157 1198 1232 1263 1430 Φ19.05 Φ9. 52

page 14
MCM020, 030, 050T Unit: mm
Model A B C D E F G H J K L M N
MCM020T 1174 75 1082 68 58 156 1214 57 670 216 319 879 517
MCM030T 1174 75 1082 68 93 156 1214 57 670 216 319 879 517
MCM050T 1674 75 1582 68 93 156 1714 57 670 216 319 1379 517

page 15
5 Wiring Diagram
5.1 Wiring Diagram of Indoor Units

Model: MCC008/010/015/018/020/025/030/040/050/060T

SW-PB J1 LINE
KEY1

J6 J5 J4 HF LF J2
CON5

NEUTRAL
JP1 JP2

orange
brown
yellow
JP6 JP3

1
SW3 Transformer

ON
2

middle
SW1

low

high
3

Connecting indoor/outdoor

red
blue
SW2
units communication
CON2

ON

1 2 3 4 5 6

L N
DIP

LCD
TR1 TR2
CON4

ROOM

Wire controller
Indoor return air temperature senso

Coil inlet temperature sensor

yellow/green
white

EXV

Electronic white
~ ~
expansion valve
Fan motor2

(220V~/50Hz)
High High
Notes:
JP1
: 15Pa

: 50Pa

High High
5、 Field wiring.

SW1.2 SW1.3 SW1.6

OFF OFF OFF

Model: MCK010/015/018/020T

SW-PB J1 LINE
KEY1

J6 J5 J4 HF LF J3 J2
A
CON5
B

NEUTRAL
JP2
JP1 red
JP6 JP5 JP3

L
1

ON
2

SW1
3

Connecting indoor/outdoor ON DIP

SW2
4

units communication ON DIP

5
6

1 2 3 4 5 6
DIP

6
8

ROOM CON6
black

red

blue
blue
blue

TR1 TR2
LF MF HF
Indoor return air temperature senso

Coil inlet temperature sensor

yellow/green
yellow/green

EXV

Electronic M M M
expansion valve
~ ~ ~
Transformer

Swing motor Drainage Fan motor

receiving pump

(220V~/50Hz)
Remote controller
JP1
1、
Model SW3.2 SW3.3 SW3.5 SW3.6 HF MF
010 OFF OFF OFF OFF 010 yellow brown other JPs are set to OFF.
3、 SW2 sets this unit address.
4、 Field wiring.
SW1.3 SW1.4 SW1.6
OFF OFF OFF

page 16
Model: MCK025/030/040/050T

SW-PB J1 LINE
JP7 KEY1

J6 J5 J4 HF LF J2
A
B

NEUTRAL
JP2
JP1 red blue
JP6 JP3 JP4

L N N N
SW3

ON

SW1
Connecting indoor/outdoor ON DIP
SW2
units communication ON
DIP

1 2

CON6

black

red

blue

blue
white

red
blue
black
Water level switch SW-PUMP
Indoor return air temperature senso

Coil inlet temperature sensor

Coil middle temperature sensor

Coil outlet temperature sensor

yellow/green

yellow/green
EXV

Electronic
expansion valve M M M
Transformer ~ ~ ~
Swing motor
Remote
R Indicator pump
receiving

DIP switch SW3 settings:

(220V~/50Hz)

Remote controller Notes: JP1

1、

SW1.1 SW1.2 SW1.3 SW1.6

OFF OFF OFF OFF Field wiring.

Model: MCM020/030T

SW-PB J1 LINE
KEY1

J6 J5 J4 HF LF J2
CON5

red

white

NEUTRAL
JP1 JP2
JP6 JP3

L N
ON

SW1
Connecting indoor/outdoor ON DIP
SW2
units communication ON
DIP

ROOM CON6
black
yellow
blue
white

blue

red
Indoor return air temperature senso

Coil inlet temperature sensor

Coil middle temperature sensor

Coil outlet temperature sensor

yellow/green
yellow/green

Electronic red M M
expansion valve ~ ~
Transformer black

Remote Fan motor Swing motor

Indicator
receiving

(220V~/50Hz) Notes: JP1

Remote controller

SW1.1 SW1.3 SW1.6 Field wiring.

OFF OFF

page 17
Model: MCM050T

SW-PB J1 LINE
JP7 KEY1

J5 HF MF J3

A
B
NEUTRAL

red

orange
brown
yellow
JP2
JP6 JP5 JP4

CON3 L N N LF MF HF

ON
2
SW1

3
Connecting indoor/outdoor ON DIP
SW2

4
units communication ON DIP

5
6
6

DIP
5 6

8
CON6

blue

orange
brown
yellow
blue
orange
brown
yellow

blue
red
Indoor return air temperature senso

Coil inlet temperature sensor

Coil middle temperature sensor

Coil outlet temperature sensor

yellow/green

yellow/green
EXV

Electronic black M M
expansion valve ~ ~
Transformer black black

Remote Fan motor 1 Fan motor 2 Swing motor

receiving Indicator

(220V~/50Hz) Notes:
JP1

Remote controller

SW3.1 SW3.7 SW3.8 SW1.1 SW1.2 SW1.5 SW1.6 Field wiring.

ON 0N OFF OFF OFF OFF OFF

Model: MDB050/060T

k1

k2

k3
黄 棕 橙

SW-PB J1 LINE
JP7 KEY1

J5 HF MF J3 J2
A
CON5
CON3 MOTOR B

NEUTRAL
JP1 JP2
JP6 JP5 JP4 k3 k1
red

Transformer
1

ON

L N MF HF
2

SW1
3

Connecting indoor/outdoor ON DIP

SW2
4

units communication ON DIP

5

1 6
Middle
7

Low

High
DIP

LCD 1 2 3 5 6
8

TR1 TR2
WATER

Wire controller
Indoor return air temperature senso

Coil inlet temperature sensor

Coil middle temperature sensor

Coil outlet temperature sensor

M
yellow/green

yellow/green
white

white
~
Remote controller Fan motor

(220V~/50Hz)
Notes: JP1

DIP switch SW3 settings:

SW1.3 SW1.4
Field wiring.
OFF OFF

page 18
Model: MDS030A

220V~/50Hz

N N
L

FU 2

EXV PWMV KM

3 5 7 8 10

PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN
1L1 3L2

KM
LIVE
2T1 4T2 RY1 RY2 RY3 RY4 RY5 RY6 RY7

N NEUTRAL

J2
orange
brown

NEUTRAL
blue red
blue

red

OV-COMP3
C Shaft
white Transformer
CN1
McQuay OV-COMP2
heater
PTC C1
R
CM 13 C2 M
S ~ OV-COMP1
14 J1
white black LP
LP
Compressor Fan 1 11

JP1 JP2
HP 12 HP
A B GND

OD TEMP.

C-BTM

MidLet
InLet
DLT

RTN
AI-IN

Connecting indoor units communication

Coil middle temperature sensor (TH5)
Description of components and parts: Jumper settings: DIP switch J2 setting:
Symbol Description Symbol Description
JP1 JP2 J2.6 回气温度感温器(TH3)

PTC Compressor start-up unit FU Fuse Ambient temperature sensor (TH2)

OFF OFF ON
Notes: Air discharge temperature sensor of the digital compressor (TH1)
KM Contactor EXV Electric expansion valve
1: Field wiring
C1-2 Capacitor PWMV Solenoid valve 2: Factory wiring
J1.1 J1.7
3:
HP High pressure switch LP Low pressure switch OFF OFF ON 4: and JP2 are ON.

Model: MDS030AR

220V~/50Hz

N
L

FU 2

EXV KM

3 7 8 10
PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN

1L1 3L2

KM
LIVE
2T1 4T2 6T3 RY1 RY2 RY3 RY4 RY5 RY6 RY7

N NEUTRAL

J2
orange

NEUTRAL
brown

blue red
blue

red

OV-COMP3
C Shaft white Transformer
CN1
McQuay OV-COMP2
heater
R C2
PTC C1 13
M
S ~ OV-COMP1
J1
white black LP 11 LP
Compressor Fan 1
JP1 JP2
HP 12 HP
A B GND
OD TEMP.

C-BTM

MidLet

OutLet
InLet
DLT

RTN

AI-IN

Description of components and parts: Coil outlet temperature sensor (TH6)

Connecting indoor units communication
Coil middle temperature sensor (TH5)
Symbol Description Symbol Description Jumper settings: DIP switch J2 setting:
Coil inlet temperature sensor (TH4)
PTC Compressor start-up unit FU Fuse JP1 JP2 J2.6 Return air temperature sensor (TH3)
4WV Four-way valve EXV Electric expansion valve OFF OFF OFF Ambient temperature sensor (TH2)
Notes:
KM Contactor PWMV Solenoid valve Air discharge temperature sensor of the digital compressor (TH1)
1: Field wiring
C1-2 Capacitor LP 2: Factory wiring
J1.3 J1.4 J1.5 J1.6 J1.7
3:
HP High pressure switch RC Surge suppressor OFF OFF OFF OFF ON OFF ON 4: and JP2 are ON.

page 19
Model: MDS040A

220V~/50Hz
N N
L

FU 2

PWMV KM

3 5 7 8 10

PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN
1L1 3L2 5L3

KM
LIVE
2T1 4T2 6T3 RY1 RY2 RY3 RY4 RY5 RY6 RY7

N NEUTRAL

J2

NEUTRAL
orange

orange
yellow

yellow
brown

brown
red

blue

blue

blue

blue

McQuay
OV-COMP3

C C3
Transformer
OV-COMP2

CM R
C1 PTC
C2
M M
TRAN-L

S ~ ~ OV-COMP1
13 14 J1
white red red LP
Compressor Fan 1 Fan 2 11 LP
JP1 JP2
HP 12 HP
A B GND

OD TEMP.

C-BTM

MidLet
InLet
DLT

RTN
AI-IN

Connecting indoor units communication

Coil middle temperature sensor (TH5)
Description of components and parts: Jumper settings: DIP switch J2 setting:

Symbol Description Symbol Description JP1 JP2 J2.6 Return air temperature sensor (TH3)

PTC Compressor start-up unit FU Fuse OFF OFF ON Ambient temperature sensor (TH2)

Notes: Air discharge temperature sensor of the digital compressor (TH1)

KM Contactor PWMV Solenoid valve
1: Field wiring
C1-3 Capacitor LP Low pressure switch J1.1 J1.7 2: Factory wiring
3:
HP High pressure switch OFF OFF OFF
4: If the unit is connected at the end of the bus, JP1 and JP2 are ON.

Model: MDS040AR

220V~/50Hz

N N
L

FU 2

EXV KM

3 7 8 10
PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN

3L2 21

KM
LIVE
2T1 4T2 22
RY1 RY2 RY3 RY4 RY5 RY6 RY7

N NEUTRAL
J2

NEUTRAL
orange

orange
yellow

yellow
brown

brown

blue red
blue

blue

OV-COMP3
C Shaft Transformer
CN1
McQuay OV-COMP2
heater
PTC C1
R
CM C2
M M
S ~ ~ OV-COMP1
13 14 J1
white red red LP
LP
Compressor Fan 1 Fan 2 11

JP1 JP2
HP 12 HP
A B GND
OD TEMP.

C-BTM

MidLet

OutLet
InLet
DLT

RTN

AI-IN

Description of components and parts: Coil outlet temperature sensor (TH6)

Connecting indoor units communication
Symbol Description Symbol Description Coil middle temperature sensor (TH5)
Jumper settings: DIP switch J2 setting:
Coil inlet temperature sensor (TH4)
PTC Compressor start-up unit FU Fuse JP1 JP2 J2.6 Return air temperature sensor (TH3)
4WV Four-way valve EXV Electric expansion valve OFF OFF OFF Ambient temperature sensor (TH2)
Notes:
KM Contactor PWMV Solenoid valve Air discharge temperature sensor of the digital compressor (TH1)
1: Field wiring
C1-3 Capacitor LP Low pressure switch 2: Factory wiring
J1.7
3:
HP High pressure switch RC Surge suppressor OFF OFF OFF OFF 4: and JP2 are ON.

page 20
Model: MDS050A

220V~/50Hz
N
L

FU 2

PWMV KM

3 5 7 8 10

PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN
1L1 3L2 5L3

KM
LIVE
2T1 4T2 6T3 RY1 RY2 RY3 RY4 RY5 RY6 RY7

N NEUTRAL

J2

NEUTRAL
orange

orange
red

blue

blue

yellow

yellow
brown

brown
blue

blue

TRAN-H OV-COMP3

C Transformer
McQuay OV-COMP2
C3
CM R
C1 PTC
C2
M M
TRAN-L

S
~ ~
13 14 J1
white red red LP
Compressor Fa n 1 Fan 2 11 LP
JP1 JP2
HP 12 HP
A B GND

OD TEMP.

C-BTM

MidLet

OutLet
InLet
DLT

RTN
AI-IN

Connecting indoor units communication

Description of the components and parts: Coil middle temperature sensor (TH5)
Jumper settings: DIP switch J2 setting:
Symbol Description Symbol Description
J2.6 Return air temperature sensor (TH3)

PTC Compressor start-up unit FU Fuse OFF OFF Ambient temperature sensor (TH2)
ON
Notes: Air discharge temperature sensor of the digital compressor (TH1)
KM Contactor PWMV Solenoid valve
1: Field wiring
C1-3 Capacitor LP Low pressure switch Factory wiring
J1.7
3:
HP High pressure switch OFF ON
4: and JP2 are ON.

Model: MDS050AR

220V~/50Hz

N N
L

FU 2

PWMV 4WV

3 4 5 7 8 10
PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN

3L2 5L3 21

KM
LIVE
2T1 4T2 22
RY1 RY2 RY3 RY4 RY5 RY6 RY7

N NEUTRAL
J2
orange

orange
yellow

yellow
brown

brown
blue

blue

NEUTRAL
blue

red

TRAN-H

McQuay
OV-COMP3
C CN1
Shaft Transformer
OV-COMP2
R C2 C3 TRAN-L
PTC C1 M M
S ~ ~ OV-COMP1
14 J1
white red red LP 11 LP
Compressor Fa n 1 Fan 2
JP1 JP2
HP 12 HP
A B GND
OD TEMP.

C-BTM

OutLet
InLet
DLT

RTN

AI-IN

Description of the components and parts: Coil outlet temperature sensor (TH6)
Connecting indoor units communication
Coil middle temperature sensor (TH5)
Symbol Description Symbol Description Jumper settings: DIP switch J2 setting:
Coil inlet temperature sensor (TH4)
PTC Reverse phase-loss protector FU Fuse JP1 JP2 J2.6 Return air temperature sensor (TH3)
4WV Four-way valve EXV Electronic expansion valve OFF OFF OFF Ambient temperature sensor (TH2)
Notes:
KM Contactor PWMV PWM valve Air discharge temperature sensor of the digital compressor (TH1)
DIP switch J1 settings: 1: Field wiring
C1-3 Capacitor LP Low pressure switch 2: Factory wiring
J1.1 J1.2 J1.3 J1.4 J1.5 J1.6 J1.7
3:
HP High pressure switch RC Surge suppressor OFF OFF OFF OFF OFF ON 4: and JP2 are ON.

page 21
Model: MDS050AR

380V/3N~/50Hz

R S
N
T

DB3A
L
FU 81 71
yellow

green

red

RC
EXV 4WV

21 22 23
1

PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN
KM

L1 LIVE
RY1 RY2 RY3 RY4 RY5 RY6 RY7
OL
N NEUTRAL
J2

NEUTRAL
orange

orange
yellow

green

yellow

yellow
brown

brown
blue

blue
red

McQuay
OV-COMP3
CN1
T2 Transformer
OV-COMP2
T3
M M M
~ C1 ~ C2 ~ OV-COMP1 12
OL
Shaft heater
J1
18 red 20 red LP 15 LP
Digital compressor Fan 1 Fan 2 JP1 JP2
HP 16 HP
A B GND

OD TEMP.

C-BTM

OutLet
InLet
DLT

RTN
AI-IN
Description of the components and parts:

Symbol Description Symbol Description Coil outlet temperature sensor (TH6)

Connecting indoor units communication
Coil middle temperature sensor (TH5)
DB3A FU Fuse
DIP switch J2 setting: Coil inlet temperature sensor (TH4)
4WV Four-way valve EXV Electronic expansion valve OL JP1 JP2 J2.6 Return air temperature sensor (TH3)

KM Contactor PWMV PWM valve 12.9A OFF OFF Ambient temperature sensor (TH2)
OFF
Notes:
C1-2 Capacitor OL Overload protector Air discharge temperature sensor of the digital compressor (TH1)
1: Field wiring
HP High pressure switch LP J1.2 J1.3 J1.4 J1.5 J1.6 J1.7 2: Factory wiring
3: J2.1~2.5 sets the internetworking control address
RC Surge suppressor OFF OFF OFF OFF OFF OFF ON
4: If the unit is connected at the end of the bus, JP1 and JP2 are ON.

Model: MDS060A

380V/3N~/50Hz

R S
N

DB3A
L
FU 81 71

23 K3

22 K2

21 K1
yellow

green

red

PWMV KM K1 K2 K3

1 3 7 8
PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN

KM

L1 LIVE
RY1 RY2 RY3 RY4 RY5 RY6 RY7
OL
N NEUTRAL

J2

NEUTRAL
orange

orange
yellow

brown

brown
green

blue

blue
red

red

red

OV-COMP3

T2
white
17
white
19 Transformer
McQuay OV-COMP2
T1 T3
M M M
~ C1 ~ C2 ~ OV-COMP1 12
OL
J1
18 20 LP 15 LP
Digital compressor black Fan 1 black Fan 2 JP1 JP2
HP 16 HP
A B GND
OD TEMP.

C-BTM

MidLet

OutLet
InLet
DLT

RTN

AI-IN

Description of the components and parts:

Connecting indoor units communication
Coil middle temperature sensor (TH5)
Symbol Description Symbol Description
Overload settings and jumper settings: DIP switch J2 setting:
DB3A Reversion phase-loss protector FU Fuse
OL JP1 JP2 J2.6 Return air temperature sensor (TH3)

KM Contactor PWMV Solenoid valve 14.0A Ambient temperature sensor (TH2)

OFF OFF ON
Notes: Air discharge temperature sensor of the digital compressor (TH1)
C1-2 Capacitor OL Overload protector
1: Field wiring
K1-3 Relay LP Low pressure switch J1.7 2: Factory wiring
3:
HP High pressure switch OFF OFF 4: If the unit is connected at the end of the bus, JP1 and JP2 are ON.

page 22
Model: MDS060AR

220V~/50Hz

N N
L

FU 2

19 K3

18 K2

17 K1

RC
EXV KM K1 K2 K3

3 5 7 8 10

PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN
3L2 21

KM
LIVE
2T1 4T2 22
RY1 RY2 RY3 RY4 RY5 RY6 RY7

N NEUTRAL

J2

NEUTRAL

orange
orange

brown
brown
blue

red

blue
blue

red

red
OV-COMP3
C
Shaft Transformer
CN1
McQuay OV-COMP2
white white
CM
R heater
PTC C1 13
M 15
M
S C2
~ ~ OV-COMP1
14 J1
white black black LP 11 LP
Compressor Fa n 1 Fan 2
JP1 JP2
HP 12 HP
A B GND

OD TEMP.

C-BTM

MidLet

OutLet
InLet
DLT

RTN
AI-IN
Description of the components and parts:

Symbol Description Symbol Description Coil outlet temperature sensor (TH6)

Connecting indoor units communication
Coil middle temperature sensor (TH5)
PTC Reverse phase-loss protector FU Fuse DIP switch J2 setting:
Coil inlet temperature sensor (TH4)
4WV Four-way valve EXV Electronic expansion valve JP1 JP2 J2.6 Return air temperature sensor (TH3)

KM Contactor PWMV PWM valve OFF OFF OFF Ambient temperature sensor (TH2)
Notes:
C1-3 Capacitor LP Low pressure switch DIP switch J1 settings:
Air discharge temperature sensor of the digital compressor (TH1)
1: Field wiring
HP High pressure switch RC Surge suppressor J1.4 J1.5 J1.6 J1.7 2: Factory wiring
3: J2.1~2.5 sets the internetworking control address
K1-3 Relay OFF OFF OFF OFF ON OFF
4: and JP2 are ON.

Model: MDS060AR

380V/3N~/50Hz

R S
N

DB3A
L
FU 81 71

23 K3

22 K2

21 K1
yellow

green
red

EXV KM K1 K2 K3

1 5 7 8
PWMV

4WV

DIG COMP

HI-FAN
FIXED COMP

LOW-FAN
MID-FAN

KM

L1 LIVE
RY1 RY2 RY3 RY4 RY5 RY6 RY7
OL
N NEUTRAL

J2

NEUTRAL
orange

orange
yellow

brown

brown
green

blue

blue
red

red
red

OV-COMP3

T2
white
17
white
19 Transformer
CN1
McQuay OV-COMP2
T1 T3
M M M
Shaft ~ C1 ~ C2 ~ OV-COMP1 12
OL
J1
LP
18 20 15 LP
Digital compressor black Fan 1 black Fan 2 JP1 JP2
HP 16 HP
A B GND
OD TEMP.

C-BTM

MidLet

OutLet
InLet
DLT

RTN

Description of the components and parts: AI-IN

Symbol Description Symbol Description Coil outlet temperature sensor (TH6)

Connecting indoor units communication
Coil middle temperature sensor (TH5)
DB3A FU Fuse
DIP switch J2 setting:
Coil inlet temperature sensor (TH4)
4WV Four-way valve EXV Electronic expansion valve OL JP1 JP2 J2.6 Return air temperature sensor (TH3)

KM Contactor PWMV Solenoid valve 14.0A OFF OFF Ambient temperature sensor (TH2)
OFF
Notes:
C1-2 Capacitor Overload protector Air discharge temperature sensor of the digital compressor (TH1)
OL
1: Field wiring
K1-3 Relay LP J1.2 J1.3 J1.4 J1.5 J1.6 J1.7 2: Factory wiring
3: J2.1~2.5 sets the internetworking control address
HP High pressure switch RC Surge suppressor OFF OFF OFF OFF ON OFF 4: If the unit is connected at the end of the bus, JP1 and JP2 are ON.

page 23
Model: MDS080/100/120B

380V/3N~/50Hz

Overcooling circuit outlet temperature sensorTH11

N
R T

Air suction temperature sensor TH12

Coil middle temperature sensor TH3
FU L

T 71

LPT

1 2 3
yellow

white
black
bl k
blue

hit
red

red
TR LOW-I HI-1 TH7 TH5 TH3 TH12 TH11 LOW-U HI-U

KM1 KM2 KM3 KM4 MDS-M

V2-
30

Apc Bin Ain

31 Connecting the indoor unit
OL1 OL2 OL3 OL4
FIX2-OL 32
OL1 12
FIX1-OL 33 Connecting central control
n system
MDS-P
yellow

21 22 23 24 25 26
blue

blue

13
red

red

OL2
DIG-OL
red
blue
yellow

brown
white
black
L1 OL4 17
HP

FANH
T2 T2

FANL
PMW

4WV

FIX2

FIX1
SV2

SV1
T1 T3 T1 T3
M M M
~ ~ ~ L
EXV1 EXV4

J1 J18

1 2 4 10 11

KM3 KM4 EXV4

Constant-speed Digital compressor Fan motor 3 5

compressor PMW KM1 KM2

Description Symbol Description

Model OL4
Reversion MDS080B 0.67A
DB3A FU Fuse

KM Contactor Overcooling electronic MDS120B 1.8A Notes:

expansion
p valve
1: Field wiring
HP High pressure switch Solenoid valve 2: Factory wiring
3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.
LPT Low pressure sensor OL Overload protection MDS080B
MDS100B
TR Transformer MDS120B

Model: MDS080/100/120BR

380V/3N~/50Hz
Overcooling circuit outlet temperature sensorTH11

N
R T
FU L
Air suction temperature sensor TH12
Coil middle temperature sensor TH3

T 71

1 2 3
yellow

white
black
blue
red

red

TR LOW-I HI-1 TH7 TH5 TH3 TH12 TH11 LOW-U HI-U

KM1 KM2 KM3 KM4 MDS-M

V2-
Apc Bin Ain

Connecting the indoor unit

OL1 OL2 OL3 OL4
FIX2-OL
18 19
OL1 12
FIX1-OL
yellow

yellow

MDS-P
blue

blue

21 22 23 24 25 26
red

red

OL2 13
DIG-OL
red

yellow

brown
white
black

S1
L1 OL4 17
HP
FANH

T2 T2
FANL
PMW

4WV

FIX2

FIX1
SV2

SV1

T1 T1 T3
M M
~ ~ L
EXV1 EXV4

J1 J18
Shaft heater
1 2 4 7 10 11

KM3 KM4

3
Constant-speed Digital compressor Fan motor
compressor PMW 4WV KM1 KM2

Descriptions of the components and parts:

Symbol Description Description

DB3A Fuse
protector
4WV
Notes:
KM Contactor
1: Field wiring
HP Solenoid valve 2: Factory wiring
S3.4 3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.
LPT Low pressure sensor OL Overload protection
ON
TR Transformer

page 24
Model: MDS150B

Air discharge temperature sensor of the digital compressor TH1

380V/3N~/50Hz

N
R T
FU L

T 71

LPT

1 2 3
yellow
blue

white
black

white
black
red

red

red
TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH4 TH2 LOW-U HI-U

V1+
black
V1-
KM1 KM2 KM3 KM4 KM5 V2+
white V2-
MDS-M
30

Bpc Apc Bin Ain

OL1 OL2 OL4 OL5 Connecting the indoor unit
OL2 12
FIX2-OL

MDS-P
yellow

yellow

OL1 13
Connecting central control
n system
blue

blue

blue

21 23 24 26
red

red

red

OL3 14
DIG-OL
red

yellow

brown
white
black

L1 HP 15 OL4 16 OL5 17
HP

FANH
T2 T2 T2

FANL
PMW

FIX1
SV2

SV1

DIG
T1 T3 T1 T3 T1 T3
M M M M
~ ~ ~ ~ L
EXV1 EXV4

J1 J18

1 2 4 8 10 11

KM4 KM5 EXV4

Constant-speed Constant-speed Digital compressor Fan motor 3 5

compressor 1 compressor 2 PMW KM5 KM4 KM2 KM1 KM3

Description of the components and parts:

Reversion
DB3A FU Fuse

KM Contactor
Notes:
HP High pressure switch Solenoid valve
OL1 OL3 OL4 OL5 1: Field wiring
LPT OL Overload protection 14.0 14.0 3.3A 1.8A 2: Factory wiring
3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.
HPT High pressure sensor
S2.3 S3.4
TR Transformer ON ON

Model: MDS150BR

380V/3N~/50Hz
Overcooling circuit outlet temperature sensorTH11

N
R T
FU

T 71

LPT

1 2 3
yellow

white
black

white
black
blue
red

red

red

TR LOW-I HI-1 TH7 TH5 TH3 TH12 TH11 LOW-U HI-U

KM1 KM2 KM3 KM4 KM5 MDS-M

V2-
30
Bpc Apc Bin Ain

OL1 OL2 OL4 OL5 31 Connecting the indoorr unit

OL2 12 32
FIX2-OL
18 19
33 Connecting central control
o system
yellow

OL1 13
blue

blue

21 23 24 25 26
red

red

red

OL3 14
DIG-OL
red
blue
yellow

brown
white
black

S1 S2 S3
L1 HP 15 OL4 OL5 17
HP
FANH

T2 T2 T2
FANL
PMW

4WV

FIX2

FIX1
SV2

SV1

T1 T1
M M
~ ~ L
EXV1 EXV4

J1 J18
Shaft
heater heater heater 1 2 4 8 10 11

KM4 KM5

Constant-speed Constant-speed Digital compressor Fan motor 3 5

compressor 1 compressor 2 PMW KM5

Description of the components and parts:

Reversion
DB3A Fuse

4WV

KM Contactor Notes:
OL1 OL3 OL4
1: Field wiring
HP High pressure switch 14.0 14.0 3.3A 2: Factory wiring
3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.
LPT Low pressure sensor Overload protection
S2.3 S3.2 S3.3 S3.4
HPT High pressure sensor Transformer ON OFF ON ON

page 25
Model: MDS180B

380V/3N~/50Hz

Air discharge temperature sensor of the digital compressor TH1

Ambient temperature sensor TH8
R S
FU L

71
yellow
blue
red

TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH9 TH8 TH4 TH2 TH1
V1+
V1-
V2+
V2-
MDS-E
MDS-M

EXV2
KM2 KM3 KM4
FIX3-OL

EXV3
OL2 OL3 OL4 L 45

Apc Bin Ain

L

FANH1

FANH2

FANH3
FANL1

FANL3

SV2
L
L1 HP 15

S1 S2
yellow

yellow

yellow
blue

blue

blue

4WV2

4WV1
35 36 37 41 43

PMW
red

red

red

FIX3

FIX2

FIX1

DIG
EXV1 EXV4
brown
white
black

brown
white
black
20 22 23 1 2 5 7 10

T2 T2 T2
T1 T3 T1 T3 T1 T3
M M M M M
~ ~ ~ ~ ~
KM5 KM7

24

KM4 KM7 4WV2 KM2 KM1 KM3 EXV4

Constant-speed Constant-speed Digital compressor Fan motor 1 Fan motor 2

compressor 1 compressor 2

Descriptions of the components and parts:

Symbol Description

FU Fuse

Notes:
PMW Solenoid valve
1: Field wiring
OL OL1 OL2 OL3 OL4 OL5 OL6 OL7 2: Factory wiring
3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.

Model: MDS180BR

380V/3N~/50Hz
Overcooling circuit outlet temperature sensorTH11
Air suction temperature sensor TH12

R S
FU L

T 71 EXV2
yellow
blue
red

TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH12 TH11 LOW-U HI-U

MDS-E
MDS-M
EXV2

KM2
FIX3-OL 45
Bin Ain

OL2 12
EXV3

46 Connecting the indoor unit

OL2
Connecting central control system
28 29 30
FANH1

FANH2

FANH3
FANL1

FANL3

SV2
L

L1 HP 15 17

S1 S2 S3
yellow

yellow

yellow

4WV2

4WV1

35 36 37 41 43
PMW

FIX3

FIX2

FIX1

DIG
blue

blue

blue
red

red

red

EXV1 EXV4
brown
white
black

brown

black

20 22 23 1 2 3 5 10

T2 T2
T1 T3 T1 T3
M M M M
~ ~ ~ ~
KM5 KM7
Shaft heater
24

KM4 KM7 KM2 KM1 KM3

Constant-speed Constant-speed Digital compressor Fan motor 1 Fan motor 2

compressor 1 compressor 2

Description of the components and parts:

Symbol

DB3A

4WV

KM Notes:

1: Field wiring
HP
2: Factory wiring
S3.4
LPT Low pressure sensor Solenoid valve 3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.
OFF
HPT High pressure sensor Overload protection

TR Transformer

page 26
Model: MDS200/220/240B

380V/3N~/50Hz

Air discharge temperature sensor of the digital compressor TH1

Overcooling circuit outlet temperature sensorTH11

Before overcooling circuit temperature sensor TH9

After overcooling circuit temperature sensor TH10
Air suction temperature sensor TH12

Ambient temperature sensor TH8

R S

LPT HPT

red
yellow
blue
red

TR LOW-I HI-1 TH7 TH5 TH3 TH11 TH10 TH8 TH4 TH1 HI-U
V1+
V1-
V2+
V2-
MDS-E

EXV2
MDS-M

Bin Ain
L

EXV3
L

FANH1

FANH2

FANH3
FANL1

FANL2

FANL3

SV2
yellow

yellow

yellow

yellow

L
blue

blue

blue

blue

L1 HP 15
red

red

red

red

S1 S2 S3
MDS-P
brown
white
black

brown
white
black
19

4WV2

4WV1
PMW

FIX3

FIX2

FIX1

DIG
EXV1 EXV4

J1

T2 T2 T2 T2 1 2 4 5 7 10
T1 T3 T1 T3 T1 T3 T1 T3
M M M M M M
~ ~ ~ ~ ~ ~

4WV KM1 KM4 EXV4

Constant-speed Constant-speed Constant-speed Digital compressor Fan motor 1 Fan motor 2

compressor 1 compressor 2 compressor 3

Descriptions of the components and parts:

Symbol Description

FU Fuse
Model OL1 OL2 OL4 OL6 OL7 OL8

PMW Solenoid valve

OL Notes:

1: Field wiring
2: Factory wiring
3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.

Model: MDS200/220/240BR

380V/3N~/50Hz
Air discharge temperature sensor of the digital compressor TH1

R S
FU L

EXV2

3
yellow
blue
red

TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH2 TH1

V1+
V1-
V2+
V2-
MDS-E
EXV2

KM1 KM3 KM4 KM5 KM6 KM8

OL3 11
MDS-M
L
45
Bpc Apc Bin Ain
EXV3

OL1 OL5 L

28 29 30 31 L
FANH1

FANH2

FANH3
FANL1

FANL2

FANL3

SV2
yellow

yellow

yellow

yellow

L
blue

blue

blue

blue

32 L1 HP 15
red

red

red

red

S1
MDS-P
red
blue
yellow

brown
white
black

red
blue
yellow

brown
white
black

4WV2

4WV1
PMW

FIX3

FIX2

FIX1

DIG

EXV1 EXV4

J1

T2 T2 T2 T2 1 2
T1 T3 T1 T3 T1 T3 T1 T3
M M M M M M
~ ~ ~ ~ ~ ~
Shaft Shaft Shaft Shaft
heater heater heater heater

Constant-speed Constant-speed Constant-speed Digital compressor Fan motor 1 Fan motor 2

compressor 1 compressor 2 compressor 3

Descriptions of the components and parts:

Symbol Description

FU Fuse
Model OL1 OL2 OL3 OL4 OL5 OL6 OL7 OL8
MDS200BR 14.0A 14.0A 14.0A 14.0A 1.9A 0.67A 1.9A 0.67A
MDS220BR 14.0A 14.0A 14.0A 14.0A 1.9A 0.67A 1.9A 0.67A
EXV2
expansion valve 2 MDS240BR 14.0A 14.0A 14.0A 14.0A 3.3A 1.8A 3.3A 1.8A Notes:
EXV4 expansion valve 4 1: Field wiring

PMW Solenoid valve 2: Factory wiring

3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.
OL Overload protection

page 27
Model: MDS260BR (Master Unit)

380V/3N~/50Hz

Air discharge temperature sensor of the digital compressor TH1

Overcooling circuit outlet temperature sensorTH11

After overcooling circuit temperature sensor TH10

N
R S T
FU L

Air suction temperature sensor TH12

Coil inlet temperature sensor TH2

T 71

LPT

1 2 3
yellow

white
black

white
black
blue
red

red

red
TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH11 TH4 TH2 LOW-U HI-U
V1+
black
V1-
KM1 KM2 KM3 KM4 white
V2+ MDS-M
V2-
30

Ain
31 Connecting the slave unit
OL1 OL2 OL3
FIX2-OL 32

Apc
18 19
OL1 12 33 Connecting central
n control system
FIX1-OL
yellow

MDS-P
blue

blue

24 25 26
red

red

OL2 13
DIG-OL
brown
white
black

LP
S1 S2 S3
L1 HP 17
HP

FANH
T2 T2

FANL
PMW

4WV

FIX2

FIX1
SV2

SV1

DIG
T1 T3
M N
M
~ ~ L
EXV1 EXV4

Shaft J1

heater heater 1 2 4 7 10 11

KM3 EXV1

Constant-speed Digital compressor Fan motor 3

compressor PMW KM4 KM1 KM2

Description of the components and parts:

Description

Fuse

4WV
Notes:
KM Contactor
OL1 OL4 1: Field wiring
HP 1.8A 2: Factory wiring
3: S1.3~S1.8 set the number of indoor units. For details of S2.4~S2.8, see the instructions.
LPT Low pressure sensor Overload protection
S1.1 S2.2 S2.3 S3.2 S3.3 S3.4
HPT High pressure sensor Transformer OFF ON OFF OFF OFF

Model: MDS260/280/300BR (Slave Unit)

380V/3N~/50Hz
Overcooling circuit outlet temperature sensorTH11
Air suction temperature sensor TH12

N
R T
Coil inlet temperature sensor TH2

FU L

T 71

LPT

1 2 3
yellow

white
black

white
black
blue
red

red

red

TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH12 TH11 TH4 TH2 LOW-U HI-U

V1+
black
V1-
KM1 KM2 KM3 KM4 KM5 V2+ MDS-M
V2-
Bpc Apc Bin Ain

Connecting the
h indoor unit
OL1 OL2 OL4 OL5
OL2 12 32
FIX2-OL
18 19
33 Connecting m
master unit
OL1 13
MDS-P
yellow

21 23 24 25 26
blue

blue

blue
red

red

red

OL3 14
DIG-OL
red
blue
yellow

brown
white
black

L1 HP 15 OL4 OL5 17
HP
FANH

T2 T2 T2
FANL
PMW

FIX1
SV2

SV1

T1 T1 T1
M N
M
~ ~ L
EXV1 EXV4

J1 J18
Shaft
heater heater heater 2 4 7 8 10 11

KM4 KM5

3 5
Compressor 1 Compressor 2 Compressor 3 Fan motor
KM5

Description of the components and parts:

Description
Reversion
DB3A FU Fuse OL1 OL3 OL4 OL5
System electronic 14.0 14.0 3.3A 1.8A
4WV

KM Notes:
Contactor
S2.1 S2.2 S2.3 S3.2 S3.3 S3.4 1: Field wiring
HP 2: Factory wiring
3: S1.3~S1.8 set the number of indoor units. For details of S2.4~S2.8, see the instructions.
LPT Low pressure sensor TR Transformer
HPT High pressure sensor

page 28
Model: MDS280/300BR (Master Unit)

380V/3N~/50Hz

N
R T
FU

T 71

LPT

1 2 3
yellow
blue

white
black

white
black
red

red

red
TR LOW-I HI-1 TH7 TH5 TH3 LOW-U HI-U

V1+
black
V1-
KM1 KM2 KM3 KM4 KM5 white
V2+ MDS-M
V2-
30

Ain
31 Connecting the slave
a unit
OL1 OL2 OL4 OL5
OL2 12
FIX2-OL

Apc
18 19
OL1 13
MDS-P
yellow

yellow
blue

blue

blue

21 23 24 26
red

red

red

OL3 14
red

yellow

brown
white
black
DIG-OL

S1 S2 S3
L1 HP 15 OL4 OL5 17
HP

FANH
T2 T2 T2

FANL
PMW

4WV

FIX2

FIX1
SV2

SV1

DIG
T1 T1
M M
~ ~ L
EXV1 EXV4

J1 J18
Shaft
heater heater heater 1 2 4 8 10 11

KM4 KM5 EXV1

Constant-speed Constant-speed Digital compressor Fan motor 3 5

compressor 1 compressor 2 PMW KM5

Description of the components and parts:

Reversion
DB3A FU Fuse

4WV

KM Contactor Notes:
1: Field wiring
HP 2: Factory wiring
3: S1.3~S1.8 set the number of indoor units. S2.1 sets the unit as a master/slave. For details of S2.4~S2.8, see the instructions.
LPT Overload protection
HPT Transformer

page 29
6 Installation
6.1 Outdoor Unit Installation

To Choose Location of Installation

To ensure the units cooling and heating performance, follow up the below to pick up right place to install
units:
• To avoid the discharge air return to air inlet, to avoid heated air discharged by other outdoor units; ensure
enough space for maintenance.
• To remove any barrier of air ventilation both air supply and air discharge.
• Maintain good ventilation for better heat exchange efficiency. If not, it will cause difficulties to maintain the
unit in future.
• Installation base shall be strong enough to support the units and prevent vibration. If not, it may cause the
unit falling off.
• Do not expose to sunshine place.
• To avoid to install units at dirty and salty place.
• To avoid to install units at easy burning gas leakage place.
• Do not install units which is subject to impact by typhoon and strong wind, also to avoid the place of
sunshine and snow & rain.
• Do not install the unit around the Hi-frequency equipment place (such as hi-frequency electric wielding
machine).
• Do not install units to the place where often contacts acid liquid.
• Do not install in the place usually using sulfide or other sprayer.

Space for Installation of Outdoor Units

One single outdoor units can be installed in one place, many outdoors can be installed one big place, refer
to the followings:
• Space for Single Unit ≥450mm+h2
≥450mm+h1
BACK
≥450mm

h2
h1

≥450mm
48 78 0 4
,3.
1

≥450mm
53 75 3 2
,9.
1

FRONT
≥450mm
≥450mm

AIR OUTLET GUIDE

≥450mm+h3
≥45°

≥100mm+h4
≥ 1000mm

FRONT
h3
≥300mm

FRONT
h4
≥450mm

≥450mm ≥900mm ≥900mm ≥450mm

• Space for More Than One Units
≥450mm

BACK BACK
FRONT FRONT FRONT
≥450mm

≥1000mm
FRONT FRONT

page 30
 ≥450mm ≥450mm

≥450mm
BACK BACK
BACK BACK

≥450mm
FRONT
BACK FRONT
BACK
BACK
FRONT FBRONT
ACK
FRONT FRONT
FRONT FRONT
FRONT FRONT

≥900mm ≥900mm
FRONT FRONT BACK
FRONT BACK
FRONT

≥900mm ≥900mm
BACK
FRONT BACK
FRONT
≥1000mm

≥450mm
≥1000mm ≥1000mm
BACK BACK
BACK BACK
≥1000mm

≥450mm
≥1000mm ≥1000mm

Handling Outdoor Units

Please refer to the followings to conduct moving of units; To use 4 supporting point to move units instead of
Suspension ropes
3Prote
points, to avoid
ctive pads
unstable move and
(8m orunits
longerdrop
× 2 roff.
opes)
<40°
<4 0 °
Suspension ropes
(8m or longer × 2 ropes)
Protective pads
<40°
<4 0 °

>8m

>8m

>8m

>8m

Notes:
• Do not tie or move the unit with the package rope, as it is easy to break
and bring danger.
• Do use special rope to tie the units for transportation.
• Do not touch the fins of units to avoid hurt of hand.
• Do keep the plastic bag from the child.

Outdoor Unit Installation

• To use the solid base or supporter to build the basement. Consider the strength of the floor, drainage (the
drainage flows from the unit in operation), and piping layout. If the strength is beyond requirement, the unit
may fall off to damage the unit and injure people.
• To fix the outdoor unit with screw bolt to avoid falling off by earthquake or strong wind.
• To stop vibration transferring to the installation part, the bottom panel and wall, this depends on the
installation condition. Take measures to stop the vibration (such as using cushion blocking or support).
• To place the edge unit correctly. If not, the unstable unit may cause the installation foots bent. Any incorrect
installation may cause the unit falling off and injuring people.
Warning:
• The installation ground and base must be strong enough to bear the unit weight and vibration.
• Notes for locating lower piping and layout: When locating lower piping and layout, make sure the basement
not block the hole at the bottom. When locating the lower piping, the basic height shall not be less than
100mm, which can ensure the pipe to get through the unit bottom.

page 31
6.2 Installation of the Combined Outdoor Units (Suitable for Model of MDS260/280/300)
Two outdoor units can be grouped as one outdoor unit, to couple with multi-indoor units. Grouped outdoor
units installation is more complicated than that of the single outdoor unit; please read the below notes
carefully before installation.

Select the Position of the Installation for Outdoor Unit

Select one unit as the main unit, the other one as the slave unit; and two units shall be positioned in the same
level side by side.
• Main unit and slave unit shall be installed in the same level.
• The distance between main and slave unit shall be more than 10mm.

Piping Connection of the Outdoor Units

• Accessory copper parts are packed with the outdoor units; piping connection includes gas, liquid and
balance piping connection between the main and slave units. All piping shall be with insulation material
and avoid any damage of this insulation material.

Gas and Liquid Piping Connection

• Gas and liquid piping connection with the units, please refer to the concerned chapter of “installation of
refrigeration piping”.
• Gas and liquid piping shall be connected paralleled, shown as below. The dimensions of the straight pipe
connected to the Tri-joint must meet the requirements below.

(Remove the panel before

piping connection)

Piping connection position

Main and slave units must be

installed in the same level
A
To units
A >10mm
To units
B >200mm
Bala C >500mm
nce B D>100mm
pipe
Liqu
id p
ipe
Gas
pipe

Tri-jiont
Elbow
Conn
e
indo ct pipe
or u
nits to
For φ28.6mm gas pipe, C D
directly connect to Tri-joint;
For φ34.9mm gas pipe, add a
reducer and a transition pipe φ28.6mm a transiton pipe
(only for φ34.9mm gas pipe)

page 32
Balance Piping Connection
• Balance piping must be installed. Balance piping shall be connected through the hole of side panel or
base panel or the piping connection position with the other outdoor unit.
• Balance piping shall be installed horizontally and orderly, and shall be lower than the access valve for
balance piping.
• Protect the balance piping carefully and avoid touching any other parts, especially need to keep the piping
from touching the wall of hole.
• Balance piping connection with the unit is shown in below drawing.

Side panel hole

Access valve for Base panel hole

balance piping (φ9.52)

Screw joi
nt

Balance p
ipe

Insulation and Protection for Connection Piping

• All connection piping shall be well insulated.
• All piping shall be well protected to avoid any bumping, trampling and rubbing with the surround when
vibrating. Otherwise the piping may be damaged, and affect the unit performance and safety, further more
other safety problems may occur.

page 33
 6.3 Indoor Unit Installation

To Choose the Position of Installation

Improper installation position will influence the cooling and heating performance, or even cause malfunction
or accident. To follow up the below instructions:
• Ensure air flow everywhere of room.
• No barrier for air flow.
• Enough maintaining space for installation. If not, it will cause difficulties to maintain the unit in future. If
not, it may cause the unit falling off.
• Wall or ceiling shall be strong enough to support indoor units.
• Do not expose to sunshine place.
• Do not install units at oil and steam gas place.
• Do not install leakage and easy burning gas place.
• Do not install around the Hi frequency equipment place.
• Do not install in the place usually using sulfide or other sprayer.

Installation of Indoor Unit

Installation of MCC-T Series Indoor Units
This type indoor units shall couple with duct working of air supply and air return; also can add the heating
coil and heater.

Indoor Unit
• To check the accessories are ready.
• To install the hooker and ensure it strong enough to support unit.
• Install the unit and check it installed horizontally; ensure the slope of the drainage piping , as shown in
below figure.

Notes:
10mm

drain direction

a. Ensure piping and air duct working are most efficient length and units shall be installed in the middle
position of the room.
b. When installation of the indoor units, to ensure the distance shall be larger than 3m between return air
inlet and heat exchanger.
• To install the refrigerant pipe drainage pipe. Specification for the refrigerant pipe and drainage pipe, see
screw joint
indoor
the sectionunit
“technical parameters”
E-EXV boxof Usage Instruction. Use the torque spanner to install the pipe to avoid
damaging the copper tube and its joint.
liquid pipe
• Do not use the damaged copper tube or dirty copper tube. To avoid long time expose to the air. Only get
the concerned preparation ready, to start the open valves, connector, copper cup and cover etc..
gas pipe
• Some model of this series product need connect a E-EXV box out of the machine, as shown in below
figure.
Note: The E-EXV box contain a electric-expanding valve in it. If the indoor unit is installed in the bedroom,
setting the E-EXV box out of the bedroom can efficient lower the noise of refrigerant flowing and
expanding.

When install the E-EXV box, make sure the box vertical and set it fast. The distance between the E-EXV
10mm

drain direction

box and indoor unit could not exceed the length-limit of the expanding valve cable. The cable has a plug to
connect the control boxdrain
of the indoor
ion unit.
10mm

direct

There are some manners to install the E-EXV (The installation must be safe and solid, and the installation
indoor
screw joint

direction must be vertical):

unit E-EXV box

liquid pipe

gas pipe

screw joint
indoor
unit E-EXV box
©2005 McQuay International
liquid pipe

gas pipe
©2005 McQuay International
page 34
 Duct Working Installation
Air Supply Duct Working Installation
Two types of air supply duct working are for option: round and rectangle. Round air duct working can be
connected up to the air supply inlet directly; while the rectangle one needs to be connected with a transition
air duct to air supply inlet, and separate to the air diffuser. Pick up the selected air distributor or diffuser to
meet the application requirements.
Air Return Duct Working Installation
To connect with return air inlet of indoor units, the other end connecting with return air inlet of ceiling. Make
a sailcloth foldaway air duct, and strengthen it with 8# iron rope, in this way, the unit can be adjusted freely
depends on ceiling height.
Insulation of Duct Working
Both air supply and return duct working shall be equipped insulation material with aluminum foil.
electrical heater jiont indoor unit return air heating coil jiont indoor unit return air

electrical heater jiont indoor unit return air heating coil 出 jiont
水 indoor unit return air

进 水

出 水

进 水

Electrical Heater and Heating Coil Installation

The way to install electrical heater and heating coil is almost the same, both need to connect to air outlet of
indoor units as shown as followings:

Install MCK-T Series Indoor Unit

Notes:
a. Ensure the space for installation.
b. Ensure no barrier, and good ventilation is a must.

≤0.3m
Please refer to the below figure: ≥0.5m ≥0.5m
≥0.5m
≥1.0m

girder
≤3.0m

≤0.3m

≥0.5m ≥0.5m
≥0.5m
obstacle
≥1.0m

girder
≤3.0m

indoor unit
floor
obstacle

indoor unit
floor

To refer to the above installation dimension to ensure the performance of units as much as possible.
The supports shall carry weight 4 times larger than the indoor units to avoid unnecessary vibration and
reduce the noise.

Installation Instruction
a. To keep indoor units from the source of heat and vapor.
b. To measure the position of fixing and drill hole in the ceiling and fix the units tightly.
c. The paper temperate shall be measure dimension before usage.
d. Ensure the paper temperate is the same dimension as hole dimension in the ceiling.
e. Before the completion of ceiling decoration, leave the paper temperate with the indoor unit.
f. Ensure the distance between the hang pole is 620.4mm×790.0mm.
g. To ensure use screw to fix the indoor units tightly.
h. To adjust distance between the bottom panel and ceiling is less than 35.0mm.
i. To check installation horizontally, and indoor units are fixed tightly without dropping off and vibration.

page 35
 (drill hole in ceiling) 890.0mm
790.0
(drill hole in ceiling) 890 .0mm
790.0

(drill hole in ceiling)890.0mm

(drill hole in ceiling)890.0mm
(machine dimension)820mm

35mm
(machine dimension)8 20mm

(machine dimension)

35mm
620.4
(machine dimension)

620.4
820mm
820mm

j. To cut the same shape of paper temperate in ceiling.

k. Drainage shall be smooth piping and slope installed.
l. To avoid drainage piping bent, shall be straight.
m. To install the drainage piping, do not exert too strong force.
n. It shall be installed diameter 20 flexible host to connect outside
part of drainage piping, as shown as figure.
o. Drainage piping shall be covered with insulation material
(thickness: 8.0mm polyphone plastic material), to avoid the dropping off of the condensing water.
p. To connect the drainage host and flexible host.
q. To fill in some water to piping to test the leakage.
r. After testing, to connect the other end of flexible host to indoor units.
Note:
In this type of indoor units, a water pump is used to help to drain the condensing water, to install unit
horizontally to avoid leakage of water and condensing water dropping off.

Installation of Front Panel

• To install the front panel, please check the piping connecting direction first.
(Follow the direction of the piping connection direction.)
• To remove the paper temperate.
• To remove the air filter and grill of front panel.
• To use 4 screw bolt to fix the frame of front panel tightly.
• To connect the indicator light with indoor unit and fan swing motor with indoor units respectively.
Note:
Ensure the frame of the front panel is fixed tightly to avoid the leakage of cool and dropping of condensing
water.

There are also the hole for fresh air and exhaust air for connection with outside in indoor unit, but as for air
piping, and only be the other side of refrigerant piping connector.
page 36
Return Air and Supply Air Direction
supply air supply air

return air
supply air supply air
Drawings for piping connector and its dimension (unit: mm):

air outlet fresh air inlet

Notes:
• Do not close all air outlet of indoor unit when start to run the unit to avoid the frost of evaporator.
• To ensure the thickness of insulation material and no leakage allowed.
• Fresh air shall be less than 20%.

Air Tightness of Outlet of Supply Air

• Total 4 air outlet can be sealed by insulation material but more than 2 air outlet closed will cause abnormal
operation of units.
• Open the front panel, to seal the air outlet in front panel.
• To ensure the length of insulation material is the same length of the air outlet.
• To extend the insulation material to cover the gas more than 10mm but not touch the air grill; there is no
need to extend insulation material more than 10 mm.

Installation of Air Inlet Grill

• Before installation of air inlet grill, to install the air filter.
• To ensure the right side to face the grill.
• Be careful to install the air filter in the frame of air filter supporter.
• To fix the filer with the front panel.
• To fix the grill and consider the service friendly to open the grill.

Installation of Drainage
a. Drainage piping shall be with slope 1/100.
b. To fix the drainage piping with long screw bolt.
c. After installation, to test the leakage drain to make sure it work.
d. Only in cooling mode, there will be detect of drainage status.
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page 37
Installation of MDB-T Series Indoor Unit
To mount the MDS050~060T in ceiling. With the air outlet flange close to the unit bottom, when the unit is
mounted in ceiling, the piping is simple and decreases the requirement for room height. After the installation,
only the air inlet/outlet is exposed, as shown below.
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• To check the accessories are ready

• To choose the location for installation
Make sure it is easy to connect cables and pipes. Select a place where needs shorter air pipe and fewer
connecting pipe work and ensure the building is with enough strength, ascertain the pole location and
adjust it to keep the unit horizontally, and examine safety of the suspending.
• To install the hook
Make sure to fix the hook, and the top suspending part is strong enough to bear the unit weight.
• To install the indoor unit
To fix the pole location, examine if it is in the same level with the unit, and check if the suspending panel
is stable; make sure there is a slope oriented to the drainage direction. Pay attention that the distance
between the return air outlet and the heat exchanger inlet shall not be less than 3m.
• To install the refrigerant piping
- If units expose to air more than 15s, units shall be vacuumed firstly. If the connecting piping is not
prepared for indoor unit, do not open sealed parts (valves, joints, rubber, plastic gasket and copper
cap).
• Duct working design
Well designed duct working can reduce noise level effectively. When doing this, please consider the
internal air pressure drop shall be equal to ESP, otherwise, air flow may be too big or too small, and cause
the unit failure. It can be solved by adjusting the fan speed to make them in balance (such as adjusting
the air speed of the diffuser).
• Installation of drainage piping
a. Slope is required as 1/100.
b. To use suspending bolt to fix the long drainage piping.
c. After installation, to run the leakage test is necessary.
d. Only in cooling mode, there is a need to detect the status of drainage.

page 38
Installation of MCM-T Series Indoor Unit

To Check the Accessories are Ready

To Install the Indoor Unit

There are two types of installation. Make sure the hook can bear the unit weight in ceiling mounting; a slope
for the drainage direction is a must both for ceiling/floor standing mounting; ensure there is enough space for
maintenance around the unit.
There are two type of installation: vertical floor standing or horizontal ceiling mounting:

ceiling mounting

ceiling mounting
floor standing mounting

floor standing mounting

≥500mm

≥300mm ≤250mm
≥500mm

ceiling mounting
≥300mm ≤250mm
≥400mm

ceiling mounting
≥400mm ≥1000mm

PULL PULL PULL PULL

≥1000mm

PULL PULL PULL PULL

floor standing mounting

floor standing mounting

If the indoor unit is semi-concealed mounted in ceiling, reserve holes in ceiling to ensure enough space for
300

mounting and maintenance, as shown below: 62

1

10
.0

3 00 300
62
1

10
.0

3 00 10mm machine top panel

10mm

ceiling

10mm machine top panel

10mm
166mm

10mm

ceiling

10mm
166mm

Horizontal Ceiling Mounted

1. To remove the air return grill, frame, side panel and suspending panel as shown as below:

panle side

suspending panel

frame

air return grill

page 39
 air return grill
2. To fix the suspending panel with screw bolt as shown as above right figure.
3. To hang the unit to the suspending panel and fix screw bolts, after installation of refrigerant pipe and
drainage pipe, install the return air grill and frame, as shown below left figure:

screw joint
indoor
unit E-EXV box

liquid pipe

gas pipe

• Install the E-EXV box: All models of this series product need connect a E-EXV box to finish the piping
installation, as shown on right figure:

Notes:
• The E-EXV box contains electric expansion valves, which needs to be mounted in proper place on the
liquid piping. When installing the E-EXV box, make sure the box vertical. The E-EXV
wall box and the wallindoor
unit could not exceed the length-limit of the electric expansion valve cable, as shown above right figure.
• There are some manners to install the E-EXV box (the mounting must be fixed and safe, and the direction
refrigerant pipe & drain pipe
must be vertical). (come out from top panel)
Pole
Installation mode 1: Rod mounting
Fix with screw
Installation mode 2: Mounting on the wall

Nut

Spring pad
Washer
Hook screw hole
Hook
Washer

Nut

Vertical Floor Standing

1. To remove the air return grill, frame, side panel and suspending panel as shown below:
2. To install the unit supporter and wall suspending panel, as shown below left figure:
Wall
Wall Wall

Refrigerant pipe & drainage

(come from the top panel) Refrigerant pipe & drainage
(come from the rear panel)

3. To install the refrigerant and drainage piping as shown above right figure;
4. To install the electrical expansion valve as same as the horizontal installation;
Installation of Drain Piping
a. Slope is a must and shall be 1/100, try to drain in a positive slope.
b. To fix the drain piping to use screw bolt.
c. After installation, to run the water leakage test is a must.
d. Only in cooling mode, there is a need to detect the status of drainage.

page 40
7 Troubleshooting
If the Followings Unit Malfunction Occurred, Please Follow the Below Simple Checking Step to Fix :
Symptom Analyses Solution
Indoor temperature is higher (heating) or lower (cooling) than
Compressor stop and fan Re – set up the temperature
setting temperature
work normally
When heating and defrost mode, indoor unit is just running Waiting for 10minutes
Power is not on Check and connect the power
Units do not work Set up the re-start function Wait or cancel timer on
Fuse broken in main power supply Replace the fuse
Cooling or heating not Air filter too dirty Clean or replace the filter
enough or too much Return air barrier Remove the barrier
Low battery Replace the battery
Remote controller unreadable
Wrong installation of battery Install properly
Condensing water in front Humidity too high Dehumidify
panel Setting temperature too low Set up the higher indoor temperature

• If user can not fix the problem, please contact the local service agent for assistance, meanwhile record
the malfunction code by remote controller and indication light of units self-checking function;

Fault Codes for MDSA/B Series

Item Code Description Item Code Description Item Code Description
1 E0 System malfunction 23 F8 4wv malfunction 45 16 Sensor broken(slave TH6 inlet coil 3#)
Sensor broken(slave
2 E1 Sensor broken(TH1 discharge temp) 24 F9 Refrigerant leakage 46 17
TH7 mid coil 3#)
Sensor broken(slave
3 E2 Sensor broken(TH2 inlet coil 1#) 25 FA Controller storage malfunction 47 18
TH8 ambient temp.)
Water pump(indoor drain Sensor broken(slave
4 E3 Sensor broken(TH3 mid coil 1#) 26 FB 48 19
pump) TH9 outlet coil)
Indoor and outdoor Sensor broken(slave
5 E4 Sensor broken(TH4 inlet coil 2#) 27 FC 49 1A
communication malfunction TH10 subcool outlet)
Master and slave Sensor broken(slave TH11 subcool
6 E5 Sensor broken(TH5 mid coil 2#) 28 FE 50 1B
communication malfunction suction)
Sensor broken(slave
7 E6 Sensor broken(TH6 inlet coil 3#) 29 H0 Digital comp overload 51 1C
TH12 suction)
8 E7 Sensor broken(TH7 mid coil 3#) 30 H1 Fixed comp1 overload 52 1F Emergency run
9 E8 Sensor broken(TH8 ambient temp..) 31 H2 Fixed comp2 overload 53 20 Outdoor storage malfunction
10 E9 Sensor broken(TH9 outlet coil) 32 H3 Fixed comp3 overload 54 27 Ambient temp.. exceed the limit
11 EA Sensor broken(TH10 subcool outlet) 33 H4 High pressure too high 55 28 4wv malfunction
Sensor broken(TH11
12 EB 34 H5 Sensor broken, high pressure 56 29 Refrigerant leakage
subcool suction)
13 EC Sensor broken(suction) 35 H6 Discharge temp. too high 57 30 Digital comp overload
14 EF Emergency run 36 L0 Super heat too low 58 31 Fixed comp1 overload
15 F0 Outdoor storage malfunction 37 L1 Low pressure too low 59 32 Fixed comp2 overload
16 F1 Sensor broken(indoor inlet coil) 38 L2 Sensor broken, low pressure 60 33 Fixed comp3 overload
17 F2 Sensor broken(indoor mid coil) 39 10 System malfunction 61 34 High pressure too high
Sensor broken(slave
18 F3 Sensor broken(indoor outlet coil) 40 11 62 35 Sensor broken, high pressure
TH1 discharge temp.)
Sensor broken(slave
19 F4 Sensor broken(indoor return air ) 41 12 63 36 Discharge temp. too high
TH2 inlet coil 1#)
Sensor broken(slave Super heat too low
20 F5 Sensor broken(indoor supply air) 42 13 64 40
TH3 mid coil 1#)
Indoor and controller Sensor broken(slave
21 F6 43 14 65 41 Low pressure too low
communication malfunction TH4 inlet coil 2#)
Sensor broken(slave
22 F7 Ambient temp. exceed the limit 44 15 66 42 Sensor broken, low pressure
TH5 mid coil 2#)

Indication Light Twinkle Related to Malfunction Code:

Type Heat Fan Dry Cool Type Heat Fan Dry Cool Type Heat Fan Dry Cool
Sensor, outdoor F F F F Pump, indoor F F On F Pressure high/low F F Off Off
Over load,
Sensor, indoor F F F On F F On On Communication F off F F
compressor
System failure F F F Off Pressure sensor, outdoor F F On Off Others F off F On

page 41
8 Servicing and Maintenance

Warning
Before maintenance service, please shut off the power supply and stop indoor andd outdoor units

Indoor Unit Maintenance

Part Maintenance checking step Times/month

1. Open the grill

Air filter 2. Take out the air filter 1
3. Use brush to clean the air filter with below 40ºC water

Front panel 1. Get rid of the dust and dirt by using cloth and detergent, clean the panel 1
1. To check the drain pan and host are clean or not, if it is dirty, clean it
Drain pan and host 3
2. To check there is no barrier for the condensing water flow out

1. To clean the dirt of fins

Evaporator 1
2. To clean any barrier for indoor air flow

1. To check the running ampere and voltage is normal or not

Electrical part 12
2. To check the electrical connection is fixed or loose

Outdoor Unit Maintenance

Part Maintenance checking step Times/month
Outdoor fan To check the noise level 1
1. To clean the dirt of fins
Outdoor condenser 1
2. To remove any barrier which prevent the air flow
Compressor Compressor running noise and vibrations 1

1. To check the running ampere and voltage is normal or not

Electrical part 2. To check the electrical connection is fixed or loose 1
3. To check the controller in normal working conditions

page 42
 REGISTERED
S&E

ISO 9002

©2003 McQuay International +1 (800) 432-1342 www.mcquay.com

While utmost care is taken in ensuring that all details in the publication are correct at the time of going to
press, we are constantly striving for improvement and therefore reserve the right to alter model specifications
and equipment without notice.
Details of specifications and equipment are also subject to change to suit local conditions and requirements
and not all models are available in every market.

page 43