TM - MDS - 2006
Engineered for flexibility and performance.
TM
Application Manual
Multi-Digital Scroll Units
Models: MDS030A(R) - MDS060A(R)
MDS080B(R) - MDS300B(R)
c 2004 McQuay International. All Rights Reserved.
is a registered trademark of McQuay in the United States and other countries, licensed and
recognized all over the world. Without prior written consent of McQuay, use of the above-named
trademark for business purposes may constitute a violation of the federal and state laws in the Unites
states and laws of related countries, and remain subject to a charge of trademark infringement and unfair
competition.
This manual is prepared by the Market Department of McQuay
s Shenzhen-based factory. Pursuant to
the copyright law, this manual may not be reproduced or otherwise distributed in whole or in part without
prior written permission of McQuay.
We have used our best endeavor to make sure the information contained in this manual is accurate. As
we are always committed to technological improvement, the units and specifications are subject to
change without further notice. In addition, to meet local criteria and customer requirements, we may
modify the units and specifications. Please also take notice that not all the models suit every market.
Discussed in this manual is a product made in China in compliance with the national standard GB/T18837-2002.
CONTENTS
1. Overview
1.1 General Information .........................................................................................................4
1.2 Working Principle & System Principle .............................................................................. 4
1.3 Main Features ................................................................................................................ 10
1.4 Nomenclature ................................................................................................................. 12
1.5 Products Series .............................................................................................................. 14
1.6 Performance Parameter ................................................................................................. 15
1.7 Operating Range ............................................................................................................ 19
1.8 Refnet ............................................................................................................................ 19
1.9 Outline of Indoor Units ................................................................................................... 21
1.10 Outline of Outdoor Units .............................................................................................. 25
2. Unit Control
2.1 Introduction of the Controller .......................................................................................... 27
2.2 Main Functions ............................................................................................................... 27
2.3 Operation of the Controller ............................................................................................. 28
2.4 Software Management System ...................................................................................... 32
2.5 Network Central Control ................................................................................................. 34
2.6 Wiring Diagram ..............................................................................................................35
2.7 Electric Connection ........................................................................................................ 49
2.8 Electric Data ................................................................................................................... 51
3. Selection
3.1 Load Calculation ............................................................................................................52
3.2 Selection of Indoor Units ................................................................................................ 54
3.3 Selection of Outdoor Units ............................................................................................. 55
3.4 Design of Air System ....................................................................................................... 58
3.5 Selection of Refnet Joint ................................................................................................ 63
3.6 Selection of E-EXV Box ................................................................................................. 66
4. Installation
4.1 Outdoor Unit Installation ................................................................................................ 67
4.2 Indoor Unit Installation ................................................................................................... 70
4.3 Refrigerant Piping Design and Installation ..................................................................... 78
4.4 Design, Processing and Installation of Condensated Drain Pipe ................................... 93
5. Testing
5.1 Hardware Diagram and Configuration ........................................................................... 97
5.2 Trial Run ...................................................................................................................... 104
6. Servicing and Maintenance
6.1 User Guide ................................................................................................................... 105
6.2 Servicing and Maintenance .......................................................................................... 106
7. Fault Code and Troubleshooting ...........................................................110
Annexes .......................................................................................................112
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Design & installation Guide For McQuay MDS Multi System
CHAPTER
1
Overview
1.1 General Information
The MDS(Multi Digital Scroll) air conditioning system is operated by a digital compressor
and is accommodated by multiple evaporators (indoor units). It is touted as the next-
generation modular system in the world of high-efficiency air conditioning. lt has undoubt-
edly changed the face of cooling associated with high-storied buildings. It provides a broad
range of different applications for settings such as offices, hotels and schools. With its easy
installation and simple controlling system, the MDS will more than meet the demands of the
air conditioning market.
1.2 Working Principle & System Principle
1.2.1 Working Principle
The beauty of this technology is its inher-
ent simplicity. The standard digital scroll
compressor has a unique feature called
axial compliance. This allows the fixed
scroll to move in the axial direction, by
very small amounts, to ensure that the
fixed and orbiting scrolls are always
loaded together with the optimal force.
This optimal force holding the 2 scrolls
together at all operating conditions en-
sure the high efficiency of Copeland
scrolls. The Digital Scroll operation builds
on this principle.
The Digital Scroll operates in two stages - the "loaded state", when the solenoid valve is normally
closed and "unloaded state", when the solenoid valve is open. During the loaded state the
compressor operates like a standard scroll and delivers full capacity and mass flow. However,
during the unloaded state, there is no capacity and no mass flow through the compressor.
At this stage, let us introduce the concept of a cycle time. A cycle time consists of a "Loaded State"
time and "Unloaded State" time. The duration of these 2-time segments determine the capacity
modulation of the compressor. Example: In a 20 seconds cycle time, if the loaded state time is 10
seconds and the unloaded state time is 10 seconds, the compressor modulation is (10 seconds x
100% + 10 seconds x 0%)/ 20 = 50%. If for the same cycle time, the loaded state time is 15
fixed scroll
(movable in axial direction)
PWM vale
Orbiting scroll
(Rotatable in radial direction)
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Design & installation Guide For McQuay MDS Multi System
seconds and the unloaded state time is 5 seconds, the compressor modulation is 75%. The
capacity is a time averaged summation of the loaded state and unloaded state. By varying the
loaded state time and unloaded state time, any capacity (10%-100%) can be delivered by the
compressor.
Resident system Commerce system
1.2.2 Sketch Map of Installation
PWM valve power off
Valve close
Fixed scroll move downwards
Two scrolls gather together
Loading
PWM valve power on
Valve open
Fixed scroll moves upwards
Two scrolls separate
Unloading
Modulation chamber
Discharge pressure
Solenoid valve
Bleed hole
Suction pressure
Unloading
Modulation chamber
Discharge pressure
Solenoid valve
Bleed hole
Suction pressure
Loading
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Design & installation Guide For McQuay MDS Multi System
Four-way valve
Outdoor
Filter Filter
Electronic expansion valve
Filter
Filter
PWM
LPS
HPS
Cooling flow
Heating flow
Dry filter
indoor
Electronic expansion valve
Check valve
Digital compressor
Outdoor heat exchanger
Electronic expansion valve
Indoor unit 1Indoor unit n
Accumulator
Liquid receiver
MDS030AR MDS040AR MDS050AR MDS060AR
1.2.3 Diagram of the Unit System
HPS
LPS
PWM
Dry filter
Filter
Filter
indoor
Outdoor
Electronic expansion valve
Filter Filter
Outdoor heat exchanger
Digital compressor
Indoor unit 1
Electronic expansion valve
Indoor unit n
Accumulator
Liquid receiver
MDS030A MDS040A MDS050A MDS060A
Note: The MDS030AR unit excludes the reservoir.
Note: The MDS030A unit excludes the reservoir.
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Design & installation Guide For McQuay MDS Multi System
MDS080BR MDS100BR MDS120BR
Four-way valve
High pressure switch
Standard compressor
Electronic expansion valve
Electronic expansion valve
Check valve
Check valve
Capillary Dry filter
Digital compressor
Low pressure sensor
Filter
Ball valve
Ball valve
Filter
Pressure tapping point
Heat exchanger
Pressure tapping point
Oil separator
Accumulator
MDS150BR
High pressure sensor
Electronic expansion valve
Filter
Low pressure sensor
Pressure tapping point
Filter
Oil separator
Standard compressorStandard compressor Digital compressor
Heat exchanger
High pressure switch
Pressure tapping point
Four-way valve
Capillary Dry filter
Electronic expansion valve
Check valve
Check valve
Ball valve
Ball valve
Accumulator
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Design & installation Guide For McQuay MDS Multi System
MDS200BR MDS220BR MDS240BR
Oil crock
High pressure sensor
Electronic expansion valve
Filter
Low pressure sensor
Pressure tapping point
Filter
Filter
Oil separator
Standard compressorStandard compressorStandard compressor Digital compressor
Heat exchanger
Heat exchanger
High pressure switch
Pressure tapping point
Four-way valve
Four-way
valve
Capillary Dry filter
Electronic expansion valve
Check valve
Check valve
Check valve
Ball valve
Ball valve
Accumulator
MDS180BR
High pressure sensor
Electronic expansion valve
Filter
Low pressure sensor
Pressure tapping point
Filter
Filter
Oil separator
Standard compressorStandard compressor Digital compressor
Heat exchanger
Heat exchanger
High pressure switch
Pressure tapping point
Four-way valve
Four-way
valve
Capillary Dry filter
Electronic expansion valve
Check valve
Check valve
Check valve
Ball valve
Ball valve
Ball valve
Accumulator
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Design & installation Guide For McQuay MDS Multi System
Master unit
Slave unit
High pressure sensor
Filter
Filter
Low pressure sensor
Pressure tapping point
Low pressure sensor
Pressure tapping point
Filter
Filter
Oil separator
Oil separator
Standard compressor Standard compressor Standard compressor
Standard compressor Standard compressor
Heat exchanger
Heat exchanger
High pressure switch
Pressure tapping point
High pressure sensor
High pressure switch
Pressure tapping point
Four-way valve
Four-way valve
Capillary Dry filter
Electronic expansion valve
Capillary
Dry filter
Electronic expansion valve
Electronic expansion valve
Electronic expansion valve
Digital compressor
Check valve
Check valve
Check valve
Check valve
Ball valve
Ball valve
Ball valve
Ball valve
Ball valve
Ball valve
Accumulator
Accumulator
MDS280BR MDS300BR
MDS260BR
Master unit
Slave unit
High pressure sensor
Filter
Filter
Low pressure sensor
Pressure tapping point
Low pressure sensor
Pressure tapping point
Filter
Filter
Oil separator
Oil separator
Standard compressor
Standard compressor Standard compressor
Standard compressor
Heat exchangerHeat exchanger
High pressure switch
Pressure tapping point
High pressure sensor
High pressure switch
Pressure tapping point
Four-way valve
Four-way valve
Capillary Dry filter
Electronic expansion valve
Capillary
Dry filter
Electronic expansion valve
Electronic expansion valve
Electronic expansion valve
Digital compressor
Check valve
Check valve
Check valve
Check valve
Ball valve
Ball valve
Ball valve
Ball valve
Ball valve
Ball valve
Accumulator
Accumulator
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Design & installation Guide For McQuay MDS Multi System
1.3 Main Features
1.3.1 Wide Range and Stepless Capacity Modulation
Wide capacity modulation range 10%-100%)
According to changing the ratio of loading time and unloading time, MDS can modulate
the capacity steplessly
Lower the energy consumption and running cost.
1.3.2 Accurate Temperature Control and Quick Response.
The cooling/heating capacity of the indoor units is controlled by the EXV,
which ensure the low temperature fluctuation of
0.3 ;
Stepless capacity modulation;
Quick response to output the capacity (40s).
1.3.3 Simple, Reliable and Long Life
The PWM valve has the longevity of 40 million times
Wide range of capacity modulation makes sure
the start/stop times reduces
Less components
No complicate inverter controller
The compressor 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.
100%
Running ratio of compressors(%)
Inverter system
MDS system
Total capacity of operating indoor units(%)
System control
Environment
Solenoid valve
Digital scroll
Time
Temp
Time
Temp
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Design & installation Guide For McQuay MDS Multi System
Traditional air
conditioning system
Traditional
inverter system
MDS system
Digital
compressor operating
Digital
compressor operating
10HP system
HLLoad
Nominal capacity
compressor
100% operating
1.3.4 Energy Saving
The inverter system capacity modulation range is from 30% to 100%, while MDS system
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.
1.3.5 Flexible Combination of Indoor Units
Max. capacity of the indoor units can reach 130% capacity of the outdoor unit;
Number of the indoor units connected to the outdoor unit depends on the capacity of the outdoor
unit;
One outdoor unit can be connected up to 48 indoor units;
Various types of indoor units are available according to the decoration of the room;
There are various indoor units for option: ceiling cassette, ceiling concealed, high static
pressure duct and ceiling exposed/floor standing.
1.3.6 Reliable Long Piping Connection Design
Max. piping length is 150m (12HP-30HP), max. height between outdoor unit and indoor
unit is 50m (8HP-30HP).
○○
Note OT means the outdoor unit is above the indoor unit. IT means the outdoor unit is below the indoor unit.
Max. piping total Max. piping
Height(m)
length(m) length(m)
OT IT
12~30HP 350 150 50 40
8~10HP 250 125 50 40
5~6HP 150 70 30 30
4HP 150 70 20 20
3HP 100 50 20 20
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Design & installation Guide For McQuay MDS Multi System
Indoor unit: Ceiling exposed/floor standing unit
1.3.7 Space Saving
Compared to traditional central air conditioning, MDS system is higher centralized, no need
for special equipment room to save more space, and bring more benefits.
1.3.8 Easy to Install and Simple to Maintain
Easy installation
MDS system is simple, and the pipe layout is clear. The site installation is accompanied by
little workload of easy indoor and outdoor units installation and pipe connection. The installa-
tion involves refrigerant piping system, and the maintenance is easy.
Independent system, installed by stages
Easy installation allows the owner to choose a suitable time for the MDS system installa-
tion in a longer period, greatly reducing the time limitation on the air conditioner installation
during the construction stage;
For new projects, installation by stages can reduce lump-sum investment;
For alteration projects, it is easy for the owner to install.
No need for special maintenance
It only involves simple refrigerant piping system , without complex maintenance;
Compared with the water-cooled system, it has no water system. So, there is no need to clean
water pipes, separate contaminant and maintain water system control devices. It is easy to use and
it is not required to assign dedicated personnel to manage and maintain.
Traditional central air conditioning MDS system
1.4 Nomenclature
Indoor unit: ceiling cassette
M CM 050 T - A M A
Design alternation No.
Matching outdoor units: MDS series
Power supply features: A:220V
/50Hz
Design serial No.
Cooling capacity No.
Indoor unit: Ceiling exposed/floor standing unit
McQuay
McQuay
Indoor unit: ceiling cassette
Cooling capacity No.
Design serial No.
Power supply features:220V
/50Hz
Matching outdoor units:MDS series
Design alternation No.
M CK 030 T - A M A
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Design & installation Guide For McQuay MDS Multi System
Indoor unit: ceiling concealed unit
Hot water heater box
Electric heater box
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
T means that unit can be used in MCC T series
Hot water heater box
HW T 08-15
HD P 1.2 T 08-15
18-15 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
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
M CC 050 T -R (B)/(D)- A M A
McQuay
Ceiling concealed indoor unit
Cooling capacity No.
Design serial No.
Type of connecting pipe:
R-right connecting pipe
L-left connecting pipe
Air return mode:
B-rear air return plenum
D-lower air return plenum
Omitted-no air return plenum
Design alternation No.
Matching outdoor units:
MDS series
Power supply features:
A:220V /50Hz
Air-cooled cooling duct indoor unit
M DB 050 T- A M A
Design serial No.
Cooling capacity No.
Air-cooled cooling duct indoor unit
McQuay
Design alternation No.
Matching outdoor units:MDS series
Power supply features: A:220V /50Hz
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Design & installation Guide For McQuay MDS Multi System
1.5 Products Series
1.5.1 Outdoor Unit
Capacity range
3HP 4HP 5HP 6HP 8HP 10HP 12HP 15HP 18HP 20HP 22HP 24HP 26HP 28HP 30HP
Model
MDS-A
MDS-B
MDS-B
Outdoor unit: MDS unit
MDS 060 A R- F AA
Design serial No.
Cooling capacity No.
McQuay multi digital scroll unit
Description of the unit
Power supply:
A:220V /50Hz F:380V/3N /50Hz
Heat pump (omitted if cooling only)
MEX throttle box
Design serial No.
Pipe mode
Pipe size
MEX - 14 - 3 SA - A
McQuay expansion box
Valve opening size No.
Indoor unit: Wall Mounted Indoor Units
M WM 015 T - A M A
Design alternation No.
Matching outdoor units: MDS series
Power supply features: A:220V /50Hz
Design serial No.
Cooling capacity No.
Indoor unit: Wall Mounted Indoor Units
McQuay
________
MEX:Throttle box (one expansion valve)
________
Nominal diameter value 10
________
2:1/4 inch
3:3/8 inch
4:1/2 inch
________
Flare fitting & nipple joint
________
Primary design
McQuay
Valve opening size No.
Pipe size:
Pipe mode:
Design serial No.
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Design & installation Guide For McQuay MDS Multi System
1.6 Performance Parameter
1.6.1 Ceiling Concealed
1.5.2 Indoor Products
Notes:
The nominal cooling capacity is gotten in the return air temperature of 27 /19 , and the ambient temperature of 35 /24 .
The nominal heating capacity is gotten in the return air temperature of 20 /15 , and the ambient temperature of 7 /6 .
The sound level is gotten from the test room, it may differ in actual use due to the ambient noise or other causes.
The above parameters are the parameters of the heat- pump unit.
Notes:
The nominal cooling capacity is gotten in the return air temperature of 27 /19 , and the ambient temperature of 35 /24 .
The nominal heating capacity is gotten in the return air temperature of 20 /15 , and the ambient temperature of 7 /6 .
The sound level is gotten from the test room, it may differ in actual use due to the ambient noise or other causes.
Model
Indoor MCC MCC MCC MCC MCC MCC MCC MCC MCC MCC
unit
008T 010T 015T 018T 020T 025T 030T 040T 050T 060T
Cooling
W
2000 2500 3650 4500 5600 6500 7800 10600 12400 14400
capacity
Heating
W
2200 2600 3700 4700 6100 7400 8900 11600 14500 17300
capacity
Nominal input W 47 47 81 82 82 123 158 276 276 280
Power supply 220V
/50Hz
Air
High m
3
/h 450 450 580 800 800 960 1200 1900 1900 2100
flow Medium m
3
/h 370 370 470 650 650 780 950 1520 1520 1750
Low m
3
/h 280 280 380 540 540 600 800 1300 1300 1460
ESP Pa 15(0/30/50)
30(15/50/70)
50(15/30/70)
Dimension mm 1030x469x220 1290x490x250 1640x490x250
1900x490x250
Weight kg 22 22 22 25 25 27 28 39 39 45
Sound(High/
dB (A)
31/29/27 31/29/27 34/32/30 35/32/29 35/32/29 37/36/35 42/40/38 47/45/43 47/45/43 48/46/44
medium/Low)
Piping
Liquid pipe
mm(in)
6.35 (1/4 )6.35 (1/4 )6.35 (1/4 )9.52 (3/8 )9.52 (3/8 ) 9.52(3/8 ) 9.52(3/8 ) 9.52(3/8 ) 9.52(3/8 ) 9.52(3/8 )
size
Gas pipe
mm(in)
9.52 (3/8 )9.52 (3/8 ) 12.7 (1/2 ) 15.88(5/8 ) 15.88(5/8 ) 15.88(5/8 ) 15.88(5/8 ) 19.05(3/4 ) 19.05(3/4 ) 19.05(3/4 )
Drainage pipe
inch R3/4
1.6.2 High Static Pressure Duct Unit
Model Indoor unit Indoor unit MDB050T MDB060T
Nominal cooling capacity W 12500 14000
Nominal heating capacity W 14000 16500
Nominal input W 615 789
Power supply 220V
/50Hz
Air flow(High/Medium/Low) m
3
/h 2550/2040/1650 3000/2540/1920
ESP Pa 100 100
Dimension mm 1230
910 350 1430 910 350
Weight kg 69 75
Sound Level(High/Medium/Low) dB(A) 58/55/52 60/56/53
Liquid pipe outside diameter
mm(in) 9.52(3/8 )9.52(3/8 )
Piping size Gas pipe outside diameter
mm(in) 19.05(3/4 ) 19.05(3/4 )
Drainage pipe inch R3/4
Capacity range
0.8HP 1.0HP 1.5HP 1.8HP 2.0HP 2.5HP 3.0HP 4.0HP 5.0HP 6.0HP
MCC
MCK
MCM
MDB
MWM
Model
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Design & installation Guide For McQuay MDS Multi System
Notes:
The nominal cooling capacity is gotten in the return air temperature of 27 /19 , and the ambient temperature of 35 /24 .
The nominal heating capacity is gotten in the return air temperature of 20 /15 , and the ambient temperature of 7 /6 .
The sound level is gotten from the test room, it may differ in actual use due to the ambient noise or other causes.
1.6.4 Ceiling Exposed / floor Standing
Notes:
The nominal cooling capacity is gotten in the return air temperature of 27 /19 , and the ambient temperature of 35 /24 .
The nominal heating capacity is gotten in the return air temperature of 20 /15 , and the ambient temperature of 7 /6 .
The sound level is gotten from the test room, it may differ in actual use due to the ambient noise or other causes.
1.6.3 Ceiling Cassette
Model
Indoor unit MCK010T MCK015T MCK018T MCK020T MCK025T MCK030T MCK040T MCK050T
Nominal cooling capacity
W 2800 3600 4500 5400 6500 7500 10000 12500
Nominal heating capacity
W 3200 3900 5000 5900 7200 8000 11000 13500
Nominal input W 26 34 36 42 75 84 110 140
Power supply 220V
/50Hz
High m
3
/h 520 600 650 700 1200 1300 1360 1650
Air flow Medium m
3
/h 430 520 550 600 1100 1060 1200 1450
Low m3/h 380 430 400 530 960 850 1110 1350
Dimension mm 930X930X278 930X930X363
Weight kg 26 30 39.5
Sound(High/medium/Low)
dB(A) 29/28/26 32/30/27 38/34/30 39/35/31 42/40/38 45/43/41 46/44/42 48/45/42
Piping
Liquid pipe
mm(in) 6.35(1/4 )9.52(3/8 )9.52(3/8 )
Size
Gas pipe
mm(in)
9.52(3/8 ) 12.7(1/2 )
15.8(5/8 ) 19.05(3/4 )
Drainage pipe mm 20.5
Model Indoor unit MCM020T MCM030T MCM050T
Cooling capacity W 5800 7500 12500
Heating capacity W 5800 8000 13500
Air flow(High/Medium/Low) m
3
/h 1100/970/750 1300/1100/870 1850/1550/1200
Rated power input W 81 116 161
Power supply 220V
/50Hz
Dimension mm 1214x670x214 1214x670x249 1714x670x249
Weight kg 39 44 44
Sound(High/medium/Low) dB(A) 48/45/42 50/46/43 52/48/44
Liquid pipe outside diameter
mm(in) 9.52(3/8 )9.52(3/8 )9.52(3/8 )
PiPing
Gas pipe outside diameter
mm(in) 15.88(5/8 ) 15.88(5/8 ) 19.05(3/4 )
Size
Drain pipe mm
20.5
Model Indoor unit MWM008T MWM010T MWM015T MWM020T MWM025T
Cooling capacity W 2200 2780 3520 5400 6500
Heating capacity W 2200 2780 3520 5400 6500
Air flow(High/Medium/Low) m
3
/h 460/330/270 510/420/320 590/500/370 860/720/590 1100/790/680
Rated power input W24 36 404868
Power supply 220V~/50Hz
Dimension(WxDxH) mm 799x198x260 899x198x260 899x198x260 1062x222x3041062x222x304
Weight kg 25 30 35 36 36
Sound(High/medium/Low) dB(A) 39/34/28 39/34/28 42/36/29 44/40/35 49/43/40
PiPing
Liquid pipe outside diameter
mm(in.) 6.35(1/4) 6.35(1/4) 6.35(1/4) 6.35(1/4) 9.52(3/8)
Size
Gas pipe outside diameter
mm(in.) 9.52(3/8) 9.52(3/8) 12.7(1/2) 15.88(5/8) 15.88(5/8)
Drain pipe
20.5
1.6.5 Wall Mounted Indoor Units
Notes:
The nominal cooling capacity is gotten in the return air temperature of 27 /19 , and the ambient temperature of 35 /24 .
The nominal heating capacity is gotten in the return air temperature of 20 /15 , and the ambient temperature of 7 /6 .
The sound level is gotten from the test room, it may differ in actual use due to the ambient noise or other causes.
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Design & installation Guide For McQuay MDS Multi System
Notes:
The nominal cooling capacity is gotten in the return air temperature of 27 /19 , and the ambient temperature of 35 /24 .
The nominal heating capacity is gotten in the return air temperature of 20 /15 , and the ambient temperature of 7 /6 .
The specification parameters may change with the product improvement; Please take the parameters listed in the nameplate
of the unit as the reference parameter.
Notes:
The nominal cooling capacity is gotten in the return air temperature of 27 /19 , and the ambient temperature of 35 /24 .
The nominal heating capacity is gotten in the return air temperature of 20 /15 , and the ambient temperature of 7 /6 .
The specification parameters may change with the product improvement; Please take the parameters listed in the nameplate
of the unit as the reference parameter.
Model Unit MDS050A MDS050AR MDS060A MDS060AR
Nominal cooling capacity kW 12.5 12.5 15 15
Nominal heating capacity kW - 13.5 - 17
Power supply 380V/3N~/50Hz
Dimension (L x W x H) mm 1058x430x1044 1058x430x1247
Weight kg 117 120 123 130
Cooling rated power input kW 4.4 4.4 5.0 5.0
Cooling rated current A 8.4 8.4 9.6 9.6
Heating rated power input kW - 4.2 - 4.23
Heating rated current A - 8.0 - 8.8
Refrigerant R22
Type of connecting pipe
Liquid pipe Copper flare fitting & nipple joint
Gas pipe Copper flare fitting & nipple joint
Piping size
Liquid pipe
(mm/in) 9.52(3/8 )
Gas pipe
(mm/in) 19.05(3/4 )
1.6.6 MDS-A Specification(Outdoor Unit)
Model Unit MDS030A MDS030AR MDS040A MDS040AR MDS050A MDS050AR MDS060A MDS060AR
Nominal cooling capacity kW 8.5 8.5 10 10 12.5 12.5 14.5 14.5
Nominal heating capacity kW - 9.0 - 11.5 - 13.5 - 16.5
Power supply 220V~/50Hz
Dimension (L x W x H) mm
Weight
kg 82 85 112 115 117 120 123 130
Cooling rated power input
kW 3.0 3.0 3.5 3.6 4.4 4.4 5.0 5.0
Cooling rated current
A 13.6 13.6 15.9 15.9 20 20 22.8 22.8
Heating rated power input
kW - 2.5 - 3.4 - 4.2 - 4.2
Heating rated current
A- 11.4 - 15.5 - 19 - 20.3
Refrigerant
R22
Type of connecting pipe
copper flare fitting & nipple joint
Liquid pipe
(mm/in)
Gas pipe
(mm/in)
840x408x900 1058x430x1044 1058x4230x1247
9.52(3/8
)9.52(3/8 )9.52(3/8 )9.52(3/8 )
15.88(5/8
) 19.05(3/4 ) 19.05(3/4 ) 19.05(3/4 )
Piping size
-18-
Design & installation Guide For McQuay MDS Multi System
1.6.7 MDS-B Specification (Outdoor Unit)
Model
MDS MDS MDS MDS MDS MDS MDS MDS MDS MDS MDS MDS
080B 080BR 100B 100BR 120B 120BR 150B 150BR 180B 180BR 200B 200BR
Nominal cooling capacity kW 24.5 24.5 28.0 28.0 32.5 32.5 40.0 40.0 47.5 47.5 50.0 50.0
Nominal heating capacity kW - 26.0 - 30.0 - 34.0 - 43.0 - 50.0 - 53.0
Power supply 380V/3N
/50Hz
Sound level dB(A) 62 62 64 64 66 66 67 67 66 66 66 66
Dimension (Lx W x H) mm 990x840x1840
1290x840x1840
1990x840x1840
Weight kg 275 290 285 300 290 305 355 370 520 550 560 590
Cooling rated power input kW 7.5 7.5 8.5 8. 5 9.8 9.8 12.9 12.9 14.1 14.1 15.2 15.2
Cooling rated current A 14.6 14.6 16.8 16.8 18.8 18.8 23.1 23.1 28.2 28.2 31.1 31.1
Heating rated power input k W - 7.2 - 8. 3 - 9. 0 - 11.1 - 13.2 - 14.7
Heating rated current A - 13.6 - 15.7 - 16.7 - 22.6 - 27.1 - 29.4
Refrigerant R22
Type of con-
Gas side Welding & flange
necting pipe
Liquid side Flare fitting & nipple joint
Liquid pipe
mm(in) 12.7(1/2 ) 15.88(5/8 )
Gas pipe
mm(in) 28.6(1-1/8 ) 34.9(1-3/8 )
Notes:
The nominal cooling capacity is gotten in the return air temperature of 27 /19 , and the ambient temperature of 35 /24 .
The nominal heating capacity is gotten in the return air temperature of 20 /15 , and the ambient temperature of 7 /6 .
The sound level is gotten from the test room, it may differ in actual use due to the ambient noise or other causes.
Model
MDS MDS MDS MDS MDS MDS MDS MDS MDS MDS
220B 220BR 240B 240BR 260B 260BR 280B 280BR 300B 300BR
Nominal coolingcapacity kW 55.0 55.0 65.0 65.0 70.0 70.0 75.0 75.0 80.0 80.0
Nominal heating capacity kW - 58.0 - 68.0 - 75.0 - 80.0 - 85.0
Power supply 380V/3N
/50Hz
Sound level dB(A) 66 66 68 68 68 68 69 69 69 69
Dimension (L x W x H) mm 1990x840x1840
2280x840x1840
2580x840x1840
Weight kg 560 590 570 600 645 675 710 740 710 740
Cooling rated power input kW 16.7 16.7 19.8 19.8 21.3 21.3 22.8 22.8 26.2 26.2
Cooling rated current A 32.7 32.7 38.5 38.5 40.0 40.0 42.5 42.5 46.5 46.5
Heating rated power input kW - 16.2 - 18.5 - 20.9 - 22.0 - 23.6
Heating rated current A - 31.0 - 33.8 - 37.2 - 41.0 - 43.1
Refrigerant R22
Type of con-
Gas side Welding & flange
necting pipe
Liquid side Flare fitting &nipple joint
Liquid pipe
mm(in) 19.05(3/4 ) 19.05(3/4 )
Gas pipe
mm(in) 38.1(1-1/2 ) 41.3(1-5/8 )
-19-
Design & installation Guide For McQuay MDS Multi System
1.7 Operating Range
Note The table is gotten based on the equivalent length of 16m and the height is 0 m.
1.8 Refnet
1.8.1 Y Type
Unit mm
Length(mm) Diameter (mm) Diameter (mm) Diameter (mm)
Refnet
AB C D
E(outer
FGH
I(outer
JKLM
N(outer
OPQR
model
diameter diameter diameter
MDS-Y1 553 172 293 120 28.6 28.9 25.7 22.5 28.6 28.9 25.7 22.5 19.3 22.2 19.3 16.1 12.9 9.7
MDS-Y2 420 142 223 80 15.88 16.1 12.9 9.7 12.7 12.9 9.7 6.5 12.7 12.9 9.7 6.5
MDS-Y3 420 142 223 80 15.88 16.1 12.9 9.7 12.7 12.9 9.7 6.5 15.88 16.1 12.9 9.7
MDS-Y4 493 142 223 80 22.2 22.5 19.3 16.1 19.1 19.3 16.1 12.9 9.7 19.1 19.3 16.1 12.9
-20-
Design & installation Guide For McQuay MDS Multi System
1.8.2 C Type
Unit: mm
Type: MDS-C1
Type: MDS-Y5
Unit: mm
-21-
Design & installation Guide For McQuay MDS Multi System
1.9 Outline of Indoor Units
1.9.1 MCK010 050T
L
M
J
H
B
D
A
C
F
E
G
K
T
OD ͺ9.7
204
80 8080
OD ͺ12.9
OD ͺ16.1
OD ͺ19.3
250
550
E
D
C
B
A
Refnet joint type ͺ(mm)
Refnet
joint type
MDS-C2
MDS-C3
28.6
A(outer
diameter)
25.4
28.9
B
25.7
25.7
C
22.5
22.5
D
19.3
19.5
16.1
E
Four places of silver
& copper brazed
Unit: mm
Unit: mm
Type: MDS-C2/C3
Model A B C D E F G H I J K L M
MCK010 020T
820 875 548 820 278 250 28 930 930 642 622 555 555
MCK025 050T
820 875 548 820 363 335 28 930 930 642 622 555 555
-22-
Design & installation Guide For McQuay MDS Multi System
1.9.2 MDB050T
350
340
823
702
1063
1032
998
957
995
1230
6-11.5x20
302
286
823
57
910
80
177
173
1.9.3 MDB060T
1430
350
302
286
823
57
910
80
177
173
1157
1195
1232
1198
1263
340
702
823
6-11.5x20
Unit: mm
Unit: mm
-23-
Design & installation Guide For McQuay MDS Multi System
1.9.4 MCC008 010 015 018 020 025 030 040 050 060T
1.9.5 MCM020T MCM030T MCM050T
A
B
C
D
EF
G
H H
J
N
KL
M
Unit: mm
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
20
253
141
151
1
G
J
A
B
C
5218737
47
D
F
F
75
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 950 981 1314 1005 32 248 490 81 14 251 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 81 14 251 3
MCC050T 1300 1331 1664 1355 32 248 490 81 14 251 3
MCC060T 1560 1591 1924 1615 32 248 490 81 14 251 4
-24-
Design & installation Guide For McQuay MDS Multi System
1.9.6 Auxiliary Heating Coil
Model A B C D
HWT08-15 762 704 732 818
HWT18-30 1022 964 992 1078
HWT40-50 1372 1314 1342 1438
HWT60 1632 1574 1602 1688
Unit: mm
1.9.7 Auxiliary Electric Heating Box
Unit: mm
Water inlet
Water outlet
Rc3/4 taper pipe threads
D
167
15
237
119
15
97
32
41
143
32
221
long hole for Mounting 4 - 10ġ20
A
B
15
37
163
3333
161
222
32
97
8-6x10
15
long hole for Mounting 4 - 10ġ20
C
B
A
38 38
173
37
1104
Power supply
cable inlet hole
15
237
15
Model A B C D
HDP1.2T08-15/HDP2.4T08-15 762 704 732 844
HDP2.4T18-30/HDP3.6T18-30 1022 964 992 1104
HDP2.4T40/HDP3.6T40/HDP4.8T40-50/HDP7.2T40-50 1372 1314 1342 1454
HDP5.4T60/HDP7.2T60/HDP10.8T60 1632 1574 1602 1714
-25-
Design & installation Guide For McQuay MDS Multi System
1.10 Outline of Outdoor Units
1.10.1 MDS030A(R)
1.10.2 MDS040A(R) MDS050A(R) MDS060A(R)
Unit: mm
Unit: mm
Model H1 H2
MDS040A(R) 1024 1044
MDS050A(R) 1024 1044
MDS060A(R) 1222 1242
840
590
900
460
20
4-12x18
125
378
318
408
330
240
124
50
6760
390
94
816
1006
H1
H2
128
67
11594
356
430
4-15
-26-
Design & installation Guide For McQuay MDS Multi System
1.10.3 MDS080B(R) MDS100B(R) MDS120B(R) MDS150B(R)
B
45
265
1575
A
Amplify here A-A
A-A
8-14x20 screw hole
(for setting)
170
845
877
16
840
14
20
1840
539
1.10.4 MDS180B(R) MDS200B(R) MDS220B(R) MDS240B(R)
D
101 101
845
16
45 45
265
1575
1840
CC
170 170
16
4-14x20 screw hole
(for setting)
1.10.5 MDS260/280/300B(R) are Combined Units,Made up by a Master Unit and a Slave Unit
Unit: mm
Model A B
MDS080B(R) 900 990
MDS100B(R) 900 990
MDS120B(R) 900 990
MDS150B(R) 1200 1290
Model Master unit+Slave unit D
MDS260B(R) MDS120B(R)+MDS150B(R)S 990+10+1290
MDS280B(R) MDS150B(R)+MDS130B(R)S 1290+10+1290
MDS300B(R) MDS150B(R)+MDS150B(R)S 1290+10+1290
Unit: mm
Model C D
MDS180B(R) 950 1990
MDS200B(R) 950 1990
MDS220B(R) 950 1990
MDS240B(R) 950 1990
-27-
Design & installation Guide For McQuay MDS Multi System
CHAPTER
2
Unit Control
2.1 Introduction to the Controller
MDS system is controlled by the micro-computer. Several types of controller are available,
including wireless controller, wire controller, wire controller + remote controller and central
controller. One wireless controller can control one unit, one wire controller can control one unit
or up to 48 units, while central controller can control up to 1536 units (32 groups).
2.2 Main Functions
Cooling./heating/auto/air supply/dehumidity mode are available
LCD wired controller and remote control are available, or remote control only
Digital scroll compressor is used for load balancing to reduce the start/stop times of the
constant-capacity compressor.
Electronic expansion valve is used to control the refrigerant flow
One outdoor unit can connect up to 48 indoor units
Internetworking control is available
Both the indoor and outdoor units have three-speed
Timer for ON/OFF
Energy saving can be setting when the unit is running in cooling or heating condition
High/low pressure protection for the compressor
Overload protection for the fan motor in indoor unit and outdoor unit
Anti-icing function for the coil of indoor unit
Function of auto restart after power
Auto defrost and manual defrost can be set
Auto check function for the sensor malfunction
Overheat protection for the coil of indoor unit
Three minutes delayed protection when auto restart after power failure
Malfunction indicating
Temperature unit can be or oF.
-28-
Design & installation Guide For McQuay MDS Multi System
2.3 Operation of the Controller
2.3.1 Main Features
Both wired controller (using the key on board) and remote controller (equipped with infrared receiver
to receive the order from the remote controller ) to control the unit, and to perform such functions as
parameter setting, working mode setting, status display and malfunction indicating.
Features:
Working mode:
Cooling only unit: Cooling/air supply/dehumidity;
Heat pump unit: Cooling/heating/air supply/dehumidity.
Indoor units have several speed: Auto/ Low/ Medium/ High.
Temperature setting range: 16 /61 oF 30 /78 oF.
Timer for ON/OFF. Max. time is 24 hours.
Sleep.
Auxiliary electric heater & hot water heater control and the wind wing function.
LCD indicator is available to slow the setting temperature, working mode, real time, week, and
status of the units.
2.3.2 Operation of the Wired Controller
Buttons on the wired controller panel
POWER
RUN
Reset button
Fan M ode
Sleep
Heating/
wind wing
CLK button
Timer
Tem perature
ON/OFF
LCD
vision window
Operation manual
The omitted parameter
When the function of auto restart after power failure is not active: The unit is OFF and the temp
is 24 /75 oF cooling mode, high speed, no sleep function, no defrost, no wind wing, no
electric heater.
When the function of auto restart after power failure is active: the unit is the same as that before
power failure.
Temp setting
In normal mode condition, press
or to increase or reduce the temp by 1 or 1 oF.
Temp adjustment range is 16-30
(or 61-86 oF). When the temp reach the upper limit or floor
limit, the
or is invalid.
-29-
Design & installation Guide For McQuay MDS Multi System
Temp unit setting
There is a switch on the PCB board. When switch OP1 is ON, the unit is
; when it is OFF, the
unit is oF.Alternate method is as follows: Press fan key and last for 5 seconds in the normal
condition, the temp unit setting will be successful and there will be a buzzer to indicate.
Real time setting
Press CLK to enter, the first time is week setting and indicate its icon, press or
to adjust the week from Sunday to Saturday. If there is no press on any key within 5 seconds,
the unit will exit from the real time setting and back to the normal status. If you press CLK one
more time within 5 seconds, the setting will be OK and it is the real time setting icon, as well as
the light is twinkling. At this time, you can press
to increase the hour while press to
increase the minute. If there is no press on any key within 5 seconds, the unit will exit from the
real time setting and the time setting is valid. If you want to confirm the setting, you need to press
CLK one more time. If any other key is press during the setting, the system will exit and back
to the normal condition without saving
Mode setting
When the unit is in off status, you can press Mode to enter and the current mode is twinkling.
The mode will be changed when you press Mode one more time. The mode changing
sequence is as follows:
When outdoor unit is OFF:
Heat pump: Cooling ,heating, air supply, dehumidifying, cooling
Cooling only: Cooling, air supply, dehumidifying, cooling
When outdoor is in cooling condition: Cooling, air supply, dehumidifying, cooling
When outdoor is in heating condition: Heating, air supply, heating
Note: In one system, the follows are not available: some units are in cooling condition while the other
is in heating condition.
Air flow setting
In normal condition, when the Fan key is pressed, the air flow will be changed as the following
sequence: High, Auto, Low, Medium, High. When the unit is in air supply condition, there is no
Auto function.
Sleep
Press Sleep key, the icon will be ON or OFF.
Setting of auto restart after power failure
There is a switch on the PCB board to fulfill the setting of auto restart after power failure.
When OP2 is set
ON , then this function is active and the icon is shown on the LCD.
Manual defrost
When the unit runs in heating mode condition, press
Heater key and last for 5 seconds, you
will enter manual defrost mode , and Defrost mode is shown on the LCD. When it is auto
defrost, Defrost mode is also shown on the LCD and it will disappear when the defrost
finishes.
-30-
Design & installation Guide For McQuay MDS Multi System
Timer setting
Press
Timer to enter timer setting (When the unit is ON, it can only be set to OFF;
When the unit isOFF , it can only be set to ON) and last timer will be shown on the LCD.
If there is no press on any key within 5 seconds, it will exit and cancel the timer setting at
the same time. During this 5 seconds, press
to increase the hour while
press to increase the minutes, please press Timer within 5 seconds
to confirm the setting.When it is timer setting, the system will show the real time and the
setting time on the LCD. When the setting time is reaching, the unit will be Power on or off,
and the timer setting function is cancel. When you need the timer setting function, you
need to reset.
Keyboard locked and unlocked setting
Press Sleep and last for 5 seconds, the keyboard will be alter between locked and
unlocked. When it is locked, a icon will be shown on the LCD. During the locked stage, only
the ON/OFF keyboard is valid.
ON/OFF setting
Press ON/OFF keyboard, the unit will be alter between ON and OFF, and a relative
icon will be shown on the LCD.
Reset
This keyboard is used to restart the unit because of some uncertain factors.
Remote controller
The remote controller can be used with the wire controller and it has the same
keyboard as the wire controller, But the keyboard
Fan , Sleep , Heater do not
have the second function.
Central control
The units can be central controlled by the computer or centralized controller. When it is
locked, the keyboard on the wire controller is invalid and the key icon is twinkling. It can only
be unlocked by the computer or by the centralized controller. When it is central control, the
wire controller can communicate with the computer and the centralized controller.
-31-
Design & installation Guide For McQuay MDS Multi System
2.3.3 Wire Control Panel
2.3.4 Outline and Dimension
2.3.5 Installation Type
concealed installation
Unit mm
Heat
Fan
ON/OFF
Tem p .
Sleep
Timer Mode
8
6
RUN
POWER
ON/OFF
LCD
Fan
Mode
SleepHeat
Timer
Tem p .
53
120
20
120
For three speed
unit with auxiliary
heater
For single speed
unit with auxiliary
heater
Fan ON/OFF
Te mp .
Fan ON/OFF
Te mp .
Fan ON/OFF
Temp.
Fan ON/OFF
Te mp .
Fan ON/OFF
Te mp .
Fan speed
Sleep
TimerMode
Sleep
Timer Mode
Sleep
Timer Mode
Heat
Sleep
Timer Mode
Heat Sleep
Timer Mode
For three-speed unit
with wind wing
For the cooling and
heat pump unit with
three-speed
For the cooling and
heat pump unit with
single-speed
-32-
Design & installation Guide For McQuay MDS Multi System
2.4 Software Management System
2.4.1 Real-time Monitor Software
System monitoring software: The real-time MDS unit monitoring software features powerful
functions, including indoor monitoring, system monitoring, loop monitoring and service monitoring.
With it, the user or service debugging personnel can view detailed unit parameters and have a
deep understanding of the unit operation.
Main control functions:
Indoor monitoring
Set indoor unit mode/wind speed/auxiliary setting/tem-
perature and ON/OFF. (You can select to operate on
multiple units or multiple groups of units at the same time)
Both indoor and outdoor units can be set in different groups
by self-defining. (The default group is set according to
outdoor unit)
Alarm display and alarm information query. (you can choose
outdoor unit No. or indoor unit No. to query the corresponding
malfunction)
Set timer mode and indoor unit timer mode. (The timer mode
can be set without limit and can be stored)
System monitoring
Display the model and status (such as alarm and timing) of all indoor units in the system
Indoor
Icon
unit model
Stop: Cooling Heating Dehumidity Air vent
MCC
MCK
MCM
MDB
Introduction of the units
Indoor icon instruction
Small icon
Introduction
The timer function
has been started.
The line controller has
been locked, we can not
use it to control the indoor units at this time.
There is malfunction in this
indoor unit, double-click the
icon to know the details.
-33-
Design & installation Guide For McQuay MDS Multi System
The unit selection software developed on the basis of unit model allows you to select and verify
units as required by customers, and collect statistics on the model of indoor/outdoor units and
the usage of refnet joints and copper pipes . In this way, the complicated unit design and model
selection can be achieved easily.
Loop monitoring*
Select and view the outdoor unit
s system
figure, operation parameters and the operation
parameters of all indoor units.
Service monitoring*
Display the current operation parameters
and history record curve of indoor/outdoor
unit in the system.
Note: Only the authorized maintenance personnel can operate on this interface
2.4.2
Unit Selection Software
-34-
Design & installation Guide For McQuay MDS Multi System
2.5 Network Central Control
One outdoor unit can be connected with maximum 48 indoor units.Control over up to 32
outdoor units can be realized by a centralized controller, and the monitoring software monitors
up to 1536 (32x48) units simultaneously in real time.The cabling of outdoor and indoor units
is simple.The MDS system features powerful fault display and query function greatly saving
the maintenance time and costs.
The real time monitor software of MDS is developed by McQuay and has huge performance.
It can monitor each unit in the system and set the parameter in accordance with the
requirement. It can also show the malfunction information, which can save the customer a lot
of time and money.
Outer coil
Four-way valve
high pres-
sure switch
PWM valve
Low pres-
sure valve
Discharge temperature 101.6ņ
Unit selection
Ambient temperature
Outdoor status
Output capacity
Communication status
normal
Unit nj
Run time
Suction temperature: 20.2ņ
Bottom temperature: 33.8ņ
DigitalStandard
99.7ņ
44.4ņ
44.1ņ
29.0ņ
29.5ņ
2
9
.4
ņ
1
1
.0
ņ
1
0
.0
ņ
1
2
.8
ņ
29.3
ņ
29.2
ņ
29.2
ņ
6.0P
30.0
ņ
2
5
.7
ņ
2
6
.4
ņ
2
7
.2
ņ
1
9
.0
ņ
2
1
.5
ņ
1
6
.7
ņ
2
6
.9
ņ
1
8
.7
ņ
2
5
.3
ņ
1
7
.2
ņ
1
9
.0
ņ
2
6
.3
ņ
2
6
.3
ņ
30.7ņ
28.4ņ
29.6ņ
16.8ņ
15.7ņ
17.2ņ
27.5ņ
19.7ņ
19.1ņ
19.5ņ
24.1ņ
28.5ņ
28.8ņ
nj
1
2
3
4
5
6
7
12
13
8
14
15
11
9
10
38.3ņ
6: 18: 30
Inlet
Mid-let
outlet
Return air
Inlet
Mid-let
outlet
Return air
Inlet
Mid-let
outlet
Return air
Inlet
Mid-let
outlet
Return air
Inlet
Mid-let
outlet
Return air
Inlet
Mid-let
outlet
Return air
Inlet
Mid-let
outlet
Return air
cooling
-35-
Design & installation Guide For McQuay MDS Multi System
2.6 Wiring Diagram
2.6.1 Wiring Diagram of Indoor Units
Model MCC008/010/015/018/020/025/030/040/050/060T
OFF
ON
OFF
OFF
OFF
OFFOFFOFF OFF
OFF OFF
008
OFF
ON
OFF
ON
OFF
OFFOFF OFF OFF
OFF
060
ON OFF
OFFOFF OFF OFF
ON
OFF
050
OFFOFF OFF OFF
ON
040
ONOFF
OFFOFF OFF OFF
ON
ONOFF
030
OFF
OFFOFF OFF OFF
OFF
ON
025
OFF
OFFOFF OFF OFF
ON
020
OFF
OFFOFFOFFOFF
OFFONON
OFF
OFFOFFOFFOFF
OFFOFF
ON
OFF OFF
OFF
SW3.8
SW1.6SW1.4 SW1.5SW1.1 SW1.2
DIP switch SW1 settings:
SW1.3
SW3.5 SW3.6
OFF OFF
SW3.3 SW3.4
010
015
ON
SW3.1
Model
018
SW3.2
OFF
DIP switch SW3 settings:
OFF
OFF
OFF
OFF OFF OFF
SW3.7
OFF
N
N
L
(220V~/50Hz)
DIPON
12 438765
JP4JP3JP5
JP1
JP2
NEUTRAL
LINEJ1
JP6
LFHF MF J3 J2J4J5J6
KEY1
SW-PB
JP7
AB
CON5
MOTOR
CON3
EXV
CON2
CON4
56
DIP
4321
ON
SW1
SW2
6
DIP
1432ON5
ROOM
CON9
OUTID2
WATER
SW3
CON6
TR1 TR2
Connecting indoor/
outdoor units communication
Line controller
Electronic
expansion valve
Coil Outlet
temperature sensor
Coil Midlet
temperature sensor
Coil Inlet
temperature sensor
Indoor return air
temperature sensor
Transformer
Fan motor 1 Fan motor 2
red blue
red
red
red
orange
yellow/green
yellow/green
yellow/green
green
green
orange
brown
orange
yellow
white
white
white
red
red
red
orange
green
green
orange
white
red
red
green
green
green
green
orange
white
white
white
white
low
middle
high
JP1
High Middle Low High Middle Low
Notes:
1. Set jumper JP:For JP1,upper two are set to OFF,
the lower two to ON,and other JPs are set to OFF.
2.Please shot water level switch WATER.
3.SW2 sets this unit address.
4.Fan motor 2 is not equipped with units under 040.
5.Field wiring
Model
brown
brown
brown
orange
yellow
30Pa
50Pa
0Pa
15Pa
Model
brown
brown
orange
yellow
50Pa
70Pa
15Pa
30Pa
Model
brown
yellow
30Pa
50Pa
0Pa
15Pa
red
red
green
green
green
green
orange
white
white
brown
Model
brown
yellow
50Pa
70Pa
15Pa
30Pa
Fan cable color 025
Fan cable color 008~020
Fan cable color 040~060
Fan cable color 030
High Middle Low
High Middle Low
M
~
EXV
~
M
LCD
OFF
ON
OFFOFF
ON
ON
ON
TR1 TR2
(220V~/50Hz)
N
OFF
OFF OFF OFF
ON
020
OFF
OFF OFFOFF
OFFOFF ON
OFF
OFF OFFOFF
OFFOFF
ON
ON
OFF
JP1
OFF
SW3.8
SW1.6SW1.4 SW1.5SW1.1 SW1.2
DIP switch SW1 settings:
SW1.3
SW3.5 SW3.6
OFF OFF
SW3.3 SW3.4
010
015
ON
SW3.1
Model
018
SW3.2
OFF
DIP switch SW3 settings:
OFF
OFF
OFF OFF
SW3.7
OFF
N
N
L
DIPON
12 438765
JP4JP3JP5
JP1
JP2
NEUTRAL
LINE
J1
JP6
LFHF MF J3 J2J4J5J6
KEY1
SW-PB
JP7
AB
CON5
MOTORCON3
EXVCON2
CON4
56
DIP
4321
ON
SW1
SW2
6
DIP
1432ON5
ROOM
CON9
OUTID2
WATER
SW3
CON6
remote controller
Connecting indoor/
outdoor units communication
Electronic
expansion valve
Tra nsformer
yellow/green
yellow/green
black
black
Coil Outlet
temperature sensor
Coil Midlet
temperature sensor
Coil Inlet
temperature sensor
Indoor return air
temperature sensor
Water level switch
Remote receiving
Indicator
Swing motor Drainage pump Fan motor
Notes:
1.Set jumper JP:For JP1,upper two are
set to OFF,the lower two to ON,and
other JPs are set to OFF.
2.SW2 sets this unit address.
3.
-----------
Field wiring
brown
yellow
LF
020
018
015
HFMFLF
MF
Mode
l
010
HF
Fan cable color
red
orange
orange
orange
brown
brown
brown
yellow
yellow
yellow
M
~~
M
EXV
~
M
black
blue
blue
blue
blue
red
red
Model MCK010/015/018/020T
-36-
Design & installation Guide For McQuay MDS Multi System
Model MCK025/030/040/050T
OFF
ON
ON
OFFOFF
ON
ON
ON
ON
TR1 TR2
(220V~/50Hz)
N
ON
OFF
OFF OFF OFF
ON
OFF
050
OFF OFF OFF
ON
040
OFF
OFF OFF OFF
ON
ONOFF
030
OFF
OFF OFF OFF
OFF
ON
025
OFF
SW3.8
SW1.6SW1.4 SW1.5SW1.1 SW1.2
DIP switch SW1 settings:
SW1.3
SW3.5 SW3.6SW3.3 SW3.4SW3.1
Model
SW3.2
DIP switch SW3 settings:
OFF
OFF
OFF OFF
SW3.7
N
N
L
DIPON
12 438765
JP4JP3JP5
JP1
JP2
NEUTRAL
LINE
J1
JP6
LFHF MF J3 J2J4J5J6
KEY1
SW-PB
JP7
AB
CON5
MOTORCON3
EXVCON2
CON4
56
DIP
4321
ON
SW1
SW2
6
DIP
1432ON5
ROOM
CON9
OUTID2
WATER
SW3
CON6
remote controller
Coil Outlet
temperature sensor
Coil Midlet
temperature sensor
Coil Inlet
temperature sensor
Indoor return air
temperature sensor
Transformer
yellow/green
yellow/green
yellow/green
brown
orange
white
black
black
blue
blue
blue
blue
JP1
Remote receiving
Indicator
Swing motor Drainage pump Fan motor
Water level switch
Notes:
1.Set jumper JP:For JP1,upper two are
set to OFF,the lower two to ON,and
other JPs are set to OFF.
2.SW2 sets this unit address.
3.
-----------
Field wiring
M
~~
M
EXV
~
M
Connecting indoor/
outdoor units communication
Electronic
expansion valve
red
red
red
ON
OFFOFF OFF
OFFON
OFF
ON
HFLF
MF
OFFOFF
0N
TR1 TR2
(220V~/50Hz)
OFF OFFOFF
0N
OFF
JP1
OFF
SW3.8
SW1.6SW1.4 SW1.5SW1.1 SW1.2
DIP switch SW1 settings:
SW1.3
SW3.5 SW3.6SW3.3 SW3.4
020
030
SW3.1
Model
SW3.2
DIP switch SW3 settings:
OFF
OFF
OFF OFF
SW3.7
OFF
N
N
L
DIPON
12 438765
JP4JP3JP5
JP1
JP2
NEUTRAL
LINE
J1
JP6
LFHF MF J3 J2J4J5J6
KEY1
SW-PB
JP7
AB
CON5
MOTORCON3
EXVCON2
CON4
56
DIP
4321
ON
SW1
SW2
6
DIP
1432ON5
ROOM
CON9 OUTID2
WATER
SW3
CON6
Connecting indoor/
outdoor units communication
remote controller
Coil Outlet
temperature sensor
Coil Midlet
temperature sensor
Coil Inlet
temperature sensor
Indoor return air
temperature sensor
Transformer
yellow/green
yellow/green
black
red
blue
blue
red
red
black
blue
yellow
white
blue
yellow
white
Remote receiving
Indicator
Swing motorFan motor
Notes:
1.Set jumper JP:For JP1,upper two are
set to OFF,the lower two to ON,and
other JPs are set to OFF.
2.SW2 sets this unit address.
3.
Please shot water level switch
WATER
.
4.
-----------
Field wiring
~
M
EXV
~
M
Electronic
expansion valve
MCM020/030T
-37-
Design & installation Guide For McQuay MDS Multi System
Model MCM050T
Model MDB050/060T
OFF
ON
OFF OFF
HFLF
MF
OFFOFF
TR1 TR2
(220V~/50Hz)
0N
OFF
JP1
OFF
SW3.8
SW1.6SW1.4 SW1.5SW1.1 SW1.2
DIP switch SW1 settings:
SW1.3
SW3.5 SW3.6SW3.3 SW3.4SW3.1 SW3.2
DIP switch SW3 settings:
OFF
OFF
OFF OFF
SW3.7
OFF
N
N
L
DIPON
12 438765
JP4JP3JP5
JP1
JP2
NEUTRAL
LINEJ1
JP6
LFHF MF J3 J2J4J5J6
KEY1
SW-PB
JP7
AB
CON5
MOTOR
CON3
EXVCON2
CON4
56
DIP
4321
ON
SW1
SW2
6
DIP
1432ON5
ROOM CON9
OUTID2
WATER
SW3
CON6
Connecting indoor/
outdoor units communication
Electronic
expansion valve
remote controller
Tra nsformer
Coil Outlet
temperature sensor
Coil Midlet
temperature sensor
Coil Inlet
temperature sensor
Indoor return air
temperature sensor
Fan motor 1 Fan motor 2 Fan motor 3
yellow/green
yellow/green
yellow/green
black
black
black
black
b
lu
e
bluered
red
blue
brown
orange
yellow
brown
orange
yellow
b
lu
e
brown
orange
yellow
Remote receiving
Indicator
Notes:
1.Set jumper JP:For JP1,upper two are
set to OFF,the lower two to ON,and
other JPs are set to OFF.
2.SW2 sets this unit address.
3.
Please shot water level switch
WATER
.
4.
-----------
Field wiring
~
M
~
M
EXV
~
M
OFF
ON
ON
OFF
k1
k2
k3
k1k2k3
HF
MF
LF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF OFF
OFF OFF ON
050
ON
060
JP1
SW3.8
SW1.6SW1.4 SW1.5SW1.1 SW1.2
DIP switch SW1 settings:
SW1.3
SW3.5 SW3.6SW3.3 SW3.4SW3.1 SW3.2
DIP switch SW3 settings:
OFF
OFF
OFF
OFF OFF
SW3.7
N
N
L
(220V~/50Hz)
DIPON
12 438765
JP4JP3JP5
JP1
JP2
NEUTRAL
LINEJ1
JP6
LFHF MF J3 J2J4J5J6
KEY1
SW-PB
JP7
AB
CON5
MOTORCON3
EXVCON2
CON4
56
DIP
4321
ON
SW1
SW2
6
DIP
1432ON5
ROOM
CON9
OUTID2
WATER
SW3
CON6
TR1 TR2
Connecting indoor/
outdoor units communication
Electronic
expansion valve
Transformer
remote controller
Line controller
Coil Outlet
temperature sensor
Coil Midlet
temperature sensor
Coil Inlet
temperature sensor
Indoor return air
temperature sensor
yellow/green
yellow/green
white
white
low
middle
high
Model
Fan motor
High
Middle
Low
Notes:
1.Set jumper JP:For JP1,upper two are
set to OFF,the lower two to ON,and
other JPs are set to OFF.
2.Please shot water level switch
WATER
.
3.SW2 sets this unit address.
4.
-----------
Field wiring
060
050
red
blue
brown
orange
yellow
brown
orange
yellow
Model
blue
bluered
brownblack
black
EXV
~
M
LCD
-38-
Design & installation Guide For McQuay MDS Multi System
2.6.2 Wiring Diagram of Outdoor Units
Model MDS030A
McQuay
BGND
A
AI-IN
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
LIVE
NEUTRAL
3L21L1 5L3
6T34T2
2T1
KM
C
S
CM
R
JP2JP1
J2
J1
RY7RY6RY4 RY5RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP
CN1
DLT
HP
LP
C2
~
M
13
N
1087
2
14
3
EXV
12
11
N
5
L
N
220V~/50Hz
FU
KM
PWMV
JP1
JP2
OFF OFF OFF
OFF OFF
OFF
ON
ON
J1.1 J1.2 J1.3 J1.4 J1.5 J1.6 J1.7
C1-3
KM
EXV
PWMV
FU
OFFOFF
HP
LP
PTC
Description of components and parts:
Description
Compressor start-up unit
Fuse
Solenoid valve
Low pressure switch
Contactor
Capacitor
High pressure switch
Symbol
Description
Symbol
Electric expansion valve
Jumper settingsǖ
DIP switch J1 settings:
DIP switch J2 setting:
J2.6
Trans-
former
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil middle
temperature sensor(TH5)
C1PTC
Shaft
heater
Compressor
blue red
white
black
white
Fan 1
Connecting indoor
unit communication
blue
brown
red
orange
Return air temperature sensor(TH3)
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
McQuay
B GND
A
AI-IN
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
NEUTRAL
LIVE
RC
C1
PTC
3L21L1 5L3
6T34T2
2T1
KM
C
S
CM
R
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP
CN1
DLT
HP
LP
C2
~
M
Connecting indoor
unit communication
Trans-
former
RC
13
J1.7 J1.5
J1.4J1.3J1.2J1.1
J1.6
N
PTC
1087
2
14
3
4
LP
HP
ONOFFON
EXV
12
11
N
5
L
N
220V~/50Hz
FU
KM
PWMV
4WV
OFFOFFOFF OFF
FU
PWMV
EXV 4WV
KM
C1-2
Shaft
heater
Compressor
blue re d
white
black
white
Fan 1
JP1
JP2
OFF OFFOFF
Description of components and parts:
Symbol DescriptionSymbol
Jumper settingsǖ
DIP switch J1 settings:
DIP switch J2 setting:
J2.6
Description
Compressor start-up unit
Four-way valve
Contactor
Capacitor
High pressure switch
Fuse
Electric expansion valve
Solenoid valve
Low pressure switch
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil inlet temperature sensor(TH4)
Coil middle temperature sensor(TH5)
Coil outlet
temperature sensor(TH6)
blue
brown
red
orange
Return air temperature sensor
(TH3)
Surge suppressor
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
Model MDS030AR
-39-
Design & installation Guide For McQuay MDS Multi System
Model MDS040AR
Model MDS040A
McQuay
BGND
A
AI-IN
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
NEUTRAL
LIVE
C1
PTC
3L21L1 5L3
6T34T2
2T1
KM
C
S
CM
R
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP
DLT
HP
LP
C3
C2
~
M
~
M
Trans-
former
Connecting indoor
unit communication
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil middle
temperature sensor(TH5)
N
1087
2
14
13
3
12
11
N
5
L
N
220V~/50Hz
FU
KM
PWMV
J1.7J1.5
J1.4J1.3J1.2J1.1
J1.6
PTC
LP
HP
ON
OFF
OFF OFF OFFOFF
OFF
OFF
FU
PWMV
KM
C1-3
JP1
JP2
OFFOFF
Description of components and parts:
Symbol DescriptionSymbol
Jumper settingsǖ
DIP switch J1 settings:
DIP switch J2 setting:
J2.6
Description
Compressor start-up unit
Contactor
Capacitor
High pressure switch
Fuse
Solenoid valve
Low pressure switch
Compressor
blue blue
red
red red
white
Fan 1
Fan 2
blue
brown
yellow
orange
blue
brown
yellow
orange
Return air temperature sensor
(TH3)
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
McQuay
B GND
A
AI-IN
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
NEUTRAL
LIVE
RC
C1
PTC
213L2
1L1
5L3
6T3 224T2
2T1
KM
C
S
CM
R
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP
CN1
DLT
HP
LP
C3
C2
~
M
~
M
JP1
JP2
OFF OFFOFF
Jumper settingsǖ
J1.7 J1.5
J1.4J1.3J1.2J1.1
J1.6
OFFOFF OFF OFFOFFOFF OFF
DIP switch J1 settings:
DIP switch J2 setting:
J2.6
RC
PTC
LP
HP
FU
PWMV
EXV 4WV
KM
C1-2
Description of components and parts:
Symbol DescriptionSymbol Description
Compressor start-up unit
Four-way valve
Contactor
Capacitor
High pressure switch
Fuse
Electric expansion valve
Solenoid valve
Low pressure switch
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil inlet temperature sensor(TH4)
Coil middle temperature sensor(TH5)
Coil outlet
temperature sensor(TH6)
Connecting indoor
unit communication
Trans-
former
Return air temperature sensor
(TH3)
Surge suppressor
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
N
1087
2
1413
3
4
EXV
12
11
N
5
L
N
220V~/50Hz
FU
KM
PWMV 4WV
Shaft
heater
Compressor
white
blue red
red
red
Fan 1 Fan 2
blue
brown
yellow
orange
blue
brown
yellow
orange
blue
brown
yellow
orange
-40-
Design & installation Guide For McQuay MDS Multi System
Model MDS050A
Model MDS050AR(220V~/50Hz)
BGND
A
AI-IN
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
NEUTRAL
LIVE
McQuay
3L2
KM
1L1
5L3
4T2
2T1
6T3
PTC
C1
R
C
CM
S
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP.
DLT
HP
LP
C3
C2
~
M
~
M
J1.7J1.5
J1.4J1.3J1.2J1.1
J1.6
PTC
LP
HP
ON
OFF
OFF OFFOFF
OFF
OFF
FU
PWMV
KM
C1-3
JP1
JP2
OFFOFF
Description of components and parts:
Symbol DescriptionSymbol
Jumper settingsǖ
DIP switch J1 settings:
DIP switch J2 setting:
J2.6
Description
Compressor start-up unit
Contactor
Capacitor
High pressure switch
Fuse
Solenoid valve
Low pressure switch
Connecting indoor
unit communication
Compressor
blue bluered
white
Trans-
former
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil middle
temperature sensor(TH5)
N
10
87
2
1413
3
ON
12
11
N
5
L
N
220V~/50Hz
FU
KM
PWMV
red red
Fan 1
Fan 2
blue
brown
yellow
orange
blue
brown
yellow
orange
Return air temperature sensor(TH3)
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
McQuay
B GND
A
AI-IN
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
NEUTRAL
LIVE
RC
C1
PTC
213L2
1L1
5L3
6T3 224T2
2T1
KM
C
S
CM
R
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP.
CN1
DLT
HP
LP
C3
C2
~
M
~
M
Trans-
former
Connecting indoor
unit communication
N
1087
2
1413
3
4
EXV
12
11
N
5
L
N
FU
KM
PWMV 4WV
JP1
JP2
OFF OFFOFF
Jumper settingsǖ
J1.7 J1.5
J1.4J1.3J1.2J1.1
J1.6
OFFOFF OFF ONOFFOFF OFF
DIP switch J1 settings:
DIP switch J2 setting:
J2.6
RC
PTC
LP
HP
FU
PWMV
EXV 4WV
KM
C1-2
Description of components and parts:
Symbol DescriptionSymbol Description
Compressor start-up unit
Four-way valve
Contactor
Capacitor
High pressure switch
Fuse
Electric expansion valve
Solenoid valve
Low pressure switch
Shaft
heater
Compressor
white
blue red
red
red
Fan 1 Fan 2
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil inlet temperature sensor(TH4)
Coil middle temperature sensor(TH5)
Coil outlet
temperature sensor(TH6)
blue
brown
yellow
orange
blue
brown
yellow
orange
Return air temperature sensor(TH3)
Surge suppressor
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
-41-
Design & installation Guide For McQuay MDS Multi System
Model MDS050AR(380V/3N~/50Hz)
Model MDS060A
BGND
A
AI-IN
McQuay
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
NEUTRAL
LIVE
RC
C1
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP.
CN1
DLT
HP
LP
C2
~
M
~
M
~
M
Connecting indoor
unit communication
Reverse phase-loss protector
Overload protector
Trans-
former
RC
OFF
ON
DIP switch J2 setting:
J2.6
OFF
J1.7J1.5
J1.4J1.3J1.2J1.1
J1.6
18
T2
T3T1
OL
23
22
21
20
1
2
L1
LPHP
OFF
71
81
EXV
16
15
L
12
N
3
DB3A
S
R
T
N
FU
81
N
KM
PWMV 4WV
71
R
DB3A
S
T
OFFOFF
DIP switch J1 settings:
OFF
OFF
OFFOFF
JP2JP1
12.9A
OL
KM
OL
FU
PWMV
EXV 4WV
DB3A
KM
C1-2 OL
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil inlet temperature sensor(TH4)
Coil middle temperature sensor(TH5)
Coil outlet
temperature sensor(TH6)
Overload setting&Jumper settingsǖ
Four-way valve
Contactor
Capacitor
High pressure switch Low pressure switch
Description of components and parts:
Symbol DescriptionSymbol Description
Shaft
heater
Digital
compressor
red
red
Fan 1 Fan 2
Fuse
Electric expansion valve
Solenoid valve
Return air temperature sensor(TH3)
Surge suppressor
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
yellow
green
red
yellow
green
red
blue
brown
yellow
orange
blue
brown
yellow
orange
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
McQuay
B GND
A
AI-IN
NEUTRAL
LIVE
C1
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP.
DLT
HP
LP
C2
~
M
~
M
~
M
Digital
compressor
Fan 1 Fan 2
Trans-
former
white
black
white
black
Connecting indoor
unit communication
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil middle
temperature sensor(TH5)
red
blue
brown
orange
red
blue
brown
orange
yellow
green
red
yellow
green
red
DIP switch J2 setting:
J2.6
ON
J1.7J1.5
J1.4J1.3J1.2J1.1
J1.6
17
18
19
T2
T3T1
OL
23
22
21
20
1
L1
LP
HP
K1-3
K1
K2
K3
K3K2K1
OFFON
OFF
71
81
16
15
L
12
N
8
7
5
3
DB3A
SRT
N
380V/3N~/50Hz
FU
81
N
KM
PWMV
71 R
DB3A
S
T
OFFOFF
DIP switch J1 settings:
OFF
OFF
JP2JP1
OFF OFF
14.0A
OL
Overload setting&Jumper settings:
KM
OL
FU
PWMV
DB3A
KM
C1-2 OL
Description of components and parts:
Symbol DescriptionSymbol Description
Reverse phase-loss protector
Contactor
Capacitor
High pressure switch
Overload protector
Low pressure switchRelay
Fuse
Return air temperature sensor(TH3)
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
Solenoid valve
-42-
Design & installation Guide For McQuay MDS Multi System
Model MDS060AR(220V~/50Hz)
Model MDS060AR(380V/3N~/50Hz)
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
McQuay
B GND
A
AI-IN
NEUTRAL
LIVE
RC
C1
PTC
213L21L1 5L3
6T3 224T22T1
KM
C
S
CM
R
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP.
CN1
DLT
HP
LP
C3
C2
~
M
~
M
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil inlet temperature sensor(TH4)
Coil middle temperature sensor(TH5)
Coil outlet
temperature sensor(TH6)
Connecting indoor
unit communication
JP1
JP2
OFFOFF
Jumper settingsǖ
J1.7 J1.5
J1.4J1.3J1.2J1.1
J1.6
ONOFF OFF OFFOFFOFF OFF
DIP switch J1 settings:
OFF
DIP switch J2 setting:
J2.6
RC
PTC
LP
HP
FU
PWMV
EXV 4WV
KM
C1-2
Description of components and parts:
Symbol DescriptionSymbol Description
Compressor start-up unit
Four-way valve
Contactor
Capacitor
High pressure switch
Relay
Fuse
Electric expansion valve
Solenoid valve
Low pressure switch
K1-3
Trans-
former
15
13
K3
19
K1
17
K2
18
K3K2K1
N
1087
2
1614
3
4
EXV
12
11
N
5
L
N
FU
KM
PWMV 4WV
Shaft
heater
Compressor
white
white
blue
red
Fan 1 Fan 2
black
white
black
red
blue
brown
orange
red
blue
brown
orange
Return air temperature sensor(TH3)
Surge suppressor
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
HP
LP
OV-COMP1
OV-COMP2
OV-COMP3
NEUTRAL
B GND
A
AI-IN
NEUTRAL
LIVE
McQuay
RC
C1
JP2JP1
J2
J1
RY7
RY6RY4 RY5
RY3RY1 RY2
MidLet
OutLet
RTN
C-BTM
LOW-FAN
MID-FAN
HI-FAN
DIG COMP
FIXED COMP
PWMV
4WV
TRAN-H
TRAN-L
InLet
OD TEMP.
CN1
DLT
HP
LP
C2
~
M
~
M
~
M
Shaft
heater
Trans-
former
Connecting indoor
unit communication
Ambient temperature sensor(TH2)
Air discharge temperature sensor of the digital compressor(TH1)
Coil inlet temperature sensor(TH4)
Coil middle temperature sensor(TH5)
Coil outlet
temperature sensor(TH6)
17
18
19
T2
T3T1
OL
23
22
21
20
1
2
L1
K1
K2
K3
K3K2K1
71
81
EXV
16
15
L
12
N
8
7
5
3
DB3A
SRT
N
FU
81
N
KM
PWMV
4WV
71 R
DB3A
S
T
KM
OL
EXV
4WV Four-way valve
RC
DIP switch J2 setting:
J2.6
J1.7J1.5
J1.4J1.3J1.2J1.1
J1.6
JP2JP1
LP
HP
K1-3
OFFONOFFOFFOFF
DIP switch J1 settings:
OFF OFF
OFF OFF OFF
14.0A
OL
Overload setting&Jumper settings:
FU
PWMV
DB3A
KM
C1-2 OL
Description of components and parts:
Symbol DescriptionSymbol Description
Reverse phase-loss protector
Contactor
Capacitor
High pressure switch
Overload protector
Low pressure switchRelay
Digital
compressor
Fan 1 Fan 2
white
black
white
black
Fuse
Electric expansion valve
Solenoid valve
Return air temperature sensor(TH3)
Surge suppressor
Notes:
1:
-----------
Field wiring
2:
--------------
Factory wiring
3: J2.1~2.5 sets the internetworking control address
4: If the unit connected at the end of the bus,JP1,JP2 is on.
yellow
green
red
yellow
green
red
red
blue
brown
orange
red
blue
brown
orange
-43-
Design & installation Guide For McQuay MDS Multi System
Model MDS080/100/120B
Model MDS080/100/120BR
HI-U
3
21
LPT
LOW-U
AinApc
Bpc
Bin
S2 S3S1
MDS-M
MDS-P
~
M
~
M
M
~
TR
FU
DB3A
PMW
OL
HP
LPT
KM
EXV4
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector
Fuse
Contactor
High-pressure switch
Low -pressure sensor
Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
S3.4
OFF
OFF
S3.3
OL3 OL4
S3.1
OFF
S2.2
OFF ON
S2.3 S3.2
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFFONON
ON
ON
ON
OL1
14.0A
S1.1
OFF
14.0A
OFF
OFF
S1.2
OL2
14.0A
14.0A
14.0A
Overload protection settings :
DIP switch settings :
Model
Model
RED
BLACK
WHITE
Connecting the indoor unit
Connecting central control system
30
31
32
33
MDS080B
MDS100B
MDS120B
MDS120B
MDS100B
MDS080B
17
DB3A
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
KM3
KM4
TH1TH2
EXV4
EXV1
EXV4
L
T71
FU
TH8TH10 TH9TH11TH12TH6HI-1 TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
12
13
OL1
OL2
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
1
SV1
KM4 KM3
KM1
PMW
KM2
3
HP
N
L
OL4
J1
16
15
OL3
HP
J18
LP
R
N
24 25 26
KM3
OL3
2321 22
OL4
KM4
T3
T1
T2
L1
S
81
TH4
1.8A3.3A
0.67A
1.9A
0.67A
11.6A 1.9A
N
TS
380V/3N~/50Hz
R
KM1
OL1
T3
T2
T1
OL2
KM2
Constant-speed compressor Fan motorDigital compressor
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLACK
WHITE
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Coil inlet temperature sensor TH2
Air discharge temperature
sensor of the digital compressor TH1
Ambient temperature sensor TH8
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.
BLACK
WHITE
BROWN
3
21
LPT
LOW-U
AinApcBpc Bin
S2 S3S1
MDS-M
MDS-P
~
M
~
M
M
~
Model
Model
Connecting the indoor unit
Connecting central control system
30
31
32
33
OFF ON
OFF
MDS080BR
MDS100BR
MDS120BR
OFFONOFF ON OFF OFFOFFOFF
OFFON OFFOFFOFF OFF
MDS120BR
MDS100BR
MDS080BR
1.8A
3.3A14.0A 14.0A
14.0A 14.0A
0.67A
1.9A
17
TR
DB3A
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
7
4WV
KM3
KM4
HI-U
TH1
TH2
EXV4EXV1
EXV4
EXV1
L
T
71
FU
TH8TH10
TH9TH11
TH12
TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
12
13
OL1
OL2
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
1
SV1
KM4
KM3
KM1
PMW
KM2
3
HP
N
L
OL4
J1
16
15
OL3
HP
J18
LP
R
N
24 25 26
KM3
OL3
2321 22
19
OL4
KM4
T3
T1
T2
L1
S
81
TH4
S3.4
OFF
S3.2
OFF
0.67A
S2.3
ON OFF
S3.1 S3.3
OL3
14.0A
OL1
11.6A
S1.1
OFF
OL2
S1.2
OFF
OL4
1.9A
OFF
S2.2
N
TS
380V/3N~/50Hz
R
18
KM1
OL1
T3
T2
FU
EXV14WV
DB3A
T1
PMW
OL
HP
LPT
KM EXV4
OL2
KM2
Shaft heater
Shaft heater
Constant-speed compressor Digital compressor Fan motor
Symbol
Description
Symbol
Description
Phase-loss/reverse protector
System electronic expansion valve 1
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
Overload protection settings :
DIP switch settings :
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Coil inlet temperature sensor TH2
Coil inlet temperature sensor TH1
Air discharge temperature sensor of the digital compressor TH1
BLACK
WHITE
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLACK
WHITE
BROWN
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.
RED
BLACK
WHITE
-44-
Design & installation Guide For McQuay MDS Multi System
Model MDS150B
Model MDS150BR
23
HPT
3121
LPT
HI-U
LOW-U
AinApcBpc Bin
S2 S3S1
MDS-M
~
M
MDS-P
~
M
~
M
M
~
Air discharge temperature
sensor of the digital compressor TH1
RED
BLACK
WHITE
RED
BLACK
WHITE
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Connecting the indoor unit
Connecting central control system
30
31
32
33
8
KM2
12
OL2
T3
OL3
KM3
T2
T1
17
DB3A
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
KM4 KM5
TH1TH2
EXV4
EXV1
EXV4
L
T
71
FU
TH8TH10 TH9TH11TH12TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL3
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
1
SV1
KM5 KM4 KM1
PMW
KM3
3
HP
N
L
OL5
J1
16
15
OL4
HP
J18
LP
R
N
24 25 26
KM4
OL4
2321 22
OL5
KM5
T3
T1
T2
L1
S
81
TH4
N
TS
380V/3N~/50Hz
R
KM1
OL1
T3
T2
T1
OL2
KM2
HPT
TR
FUDB3A
PMW
OL
HP
LPT
KM EXV4
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector Fuse
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor
Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
3.3A 1.8A
OL4 OL5
14.0
OL3OL2
14.014.0
OL1
Overload protection settings :
ONON
S3.4
OFF
S3.2S2.3
ONON OFF
S3.1 S3.3S1.1
OFF
S1.2
OFF
S2.2
DIP switch settings :
Constant-speed
compressor 1
Constant-speed
compressor 2
Digital compressor Fan motor
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
BLACK
WHITE
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.
~
M
Bin AinApcBpc
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
3
HPT
21231
LPT
33
32
31
7
30
HPT
8
KM2
12
OL2
20
T3
OL3
KM3
T2
T1
17
TR
DB3A
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
4WV
KM4 KM5
HI-U
TH1
TH2
LOW-U
EXV4EXV1
EXV4
EXV1
L
T
71
FU
TH8TH10
TH9TH11
TH12
TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL3
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
1
SV1
KM5
KM4
KM1
PMW
KM3
3
HP
N
L
OL5
J1
16
15
OL4HP
J18
LP
R
N
24 25 26
KM4
OL4
2321 22
19
OL5
KM5
T3
T1
T2
L1
S81
TH4
14.0
OL3
1.8A
OL4
14.0
OL1
14.0
OL2 OL5
3.3A
S3.4
ON
S3.2
OFF
S2.3
ON OFF
S3.1 S3.3
ON
S1.1
OFF
S1.2
OFF OFF
S2.2
N
T
S
380V/3N~/50Hz
R
18
KM1
OL1
T3
T2
FU
EXV14WV
DB3A
T1
PMW
OL
HP
LPT
KM EXV4
OL2
KM2
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Air discharge temperature sensor of the digital compressor TH1
BLACK
WHITE
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
Connecting the indoor unit
Connecting central control system
Shaft heater
Shaft heater
Shaft heater
Constant-speed
compressor 1
Constant-speed
compressor 2
Digital compressor
Fan motor
Symbol
Description
Symbol Description
Phase-loss/reverse protector
System electronic expansion valve 1
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
Overload protection settings :
DIP switch settings :
Description of components and parts :
Coil inlet temperature sensor TH2
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.
RED
BLACK
WHITE
RED
BLACK
WHITE
-45-
Design & installation Guide For McQuay MDS Multi System
Model MDS180B
Model MDS180BR
3
1
21
LPT3HPT
2
LOW-U
HI-U
AinApc BinBpc
MDS-E
~
M
M
~
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
RED
BLACK
WHITE
RED
BLACK
WHITE
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Air discharge temperature
sensor of the digital compressor TH1
45
46
47
48
EXV2
EXV3
KM6
OL6
KM4
OL4
27262524
232221
19
OL7OL6
18
12
OL2
FANL3
KM6
KM7
KM7KM6
5
KM2
2
4WV2
KM4
20
KM5
KM5KM4
L
SV2
SV1
FANH3
FANL2
FANH2
FANL1
FANH1
4342
KM7
OL7
41403938
KM3
OL3
T3
T2
T1
17
DB3A
FIX3-OL
DIG
FIX1
FIX2
EXV4EXV1
EXV4
L
T
71
FU
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL3
FIX2-OL
FIX1-OL
FIX3
4WV1
4WV2
PMW
10
7
1
KM1
PMW
KM3
HP
N
L
OL5
J1
16
15
OL4HP
LP
R
N
35 36 373432 33
OL5
KM5
T3
T1
T2
L1
S
81
N
TS
380V/3N~/50Hz
R
KM1
OL1
T3
T2
T1
OL2
KM2
1.9A 0.67A1.9A
OL7
0.67A
OL6OL4 OL5
14.0
OL3OL2
14.014.0
OL1
OFFON
HPT
TR
S3.4
OFF
S3.2S2.3
ONON OFF
S3.1 S3.3S1.1
OFF
S1.2
OFF
S2.2
FU
4WV
DB3A
PMW
OL
HP
LPT
KM
EXV4
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor
Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
Overload protection settings :
DIP switch settings :
Constant-speed
compressor 1
Constant-speed
compressor 2
Digital compressor Fan motor 1 Fan motor 2
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLACK
WHITE
BROWN
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
YELLOW
BLUE
RED
BLACK
WHITE
Connecting the indoor unit
Connecting central control system
TH7 TH5
TH1
TH2
TH8TH10
TH9TH11
TH12
TH6
HI-1
TH3
LOW-I
TH4
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.
21
LPT
3213
HPT
LOW-U HI-U
Bin
Apc
Ain
Bpc
MDS-E
~
M
M
~
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
48
47
46
45
1.9A 0.67A1.9A
OL7
0.67A
OL6OL4 OL5
14.0
OL3OL2
14.014.0
OL1
OFFON
EXV2
EXV2
HPT
EXV2EXV3
KM6
OL6
KM4
OL4
27262524
232221
19
OL7OL6
18
12
OL2
FANL3
KM6
KM7
KM7KM6
5
KM2
2
4WV2
KM4
20
KM5
KM5KM4
L
SV2
SV1
FANH3
FANL2
FANH2
FANL1
FANH1
4342
KM7
OL7
41403938
30
KM3
OL3
T3
T2
T1
17
TR
DB3A
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
3
4WV1
TH1
TH2
EXV4EXV1
EXV4
EXV1
L
T
71
FU
TH8TH10
TH9TH11
TH12
TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL3
FIX2-OL
FIX1-OL
LOW-I
FIX3
4WV1
4WV2
PMW
10
7
1
KM1
PMW
KM3
HP
N
L
OL5
J1
16
15
OL4HP
LP
R
N
35 36 373432 33
29
OL5
KM5
T3T1
T2
L1
S
81
TH4
S3.4
OFF
S3.2S2.3
ON OFF
S3.1 S3.3S1.1
OFF
S1.2
OFF OFF
S2.2
N
TS
380V/3N~/50Hz
R
28
KM1
OL1
T3
T2
FU
EXV14WV
DB3A
T1
PMW
OL
HP
LPT
KM
EXV4
OL2
KM2
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Coil inlet temperature sensor TH2
Coil inlet temperature sensor TH1
Air discharge temperature sensor of the digital compressor TH1
RED
BLACK
WHITE
BLACK
WHITE
BLACK
WHITE
BROWN
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
RED
BLACK
WHITE
Connecting the indoor unit
Connecting central control system
Shaft heater Shaft heater
Shaft heater
Constant-speed
compressor 1
Constant-speed
compressor 2
Digital compressor Fan motor 1 Fan motor 2
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector
System electronic expansion valve 1
System electronic expansion valve 2
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor
Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
Overload protection settings :
DIP switch settings :
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.
-46-
Design & installation Guide For McQuay MDS Multi System
Model MDS200/220/240B
Model MDS200/220/240BR
3
1
21
LPT3HPT
2
LOW-U
HI-U
MDS-E
~
M
~
M
M
~
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
Bin
Apc
Ain
Bpc
Connecting the indoor unit
Connecting central control system
0.67A
OL8
1.9A0.67A
OL7OL6
1.8A
S3.4
ON
3.3A1.8A
OFF
S3.3
1.9A 0.67A0.67A
1.9A
OL5
14.0A
OL3 OL4
14.0A
3.3A
S3.1
OFF
14.0A
S2.2
OFF ON
S2.3
14.0A
14.0A 1.9A14.0A
S3.2
ON
ONONON
OFFOFF
OFF
OFF
OFFONON
ON
ON
ON
ON
ON
14.0A
OL1
MDS200B
MDS220B
14.0A
S1.1
OFF
MDS240B
MDS200B
14.0A
OFF
OFF
MDS220B
MDS240B
S1.2
OL2
14.0A
14.0A
14.0A
HPT
TR
FU
4WV
DB3A
PMW
OL
HP
LPT
KM
EXV4
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor
Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
Overload protection settings :
DIP switch settings :
Model
Model
RED
BLACK
WHITE
RED
BLACK
WHITE
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Air discharge temperature
sensor of the digital compressor TH1
Constant-speed
compressor 1
Constant-speed
compressor 2
Constant-speed
compressor 3
Digital compressor Fan motor 1 Fan motor 2
BLACK
WHITE
BROWN
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
45
46
47
48
EXV3 EXV2
2
4WV
KM7
OL7
KM5
OL5
27262524
232221
19
OL8
OL7
18
12
OL2
OL3
11
FANL3
KM7
KM8
KM8KM7
4
KM35KM2
KM5
20
KM6
KM6KM5
L
SV2
SV1
FANH3
FANL2
FANH2
FANL1
FANH1
4342
KM8
OL8
41403938
T2
T3
T1
KM3
OL3
T3
T2
T1
17
DB3A
FIX3-OL
DIG
FIX1
FIX2
EXV4
EXV1
EXV4
L
T
71
FU
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL4
FIX2-OL
FIX1-OL
FIX3
4WV1
4WV2
PMW
10
7
1
KM1
PMW
KM4
HP
N
L
OL6
J1
16
15
OL5
HP
LP
R
N
35 36 37
KM4
OL4
3432 33
OL6
KM6
T3
T1
T2
L1
S
81
N
T
S
380V/3N~/50Hz
R
KM1
OL1
T3T2T1
OL2
KM2
BLACK
WHITE
TH7 TH5
TH1
TH2TH8TH10
TH9TH11
TH12
TH6HI-1 TH3
LOW-I
TH4
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.
AinApc
Bin
Bpc
EXV2
EXV3 EXV2
MDS-E
~
M
~
M
M
~
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
2
HPT
3
3
1
LPT
12
HI-U
LOW-U
45
46
47
48
OFF
OFF
OFF
0.67A
OL8
1.9A0.67A
OL7OL6
1.8A
S3.4
ON
3.3A1.8A
OFF
S3.3
1.9A 0.67A0.67A
1.9A
OL5
14.0A
OL3 OL4
14.0A
3.3A
S3.1
OFF
14.0A
S2.2
OFF ON
S2.3
14.0A
14.0A 1.9A14.0A
S3.2
ON
ONONON
OFFOFF
OFF
OFF
OFFONONONON
14.0A
OL1
MDS200BR
MDS220BR
14.0A
S1.1
OFF
MDS240BR
MDS200BR
14.0A
OFF
OFF
MDS220BR
MDS240BR
S1.2
OL2
14.0A
14.0A
14.0A
KM7
OL7
KM5
OL5
27
262524
232221
19
OL8OL7
18
12
OL2
OL3
11
FANL3
KM7
KM8
KM8KM7
4
KM35KM2
2
4WV2
KM5
20
KM6
KM6KM5
L
SV2
SV1
FANH3
FANL2
FANH2
FANL1
FANH1
43
42
KM8
OL8
41
4039
38
31
T2
T3T1
30
KM3
OL3
T3
T2
T1
17
DB3A
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
3
4WV1
TH1
TH2
EXV4EXV1
EXV4
EXV1
L
T
71
FU
TH8TH10
TH9TH11
TH12
TH6HI-1 TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL4
FIX2-OL
FIX1-OL
LOW-I
FIX3
4WV1
4WV2
PMW
10
7
1
KM1
PMW
KM4
HP
N
L
OL6
J1
16
15
OL5HP
LP
R
N
35
36
37
KM4
OL4
3432 33
29
OL6
KM6
T3
T1
T2
L1
S81
TH4
N
TS
380V/3N~/50Hz
R
28
KM1
OL1
T3
T2
T1
OL2
KM2
EXV2
HPT
TR
FU
EXV14WV
DB3A
PMW
OL
HP
LPT
KM
EXV4
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector
System electronic expansion valve 1
System electronic expansion valve 2
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor
Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
Overload protection settings :
DIP switch settings :
Model
Model
Constant-speed
compressor 1
Constant-speed
compressor 2
Constant-speed
compressor 3
Digital compressor Fan motor 1 Fan motor 2
BLACK
WHITE
BLACK
WHITE
BROWN
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
Connecting the indoor unit
Connecting central control system
RED
BLACK
WHITE
RED
BLACK
WHITE
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Coil inlet temperature sensor TH2
Coil inlet temperature sensor TH1
Air discharge temperature sensor of the digital compressor TH1
Shaft
heater
Shaft
heater
Shaft
heater
Shaft
heater
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.
-47-
Design & installation Guide For McQuay MDS Multi System
Model MDS260BR(Master Unit)
2
HPT
3
3
1
LPT
12
HI-ULOW-U
AinApcBpc
Bin
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
HPT TR
OL3
1.8A
OL4
14.0A
OL1
14.0A
OL2
3.3A
S3.4
ON
S3.2
OFF OFF
S2.3
ON OFF
S3.1 S3.3
ON
S1.1
OFF
S1.2
OFF OFF
S2.2S2.1
FU
EXV14WV
DB3A
PMW
OL
HP
LPT
KM EXV4
Symbol Description Symbol Description
Phase-loss/reverse protector
System electronic expansion valve 1
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor Transformer
Overload protector
Solenoid valve
Over cooling electronic expansion valve 4
Overload protection settings :
DIP switch settings :
Description of components and parts :
Constant-speed compressor
Digital compressor Fan motor
Connecting the indoor unit
Connecting central control system
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
RED
BLACK
WHITE
RED
BLACK
WHITE
Shaft heater Shaft heater
N
TSR
DB3A
L
T
71
FU
R
N
24 25 26
KM3
OL3
2321 22
19
OL4
KM4
S
81
18
KM1
OL1
T3
T2
T1
T3T2T1
OL2
KM2
30
31
32
33
17
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
7
4WV
KM3 KM4
TH1TH2
EXV4EXV1
EXV4
EXV1
TH8TH10 TH9TH11TH12TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
12
13
OL1
OL2
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
1
SV1
KM4 KM3 KM1
PMW
KM2
3
HP
N
L
OL4
J1
16
15
OL3HP
J18
LP
L1
TH4
BLACK
WHITE
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Coil inlet temperature sensor TH2
Air discharge temperature sensor of the digital compressor TH1
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.
Model MDS280/300BR(Master Unit)
2
HPT
3
3
1
LPT
12
HI-U
LOW-U
AinBinApcBpc
~
M
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
RED
BLACK
WHITE
RED
BLACK
WHITE
Connecting the indoor unit
Connecting central control system
33
32
31
30
8
KM2
12
OL2
20
T3
OL3
KM3
T2
T1
17
DB3A
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
7
4WV
KM4
KM5
TH1TH2
EXV4
EXV1
EXV4
EXV1
L
T
71
FU
TH8TH10 TH9TH11TH12TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL3
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
1
SV1
KM5 KM4 KM1
PMW
KM3
3
HP
N
L
OL5
J1
16
15
OL4HP
J18
LP
R
N
24 25 26
KM4
OL4
2321 22
19
OL5
KM5
T3T1
T2
L1
S
81
TH4
N
TS
380V/3N~/50Hz
R
18
KM1
OL1
T3
T2
T1
OL2
KM2
HPT
TR
FU
EXV1
4WV
DB3A
PMW
OL
HP
LPT
KM
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector
System electronic expansion valve
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor
Transformer
Overload protector
Solenoid valve
3.3A 1.8A
OL4 OL5
14.0
OL3OL2
14.014.0
OL1
Overload protection settings :
EXV4
Over cooling electronic expansion valve 4
MDS320BR
MDS300BR
MDS280BR
Model
ON
ON
OFF
ON
ONON OFFOFFOFF
ON OFFOFFOFF
S3.4
OFF
S3.2
OFF
S2.2
ON
ON
ON
ON
ON
ON
ON
S2.3
S3.1
S3.3S1.1
OFF
S1.2
OFF
OFF
OFF
OFF
S2.1
DIP switch settings :
Constant-speed
compressor 1
Constant-speed
compressor 2
Digital compressor Fan motor
Shaft heater
Shaft heater
Shaft heater
BLACK
WHITE
Air suction temperature sensor TH12
Ambient temperature sensor TH8
Air discharge temperature
sensor of the digital compressor TH1
Coil inlet temperature sensor TH2
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
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.
-48-
Design & installation Guide For McQuay MDS Multi System
Model MDS260/280/300BR(Slave Unit)
2
HPT
3
3
1
LPT
12
HI-U
LOW-U
AinBinApcBpc
~
M
MDS-M
MDS-P
S3S1 S2
~
M
~
M
M
~
RED
BLACK
WHITE
RED
BLACK
WHITE
Connecting the indoor unit
Connecting the master unit
33
32
MDS320BR
MDS300BR
MDS280BR
MDS260BR
8
KM2
12
OL2
20
T3
OL3
KM3
T2
T1
17
DB3A
5
FIX3-OL
DIG
FIX1
FIX2
TH7 TH5
7
4WV
KM4
KM5
TH1TH2
EXV4EXV1
EXV4
EXV1
L
T
71
FU
TH8TH10TH9TH11TH12TH6
HI-1
TH3
V1+
TR
V2-
V2+
V1-
DIG-OL
13
14
OL1
OL3
FIX2-OL
FIX1-OL
LOW-I
4WV
FANL
FANH
24
SV2
PMW
11
10
SV1
KM5 KM4 KM1 KM3
3
HP
N
L
OL5
J1
16
15
OL4HP
J18
LP
R
N
24 25 26
KM4
OL4
2321 22
19
OL5
KM5
T3T1
T2
L1
S
81
TH4
1.8A3.3A
N
TS
380V/3N~/50Hz
R
18
KM1
OL1
T3
T2
T1
OL2
KM2
HPT
TR
FU
EXV14WV
DB3A
OLHP
LPT
KM EXV4
Description of components and parts :
Symbol Description Symbol Description
Phase-loss/reverse protector
System electronic expansion valve
Fuse
Four-way valve
Contactor
High-pressure switch
Low -pressure sensor
High-pressure sensor
Transformer
Overload protector
Over cooling electronic expansion valve 4
OFF
OFF
OFF
OFF
S3.3 S3.4
OFF
OFF
OFF
OFF
S3.2S2.3S2.1
OFF
S2.2 S3.1
ON
ON
ON
ON
OFF
OFF OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
S1.1
OFF
OFF
OFF
OFF
S1.2
DIP switch settings :
Model
OL4 OL5
14.0
OL3OL2
14.014.0
OL1
Overload protection settings :
compressor 1 compressor 3compressor 2 Fan motor
Shaft heater
Shaft heater
Shaft heater
BLACK
WHITE
BROWN
YELLOW
BLUE
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLUE
YELLOW
RED
BLACK
WHITE
Air suction temperature sensor TH12
Over cooling circuit outlet temperature sensorTH11
After over cooling circuit temperature sensor TH10
Before over cooling circuit temperature sensor TH9
Ambient temperature sensor TH8
Coil inlet temperature sensor TH2
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.
-49-
Design & installation Guide For McQuay MDS Multi System
Outdoor
220V/1~/50Hz
QF
Communication wire
Communication wire Communication wire
Main power
terminal support
Main power
terminal support
Main power
terminal support
Main power
terminal support
Unit electric control box
Unit electric control box
Main board
Communic-
ation port
Unit electric control box
Main power
terminal support
Unit electric control box
L N
Power
supply
Power
supply
Power
supply
Power
supply
Indoor unit 1 Indoor unit 2
Indoor
220V/1~/50Hz
220V/1~/50Hz
220V/1~/50Hz
220V~/50Hz
N
L
N
L
N
L
Shielded wire
Notes:
1.The J1 of the control module sets the inside unit number. The first digit
of indoor unit J2 which is at the end of the bus is set to ON.
2. For specifications of the power cable, refer to the Installation Manual.
3. To avoid interference of strong electricity to weak electricity, the communication
cables of the power box are distributed separately.
4. The indoor units are powered from the same power supply.
Main board
Communic-
ation port
Main board
Communic-
ation port
Main board
Communic-
ation port
Main board
Communic-
ation port
Unit electric control box
RST
N
N
L
N
L
N
L
N
L
QF
L1 L2 L3 N
380V/3N~/50Hz
220V/1~/50Hz
220V~/50Hz
220V~/50Hz
Unit electric control box
Unit electric control boxUnit electric control box
Power
supply
Power
supply
Power
supply
Power
supply
Notes:
1.The J1 of the control module sets the inside unit number. The first digit
of indoor unit J2 which is at the end of the bus is set to ON.
2. For specifications of the power cable, refer to the Installation Manual.
3. To avoid interference of strong electricity to weak electricity, the communication
cables of the power box are distributed separately.
4. The indoor units are powered from the same power supply.
Outdoor
Communication wireCommunication wire Communication wire
Communication wire
Main power
terminal support
Indoor unit 1 Indoor unit 2
Indoor
Shielded wire
Main power
terminal support
Main power
terminal support
Main power
terminal support
Main power
terminal support
Main board
Main board
Main board
Communic-
ation port
Main board
Communic-
ation port
Main board
Communic-
ation port
Unit electric control box
Unit electric control box
2.7.2 MDS050A/AR MDS060A/AR
2.7 Electric Connection
2.7.1 MDS030A/AR MDS040A/AR MDS050A/AR
-50-
Design & installation Guide For McQuay MDS Multi System
2.7.3 MDS080 240B/BR
BA
B
A
J2
BA
B
in
A
pc
A
in
B
pc
Connecting central control(optional)
B
in
A
pc
AB
pc
RST
N
QF
L1 L2 L3 N
380V/3N~/50Hz
Communication wire
Communication wire
Indoor unit 1 Indoor unit 2
Indoor unit 3
Indoor unit i
Shielded wire
Main board
Communic-
ation port
Unit electric control box
Outdoor Indoor
Main board
Communic-
ation port
Main board
Communic-
ation port
Main board
Communic-
ation port
Communication wire
Main power
terminal support
The communication cable at the end of
indoor unit J2-1 needs to be set to ON.
Te
rm
in
a
l a
m
plifie
d figu
re
2.7.4 MDS260 300B/BR
Slave unit
AB
AB
in
B
in
A
pc
AB
pc
Master unit
in
B
in
A
pc
AB
pc
RST
N
QF
L1 L2 L3 N
380V/3N~/50Hz
RST
N
QF
L1 L2 L3 N
380V/3N~/50Hz
B
A
J2
Indoor unit 1
Indoor unit i
Indoor unit 2
Main board
Communic-
ation port
Main board
Communic-
ation port
Main board
Communic-
ation port
Outdoor
Outdoor
Indoor
Unit electric control box
Main board
Communic-
ation port
Main board
Communic-
ation port
Main power
terminal support
Connecting central control(optional)
Unit electric control box
Main power
terminal support
Communication wire Communication wire
Communication wire
Communication wire
The communication cable at the end of
indoor unit J2-1 needs to be set to ON.
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Design & installation Guide For McQuay MDS Multi System
Note:
All the wiring should be fixed;
Electric wiring must not touch the refrigerant pipe, compressor and fan motor;
All wiring between indoor unit and outdoor unit should be neoprene copper core, and section area of cable should
be in accordance with above requirements.
2.8 Electric Data
2.8.1 Outdoor Unit MDS
Model
MDS080B/ MDS100B/ MDS120B/ MDS150B/ MDS180B/ MDS200B/
MDS080BR MDS100BR MDS120BR MDS150BR MDS180BR MDS200BR
Power supply 380V /3N /50Hz
Cross section area(mm2)
610
Q.T.Y 5
Power
cable
Model
MDS220B/ MDS240B/ MDS260B/ MDS280B/ MDS300B/
MDS220BR MDS240BR MDS260BR MDS280BR MDS300BR
Power supply 380V /3N /50Hz
Cross section area(mm2)
10 16
Q.T.Y 5
Power
cable
Model
MDS030A/ MDS040A/ MDS050A/ MDS060A/ MDS050A/ MDS060A/
MDS030AR MDS040AR MDS050AR MDS060AR MDS050AR MDS060AR
Power supply 220V /50Hz 380V /3N /50Hz
Cross section area(mm2)
6(2.5) 4(2.5)
Q.T.Y 2(1) 4(1)
Power
cable
2.8.2 Indoor unit MCC
Model MCC008T MCC010T MCC015T MCC018T MCC020T MCC025T MCC030T MCC040T MCC050T MCC060T
Power supply 220V /50Hz
Cross section area(mm2)
1.5 2.5
Q.T.Y 3
Power
cable
2.8.3 Indoor unit MCK
Model
MCK010T MCK150T MCK180T MCK020T MCK025T MCK030T MCK040T MCK050T
Power supply 220V /50Hz
Power
Cross sectionarea(mm2)
1.5 2.5
Q.T.Y 3
cable
2.8.4 Indoor unit MDB
Model MDB050T MDB060T
Power supply 220V /50Hz
Power
Cross section area(mm2)
2.5
Q.T.Y 3
cable
2.8.5 Indoor unit MCM
Model MCM020T MCM030T MCM050T
Power supply 220V /50Hz
Cross section area(mm2)
2.5
Q.T.Y 3
Power
cable
2.8.5 Indoor unit MWM
Model MWM008T MWM010T MWM015T MWM020T MWM025T
Power supply 220V /50Hz
Cross section area(mm2)
1.5 2.5
Q.T.Y 3
Power
cable
-52-
Design & installation Guide For McQuay MDS Multi System
Selection
CHAPTER
3
3.1 Load Calculation
3.1.1 Planning and Cooperation
McQuay recommends you to estimate and plan the following before engineering.
Based on the air conditioning area function, calculate cooling/heating load (depending on the
temperature,humidity, and ventilation).
Query related meteorologic information, especially the sun light, wind direction in winter and
summer, the ambient cooling/heating sources, and other external factors that may affect the
running of the units. Then decide the place and azimuth to place the units based on the
environmental factors favoring the normal running of the units. For the outdoor meteorologic
parameters of each city in China, see
Annex 1 Outdoor meteorologic parameters of major
cities in China . However, the description about selection in this manual is only for your
reference; for actual engineering, please consult with a professional design institute or related
construction unit in this area.
Develop the project schedule, plan the installation space of the unit, and adjust the engineering
associated with the constructional engineering and inside finishing.
Through field survey, ascertain the size of the entrance for the air conditioner, the weight
capacity of the place to put or hang the equipment, the range of the auxiliary engineering, and
the location of the power supply.
Check and verify the calculated of the design. Confirm and determine the model and specifications
of the unit.
3.1.2 Cooling Load Calculation
The cooling load of the air conditioning area is determined by the real-time maximum cooling
load or accumulated calculated cooling load of each room based on the area, storey height,
and usage of the room serviced. It also includes the additional cooling load caused by the
ventilator blower, the exhauster, and the air pipe system. In actual engineering, the total
cooling load is calculated as follows:
Q
total
= F1q1 + F2q2+ + Fnq
n
Where,
F1 -----The air conditioning area of each calculated unit (Unit: m2.)
q
1
-----The cooling load per unit area of each calculated unit (Unit: W/m2).
Annex 2 (1) lists the estimated indexes and design parameters of the air conditioner cooling
load of different buildings for your reference.
3.1.3 Heating Load Calculation
The heating load of the air conditioning system is closely related with the heat insulation
performance of the walls, doors and windows, and roof. It is also affected by the penetration of
cool wind from outdoors, open frequency of the outside door, and the use of the indoor
appliances. It is calculated basically in the same way as the cooling load. If the heating load per
unit area of the building q
F
is known (see Annex 2), the heating load of the building is as follows:
Q = Fq
F
Where,
F -----The construction area (Unit: m2)
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Design & installation Guide For McQuay MDS Multi System
If we know the heat performance index qv[W/(m3 . )] and outside volume V (m3), we can
calculate the heating load
as follows:
Q
total
= aqvV( tntw)
Where,
a is the correction factor. For details, see the table.
q
v
is the heat performance index of the building. It is the heating load when the difference between
the indoor temperature and the outdoor temperature is 1
. For details, see the table.
V is the outside volume of the building. (Unit:m
2
)
(t
n
-tw) is the calculated difference between the indoor and outdoor temperatures. (Unit: )
Heating outdoor temperature
a Heating outdoor temperature a
0 2.05 -25 1.08
-5 1.67 -30 1.00
-10 1.45 -35 0.95
-15 1.29 -40 0.9
-20 1.17
Notes
During selection, you must consider the following factors which affect the cooling and heating attenuation
and correction: 1) Length of the pipe connecting the indoor unit and outdoor unit; 2) Difference between the
actual ambient temperatures of the indoor/outdoor units and the rated working temperatures of the MDS
for cooling/heating.
If the heating pump system is selected according to the cooling load, you must verify its heating capacity.
Especially in the areas north to Yellow River, inadequate heating capacity must be compensated
with a model with an auxiliary electric heater or hot-water coil pipe.
The MDS unit is designed according to GB/T 18837-2002. There is a negative difference of about 5% between
the actual cooling capacity and the rated capacity. Therefore, you must fully consider this factor during selection
and ensure certain cooling capacity factor.
Heat performance index of the building
Building type V (103 m3)qvW/m
3
t
n
Building type
V(103 m3)qv W/m
3
t
n
5 0.6 5 10 3.38
Office 5
10 0.53 18 Workshop 11 20 2.73 14
building 11
15 0.49 21 30 2.04
15 0.56 31 1.45
5 0.72 0.5 2.30
Club 5 10 0.65 16 Equipment 0.6 1.0 0.82 12
11 0.58 room 1.1 2.0 0.71
2.1 0.50
5 0.81 0.5 0.83
Hospital 6
10 0.75 20 0.6 1.0 0.72 18
11
15 0.67
Auxiliary room
1.1 2.0 0.56
16 0.64 2.1 0.51
5 0.92
6
10 0.82
Fire engine
2.0 0.72
Cinema 11
15 0.79 14 2.1 5.1 0.63 15
16
20 0.70 house
5.1 0.60
21
30 0.65
31 0.61
5 1.22 5.0 1.49
Public area 6 10 1.14 14 Bathroom 5.1 10.0 1.38 25
11 1.05 10 1.25
Heating correction factor a:
-54-
Design & installation Guide For McQuay MDS Multi System
3.2 Selection of Indoor Units
The selection of indoor unit should be based on the several factors, including customer
s requirement, indoor air distribution, indoor decoration, etc. Ceiling concealed, ceiling
cassette, high pressure duct unit and ceiling exposed are available now.
The indoor unit should be selected to meet the actual indoor load demand. The nominal
cooling capacity should be is more than or equal to the actual indoor load demand.
As the indoor total capacity is different from the outdoor total capacity, the actual indoor
cooling capacity may be different from the nominal capacity, and it should be calculated
in accordance with the outdoor capacity table.
For ceiling concealed and duct unit, McQuay has several types such as standard unit,
auxiliary electric heater, auxiliary hot water heater, etc.
The selection is based on the following factors:
Cooling capacity/ heating capacity
Auxiliary heater capacity ( optional )
Air flow
External static pressure
Dimension
Power supply and others.
Selection step
Select the type of the indoor unit:
1. Are the units ceiling concealed, ceiling cassette, high pressure duct unit or ceiling exposed
?
2. Are the units cooling only, heat pump, auxiliary electric heater or auxiliary hot water
heater?
Calculate the cooling capacity and heating capacity
Confirm the model and the quantity
According to the cooling capacity, heating capacity, return air temp, ambient temp,
humidify and air flow, we can choose the model and confirm the quantity.
The ESP of the unit can be confirmed according to the air flow and the duct parameter.
Confirm the heating capacity. If the unit selected can meet the heating requirement,
then it is OK, but if can not, then we should select auxiliary hot water heater or
auxiliary electric heater.
For the cooling only unit, the actual total cooling capacity can be gotten through the
following formula: Actual total cooling capacity = Actual capacity x QTY
For the heating only unit, the actual total heating capacity can be gotten through the
following formula: Actual total heating capacity = Actual capacity x QTY + ( Auxiliary
heating capacity)
The best selection is that both the cooling capacity and the cooling capacity can meet
the requirement. Please note that the nominal cooling capacity and the nominal heat-
ing capacity is obtained in the standard condition. When the units run in nonstandard
condition, the actual cooling capacity and the actual heating capacity are different
from the nominal cooling capacity and the nominal heating capacity.
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Design & installation Guide For McQuay MDS Multi System
3.3 Selection of Outdoor Units
For the allowed combinations, please refer to the "Total Capacity Indexes of a Combination of
Indoor Units" table.
The standard combination is the one with which the total indoor unit capacity is most proximate
to but less than 100% of the capacity of the outdoor unit combination.
3.3.1 Capacity Indexes of Outdoor Units
3.3.3 Capacity Indexes of Indoor Unit (MCK)
3.3.4 Capacity Indexes of Indoor Unit (MCM)
3.3.2 Capacity Indexes of Indoor Unit (MCC)
Unit spec 010 015 018 020 025 030 040 050
Capacity index 28 36 45 54 65 75 100 125
3.3.5 Capacity Indexes of Indoor Unit (MDB)
Unit spec 050 060
Capacity index 125 140
3.3.6 Capacity Indexes of Indoor Unit (MWM)
Unit spec 008 010 015 020 025
Capacity index 22 28 35 54 65
Outdoor unit
Rate of a combination of indoor units
130% 120% 110% 100% 90% 80% 70% 60% 50%
MDS030A(R) 111 102 94 85 77 68 60 51 43
MDS040A(R) 130 120 110 100 90 80 70 60 50
MDS050A(R) 163 150 138 125 113 100 88 75 63
MDS060A(R) 195 180 165 150 135 120 105 90 75
MDS080B(R) 319 294 270 245 221 196 172 147 123
MDS100B(R) 364 336 308 280 252 224 196 168 140
MDS120B(R) 423 390 358 325 293 260 228 195 163
MDS150B(R) 520 480 440 400 360 320 280 240 200
MDS180B(R) 618 570 523 475 428 380 333 285 238
MDS200B(R) 650 600 550 500 450 400 350 300 250
MDS220B(R) 715 660 605 550 495 440 385 330 275
MDS240B(R) 845 780 715 650 585 520 455 390 325
MDS260B(R) 910 840 770 700 630 560 490 420 350
MDS280B(R) 975 900 825 750 675 600 525 450 375
MDS300B(R) 1040 960 880 800 720 640 560 480 400
Unit spec 008 010 015 018 020 025 030 040 050 060
Capacity index 20 25 37 45 56 65 78 106 124 144
Unit spec 020 030 050
Capacity index 58 75 125
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Design & installation Guide For McQuay MDS Multi System
3.3.7 Actual Capacity Calculation
Based on the model and combination rate of the outdoor unit, select an appropriate door
unit capacity table. Then find out the capacity of the outdoor unit (kW) and that of each
indoor unit (kW) according to the related temperatures of the indoor and outdoor units.
The formula is as follows:
IUC=OUC x (INX/TNX)
Where,
IUC is the actual capacity of each indoor unit.
O
UC
is the capacity of the outdoor unit. unit: kW.
I
NX
is the capacity index of each indoor unit.
T
NX
is the total capacity index.
The capacity of indoor units changes with the length of the refrigerant pipe. If the
capacity after change is less than the load, replace the unit with one with larger capacity
and calculate
and select the model again.
3.3.8 Change of Cooling Capacity (3-30HP)
50
40
30
20
10
H
ig
h
-lo
w
fa
lls
(m
)
0
-10
-20
-30
-40
0 10 20 30 40 50 60 70
94.0%97.5%100%
100%
98.5%
94.0%
95.5%
97.0%
92.5% 91.0% 89.5% 88.0% 86.5%
79.0%88.0%91.0%
9080 100
85.0%
110
83.5%
85.0%
120
82.0%
130
80.5%
82.0%
140
79.0%
150
Pipe length (m)
Read the performance correction factor of the refrigerant pipe length and height drop from the
figure. When the height drop is negative, the outdoor unit is installed below the indoor unit.
If there is snow on the heat exchanger or the outdoor temperature drops to 7
-
5
when
the air conditioning system is heating, frosting occurs. As this will reduce the heating
performance, the air conditioner will automatically defrost once every 40 min to 70 min. During
the defrosting, the air conditioner will stop heating and the fan of the indoor unit will also stop
for three to ten minutes.
The heating capacity tables of outdoor and indoor units do not reflect the reduction of performance
caused by defrosting.
3.3.9 Change of Heating Capacity (3-30HP)
H
ig
h
-lo
w
fa
lls
(m
)
50
40
30
20
10
0
-10
-20
-30
-40
010 20 30 40 50 60 70 9080 100
Pipe length (m)
100%
99.0%
98.0%
97.0%
96.0%
100%
98.0% 96.0% 94.0% 92.0%
95.0% 94.0%
93.0% 92.0% 90.0%
110
86.0%
89.0%
120
90.0%
88.0%
130
87.0%
140
88.0%
86.0%
150
85.0%
-57-
Design & installation Guide For McQuay MDS Multi System
27
0.65
0.60
0.70
0.80
0.90
0.95
Correction factor
1.00
1.05
1.10
1.15
26
24
22
20
18
16
14
12
10
-15
-10
-5
0
5
10
15
16
3.3.11 Temperature-related Heating Capacity Correction Factors
3.3.10 Temperature-related Cooling Capacity Correction Factors
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Design & installation Guide For McQuay MDS Multi System
3.4 Design of Air System
The air cooled pipeline unit is an important and complex part of the air system. The air system must
be designed in compliance with Design Code for Heating, Ventilation and Air Conditioning and
Code of Design on Building Fire Protection.
The air pipe diameter, processing, air outlet, muffling static pressure box, fire protection valve,
insulation and indoor airflow layout must be designed professionally and well implemented, so as
to achieve an ideal effect of comfortableness and energy saving. The following information or data
is a reference for users to design.
3.4.1 Design of the Air Flow, Air Pipe and Air Outlet
The air should be supplied to the indoor space in a volume corresponding to the load at a most
comfortable speed, so as to achieve comfortable air conditioning.
Air outlet design & calculation
Air supply is to supply cool/hot air to a room or specified air conditioning area, and to mix
the indoor air and supply airflow to the room temperature.
The direction and guiding force of the air outlet vary with the outlet shape and type. Select
according to the purpose.
Determine the volume and arrival distance of air supply from a single outlet according to
the para-meters in the product catalog. Select the air outlet and return outlet type that
matches the ceiling pattern according to the room shape. In addition, the relationship
between air speed and noise should be considered to determine the outlet air speed.
Annex 3 is for your reference only.
Air flow pattern
Air outlet selection
In the designing of the air-flow pattern, determine the type of the air outlet according to air
conditioning accuracy, air-flow type, air outlet installation position and construction fittment art.
Common types of the air outlet
Side air outlet
The shutter air outlet is generally used. The shutter can be louver shutter to adjust the air flow and
direction. Besides, grille air outlet and slotted air outlet are also used. These two outlets can well
match with the construction decoration.
Air diffuser
The air diffuser is the air outlet installed in the ceiling, supplying air flow from top to bottom.
Orifice plate air outlet
The orifice plate air outlet features even air supply and fast air flow attenuation. It applies to the
room where even air flow and little temperature difference are needed.
Jet air outlet
The jet air outlet features long range and low noise. It applies to large public buildings, such as
gymnasium and cinema.
Whirl air outlet
The whirl air outlet features good mixture of supplied air and indoor air and fast-speed attenuation.
It applies to the floor air supply in the computer room.
No. Return air flow pattern Range Advantages and disadvantages
Side air supply
upper air return
Upper air supply
upper air return
Side air supply
side air return
The room with low floor height
The room with low floor
height or large depth
The room with high floor height
and only for cooling in Summer
The fan coil of air pipe in the exposed ceiling makes the fittment
easy. But, higher floor height is required and certain exposed ceiling
space is occupied.
Staffs are in the return air flow area, need for little or no space, and the
air vent can be adjusted freely. But, the exposed ceiling in the room
has two difference heights or there are two exposed ceilings.
Staffs are in the return air flow area, the fan coil of the unit does not
occupy the indoor space in the corridor, and the air vent can be
adjusted freely.But, short-flow may occur easily.
1
2
3
-59-
Design & installation Guide For McQuay MDS Multi System
3.4.2 Calculation of the Air Pipe Resistance
The air resistance in the air outlet and return air inlet cause pressure loss when the air pipe is being
used, and the unit can supply air only when it overcomes the resistance. It is equal to the air
pressure of the unit with pressure loss, that is, exterior static pressure (ESP).
The pipe resistance must be equal to the ESP. Otherwise, the air volume will be too large or too
small causing the unit failure.
To determine the ESP of the unit, get the whole-static pressure of the air pipe. In this case, it is
generally required to calculate the static pressure loss of the air pipe at the farthest point or
maximum static pressure.
Calculation method of the air pipe resistance
Preliminary determination of the air pipe resistance:
Air pipe resistance=R
m
L(1+K) (Pa)
R
m
=0.8~1.5Pa/m
L: Total length of the air pipe with the loop of most resistance, m
K: Ratio of local resistance loss to frictional resistance. If there are few local components,
k=1~2; if there are many local components, k=3~5
Draw the ventilation system diagram, mark the air flow by segment and number each
pipe segment.
Assume the air speed (refer to annex 4), and calculate the cross-section dimension and
the pipe diameter.
Check the air speed according to the actual pipe diameter, and calculate the actual
speed, which should not be higher than the recommended value in the design manual.
The conflux of the return air inlet brings little affect on the air flow pattern in the room. So, its structure
is simple. Some only have a metal mesh in the orifice, or a shutter or grille.
The return air inlet location and shape depend on the air flow pattern. If it is installed in the lower
area of the room, the lower edge of the inlet must be at least 0.15 m away from the ground.
The return air inlet structure may be simple, but should be equipped with air volume adjustment
device.
Size of the air outlet
Determine the air volume and type of a single air outlet according to the number of air outlets to be
installed and the volume requirements in the room where the air conditioner will be installed. Make
sure there is no overlapping between the set air volume and the minimum diffusion radius, and the
maximum diffusion radius covers the whole room. In addition, check whether the vertical arrival
distance is adequate, and determine the air speed in the air outlet at the acceptable noise level.
Air flow pattern diagram
(a)side air supply bottom air return (b)bottom air supply upper air return
(c)upper air supply bottom air return
(d)upper air supply upper air return
Air flow pattern diagram
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Design & installation Guide For McQuay MDS Multi System
Specifications of the rectangle air pipe
Unit: mm
Side size of the air pipe
120 320 800 2000 3000
160 400 1000 2200 3500
200 500 1250 2500 4000
250 630 1600 2800
Select the loop with most resistance and that with minimum resistance, and then
calculate the frictional resistance and local resistance loss of each pipe segment.
Check the unbalance ratio of the loop of most resistance to that of minimum resistance
must be less than 15%. Otherwise, redesign the air pipe system, or satisfy the balance
ratio requirements by adjusting with the valve.
3.4.3 Air Pipe Design
To improve the operational efficiency of air conditioning, carefully consider and fully install
such fittings as material, adjustment valve and fire protection valve.
Material of the air pipe
The air pipe is always made from metal material, such as sheet steel, galvanized sheet
or aluminum sheet. It also can be made from non-metal material, such as hard polyvinyl
chloride, glass reinforced plastic or other composite materials. The air pipe in the construction space or duct channel also can be used according to the actual conditions. The air pipe
surface should be polished, straight and smooth. Some air pipes should even be painted.
The air duct channel should be waterproofed. The air pipe in the room with corros ive gas
may be made from glass reinforced plastic or plastics and tightly sealed.
Air pipe shape
The cross-section of the air pipe is generally rectangle or round. It also can be
designed to ellipse, semicircle or spiral.
The round air pipe has the advantages of high strength and low material loss, but it
occupies large useful space and its elbow and tee should be of long distance.
Generally, the flexible round air pipe is used for the new air pipe, small volume air
refnet joint (such as in toilet with small area).
The rectangle air pipe occupies small space, and is easy to install and neat for surface
mounting. It has been widely applied.
For the convenience of mechanical processing of the air pipe and flange and
configuring standard valves, try to improve the utilization of the air pipe cross section.
The air pipe dimension should be designed according to Calculation Form of National
Universal Air pipe. The ratio of the height of the rectangle air pipe to its width should
be less than 4, based on the outer diameter or length of external sides. The following
table shows the standard specifications of the air pipe.
Specifications of the round air pipe
Diameter of the air pipe
Basic series Auxiliary series Basic series Auxiliary series Basic series Auxiliary series
100 80/90 320 300 900 850
120 110 360 340 1000 950
140 130 400 380 1120 1060
160 150 450 420 1250 1180
180 170 500 480 1400 1320
200 190 560 530 1600 1500
220 210 630 600 1800 1700
250 240 700 670 2000 1900
280 260 800 750
The high-speed air pipe is generally round spiral pipe with a larger thickness.
Unit: mm
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Design & installation Guide For McQuay MDS Multi System
Reinforcement of the air pipe
Generally, the air pipe is reinforced through using the ridge web and ridge lines, or adding
flanges or reinforcing frames. Strictly follow the newest national standard Ventilation and
Air Conditioning Engineering and Acceptance Standard when making and installing the
pipes.
Accessories of the air system
The air system has following accessories: air outlet/return air inlet, outside rainproof
shutter, air flow adjusting valve, smoke discharge & fireproof valve, and air deflector. The
smoke discharge & fireproof valve must be tested before installed. The surface of the air
outlet and the return air inlet must be smooth and even. The size of the neck part must be
within the allowed deviation range so that it can engage with the air pipe tightly. The entire
air conditioning system, including all the accessories, should be firm and tight, and, after
installed, it should be pass the light leakage or air leakage acceptance check for a lowpressure air pipe system.
Heat insulation of the air system
The heat insulating layer of the air pipe system should also be non-flammable. Generally,
it is 25 mm thick if it is PE materials, or at least 35 mm when consisting of common glass
cotton. This layer should be even, dense, closely attached to the air pipe and its accessories,
and without cold bridges. It should also be well protected against scratch.
Design and calculation of fresh air flow
The fresh air volume mainly depends on the health requirements, the supplementary local air
exhaust volume, and therequirement to guarantee the air conditioned room in positive
pressure
.
Health requirements
Generally, in both the country and the city, the content of carbon dioxide outdoor is 0.5-
0.75g/kg. According to the allowed density of this gas (see the following table), you can use
the overall ventilation volume defined in the Industrial Ventilation to calculate the volume
of fresh air needed to eliminate it.
Elbow
The rectangular air pipe can be inner-arc or inner-slanting, as shown in Figure. When the
longest side A is 500 mm or longer, a flow deflector must be used.
Wall thickness of the air pipe
The wall thickness directly relates to the effect and life of the pipe.Too thin wall will cause
unstable installation, and thus the pipe will heavily with noise increased. Even worse, the friction
might compound the problem, shortening the service life of the air pipe or even the entire air
conditioning system.
Air pipe elbow
(a) inner and outer-arc elbow (b) inner-arc elbow (c) Inner-slanting elbow
320 340 450 480 630 670 1000 1120 1250 1320 2000
Low-speed air pipe 0.5 0.6 0.8 1.0 1.2
High-speed air pipe 0.8 0.8 0.8 1.0 1.2
Round air pipe 0.5 0.6 0.8 1.0 1.2
Connection mode Insertion Flange
Unit: mmRecommended thickness of steel air pipes and accessories
Diameter of round air pipe or
length of the longest side of rectangular air pipe
Rectangular
air pipe
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Design & installation Guide For McQuay MDS Multi System
Acceptable (CO2) density
Room type
Acceptable CO
2
density
L/m
3
g/kg
Place where people stay for a long time 1 1.5
Place where children and patients stay 0.7 1.0
Place where people stay
1.25 1.75
regularly (government agency)
Place where people stay for a short time
2 3.0
In actual practice, the fresh air volume is generally 30m2/h person or more, no matter how
much room space a person occupies.
For densely populated buildings, such as air conditioned gymnasiums and meeting rooms,
as the room space per capita is less and every one stays shorter, the fresh air volume can
be calculated on a basis of 7-15m2/h.person. However, as the fresh air volume got by this
way will count for 30% to 40% of the total air volume and it will greatly affect the cooling
capacity, you must be careful in deciding it.
Supplementary of air discharge
When the air conditioned room has an exhaust system, the air conditioning system must
have corresponding fresh air volume to complement the exhaust volume. Generally, it is
recommended to use an exhaust volume that is 80% of the fresh air volume for
comfortable air conditioning.
Keeping the air conditioned room in positive pressure
To prevent outside air (those from outdoor and adjacent rooms with less strict air
conditioning requirements) from penetrating the room and affecting the temperature/
humidity or the cleanness of the air conditioned room, the air conditioning system needs
to use a certain volume of fresh air to keep the room in
positive pressure , that is, the
atmospheric pressure of the room is higher than that of outside). Generally, the indoor
positive pressure is 5~10Pa. Too high positive pressure not only is a waste, but also
makes the system run less cost-effectively. In actual engineering design, the fresh air
flow should count for 10% or more of the total inlet to guarantee the air is healthy and
comfortable.
Introduction of fresh air
The inlet of fresh air should be at a clean place outdoor. It should be away from the
air discharge outlet and leeward to smoke, dust, and other harmful and toxic sources.
To avoid dust, the fresh air inlet should be at least 2m above the ground, or 1m above
the ground if it is placed in a green belt.
To introduce less hot air from outdoor in the summer, the inlet should be placed at the
shade side of the building.Generally, it is placed on the northern wall, not at the roof
or on the west wall.
Configure waterproof shutters, metal web, and air flow adjustment valves to fresh air
inlet if necessary.
To guarantee the quality of the introduced fresh air and the ambient temperature, do
not place the fresh air inlet near to the outdoor unit which has a condenser or put it near
to the exhaust outlet.
Generally, the size of the fresh air inlet depends on the air volume and air speed. For
the air speed, refer to Annex 4.
Note
For heat pump unit, you should consider the effects of layer height to the air conditioning effects.
When the layer height is 3m or more, you should select an appropriate air inlet to improve the air
flow pattern and the blown-in air flow.
-63-
Design & installation Guide For McQuay MDS Multi System
3.5 Slection of Refnet Joint
3.5.1 Copper Pipe Selection ( MDS100BR )
Diameter of the main pipe and that of the remotest pipe(equivalent length<90m)
Main pipe:
12.7/ 28.6(the same as the outdoor unit
The remotest pipe: the same as the indoor unit
Refer to the refrigerant pipe to calculate the cooling capacity of downstream A
A-B-C: 17.4 kW
A-D-E: 11.8 kW
Select the pipe diameter of downstream A
Diameter of A-B:
12.7/ 25.4
Diameter of A-D: 9.52/ 19.05
We can use the same method to select the pipe diameter of downstream B and D.
Diameter of B-C:
9.52/ 19.05
Diameter of D-E:
9.52/ 15.88
3.5.2 Refnet Joint Selection
Refer to the refnet joint specification to select the refnet joint for Point A.
A: Refnet joint to liquid pipe: MDS-Y2
A: Refnet joint to gas pipe: MDS-Y1
We can adopt the same method to select the refnet joint for point B to D.
B: Refnet joint to liquid pipe: MDS-Y2 B: Refnet joint to gas pipe: MDS-Y1
C: Refnet joint to liquid pipe: MDS-Y2 C: Refnet joint to gas pipe: MDS-Y4
D: Refnet joint to liquid pipe: MDS-Y2 D: Refnet joint to gas pipe: MDS-Y4
E: Refnet joint to liquid pipe: MDS-Y2 E: Refnet joint to gas pipe: MDS-Y2
-64-
Design & installation Guide For McQuay MDS Multi System
The following tables show the refrigerant copper pipe dimension specifications.
For MDS-A series
For MDS-B series
8.0HP
12.0HP
15.0HP/18.0HP 22.0HP 26.0HP/28.0HP
Specification 10.0HP 20.0HP 24.0HP 30.0HP
Between the outdoor unit and the first tap joint
Liquid pipe
12.7mmxt1.0 15.88mmxt1.2 15.88mmxt1.2 19.05mmxt1.2 19.05mmxt1.2
Gas pipe
28.6mmxt1.2 28.6mmxt1.2 34.9mmxt1.4 38.1mm xt1.6 41.3mmxt1.6
Between the tap joints
<15kW
9.52mm x t0.8
15kW
22.5kW
12.70mm x t1.0
22.5kW 50kW
12.77mm x t1.0
15.88mm x t1.2
50kW 85kW 19.05mm x t1.2
<9.0kW
15.88mm x t1.2
9.0kW
15kW 19.05mm x t1.2
15kW
21kW 25.40mm x t1.2
21kW
31kW 28.06mm x t1.2
31kW
39kW 31.75mm x t1.4
39kW
50kW 34.9mm x t1.4
50kW
69kW 38.1mm x t1.6
69kW
85kW 41.3mm x t1.6
Between the tap joint and the indoor unit
The indoor unit to which the pipe is connected. Consistent to the indoor unit port
The indoor unit to which the pipe is connected. Consistent to the indoor unit port
Liquid pipe
Total capacity
of the indoor
unit to which
the pipe is
connected.
Total capacity of
the indoor unit to
which the pipe is
connected.
Outdoor unit capacit
Liquid
pipe
Gas
pipe
Gas pipe
Specification
3.0HP 4.0HP/5.0HP 6.0HP
Between the outdoor unit and the first tap joint
Liquid pipe
9.52mmxt0.8 9.52mmxt0.8 9.52mmxt0.8
Gas pipe
15.88mmxt1.2 19.05mmxt1.2 19.05mmxt1.2
Between the tap joints
<16kW
9.52mm x t0.8
16kW
22.5kW
>22.5kW
<9.0kW 15.88mm x t1.0
9.0kW
16kW 19.05mm x t1.2
16kW
21kW
>21kW
Between the tap joint and the indoor unit
<4kW
6.35mm x t0.7
4kW 9.52mm x t0.8
<2.8kW
9.52mm x t0.8
2.8kW
4.5kW 12.70mm x t1.0
4.5kW
8kW 15.88mm x t1.2
>8kW
19.05mm x t1.2
Outdoor unit capacit
Liquid
pipe
Gas
pipe
Total capacity of
the indoor unit to
which the pipe is
connected.
Total capacity of the
indoor unit to which the
pipe is connected.
Liquid
pipe
Gas
pipe
Total capacity of
the indoor unit to
which the pipe is
connected.
Total capacity of
the indoor unit to
which the pipe is
connected.
-65-
Design & installation Guide For McQuay MDS Multi System
Unit: mm
Refnet joint type selection
Y type
Type: MDS-Y5
Unit: mm
Refnet
Length (mm) Diameter
(mm) Diameter (mm) Diameter (mm)
joint type
ABCD
E(outer
FG H
I
(outer
JKLM
N
(outer
OPQ R
diameter)
diameter)
diameter)
MDS-Y1 553 172 293 120 28.6 28.9 25.7 22.5 28.6 28.9 25.7 22.5 19.3 22.2 19.3 16.1 12.9 9.7
MDS-Y2 420 142 223 80 15.88 16.1 12.9 9.7 12.7 12.9 9.7 6.5 12.7 12.9 9.7 6.5
MDS-Y3 420 142 223 80 15.88 16.1 12.9 9.7 12.7 12.9 9.7 6.5 15.88 16.1 12.9 9.7
MDS-Y4 493 142 223 80 22.2 22.5 19.3 16.1 19.1 19.3 16.1 12.9 9.7 19.1 19.3 16.1 12.9
-66-
Design & installation Guide For McQuay MDS Multi System
OD ͺ9.7
204
80 8080
OD ͺ12.9
OD ͺ16.1
OD ͺ19.3
250
550
E
D
C
B
A
Refnet joint type ͺ(mm)
Refnet
joint type
MDS-C2
MDS-C3
28.6
A(outer
diameter)
25.4
28.9
B
25.7
25.7
C
22.5
22.5
D
19.3
19.5
16.1
E
Four places of silver
& copper brazed
Unit: mm
Type MDS-C2 MDS-C3
Type : MDS-C1
Unit: mm
3.6 EXV Box Reference Table
To reduce the noise of indoor unit, MDS system is using external EXV Box. For different EXV Box model,
please refer to the table below :
Indoor Unit EXV Box Model
MCC008/010/015
MCK010/015
MWM020 MEX-18-2SA-B
MWM025
MEX-18-3SA-A
MEX-18-3SA-B
MCC030/040/050/060
MCK030/040
MCM030
MCK050
MEX-30-3SA-A
MCM050
MEX-14-2SA-A
MEX-14-2SA-B
MEX-24-3SA-A
MWM008/010/015
MCC018/020/025
MCK018/020/025
MCM020
-67-
Design & installation Guide For McQuay MDS Multi System
Installation
CHAPTER
4
4.1 Outdoor Unit Installation
To choose location of installation
To ensure good cooling and heating performance of the units, follow up the below to pick up right
place to install units:
To avoid discharged air returns to the air inlet, to avoid hot air discharged by other 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.
Installation base shall be strong enough to support the units and prevent vibration.
To avoid installing units at dirty and salty place.
Do not install units at easy burning gas leakage place. Accumulated burning gas leakage
may result in an explosion.
Do not install units to the place where the units are inclined to be damaged by typhoon and
strong wind. If possible, install rainproof, snow-shield, and lightproof equipment.
Space for installation of outdoor units
One single outdoor unit can be installed in one place, multiple outdoors can be installed in one
big place in order. For details, see the following:
Space for single outdoor unit
1,838.4074
1,395.5372
FRONT
Ľ 45¡ª
Ľ
3
0
0
m
m
Ľ
1000mm
FRONT
BACK
AIR OUTLET GUIDE
Ľ 450mm
Ľ 450mm
Ľ100mm+h 4
Ľ450mm+h3
Ľ
4
5
0
mm
Ľ450mm+h2
Ľ450mm+h1
Ľ
4
5
0
m
m
Ľ
4
5
0
mm
h
2
h
1
h
4
h
3
FRONT
Ľ
4
5
0
m
m
FRONT
FRONT
FRONT
Ľ 450mm
Ľ900mm
Ľ 900mm
Ľ450mm
FRONT
BACK
Ľ
4
5
0
m
m
FRONT
BACK
Ľ
4
5
0
m
m
Space for more than one units
-68-
Design & installation Guide For McQuay MDS Multi System
Handling outdoor units
Please refer to the followings to move units; To use 4 supporting points to move units instead
of 3 points, to avoid unstable move and units drop off.
FRONT
FRONT
BACK
600mm
BACK
FRONT
FRONT
BACK
BACK
Ľ900mm
Ľ450mm
FRONT
FRONT
BACK
BACK
FRONT
FRONT
BACK
BACK
Ľ900mm
Ľ900mm
Ľ450mm
Suspension ropes
<40
Protective pads
(2 ropes)
ă
>8
m
>8m
<40
ă
Notes:
Be careful in the moving of outdoor units.
Do not lift or move units with the package rope, as it is easy to
break and bring danger.
Do not directly touch the fins of units to avoid hurt of hand.
Do keep the plastic bag from the child.
Outdoor unit installation
To use concrete or supporter to build a base. Fully consider the floor strength, drainage
(discharge from the unit in operation), and pipes and cables layout. If the strength
cannot satisfy the 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.
Properly install the unit to defend against strong wind and earthquake better.
To take some shock resistance measures (such as using cushion and bumper bracket)
to avoid vibration passing to the installation part. The bottom panel and wall may cause
vibration and noise, depending on the installation condition.
To place the edge to the right position. Otherwise, the unstable unit may cause the
installation foot bent. Any improper installation may cause the unit falling off and injuring
people.
Warning:
The unit must be installed to the place which is strong enough to bear the unit weight
and vibration.
For lower pipes and cables layout, make sure the base not block the hole at the bottom.
When laying out the lower pipes, the basic height shall not be less 100 mm to ensure
the pipe to get through the unit bottom.
-69-
Design & installation Guide For McQuay MDS Multi System
Installation of the Combined Outdoor Units (Suitable for Model of MDS260/280/300)
Two outdoor units can be grouped as one outdoor unit, to connect with indoor units. The
installation of combined units is more complicated than that of the single outdoor unit; please
read the below notes carefully before installation, and strictly follow the installation
instructions.
Select the position of the installation for outdoor unit
Select one unit as the master unit, the other one as the slave unit; and these two units shall
be positioned in the same level side by side.
Master unit and slave unit shall be installed in the same level.
The distance between the master and slave unit shall be more than 10mm.
Connecting pipe of the outdoor units
Accessory copper parts are packed with the outdoor units; pipe connection includes
gas, liquid and balance piping connection between the master and slave units. All pipes
shall be with insulation material and avoid any damage of this insulation material.
Gas and liquid pipe connection
Gas and liquid pipe connection with the units, please refer to the concerned chapter of
installation of refrigeration pipe .
Gas and liquid pipe shall be connected paralleled, shown as below. The dimensions of
the straight pipe connected to the Tri-joint must meet the requirements below.
Position to connect pipe position
(Remove the panel before
connecting pipe)
Master and slave units must be
installed in the same level
B
Elbow
C
D
B
al
a
nce pi
p
e
Liqu
id pi
p
e
G
as pipe
To units
To units
A
C
o
nne
ct
p
ipe to
indo
or un
its
A >10mm
B >200mm
C >500mm
D>100mm
Tri-joint
For 28.6mm gas pipe,
directly connect to Tri-joint;
For 34.9mm gas pipe, add a
reducer and a transition pipe
28.6mm a transiton pipe
(only for 34.9mm gas pipe)
-70-
Design & installation Guide For McQuay MDS Multi System
Balance pipe connection
Balance pipe must be installed. Balance pipe shall be connected through the hole of side
panel or base panel or the position with the other outdoor unit.
Balance pipe shall be installed horizontally and orderly, and shall be lower than the access
valve for balance pipe.
Protect the balance pipe carefully and avoid touching any other parts, especially need to
keep the pipe from touching the wall of hole.
Balance pipe connection with the unit is shown in below drawing.
Insulation and protection for connceting pipe
All connceting pipe 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.
Balance pipe
Screw
joint
Access valve for
balance pipe( 9.52)
Base panel hole
Side panel hole
-71-
Design & installation Guide For McQuay MDS Multi System
4.2 Indoor Unit Installation
To choose the position of installation
Improper installation position will affect the cooling and heating performance, or even cause
malfunction or accident. Follow the below instructions:
Ensure air flow everywhere of room.
No barrier for air flow.
Ensure enough maintenance space for installation. Otherwise, it will cause difficulties to
maintain the unit in future.
Wall or ceiling shall be strong enough to support indoor units. Otherwise, it may cause the
unit falling off.
Do not expose to sunshine.
Do not install units to the place where steam or oil smoke exists.
Do not install units to the place where burning gas leakage may happen.
Do not install around the high frequency equipment (such as high frequency electric welding
machine).
Do not install units in the place where acid liquid exists.
Do not install units in the place usually using sulfide or other sprayer.
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.
10mm
drain direction
Notes:
a. Ensure piping and air duct working are most efficent 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 the
section technical parameters of Usage Instruction. Use the torque spanner to install the pipe to avoid
damaging the copper tube and its joint.
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, and do not open valves, connector, copper cap and cushion before installation.
To install refrigerant pipe, all models of this series product should be connected with a E-EXV box out of the
machine, as shown in below figure.
Note: The E-EXV box contains electronic 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 box and the indoor unit could not
exceed the length-limit of the electric expansion valve cable, as shown in the figure below.
There are some manners to install the E-EXV (the mounting must be fixed and safe, and the direction must be
vertical).
indoor
unit
E-EXV box
liquid pipe
gas pipe
screw joing
Pole
Nut
Spring pad
Hook screw hole
Washer
Nut
Washer
Hook
Screw
Screw
Screw setting on indoor unit
Suspending by steeves
-72-
Design & installation Guide For McQuay MDS Multi System
Duct Working Installation
Air supply duct working installation
Two types of air supply duct working: 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 depending on ceiling height.
Insulation of duct working
Both air supply and return duct working shall be equipped insulation material with aluminum foil.
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:
Ľ0.5m
ļ
3
.
0
m
Ľ
1.0m
obstacle
floor
Ľ0.5m
Ľ0.5
m
ļ
0
.
3
m
girder
indoor unit
Installation instruction
a. To keep indoor units from the source of heat and vapor (do not install in the entrance).
b. To measure the position of fixing and drill hole in the ceiling and fix the units tightly.
c. The paper template may change with the temperature and humidity, so please measure the
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 template with the indoor unit.
f. Ensure the distance between the hang poles is 620.4mm
790.0mm.
g. To use screw to fix the indoor units tightly.
Install MCK-T series indoor unit
Notes:
a. Ensure the space for installation.
b. Ensure no barrier, and good ventilation is a must.
Please refer to the below fixed:
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 unneces-
sary vibration and reduce the noise. The unit must be installed horizontally, and ensure enough
ceiling height and space for installation.
electrical heater
joint
return airindoor unit
‰ł
¸fi
‡
¸fi
heating coil
joint
indoor unit
return air
-73-
Design & installation Guide For McQuay MDS Multi System
Good setting
Cool air
flow
Cool air
flow
Indoor unit
Ceiling
Ceiling
Bad setting
j. To cut the same shape of paper template 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 mm host to connect outside part of drainage piping.
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 water to piping from the host connector to test the leakage.
r. After testing, to connect the other end of 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 connecting pipe shown in the front pane.)
To remove the paper template.
To remove the air filter and grill of front panel.
To use 4 screw bolts 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.
(Drill hole in ceiling) 890.0mm
(Drill hole in ceiling) 890.0mm
620.4
790.0
(Machine dimension) 820mm
(Machine dimension) 820mm
Steeve
Nut
Nut
Washer
Washer
Indoor unit
Ceiling
35mm
Good setting
Drain pipe
clamp
Indoor unit
Bad setting
Flexible pipe
Drain & leakage test
Drain pipe
Fill water
h. To adjust distance between the bottom panel and ceiling to 35.0mm.
i. To check whether the installation is horizontal, and indoor units are fixed tightly without dropping
off and vibration.
Open
Screw bolt/pad
Connected to
the front panel
Indicator connecting wire
Connecting wire for swing motor
Control box
-74-
Design & installation Guide For McQuay MDS Multi System
Notes:
Do not close all air outlets of indoor unit in the using of 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 or equal to 20%.
Air tightness of outlet of supply air
Total 4 air outlets can be sealed by insulation material but more than 2 air outlets 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 about 10mm but not touch the air grill;
there is no need to extend insulation material far 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 filter with the front panel.
The air inlet grill can be installed in any direction, depending on the
ceiling design.
To fix the grill and consider the service friendly to open the grill.
Installation of drainage
a. Slope is required as 1/100, and try to drain in a positive slope.
b. To use suspending bolt to fix the long drainage piping.
c. After installation, to run the leakage test is necessary to ensure it works.
d. Only in cooling mode, there is a need to detect the status of drainage.
Return Air and Supply Air Direction
return air
supply air supply air
supply air
supply air
air outlet fresh air inlet
¡Ø
Drawings for piping connector and its dimension (unit: mm):
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. If the indoor unit is
installed to the place with a barrier (such as a head lamp) or a small space, the connecting pipe
can improve air supply to two rooms at one time.
-75-
Design & installation Guide For McQuay MDS Multi System
Installation of MDB-T series indoor unit
To mount the MDS050~060T in ceiling. As the air outlet flange is close to the unit bottom, when
the unit is mounted in ceiling, the pipe can be laid out easier, effectively reducing the requirement
for room height. After the installation, only the air inlet/outlet is exposed, as shown below.
duct
return air
ceiling
height
static pressure
box
duct discharge
air
indoor unit
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 pipe 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, and try to drain in a positive slope.
b. To use suspending bolt to fix the long drainage piping.
c. After installation, to run the leakage test is necessary to ensure it works.
d. Only in cooling mode, there is a need to detect the status of drainage.
-76-
Design & installation Guide For McQuay MDS Multi System
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:
return air grill
frame
suspending panel
side panel
ceiling mounting
floor standing mounting
10mm
10mm
Ľ300mm
ļ250mm
Ľ
5
0
0
m
m
ceiling mounting
Ľ400mm
PULL PULL PULL PULL
Ľ1000mm
floor standing mounting
300
300
1
66
mm
10mm
ceiling
machine top panel
10m
m
10mm
10.0
621
Horizontal ceiling mounted
1. To remove the return air grill, frame, side panel and suspending panel as shown as below:
If the indoor unit is semi-concealed mounted in ceiling, reserve holes in ceiling to ensure
enough space for mounting and maintenance, as shown below:
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Design & installation Guide For McQuay MDS Multi System
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: return air grill
indoor
unit
E-EXV box
liquid pipe
gas pipe
flare joint
Installation mode 1: Rod mounting
Pole
Nut
Spring pad
Hook screw hole
Washer
Nut
Washer
Hook
Installation mode 2: Mounting on the wall
Fix with screw
Wall
(come from the top panel)
Refrigerant pipe & drainage
Wall
Refrigerant pipe & drainage
(come from the rear panel)
Wall
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 required as 1/100, and try to drain in a positive slope.
b. To use suspending bolt to fix the long drainage piping.
c. After installation, to run the leakage test is necessary to ensure it works.
d. Only in cooling mode, there is a need to detect the status of drainage.
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:
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 electronic 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 box and the indoor 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 must be vertical).
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Design & installation Guide For McQuay MDS Multi System
4.3 Refrigerant Piping Design and Installation
4.3.1 Refrigerant Piping Design ( Including Selection of Refnet Joint )
Capacity combination
The indoor units & outdoor units should have a relationship as follows:
Refrigerant piping limit
Note: the equivalent length is calculated as follows:
One refnet joint equals to 0.5m, one distributor kit equals to 1.0m.
The above table is based on the 8/10HP unit.
50%
indoor units' cap
outdoor units' cap
130%
The max. equivalent length L
The max. equivalent length L from the first refnet joint to the indoor unit L
Refnet of gas side
Refnet of liquid side
Refnet of gas side
Refnet of liquid side
D2D4D2D4
D2
D4D2D4D2D4D2D4D2D4
D2
D4
D1
D1
D1
D3
D3
D3
L2
D3
D3
L1
D1
L3
L4
L6
D1 D1 D1
D2
D4
dabc
e
f
g
h
i
L5
Outdoor unit
Liquid valve
Gas valve
Throttle unit
Indoor unit
The height between outdoor unit and indoor unit H1
Height between indoor
unit and outdoor unit H2
Note:We strongly recommend that the capacity modulation equals to 100%.
Allowable value piping section
Actual length
250m
L1+L2+ L
i
Piping
Max. length(m)
Actual length 125m
L1+L2+ L
i
Equivalent length 150m
The length from the first branch to the remotest unit L(m) 40m L2+L3+ L
i
Height between indoor
Outdoor unit is above 50m -
Height
unit and outdoor unit
Indoor unit is above 40m -
Height between indoor unit and outdoor unit 15m -
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Design & installation Guide For McQuay MDS Multi System
Equivalent length
Equivalent length = actual pipe length + number of elbows X equivalent length of each
elbow + number of oil traps X equivalent length of each oil trap.
Item
elbow(m) oil trap(m)
Diameter
9.52 0.18 1.3
12.70 0.20 1.5
15.88 0.25 2.0
19.02 0.35 2.4
22.02 0.40 3.0
25.40 0.45 3.4
28.58 0.50 3.7
31.80-41.30 0.55 4.0
For example: when 10HP outdoor unit's actual length is 80m, the piping diameter is 25.4mm,
ten elbows and three oil traps are used, then the equivalent length is calculated as follows:
Equivalent length = 80+0.45x10+3.4x3=94.7(m).
Application of equivalent length
When the equivalent length is more than 90% of the actually allowable maximum piping length
(more than 63m in 6HP, 90m in 8/10HP), the gas pipe diameter of the main piping (piping from
the outdoor unit to the first branch) should be expanded to a higher level. For instance, when
the equivalent length of 10HP outdoor unit is more than 100m, the gas pipe diameter is
changed from 28.6mm to 31.8mm.
When the diameter of gas pipes is expanded to a higher level, the equivalent length should
be recalculated as follows:
Expanded equivalent length = equivalent length of main piping X 0.5 + equivalent length of the branch pipe
For example: when the actual length of 10HP outdoor unit is 80m, branch pipe length is 20m, the
diameter of the main gas pipe is 25.4mm, ten elbows and three oil traps are used (elbows and traps
are used only in main piping).
Equivalent length = 80+0.45X10+3.4X3=94.7(m)
As the equivalent length is more than 90m, the diameter of gas pipe in the main piping is
expanded to a higher level.
Expanded equivalent length =(60+0.45X10+3.4X3) X0.5+20=59.1(m).
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Design & installation Guide For McQuay MDS Multi System
Only connected by the refnet joint
Outdoor unit
Distributor kit
Indoor unit
controller
Connection of refnet joint and distributor kit
Refnet joint
Outdoor unit
Indoor unit
controller
Only connected by the distributor kit
controller
Refnet joint
Outdoor unit
Distributor kit
Connected by the refnet joint and the distributor kit
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Design & installation Guide For McQuay MDS Multi System
Refrigerant Piping Installation:
Refrigerant piping should use the appointed diameter pipe;
Refnet joint must be installed horizontally or vertically.
(Horizontal line)
(Horizontal line)
B viewer
A viewer
OR
Distributor kit must be installed horizontally.
To the indoor unit
Liquid distributor kit
To the indoor unit
Gas distributor kit
Horizontal line
B viewer
B viewer
(gas side)
(liquid side)
Distributor kit should be connected to indoor unit directly, it is not allowed to connected to the
distributor kit or refnet joint.
Controller
Indoor unit
Indoor unit
Distributor kit
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Design & installation Guide For McQuay MDS Multi System
4.3.2 Refrigerant Piping Assembly Process
Three principle of the refrigerant piping assembly
Processing method
Dry Piping assembly air blow dry
Clean
Nitrogen charging
air blow
Piping assembly
Use the right material such as copper and welding rod
No air leakage Abide by the welding process
Abide by the flare fitting process
air leakage test
Dry Clean No air leakage
no moisture no dust No refrigerant leakage
Three principle of the refrigerant pipe
The EXV must be installed vertically
The throttle is installed vertically
EXV
To indoor unit
To outdoor unit
Sequence
install the indoor unit cut the piping required install the pipe nitrogen charging
welding blow air leakage test dry
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Design & installation Guide For McQuay MDS Multi System
4.3.3 Exchange Way of Nitrogen Gas (When Welding Copper Tube)
Suppose no nitrogen gas is injected into refrigerant pipe when welding, the oxide air bubble will
come into being in the internal surface of tube. This will result in some damage to the system. In
order to avoid these, nitrogen gas should be injected into refrigerant pipe when welding, this
process is called nitrogen gas exchange method. This is the standard operation process of
welding.
Note:
The gas must be Nitrogen.
Pressure adjustor must be used.
Pressure adjustor
Copper
unit's connecting pipe
Nitrogen bottle
High pressure pipe
Non-hermetic valve
Binding belt welding area
Pipe
Pressure adjustor
Nitrogen bottle
Pipe
Outdoor unit
Non-hermetic valve
Moisture
Dust
Air
leakage
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Design & installation Guide For McQuay MDS Multi System
Pipe
inlet sealed
Outdoor Indoor
Spare pipe
needs to be sealed
4.3.4 Transportation and Conservation of Copper Tube
When transport the connecting pipe, please be careful to keep it in shape. Copper cap should
be used to prevent the dirt and water from entering it. When store it, the side of the connecting
pipe should be sealed as follows:
Liquid pipe
Liquid pipe
Gas pipe
Gas pipe
Outdoor unit
The connecting port is not connected,
and the connecting port of the indoor
unit is covered with adhesive tape
Blind plug(copper)
Flare fitting
C
o
Open inlet
Copper pipe
PVC belt
Nip it to flat
welding area
Return to
starting port
Rebound the belt
more than twice
Copper pipe
welding
Be careful when there are some operation as follows:
Put the copper pipe through a hole (The dirt is easy to enter it).
The copper pipe is extended to outside door (rainwater is easy to enter it, especially
when copper tube is vertical outside door)
4.3.5 Blow of refrigerant pipe
Using pressurized air to blow pipe is a kind of way to clean the pipe.
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Design & installation Guide For McQuay MDS Multi System
Steps:
Put the pressure adjustor on the nitrogen bottle
Connect the pressure adjustor with the liquid pipe of the outdoor unit
Seal any other connecting port,
Open the valve of the nitrogen and adjust it which the pressure is 5kg/cm2.
Check to see if the nitrogen go through the liquid pipe of point A.
Air blow
Hold a insulation material in your hand and try to seal the side of the copper pipe.
When the pressure is too strong to hold, release the insulation material quickly.
Seal the port of the copper pipe with the insulation material and put a piece of cloth near it,
when you feel that there are some moisture in it, it is time to dry it. And the following steps
are as follows:
Blow the copper pipe with nitrogen,
Process vacuum dry.
Close the valve of gitrogen bottle;
Repeat the above operation of unit B;
When the operation on the liquid pipe is finished, please do the same thing on the gas pipe.
Avoid wielding too often
Air pressure
Pressure adjustor
Insulation material Wood
Nitrogen
Primary side
Main valve
5kg/cm
2
5kg/cm
2
Secondary side
4.3.6 Selection of Refrigerant Pipe Material
Refrigerant pipe
Use the long straight copper pipe to reduce the welding times,
All the pipe must comply with the JIS requirement such as size, material and thickness.
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Design & installation Guide For McQuay MDS Multi System
4.3.7 Process Sequence of Air Leakage Test
Main points of testing
Please test as follows:
The Pressure charging must be tested both in liquid pipe and gas pipe.
First step, keep 3.0kg/cm2 pressure gas for more than 3 minutes---may be can find
big gap;
Second step, keep 15.0kg/cm2 pressure gas for more than 3 minutes---may be can
find big gap;
Third step, keep 28.0kg/cm2 pressure gas for more than 24 hours.
Notes: Keep the 28.0kg/cm2 pressure gas must more than 24 hours.
The pressure can not be more than 28.0kg/cm2!
Check the pressure decrease or not
If the pressure remain the same, then it is OK;
If the pressure decrease, then we should find out the leak gap.
If the ambient temperature when pressure is charged is different from the temperature
when observing, the pressure need to be modified as follows:
Modified value = (temperature when pressure is charged- temperature when
observing)x 0.1; e.g.: when pressure is charged to 28.0kg/cm
2
and the ambient
temperature is 25 ; after 24 hours, the pressure is 27.5kg/cm2 and the tempera-
ture is 20 , then you can have a conclusion that it is OK.
24 hours
First step
Pass
Work flow
Second step
Pass
15kg/cm2 x
3min.
3kg/cm2 x
3min.
30kg/cm
2
28kg/cm
2
3kg/cm
2
0kg/cm
2
15kg/cm2
Third step
3min. 3min.
Pressure
24 hours later, if the
pressure remains to
28kg/cm
2
, then pass
Pass
No
yes
Pressure
charging
Pass
check and
maintain it
refrigerant piping
assembly finished
is the pressure
released?
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Design & installation Guide For McQuay MDS Multi System
4.3.8 Air Leak Gap Checking
Test 1 (when the pressure reduces)
Hearing use your ear to find it out.
Touching use your hand to find it out.
Soap water use soap water to find it out.
Test 2 (when step 1 can not find out , then the following should be adopted)
Reduce nitrogen pressure to 3.0kg/cm2;
Charge the nitrogen with R22 to 5.0kg/cm2;
Use haloid lamp, alkyl detector or electric controller to check;
If still can not find the air leak gap, then the pressure should be charged to 28.0kg/cm2 and
check it again;
(The pressure can not be more than 28.0kg/cm
2
).
Notes: If the pipe is too long, it should be divided to sections to test as follows:
Indoor side
Indoor side + vertical pipes
Indoor side + vertical pipes + outdoor piping assembly
ABCD
NO.1 NO.2
Outdoor unit
Valve
Indoor unit
Vacuum pump
Refrigerant
Gauge
Nitrogen bottle
4.3.9 Copper Pipe Insulation
Material
All the insulation material should be strong enough to insulate the pipe.
For example, polyethylene is a good insulation material.
key points
Some areas such as welding area, enlarged port area and flange area can be insulated only after
the air leak test. Pay attention to the unit model and the running condition, for some gas pipe and
liquid pipe are all needed to be insulated.
pipe insulation
Refrigerant piping
assembly
pipe insulation
air leak test
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Design & installation Guide For McQuay MDS Multi System
Control
cable
Control
cable
Control cable
Copper pipe
Heat preservation
Metal support
Camber pad
Surface
binding
Surface
binding
Surface binding
Moisture preservation support
Connecting
port is not
heat-insulated
Heat
preservation
Heat
preservation
Heat
preservation
Heat
preservation
Only the gas pip e is heat-
insulated
The gas and liquid pipe are heatinsulated
Liquid pipe
Liquid pipe
Gas pipe
Gas pipe
Liquid
pipe
Gas
pipe
The connecting port should
be heat-insulated completely
4.3.10 Ball Valve Operation
Ball valve operation procedures
Make sure the pipes are connected and the valves are
operated correctly. Please install and operate the valves
as follows:
Gas side ball valve operation
1) Remove the connection pipe with flange: Remove the connection pipe with flange from the
gas side ball valve and braze it to the outside of
the unit.
2) Stick the sealing material: When removing the
connection pipe and flange, remove the sealing
material on the ball valve label and stick it on the
flange of the ball valve to prevent dusts into the
ball valve.
3) Replace the hollow gasket: Before delivery, seal the refrigerant circulation loop with
a round solid sealing plate to avoid gas leakage between flanges. In such status,
the system cannot run. So, please replace with the hollow gasket on the ball valve.
Before installing the hollow gasket, clean the flange surface and the sealing plate.
4) Fix the connection pipe welded with gas pipe, hollow gasket and gas ball valve with
screws.
Connection of the liquid side stop valve: Expand the flare fitting of the copper pipe.
Then, connect it with the threaded stop valve.
After pumping vacuum and fill refrigerant, make sure the valve is fully open. If the
system runs when the valve is closed, the unit pressure will be abnormal, damaging
the compressor and four-way valve.
Calculate the refrigerant amount to be added with the formula (refer to Section 9.3),
and fill the amount through the access opening when the pipe connection work is
complete.
After the work is finished, firmly fix the access opening and cap to avoid gas leakage.
O
S
In case the environment is hot and damp, increase the recommended thickness (1 inch for
the main pipe, and half inch for the refnet joint) in the table above.
For the cooling only unit, if it is predicted that the system might run in the ambient
temperature of less than 10
degrees Celsius, the liquid pipe should also be insulated.
The thickness of insulation materials depends on the pipe size.
Pipe size Thickness of the insulation material
6.4mm~25.4mm 10mm or more
28.6mm~38.1mm 15mm or more
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Design & installation Guide For McQuay MDS Multi System
Outer diameter size
Unit: mm
Outer diameter size
Outer diameter
Outer diameter
Metric system British measurement
6.35 1/4 9.0
9.52 3/8 13.0
12.7 1/2 16.2
15.88 5/8 19.4
19.05 3/4 23.3
The following table shows the dimension of the nut of the flare fitting nut. Unit: mm
When connecting the liquid pipe and liquid stop valve, align the center of the flare fitting of the liquid pipe
to that of the stop valve, and then tighten with a moment wrench. Whether tightened with the wrench
depends on the setting of the wrench range and the tightening angle. The following table shows the
external pipe diameter, the corresponding tightening moment and the tightening angle.
Outer diameter (mm) Tightening moment (N.m) Tightening angle(o)
6.35 14 18 60 90
9.52 35 42 60 90
12.7 50 57.5 30 60
15.88 75 80 30 60
19.05 100 140 20 35
The following table shows the dimension of the copper flare fitting.
A
osos
B
C
D
M
K
L
F
G
EE
H
Ball valve (liquid side)
Ball valve (gas side)
A Valve handle
(Before pipe connection, vacuum pumping and additional refriger-
ant filling for delivery, make sure this valve is closed completely.
After the above operations, please fully open it.)
B Stop pin (prevent the valve handle from turning over 90 degrees)
C Sealing plate (annex)
D Connection pipe (annex)
Install the pipe firmly to the valve flange with the sealing plate to
avoid gas leakage.
E Open (slow operation)
F Cap and copper spacer
Remove the cap and operate the handle. After the operation,
reinstall the cap. The moment to tighten the valve handle cap is 23
Nm to 72 Nm.
G Access opening
Pump vacuum for the refrigerant pipe through this access opening,
and fill additional refrigerant on the site. Open and close the access
opening with a double-end wrench. After the operation, reinstall the
cap. The moment to tighten the access opening cap is 12 N m to 15 N m.
H Flare fitting
For the tightening moment, refer to the figure in next page. Loosen and screw up the screw with a double-end
wrench. Coat refrigerant oil on the contact surface of the flare fitting (Type R22 mineral oil is applicable).
K Field connection pipe
Braze to the connection pipe. (Please use non-oxidative brazing materials)
Outer diameter
Outer diameter
Metric system British measurement
6.35 1/4 17.0
9.52 3/8 22.0
12.7 1/2 24.0
15.88 5/8 27.0
19.05 3/4 36.0
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Design & installation Guide For McQuay MDS Multi System
Necessary vacuum
Absolute pressure
(mmHg)
Frozen point
Outdoor temperature range
0
-60
-160
-260
-360
-460
-560
-700
-710
-720
-730
-740
-755
-760
-20 -10 0 10 20 30 40 50 60 70
5
10
20
30
40
50
60
200
300
400
500
600
700
760
0mmHg
Surface pressure (kg/cm
2
)
4.3.11 Refrigerant charging
Calculation of the additional amount of the refrigerant
Additional amount= (
15.88 liquid pipe length x180g/m) + ( 12.7 liquid length x120g/m)
+ (
9.52 liquid lengthx80g/m) + ( 6.35 liquid length x50g/m).
4.3.12 Vacuum Pumping
Vacuum drying of the refrigerant pipe
Vacuum drying
Vacuum drying is to dry the pipe by vaporizing the water (liquid) in the pipe with a vacuum pump
and discharge it. Under one atmospheric pressure, the water boiling point (steam temperature)
is 100 degrees Celsius. When the pressure in the pipe is reduced to nearly vacuum by using
a vacuum pump, the boiling point reduces. When the boiling point goes under the outdoor
temperature, the water in the pipe vaporizes.
Before vacuum drying, make sure you know how to select a vacuum pump and how to
maintain.
The refrigerant amount of fill of the outdoor unit before delivery (excluding the refrigerant to
be filled in the site pipe)
The additional amount of the refrigerant depends on the liquid pipe diameter and length (based
on the liquid pipe).
Diameter of the liquid pipe (mm) 6.35 9.52 12.7 15.88 19.05
Amount of the additional refrigerant (g/m) 50 80 120 180 290
Calculate the refrigerant amount according to the length of the liquid pipe
Add additional refrigerant
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Design & installation Guide For McQuay MDS Multi System
Selection of vacuum pump
When selecting a vacuum pump, please pay attention to the follows:
The range of vacuum must be up to -755 mmHg
The vacuum pump should have a large exhaust volume(more than 40 litres/min).
Water boiling point(c) Pressure(mmHg) Vacuity(mmHg)
40 55 -705
30 36 -724
26.7 25 -735
24.4 23 -737
22.2 20 -740
20.6 18 -742
17.8 15 -745
15.0 13 -747
11.7 10 -750
7.2 8 -752
05-755
Sequence of vacuum drying
According to the different ambient, vacuum drying has two ways:
Ordinary vacuum drying
Operating sequence:
Connect the pressure gauge with the liquid pipe and gas pipe, then run the vacuum pump
for more than 2 hours to reach the vacuity of -755 mmHg.
After pumping for 2 hours, if the pressure is higher than -755 mmHg, or there is some
moisture, then pump it for 1 more hour.
After 3 hours pumping, if the pressure is still higher than -755 mmHg, please check to see
if there are some air leak gap.
When the pressure is -755mmHg, stop pumping and wait for 1 hour to see if the pressure
change. If the pressure change, that means there are some air leak gaps or there is some
moisture in the pipe.
Type Max. exhaust volume
Application
Vacuum drying Air discharge
Vacuum pump with lubricant
0.02mmHg
Suitable Suitable
100L/min
10mmHg
Unsuitable Suitable
40L/min
Vacuum pump without lubricant
0.02mmHg
Unsuitable Suitable
50L/min
Type of vacuum pump and the vacuity
Notes
Vacuum should be held both in the liquid pipe and the gas pipe at the same time.
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Design & installation Guide For McQuay MDS Multi System
Special vacuum drying
This vacuum drying way is used when there are some moisture in the copper pipe.
Operating sequence:
Vacuum drying: pumping the system for 2 hours;
Nitrogen charging: Charge the nitrogen to the pressure of 0.5kg/cm2;
As Nitrogen is a dried gas, so it can dry the system; but if the moisture is too much, maybe it can
not dry the system thoroughly. So when install the refrigerant piping, please be careful enough
to prevent the water coming into the pipe or the condensated water.
Vacuum drying one more time: pumping the system for 1 hours;if the pressure is less than
-75 mmHg, then it is OK; if it can not reach -75 mmHg, then it should go back to item 2, then
item 3;
Stop vacuum pumping and wait for 1 hour;
Additional refrigerant charging;
Open the vale to charge.
Please note that the gas must be nitrogen, if oxygen is used by mistake, it can result in explosion
-760
-700
-600
-400
-200
+0.5
0
kg/cm
2
Special vacuum drying
Vacuum Increase pressure
Refrigerant charging
Vacuum drying
Vacuum drying
Vacuum pump
Vacuum damage
(Barometric pressure)
-755mmHg
-760
-700
-600
-400
-200
0
Vacuum pump
Ordinary vacuum drying
Vacuum rising pressure
Refrigerant charging
Total for 3 hours
Vacuum drying
kg/cm
2
(Barometric pressure)
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Design & installation Guide For McQuay MDS Multi System
4.4 Design, Processing and Installation of Condensated Drain Pipe
4.4.1 Design of Condensated Piping
Size selection of main pipe and vertical pipe of condensated water
Choose the pipe size according to the condensated water flow from the main pipe of indoor unit
and the following table; Suppose the condensated water flow of 1 HP is 2L/h, then the condensated
water flow of 3# 2HP and 2# 3HP is calculated as follows:
2
L/h x 2(HP) x 3(sets) +2L/h x 3(HP) x 2(sets) = 24L/h.
Note:
Suppose the moisture is 10% in the pipe.
After the header pipe, the pipe should be larger or equal to VP30.
1
/1
0
0
4HP
25
25
Air vent pipe
25
2HP
2HP
Condensate pipe
group of multiple units
30 or more
Pipe mouth facing downward
to prevent foreign matters
For example, The condensate pipe of one 2HP
and two 4HP indoor units are connected to a
pipe as shown on the right, and its water drain-
age capacity is:
4L/h + 8L/h 2=20L/h
So the horizontal vertical pipe diameter shall be
30 or more, and the diameter of the vertical
diameter shall not be less than that of the hori-
zontal vertical pipe.
Main horizontal pipe Vs condensated water flow rate
JIS
Polyethylene pipe allowable flow rate L/h
Remark
diameter mm slope 1/50 slope 1/100
VP20 20 39 27 unsuitable for the
VP25 25 70 50 header pipe
VP32 31 125 88
VP40 40 247 175 Suitable for the header pipe
VP50 51 473 334
Note:
The vertical pipe should be larger than VP30
Vertical pipe Vs condensated water flow rate
JIS Polyethylene pipe diameter mm allowable flow rate L/h Remark
VP20 20 220
unsuitable for
VP25 25 410
the header pipe
VP30 31 730
VP40 40 1 440
VP50 51 2 760
Suitable for the header pipe
VP65 67 5 710
VP75 77 8 280
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Design & installation Guide For McQuay MDS Multi System
4.4.2 Making and Mounting Condensate Pipes
4.4.3 Slope and Supporter of Condensate Pipe
The slope condensate pipe should be more than 1/100
The length of condensate pipe should be as short as possible to discharge the conden-
sate water (no air pocket on the way).
For a long condensate pipe, you may use a suspension bolt, to ensure the slope is 1/100
(the PVC pipe cannot be bent)
The space of the horizontal pipe support is as follows:
The length of horizontal pipe should be as short as possible.
4.4.4 Condensate Pipe Trap
When the unit can generate mins pressure at the
condensate water outlet of the unit, the water
trap should be installed (to prevent the stench
coming into the indoor units)
The water trap should be installed as shown
in the right diagram.
Each unit can have only one water trap.
The water trap installed should be easy to maintain.
20211,
Indoor unit
I
I
H:50m or more
Choke
Indoor unit
Choke
Indoor unit
Grade Nominal diameter Interval
Hard PVC pipe 25~40mm Less than 1.0m
Procedure:
connect the condensate pipe
Install the
indoor units
check for
water leakage
insulate the
pipe from heat
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Design & installation Guide For McQuay MDS Multi System
4.4.5 The Main Drainage Pipe of Multiple Indoor Units
The pipe should be mounted from the upstream, and the diameter of the downstream
connecting pipe should be as long as possible.
The pipe should be as short as possible and the number of the indoor units must be as small
as possible.
Condensate pipe group of multiple units
25
1
/1
0
0
4HP
2HP
25
30 or more
2HP
25
Pipe mouth facing downward
to prevent foreign matters
Air vent pipe
4.4.7 Key Points
The diameter of the condensate pipe should be more than or equal to that of the drainage pipe.
The condensate pipe should be insulated.
The lift pipe of the condensate pipe should be installed before the indoor unit. When the unit
is running, if there is water in the condenser collector, please check whether the condensate
pump is working properly.
All the connecting wiring should be solid (especially the PVC pipe).
4.4.6 Accessory Condensate Pipe (Hose)
If the condensate collector is made of polystyrene, it should use the hose. The condensate pipe
box can easily connect with the condensate pipe to prevent the condensate coil distorted
Indoor unit
Heat insulation part (binding)
Condensate
water collector
Metal clip
Auxiliary
condensate pipe
Indoor unit
Maximize the
pipe diameter
Heat insulating material
1:100 or greater slope
hanging interval
1.5-2m
Pole
Heat insulation
part (condensate pipe)
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Design & installation Guide For McQuay MDS Multi System
4.4.8 Installation of the Drainage Lift Pipe
If the water collecting header is installed, please refer to the following:
After connecting, the hose should not be
higher than the connecting port. This can
prevent the water from flowing backwards.
Do not give external force to one side of the unit,
and the drainage pipe should not be loose and it
should be fixed.
If the drainage pipe needs to be lifted up, it
should be less than 300mm. If it is more than
500mm, maybe it will result in the refrigerant
leakage.
Use the gradienter to check if the indoor unit
is parallel to the ceiling,
Ceiling
Air vent device
Spring hose
Ceiling
1ċ1.5m
After
500mm
200mm
After
300mm
Connecting pipe
Upper leaned
Ceiling
Supporting object
1ċ1.5m
The gradient is 1/100 or more
Ceiling
Drainage pipe clip
Water connecting pipe
Air vent port
100mm
or more
The gradient is
1/100 or more
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Design & installation Guide For McQuay MDS Multi System
Testing
CHAPTER
5
5.1 Hardware Diagram and Configuration
5.1.1 MDS Series Indoor Units
The indoor unit consists of a three-speed fan and an electronic expansion valve (electric heater and
swing function optional). The four temperature sensors respectively serve to measure the temperature
of the indoor, inlet coil, midlet coil and outlet coil. The MDS-A system can connect with a remove control
or remote receiver and, as a slave unit, communicates with outdoor units via RS485 interface. The DIP
switches on the controller determine the electric heater, power, unit model and address number.
MRS485 terminal resistor J2-1: ON/OFF indicate whether resistance is present or not.
Power supply
Temperature measurement
Communication port 1
Communication port 2
Memory 3
3-speed fan
Electronic expansion valve
indicator
Electric heater
Swing
SW1:DIP switch
for function setting
SW2: DIP switch for
indoor unit address setting
SW3: DIP switch
for model setting
Model 1 SW1.1 SW1.2 SW1.3 SW1.4 SW1.5 SW1.6
OFF: No
Electric heater 1 Electric heater 2 Pump Reserve Reserve Reserve
ON: Yes
Model 1 setting (SW1.1 SW1.6)
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Design & installation Guide For McQuay MDS Multi System
Address settings (SW2.1
___
SW2.6)
Unit address SW2.1 SW2.2 SW2.3 SW2.4 SW2.5 SW2.6
0 000000
1 000001
2 000010
3 000011
4 000100
5 000101
6 000110
7 000111
8 00100 0
9 001001
10 000101
11 0 0 1 0 1 1
12 001100
13 0 0 1 1 0 1
14 001110
15 001 111
16 0 1 0 0 0 0
17 0 1 0 0 0 1
18 010 010
19 010 011
20 010 100
21 010 101
22 010110
23 010 111
24 011000
25 0 1 1 0 0 1
26 011 010
27 011011
28 011 1 00
29 011 1 01
30 011110
31 0 1 1 1 1 1
32 1 0 0 0 0 0
33 1 0 0 0 0 1
34 1 0 0 0 1 0
35 1 0 0 0 1 1
36 1 0 0 1 0 0
37 1 0 0 1 0 1
38 1 0 0 1 1 0
39 1 0 0 1 1 1
40 1 0 1 0 0 0
41 1 0 1 0 0 1
42 1 0 1 0 1 0
43 101011
44 101100
45 1 0 1 1 0 1
46 1 0 1 1 1 0
47 10111 1
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Design & installation Guide For McQuay MDS Multi System
Medium
CNI connected
electronic expansion valve
K2
J2
J1
MCU
DIP switch
DIP switch
AC220N
Reserved
Constant-speed over current
Digital over current
Low pressure
High pressure
Digital pipe
Test ter minal
Burning mode
Normal mode
K1
AC220N
AC220L
Primary
transformer
Secondary
transformer
Power indicator
Internetworking
communication indicator
Indoor unit
communication indicator
Outlet temperature
Air discharge temperature
Ambient temperature
Return-air temperature
bottom temperature
Inlet temperature
Midlet temperature
Solenoid
valv
e
Four-way
valve
Digital High Low
Reserved
Constant
speed
Networking
communication port
Connecting
to indoor-
unit commu-
nication port
5.1.2 MDS-A Series Outdoor Units
Model 2 setting
SW3.5 SW3.8
Power setting SW3.1 SW3.4
Model 2 SW3.5 SW3.6 SW3.7 SW3.8
MCC 0 0 0 0
MCK 0 0 0 1
MCM 0 0 1 0
MWM 0 0 1 1
MDB 0 1 0 0
MDBX 0 1 0 1
Reserve
Power SW3.1 SW3.2 SW3.3 SW3.4
0.8HP 0 0 0 0
1.0HP 0 0 0 1
1.5HP 0 0 1 0
1.8HP 0 0 1 1
2.0HP 0 1 0 0
2.5HP 0 1 0 1
3.0HP 0 1 1 0
4.0HP 0 1 1 1
5.0HP 1 0 0 0
6.0HP 1 0 0 1
7.0HP 1 0 1 0
8.0HP 1 0 1 1
9.0HP 1 1 0 0
10.0HP 1 1 0 1
11.0HP 1 1 1 0
12.0HP 1 1 1 1
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Design & installation Guide For McQuay MDS Multi System
Description of controller hardware
Input port:
The
system contains 5 test ports designed for high/low pressure test, digital compressor
overload,
constant speed compressor overload 1 and constant speed compressor overload 2
(used when 3 compressors are available)
Output port:
The
system contains 9 output control ports including PWM valve, 4-way valve, digital compressor/
constant-speed
compressor main power supply, high/medium/low wind, SI (reserved as the main
power
supply for the second constant-speed compressor of the 3 compressor systems, if
applicable) and riving port for electronic expansion valve.
Sensor test port
The
system has 7 temperature test ports designed to test the temperature of the digital
compressor
exhaust, ambient temperature, return-air temperature, the bottom temperature of
compressor,
inlet temperature, midlet temperature and outlet temperature (Note: The flow
direction
of the refrigerant inside the coils when the system is running in cooling mode determines
the inflow and outflow direction described in this document).
Communication port:
The system has two RS485 communication ports. One network with the indoor units and the other
is used for internetworking control.
K1 & K2 Setting :
1. When outdoor unit is off condition (but control energised),
A: Press K1 for five seconds to enter commissioning mode. Expansion valve of outdoor unit will
fully open, and Digital Display Device ( hereinafter DDD ) will show the step of expansion
valve open. Indoor unit will receive a signal to fully open the expansion valve of indoor unit.
This function is for vacuuming use only. Off the power to quit commissioning mode and re-
energise:
B: Press K2 for five seconds to enter parameter setting mode, DDD will display " - - - - " Enter
the password 0755, the following parameter can be adjusted:
a: Number of indoor units
b: Start inspection temp for defrosting (Temp range : -3 ~ 3°C Default Value : 0 degC)
c: Defrosting temp (Temp range : -7~ 0°C Default Value : -3 degC)
d: Complete defrosting temp (Temp range : 5 ~ 25°C Default Value : 13 degC)
e: Defrosting interval (range : 20 ~ 90min Default Value : 45 minutes)
f: Defrosting running period (range : 5 ~ 25min Default Value : 10 minutes)
Within five seconds since DDD start to display " - - - - ", press K1 to enter proper digit ( 0~9),
then press K2 to confirm. After all four digit of password are correct, DDD will display the
number of indoor units, press the K1 to change the numbers, and then press K2 to confirm.
If do not want to change parameter, press K2 directly to skip into next parameter setting.
When all parameter display once, press K2 to quit the parameter setting. If interval between
two key press is longer than 5 seconds, it will automatically quit setting mode
2. Press K1 in short period, DDD display can change over for current data or setting data
3. Press K2 in short period, DDD will display history error code, which includes all outdoor unit
faults and communication faults between indoor and outdoor unit ( No indoor unit fault record ).
Maximum record is 16 errors, the oldest one will be deleted if exceed 16
Error Code Display Format
i.e. 02F2 02 is the second error, F2 is error code.
4. Press K1 and K2 at the same time for 5 seconds to delete all fault records and go back to
parameter display mode
5. Communication Error Code Format : CX . X is sequence no of indoor unit.
If second indoor unit has communication problem with outdoor unit, error code is C2
If all the indoor unit have communication problem with outdoor unit, error code is C-
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