MDS Application Manual PDF

Application Manual AM - MDS - 2006
Multi-Digital Scroll Units

Models: MDS030A(R) - MDS060A(R)
MDS080B(R) - MDS300B(R)
Engineered for ﬂexibility and performance.

TM
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 McQuays 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 ........................................................................................................ 50
2.8 Electric Data ................................................................................................................... 52
3. Selection
3.1 Load Calculation ............................................................................................................ 53
3.2 Selection of Indoor Units ................................................................................................ 55
3.3 Selection of Outdoor Units ............................................................................................. 56
3.4 Design of Air System ....................................................................................................... 59
3.5 Selection of Refnet Joint ................................................................................................ 64
3.6 Selection of E-EXV Box ................................................................................................. 67
4. Installation
4.1 Outdoor Unit Installation ................................................................................................ 68
4.2 Indoor Unit Installation ................................................................................................... 71
4.3 Refrigerant Piping Design and Installation ..................................................................... 79
4.4 Design, Processing and Installation of Condensated Drain Pipe ................................... 94
5. Testing
5.1 Hardware Diagram and Configuration ........................................................................... 98
5.2 Trial Run ...................................................................................................................... 105
6. Servicing and Maintenance
6.1 User Guide ................................................................................................................... 106
6.2 Servicing and Maintenance .......................................................................................... 107
7. Fault Code and Troubleshooting ........................................................... 111
Annexes ....................................................................................................... 113
Design & installation Guide For McQuay MDS Multi System
C H A P T E R
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 PWM vale
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 fixed scroll
(movable in axial direction)
loaded together with the optimal force.
This optimal force holding the 2 scrolls Orbiting scroll

together at all operating conditions en- (Rotatable in radial direction)
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
-4-
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.
==PWM valve power off ==PWM valve power on

==Valve close ==Valve open
==Fixed scroll move downwards ==Fixed scroll moves upwards
==Two scrolls gather together ==Two scrolls separate
==Loading ==Unloading
1.2.2 Sketch Map of Installation
Resident system Commerce system
-5-
1.2.3 Diagram of the Unit System
MDS030AMDS040AMDS050AMDS060A
Note: The MDS030A unit excludes the reservoir.
MDS030ARMDS040ARMDS050ARMDS060AR
Note: The MDS030AR unit excludes the reservoir.
-6-
MDS080BRMDS100BRMDS120BR
MDS150BR
-7-
MDS180BR
MDS200BRMDS220BRMDS240BR
-8-
MDS260BR
MDS280BRMDS300BR
-9-
1.3 Main Features
1.3.1 Wide Range and Stepless Capacity Modulation

Wide capacity modulation range10%-100%)
According to changing the ratio of loading timeand 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.
-10-
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).
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
NoteOT means the outdoor unit is above the indoor unit. IT means the outdoor unit is below the indoor unit.
-11-
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.
Traditional central air conditioning MDS system
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.
1.4 Nomenclature
Indoor unit: ceiling cassette Indoor unit: Ceiling exposed/floor standing unit
M CK 030 T - A M A M CM 050 T - A M A
McQuay Design alternation No.
Indoor unit: ceiling cassette Matching outdoor units: MDS series
Cooling capacity No. Power supply features: A:220V/50Hz
Design serial No. Design serial No.
Power supply features:220V/50Hz Cooling capacity No.
Matching outdoor units:MDS series Indoor unit: Ceiling exposed/floor standing unit
Design alternation No. McQuay
-12-
Indoor unit: ceiling concealed unit

M CC 050 T -R (B)/(D)- A M A
McQuay
Ceiling concealed indoor unit
Cooling capacity No.
Design serial No. Design alternation No.
Type of connecting pipe: Matching outdoor units:

R-right connecting pipe
MDS series
L-left connecting pipe
Air return mode: Power supply features:

B-rear air return plenum
D-lower air return plenum A:220V/50Hz
Omitted-no air return plenum
Hot water heater box

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

18-30 means it can be used in MCC018/020/025/030T
40-50 means it can be used in MCC040/050T
60 means it can be used in MCC060T
T means that unit can be used in MCCTseries
Hot water heater box
Electric heater box

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 MCC040050T
60 means it can be used in MCC060T
T means the unit can be used in MCCTseries

Heating capacity (kW)
Heating unit: P means the heating unit is PTC
Omitted means the heating unit is electric heating pipe
Electric heater box
Air-cooled cooling duct indoor unit
M DB 050 T - A M A
Design alternation No.
Matching outdoor units:MDS series
Power supply features: A:220V/50Hz
Design serial No.
Air-cooled cooling duct indoor unit
McQuay
-13-
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.
Indoor unit: Wall Mounted Indoor Units
McQuay
Outdoor unit: MDS unit

MDS 060 A R - F AA
Description of the unit

Power supply:
A:220V/50Hz F:380V/3N/50Hz
Heat pump (omitted if cooling only)
Design serial No.
McQuay multi digital scroll unit
MEX throttle box

MEX - 14 - 3 SA - A
Design serial No.

McQuay expansion box
Valve opening size No. Pipe mode
Pipe size
McQuay ________ MEX:Throttle box (one expansion valve)

Valve opening size No. ________ Nominal diameter value 10
Pipe size: ________ 2:1/4 inch
3:3/8 inch
4:1/2 inch
Pipe mode: ________ Flare fitting & nipple joint
Design serial No. ________ Primary design
1.5 Products Series

1.5.1 Outdoor Unit
Capacity range
Model
3HP 4HP 5HP 6HP 8HP 10HP 12HP 15HP 18HP 20HP 22HP 24HP 26HP 28HP 30HP
MDS-A

MDS-B

MDS-B
-14-
1.5.2 Indoor Products
Capacity range
Model
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
1.6 Performance Parameter

1.6.1 Ceiling Concealed
Indoor MCC MCC MCC MCC MCC MCC MCC MCC MCC MCC
Model
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
High m3/h 450 450 580 800 800 960 1200 1900 1900 2100
Air
flow Medium m3/h 370 370 470 650 650 780 950 1520 1520 1750
Low m3/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)
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)
Piping
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)
size
Drainage pipe inch R3/4
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.
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
Air flow(High/Medium/Low) m3/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
Notes:
-15-
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
High m3/h 520 600 650 700 1200 1300 1360 1650
Air flow Medium m3/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
Liquid pipe mm(in) 6.35(1/4) 9.52(3/8) 9.52(3/8)
Piping
Gas pipe mm(in) 9.52(3/8) 12.7(1/2) 15.8(5/8) 19.05(3/4)
Size
Drainage pipe mm 20.5
Notes:
1.6.4 Ceiling Exposed / floor Standing
Model Indoor unit MCM020T MCM030T MCM050T

Cooling capacity W 5800 7500 12500
Heating capacity W 5800 8000 13500
Air flow(High/Medium/Low) m3/h 1100/970/750 1300/1100/870 1850/1550/1200
Rated power input W 81 116 161
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
Notes:
1.6.5 Wall Mounted Indoor Units
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) m3/h 460/330/270 510/420/320 590/500/370 860/720/590 1100/790/680
Rated power input W 24 36 40 48 68
Power supply 220V~/50Hz
Dimension(WxDxH) mm 799x198x260 899x198x260 899x198x260 1062x222x304 1062x222x304
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
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)
PiPing
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
Notes:
-16-
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 840x408x900 1058x430x1044 1058x4230x1247
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) 9.52(3/8) 9.52(3/8) 9.52(3/8) 9.52(3/8)

Piping size
Gas pipe (mm/in) 15.88(5/8) 19.05(3/4) 19.05(3/4) 19.05(3/4)
Notes:
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
Liquid pipe Copper flare fitting & nipple joint
Type of connecting pipe
Gas pipe Copper flare fitting & nipple joint
Liquid pipe (mm/in) 9.52(3/8)
Piping size
Gas pipe (mm/in) 19.05(3/4)
Notes:
The specification parameters may change with the product improvement; Please take the parameters listed in the nameplate
of the unit as the reference parameter.
-17-
1.6.7 MDS-B Specification (Outdoor Unit)
MDS MDS MDS MDS MDS MDS MDS MDS MDS MDS MDS MDS
Model
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 kW - 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)
MDS MDS MDS MDS MDS MDS MDS MDS MDS MDS
Model
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)
Notes:
-18-
1.7 Operating Range
NoteThe table is gotten based on the equivalent length of 16m and the height is 0 m.
1.8 Refnet
Type
Y
1.8.1
Unitmm
Length(mm) Diameter (mm) Diameter (mm) Diameter (mm)

Refnet
E(outer I(outer N(outer
model A B C D F G H J K L M O P Q 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
-19-
Type: MDS-Y5
Unit: mm
1.8.2C
Type
Type: MDS-C1
Unit: mm
-20-
Type: MDS-C2/C3
Unit: mm
1.9 Outline of Indoor Units
050T
1.9.1 MCK010
Unit: mm
Model A B C D E F G H I J K L M
MCK010020T 820 875 548 820 278 250 28 930 930 642 622 555 555
MCK025050T 820 875 548 820 363 335 28 930 930 642 622 555 555
-21-
1.9.2 MDB050T
Unit: mm
1.9.3 MDB060T
Unit: mm
-22-
010
1.9.4 MCC008 015
018
020
025
030
040
050
060T
Unit: mm
Model A B C D E F G H I J No.of fans

MCC008T 690 722 1054 751 39 210 469 118 9 220 2
MCC010T 690 722 1054 751 39 210 469 118 9 220 2
MCC015T 690 722 1054 751 39 210 469 118 9 220 2
MCC018T 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
MCM030T
1.9.5 MCM020T MCM050T
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
-23-
1.9.6 Auxiliary Heating Coil
Unit: mm
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
1.9.7 Auxiliary Electric Heating Box
Unit: mm
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
-24-
1.10 Outline of Outdoor Units
1.10.1 MDS030A(R)
Unit: mm
MDS050A(R)
1.10.2 MDS040A(R) MDS060A(R)
Unit: mm
Model H1 H2
MDS040A(R) 1024 1044
MDS050A(R) 1024 1044
MDS060A(R) 1222 1242
-25-
MDS100B(R)
1.10.3 MDS080B(R) MDS120B(R)
MDS150B(R)
Unit: mm
Model A B
MDS080B(R) 900 990
MDS100B(R) 900 990
MDS120B(R) 900 990
MDS150B(R) 1200 1290
MDS200B(R)
1.10.4 MDS180B(R) MDS220B(R)
MDS240B(R)
Unit: mm
Model C D
MDS180B(R) 950 1990
MDS200B(R) 950 1990
MDS220B(R) 950 1990
MDS240B(R) 950 1990
1.10.5 MDS260/280/300B(R) are Combined Units,Made up by a Master Unit and a Slave Unit
Model Master unit+Slave unit D

MDS260B(R) MDS120B(R)+MDS150B(R)S 990+10+1290
-26-
C H A P T E R
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.
-27-
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 oF30 /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
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 oFcooling 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.
-28-
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: Pressfankey 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

PressCLKto 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,
CLK
the unit will exit from the real time setting and back to the normal status. If you press 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
CLKone 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 pressMode
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

Fan
In normal condition, when the 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
Autofunction.
Sleep
PressSleepkey, 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, pressHeaterkey and last for 5 seconds, you
will entermanual defrost mode
, andDefrost modeis 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.
-29-
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

PressSleep 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
PressON/OFFkeyboard, 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
Sleep
keyboard as the wire controller, But the keyboardFan, , Heaterdo 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.
-30-
2.3.3 Wire Control Panel
For three-speed unit For the cooling and For the cooling and For three speed For single speed
with wind wing heat pump unit with heat pump unit with unit with auxiliary unit with auxiliary
three-speed single-speed heater heater
2.3.4 Outline and Dimension
Unitmm
2.3.5 Installation Type
concealed installation
-31-
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
Introduction of the units
Indoor Icon
unit model Stop: Cooling Heating Dehumidity Air vent
MCC
MCK
MCM
MDB
Indoor icon instruction
Small icon
The line controller has There is malfunction in this

The timer function been locked, we can not
Introduction indoor unit, double-click the
has been started. use it to control the in-
door units at this time. icon to know the details.
-32-
Loop monitoring* Service monitoring*

Select and view the outdoor units system Display the current operation parameters
figure, operation parameters and the operation and history record curve of indoor/outdoor
parameters of all indoor units. unit in the system.
Note: Only the authorized maintenance personnel can operate on this interface
2.4.2 Unit Selection Software

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.
-33-
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.
-34-
2.6 Wiring Diagram

2.6.1 Wiring Diagram of Indoor Units
Model MCC008/010/015/018/020/025/030/040/050/060T
Model MCK010/015/018/020T
-35-
Model MCK025/030/040/050T
MCM020/030T
-36-
Model MCM050T
Model MDB050/060T
-37-
2.6.2 Wiring Diagram of Outdoor Units
Model MDS030A
Model MDS030AR
-38-
Model MDS040A
Model MDS040AR
-39-
Model MDS050A
Model MDS050AR(220V~/50Hz)
-40-
Model MDS050AR(380V/3N~/50Hz)
Model MDS060A
-41-
Model MDS060AR(220V~/50Hz)
Model MDS060AR(380V/3N~/50Hz)
-42-
Model MDS080/100/120B
Model MDS080/100/120BR
-43-
Model MDS150B
Model MDS150BR
-44-
Model MDS180B
Model MDS180BR
-45-
Model MDS200/220/240BR
-46-
Model MDS260B
380V/3N~/50Hz
SUBCOOLING OUTLET TEMPERATURE SENSOR TH11
DIGITAL COMPRESSOR DISCHARGE SENSOR TH1

SUBCOOLING INLET TEMPERATURE SENSOR TH9
SUBCOOLING TEMPERATURE SENSOR TH10
COIL MIDDLE TEMPERATURE SENSOR TH3
SUCTION TEMPERATURE SENSOR TH12

N
OUTDOOR AMBIENT SENSOR TH8

R S T
L
FU
T 71
S DB3A 81 LPT HPT
R N 1 2 3 1 2 3
BLACK
BLACK
WHITE
WHITE
RED
RED
YELLOW
YELLOW
BLUE
BLUE
RED
RED TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH12 TH11 TH10 TH9 TH8 TH4 TH2 TH1 LOW-U HI-U
V1+
BLACK
V1-
KM1 KM2 KM3 KM4 V2+ MDS-M
WHITE
V2-
30
Bpc Apc Bin Ain

OL1 OL2 OL3 OL4 31 TO SLAVE UNIT
FIX3-OL
FIX2-OL 32
OL1 12
FIX1-OL 33 TO CENTER CONTROL
YELLOW
YELLOW
21 22 23 24 25 26 13
OL2
BLUE
BLUE
RED
DIG-OL
RED
YELLOW
BROWN
BLACK
WHITE
BLUE
RED
LP
S1 S2 S3
L1 HP 15 OL3 16 OL4 17
HP
MDS-P
FANH
FANL
PMW
T2 T2
4WV
FIX2
FIX1
SV2
SV1
DIG
T1 T3 T1 T3 N
M M M
~ ~ ~ L
EXV1 EXV4
J1 J18
1 2 4 10 11
KM3 KM4 EXV4
FIXED COMPRESSOR DIGITAL COMPRESSOR FAN MOTOR 3 5
PMW KM4 KM3 KM1 KM2
SYMBOL DESCRIPTION SYMBOL DESCRIPTION
DB3A PHASE PROTECTOR FU FUSE
KM CONTACTOR SUBCOOLING
EXV4 OVERLOAD PROTECTOR SETTING:
ELECTRONIC EXPANSIVE VALVE
OL1 OL2 OL3 OL4
HP HIGH PREESURE SWITCH PMW SOLENOID VALVE
14.0A 14.0A 3.3A 1.8A
NOTE:
LPT LOW PREESURE SENSOR OL OVERLOAD PROTECTOR SWITCH SETTING: 1: FIELD INSTALLATION
S1.1 S1.2 S2.1 S2.2 S2.3 S3.1 S3.2 S3.3 S3.4 2:
HPT HIGH PREESURE SENSOR TR TRANSFORMER FACTORY WIRING
OFF ON ON OFF ON ON OFF OFF OFF 3: S1.3~S1.8 INNER UNIT QUANTITY SETTING, S2.1 MASTER OR SLAVE UNIT SETTING, S2.4~2.8 ADDRESS SETTING
Model MDS260BR(Master Unit)
-47-
Model MDS280/300B

380V/3N~/50Hz
DIGITAL COMPRESSOR DISCHARGE SENSOR TH1

COIL INLET TEMPERATURE SENSOR TH2


N
R S T
L
FU
T 71
S DB3A 81 LPT HPT
R N 1 2 3 1 2 3
BLACK
BLACK
WHITE
WHITE
RED
RED
YELLOW
BLUE
LOW-I HI-1 TH7 TH6 TH5 TH3 TH12 TH11 TH10 TH9 TH8 TH4 TH2 TH1 LOW-U HI-U
RED
TR
V1+
BLACK
V1-
KM1 KM2 KM3 KM4 KM5 WHITE
V2+ MDS-M
V2-
30
Bpc Apc Bin Ain

OL1 OL2 OL3 OL4 OL5 31 TO SLAVE UNIT
FIX3-OL
OL2 12 32
FIX2-OL
18 19 20
13
33 TO CENTER CONTROL
21 22 23 24 25 26
OL1
FIX1-OL MDS-P
OL3 14
YELLOW
YELLOW
YELLOW
DIG-OL
YELLOW
BROWN
BLACK
WHITE
BLUE
BLUE
BLUE
LP
BLUE
RED
RED
RED
S1 S2 S3
RED
L1 HP 15 OL4 16 OL5 17
HP
FANH
FANL
PMW
T2 T2 T2
4WV
FIX2
FIX1
SV2
SV1
DIG
T1 T3 T1 T3 T1 T3 N
M M M M
~ ~ ~ ~ L
EXV1 EXV4
J1 J18
G/Y
CRANKCASE CRANKCASE CRANKCASE

G/Y
G/Y
G/Y
HEATER HEATER HEATER 1 2 4 7 8 10 11
KM4 KM5 EXV4
3 5
FIXED COMPRESSOR1 FIXED COMPRESSOR2 DIGITAL COMPRESSOR FAN MOTOR PMW KM5 KM4 4WV KM2 KM1 KM3
DB3A PHASE PROTECTOR FU FUSE OVERLOAD PROTECTOR SETTING:

4WV 4 WAYS VALVE TR TRANSFORMER OL1 OL2 OL3 OL4 OL5
SUBCOOLING 14.0 14.0 14.0 3.3A 1.8A
KM CONTACTOR EXV4
ELECTRONIC EXPANSIVE VALVE NOTE:
SWITCH SETTING:
HP HIGH PREESURE SWITCH PMW SOLENOID VALVE FIELD INSTALLATION
MODEL S1.1 S1.2 S2.1 S2.2 S2.3 S3.1 S3.2 S3.3 S3.4 1:
AMDS280B OFF ON ON OFF ON ON OFF OFF ON
LPT LOW PREESURE SENSOR OL OVERLOAD PROTECTOR
AMDS300B OFF ON ON OFF ON ON OFF ON OFF
2: FACTORY WIRING
HPT HIGT PREESURE SENSOR AMDS320B OFF ON ON OFF ON ON OFF ON ON 3: S1.3~S1.8 INNER UNIT QUANTITY SETTING, S2.1 MASTER OR SLAVE UNIT SETTING, S2.4~2.8 ADDRESS SETTING
Model MDS280/300BR(Master Unit)
-48-

380V/3N~/50Hz

COIL INLET TEMPERATURE SENSOR TH2

N

R S T
L
FU
T 71
S DB3A 81 LPT HPT
R N 1 2 3 1 2 3
BLACK
BLACK
WHITE
WHITE
RED
RED
YELLOW
BLUE
RED
TR LOW-I HI-1 TH7 TH6 TH5 TH3 TH12 TH11 TH10 TH9 TH8 TH4 TH2 TH1 LOW-U HI-U
V1+
BLACK
V1-
KM1 KM2 KM3 KM4 KM5 WHITE
V2+ MDS-M
V2-
Bpc Apc Bin Ain

OL1 OL2 OL3 OL4 OL5 TO INDOOR UNIT
FIX3-OL
OL2 12 32
FIX2-OL
18 19 20
13
33 TO MASTER UNIT
21 22 23 24 25 26
OL1
FIX1-OL MDS-P
OL3 14
YELLOW
YELLOW
YELLOW
YELLOW
BROWN
DIG-OL
BLACK
WHITE
BLUE
BLUE
BLUE
BLUE
RED
RED
RED
RED LP
S1 S2 S3
L1 HP 15 OL4 16 OL5 17
HP
FANH
FANL
PMW
T2 T2 T2
4WV
FIX2
FIX1
SV2
SV1
DIG
T1 T3 T1 T3 T1 T3 N
M M M M
~ ~ ~ ~ L
EXV1 EXV4
G/Y
J1 J18
CRANKCASE CRANKCASE CRANKCASE
G/Y
G/Y
G/Y
HEATER HEATER HEATER 2 4 7 8 10 11
KM4 KM5 EXV4
3 5
FIXED COMPRESSOR1 FIXED COMPRESSOR2 DIGITAL COMPRESSOR FAN MOTOR
KM5 KM4 4WV KM2 KM1 KM3
DB3A PHASE PROTECTOR FU FUSE OVERLOAD PROTECTOR SETTING:

OL1 OL2 OL3 OL4 OL5
4WV 4 WAYS VALVE TR TRANSFORMER
14.0 14.0 14.0 3.3A 1.8A
KM SUBCOOLING
CONTACTOR EXV4
ELECTRONIC EXPANSIVE VALVE SWITCH SETTING:
MODEL S1.1 S1.2 S2.1 S2.2 S2.3 S3.1 S3.2 S3.3 S3.4
NOTE:
HP HIGH PREESURE SWITCH OL OVERLOAD PROTECTOR
AMDS260B OFF ON OFF OFF ON ON OFF OFF OFF 1: FIELD INSTALLATION
LPT LOW PREESURE SENSOR AMDS280B OFF ON OFF OFF ON ON OFF OFF ON
AMDS300B OFF ON OFF OFF ON ON OFF ON OFF
2: FACTORY WIRING
HPT HIGT PREESURE SENSOR OFF ON OFF OFF ON ON OFF ON ON
AMDS320B 3: S1.3~S1.8 INNER UNIT QUANTITY SETTING, S2.1 MASTER OR SLAVE UNIT SETTING, S2.4~2.8 ADDRESS SETTING
Model MDS260/280/300BR(Slave Unit)
-49-
2.7 Electric Connection
MDS040A/AR
2.7.1 MDS030A/AR MDS050A/AR
2.7.2 MDS050A/ARMDS060A/AR
-50-
240B/BR
2.7.3 MDS080
300B/BR
2.7.4 MDS260
-51-
2.8 Electric Data
MDS
2.8.1 Outdoor Unit
MDS030A/ MDS040A/ MDS050A/ MDS060A/ MDS050A/ MDS060A/
Model
MDS030AR MDS040AR MDS050AR MDS060AR MDS050AR MDS060AR
Power supply 220V/50Hz 380V /3N/50Hz
2
Power Cross section area(mm ) 6(2.5) 4(2.5)
cable Q.T.Y 2(1) 4(1)
Model MDS080B/ MDS100B/ MDS120B/ MDS150B/ MDS180B/ MDS200B/

MDS080BR MDS100BR MDS120BR MDS150BR MDS180BR MDS200BR
Power supply 380V /3N/50Hz
Power Cross section area(mm2) 6 10
cable Q.T.Y 5
Model MDS220B/ MDS240B/ MDS260B/ MDS280B/ MDS300B/

MDS220BR MDS240BR MDS260BR MDS280BR MDS300BR
Power supply 380V /3N/50Hz
2
Power Cross section area(mm ) 10 16
cable Q.T.Y 5
MCC
2.8.2 Indoor unit
Model MCC008T MCC010T MCC015T MCC018T MCC020T MCC025T MCC030T MCC040T MCC050T MCC060T

Power Cross section area(mm2) 1.5 2.5
cable Q.T.Y 3
MCK
2.8.3 Indoor unit
Model MCK010T MCK150T MCK180T MCK020T MCK025T MCK030T MCK040T MCK050T
2
Power Cross sectionarea(mm ) 1.5 2.5
cable
Q.T.Y 3
MDB
2.8.4 Indoor unit
Model MDB050T MDB060T
2
Power Cross section area(mm ) 2.5
cable Q.T.Y 3
MCM
2.8.5 Indoor unit
Model MCM020T MCM030T MCM050T
2
Power Cross section area(mm ) 2.5
cable Q.T.Y 3
MWM
2.8.5 Indoor unit
Model MWM008T MWM010T MWM015T MWM020T MWM025T
2
Power Cross section area(mm ) 1.5 2.5
cable Q.T.Y 3
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.
-52-
C H A P T E R
3 Selection
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, seeAnnex 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:
Qtotal = F1q1 + F2q2+ + Fnqn
Where,
F1 -----The air conditioning area of each calculated unit (Unit: m2.)
q1 -----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 qF is known (see Annex 2), the heating load of the building is as follows:
Q = FqF
Where,
F -----The construction area (Unit: m2)
-53-
If we know the heat performance index qv[W/(m3 . )] and outside volume V (m3), we can
calculate the heating load
as follows:
Qtotal = aqvV( tnJtw)
Where,
a is the correction factor. For details, see the table.
qv 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:m2)
(tn -tw) is the calculated difference between the indoor and outdoor temperatures. (Unit:)
Heating correction factor a:
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
Heat performance index of the building
Building type V (103 m3) qvW/m3 tn Building type V(103 m3) qv W/m3 tn
5 0.6 510 3.38
Office 510 0.53 18 Workshop 1120 2.73 14
building 1115 0.49 2130 2.04
15 0.56 31 1.45
5 0.72 0.5 2.30
Club 510 0.65 16 Equipment 0.61.0 0.82 12
11 0.58 room 1.12.0 0.71
2.1 0.50
5 0.81 0.5 0.83
Hospital 610 0.75 20 0.61.0 0.72 18
Auxiliary room
1115 0.67 1.12.0 0.56
16 0.64 2.1 0.51
5 0.92
610 0.82 2.0 0.72
Cinema 1115 0.79 14 Fire engine 2.15.1 0.63 15
1620 0.70 house 5.1 0.60
2130 0.65
31 0.61
5 1.22 5.0 1.49
Public area 610 1.14 14 Bathroom 5.110.0 1.38 25
11 1.05 10 1.25
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.
-54-
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.
-55-
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
Rate of a combination of indoor units

Outdoor unit
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
3.3.2 Capacity Indexes of Indoor Unit (MCC)
Unit spec 008 010 015 018 020 025 030 040 050 060
Capacity index 20 25 37 45 56 65 78 106 124 144
3.3.3 Capacity Indexes of Indoor Unit (MCK)
Unit spec 010 015 018 020 025 030 040 050
Capacity index 28 36 45 54 65 75 100 125
3.3.4 Capacity Indexes of Indoor Unit (MCM)
Unit spec 020 030 050

Capacity index 58 75 125
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
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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.
OUC is the capacity of the outdoor unit. unit: kW.
INX is the capacity index of each indoor unit.
TNX 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)
3.3.9 Change of Heating Capacity (3-30HP)
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.
-57-
3.3.10 Temperature-related Cooling Capacity Correction Factors
3.3.11 Temperature-related Heating Capacity Correction Factors
-58-
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
No. Return air flow pattern Range Advantages and disadvantages
Side air supply The room with low floor Staffs are in the return air flow area, need for little or no space, and the
1 air vent can be adjusted freely. But, the exposed ceiling in the room
upper air return height or large depth
has two difference heights or there are two exposed ceilings.
Upper air supply The room with high floor height The fan coil of air pipe in the exposed ceiling makes the fittment
2 easy. But, higher floor height is required and certain exposed ceiling
upper air return and only for cooling in Summer space is occupied.
Staffs are in the return air flow area, the fan coil of the unit does not
3 Side air supply
The room with low floor height occupy the indoor space in the corridor, and the air vent can be
side air return adjusted freely.But, short-flow may occur easily.
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.
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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
Air flow pattern diagram
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=RmL(1+K) (Pa)
Rm=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.
-60-
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 construc-
tion 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 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
Specifications of the round air pipe Unit: mm

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.
-61-
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.
Recommended thickness of steel air pipes and accessories Unit: mm
Diameter of round air pipe or

length of the longest side of rect- 320 340450 480630 6701000 11201250 13202000
angular air pipe
Rectangular Low-speed air pipe 0.5 0.6 0.8 1.0 1.2

air pipe 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
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.
Air pipe elbow

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 low-
pressure 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.
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Acceptable (CO2) density
Acceptable CO2 density

Room type
L/m3 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 inpositive 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.
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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-
The following tables show the refrigerant copper pipe dimension specifications.
For MDS-A series
Outdoor unit capacit

3.0HP 4.0HP/5.0HP 6.0HP
Specification
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
Total capacity of <16kW 9.52mm x t0.8

Liquid the indoor unit to
16kW22.5kW
pipe which the pipe is
connected. >22.5kW
<9.0kW 15.88mm x t1.0

Total capacity of
Gas the indoor unit to 9.0kW16kW 19.05mm x t1.2
pipe which the pipe is 16kW21kW
connected.
>21kW
Between the tap joint and the indoor unit

Liquid Total capacity of the <4kW 6.35mm x t0.7
indoor unit to which the
pipe pipe is connected. 4kW 9.52mm x t0.8
<2.8kW 9.52mm x t0.8

Total capacity of
Gas 2.8kW4.5kW 12.70mm x t1.0
the indoor unit to
pipe
which the pipe is 4.5kW8kW 15.88mm x t1.2
connected.
>8kW 19.05mm x t1.2
For MDS-B series
Outdoor unit capacit 8.0HP 15.0HP/18.0HP 22.0HP 26.0HP/28.0HP

12.0HP
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

Total capacity of
Liquid the indoor unit to 15kW22.5kW 12.70mm x t1.0
pipe which the pipe is
22.5kW50kW 12.77mm x t1.0 15.88mm x t1.2
connected.
50kW85kW 19.05mm x t1.2
<9.0kW 15.88mm x t1.2
9.0kW15kW 19.05mm x t1.2

Total capacity
15kW21kW 25.40mm x t1.2
of the indoor
Gas
unit to which 21kW31kW 28.06mm x t1.2
pipe
the pipe is 31kW39kW 31.75mm x t1.4
connected.
39kW50kW 34.9mm x t1.4
50kW69kW 38.1mm x t1.6
69kW85kW 41.3mm x t1.6
Between the tap joint and the indoor unit
Liquid pipe The indoor unit to which the pipe is connected. Consistent to the indoor unit port
Gas pipe The indoor unit to which the pipe is connected. Consistent to the indoor unit port
-65-
Refnet joint type selection
Ytype
Unit: mm
Length (mm) Diameter (mm) Diameter (mm) Diameter (mm)

Refnet
joint type E(outer I(outer N(outer
A B C D F G H diameter) J K L M O P Q R
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
Type: MDS-Y5
Unit: mm
-66-
Type : MDS-C1
Unit: mm
TypeMDS-C2MDS-C3
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
MEX-14-2SA-A
MCK010/015
MWM008/010/015 MEX-14-2SA-B
MWM020 MEX-18-2SA-B
MCC018/020/025
MCK018/020/025 MEX-18-3SA-A
MCM020
MWM025 MEX-18-3SA-B
MCC030/040/050/060
MCK030/040 MEX-24-3SA-A
MCM030
MCK050
MEX-30-3SA-A
MCM050
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C H A P T E R
4 Installation
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
-68-
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.
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.
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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.
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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.
-71-
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.
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).
-72-
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:
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.
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.
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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.
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.
-74-
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.
Return Air and Supply Air Direction
Drawings for piping connector and its dimension (unit: mm):
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.
-75-
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.
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
-76-
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:
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:
Horizontal ceiling mounted

1. To remove the return air grill, frame, side panel and suspending panel as shown as below:
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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
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).
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:
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
-78-
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:
indoor units' cap

50% 130%
outdoor units' cap
Note:We strongly recommend that the capacity modulation equals to 100%.
Refrigerant piping limit
Allowable value piping section
Actual length 250m L1+L2+Li
Piping Actual length 125m

Max. length(m) L1+L2+Li
Equivalent length 150m
The length from the first branch to the remotest unit L(m) 40m L2+L3+Li
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 -
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.
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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).
-80-
Connection of refnet joint and distributor kit
Only connected by the refnet joint
Only connected by the distributor kit
Connected by the refnet joint and the distributor kit
-81-
Refrigerant Piping Installation:

Refrigerant piping should use the appointed diameter pipe;
Refnet joint must be installed horizontally or vertically.
Distributor kit must be installed horizontally.
Distributor kit should be connected to indoor unit directly, it is not allowed to connected to the
distributor kit or refnet joint.
-82-
The EXV must be installed vertically
4.3.2 Refrigerant Piping Assembly Process
install the indoor unit cut the piping required install the pipe nitrogen charging
Sequence
welding blow air leakage test dry
Three principle of the refrigerant piping assembly
Processing method
Dry Piping assembly air blow dry
Nitrogen charging
Clean air blow
Piping assembly
Use the right material such as copper and welding rod

No air leakage Abide by the welding process
air leakage test
Abide by the flare fitting process
Three principle of the refrigerant pipe
Dry Clean No air leakage

no moisture no dust No refrigerant leakage
-83-
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.
-84-
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:
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.
-85-
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.
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.
-86-
4.3.7 Process Sequence of Air Leakage Test
No
refrigerant piping Pressure is the pressure
assembly finished charging released? Pass
yes
check and
maintain it
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/cm 2 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/cm 2 and the tempera-
ture is 20, then you can have a conclusion that it is OK.
-87-
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/cm2).
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
4.3.9 Copper Pipe Insulation
Refrigerant piping
pipe insulation air leak test pipe insulation
assembly
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.
-88-
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
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 10degrees Celsius, the liquid pipe should also be insulated.
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: Re-
move 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.
-89-
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,
Ball valve (liquid side) 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,
Ball valve (gas side) 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 Nm to 15 Nm.
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)
The following table shows the dimension of the copper flare fitting. Unit: mm
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
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
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 1418 6090
9.52 3542 6090
12.7 5057.5 3060
15.88 7580 3060
19.05 100140 2035
-90-
4.3.11 Refrigerant charging
Calculate the refrigerant amount accord-

ing to the length of the liquid pipe Add additional refrigerant
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
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.
-91-
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
0 5 -755
Type of vacuum pump and the vacuity
Application
Type Max. exhaust volume
Vacuum drying Air discharge
0.02mmHg
Vacuum pump with lubricant Suitable Suitable
100L/min
10mmHg
Unsuitable Suitable
40L/min
Vacuum pump without lubricant
0.02mmHg
Unsuitable Suitable
50L/min
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.
Notes
Vacuum should be held both in the liquid pipe and the gas pipe at the same time.
-92-
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
-93-
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:
2L/hx 2(HP) x 3(sets) +2L/h x 3(HP) x 2(sets) = 24L/h.
Main horizontal pipe Vs condensated water flow rate
Polyethylene pipe allowable flow rateL/h

JIS Remark
diametermm 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:
Suppose the moisture is 10% in the pipe.
After the header pipe, the pipe should be larger or equal to VP30.
Vertical pipe Vs condensated water flow rate
JIS Polyethylene pipe diametermm allowable flow rateL/h Remark

VP20 20 220
unsuitable for
VP25 25 410
the header pipe
VP30 31 730
VP40 40 1440
VP50 51 2760
Suitable for the header pipe
VP65 67 5710
VP75 77 8280
Note:
The vertical pipe should be larger than VP30
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.
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4.4.2 Making and Mounting Condensate Pipes
Procedure:
Install the connect the con- check for insulate the
indoor units densate pipe water leakage pipe from heat
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:
Grade Nominal diameter Interval

Hard PVC pipe 25~40mm Less than 1.0m
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.
-95-
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.
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
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).
-96-
4.4.8 Installation of the Drainage Lift Pipe
Use the gradienter to check if the indoor unit If the drainage pipe needs to be lifted up, it
is parallel to the ceiling, should be less than 300mm. If it is more than
500mm, maybe it will result in the refrigerant
leakage.
After connecting, the hose should not be Do not give external force to one side of the unit,
higher than the connecting port. This can and the drainage pipe should not be loose and it
prevent the water from flowing backwards. should be fixed.
If the water collecting header is installed, please refer to the following:
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C H A P T E R
5 Testing
5.1 Hardware Diagram and Configuration
5.1.1 MDS Series Indoor Units
Power supply 3-speed fan
Temperature measurement Electronic expansion valve
Communication port 1 indicator

Communication port 2 Electric heater
Memory 3 Swing
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.
SW1:DIP switch SW2: DIP switch for SW3: DIP switch

for function setting indoor unit address setting for model setting
Model 1 setting (SW1.1 SW1.6)
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
-98-
Address settings (SW2.1___SW2.6)
Unit address SW2.1 SW2.2 SW2.3 SW2.4 SW2.5 SW2.6

0 0 0 0 0 0 0
1 0 0 0 0 0 1
2 0 0 0 0 1 0
3 0 0 0 0 1 1
4 0 0 0 1 0 0
5 0 0 0 1 0 1
6 0 0 0 1 1 0
7 0 0 0 1 1 1
8 0 0 1 0 0 0
9 0 0 1 0 0 1
10 0 0 0 1 0 1
11 0 0 1 0 1 1
12 0 0 1 1 0 0
13 0 0 1 1 0 1
14 0 0 1 1 1 0
15 0 0 1 1 1 1
16 0 1 0 0 0 0
17 0 1 0 0 0 1
18 0 1 0 0 1 0
19 0 1 0 0 1 1
20 0 1 0 1 0 0
21 0 1 0 1 0 1
22 0 1 0 1 1 0
23 0 1 0 1 1 1
24 0 1 1 0 0 0
25 0 1 1 0 0 1
26 0 1 1 0 1 0
27 0 1 1 0 1 1
28 0 1 1 1 0 0
29 0 1 1 1 0 1
30 0 1 1 1 1 0
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 1 0 1 0 1 1
44 1 0 1 1 0 0
45 1 0 1 1 0 1
46 1 0 1 1 1 0
47 1 0 1 1 1 1
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Model 2 settingSW3.5 SW3.8
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 settingSW3.1 SW3.4
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
5.1.2 MDS-A Series Outdoor Units
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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
reenergise:
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-
-101-
DIP switch setting
J1 settings (1:ON: 0:OFF)
J1.1 J1.2 Initial opening extent J1.1 J1.2 Initial opening extent
of the expansion valve of the expansion valve
0 0 300 1 0 400
0 1 350 1 1 450
J1.3 reserved
J1.4: J1.5: J1.6: J1.7 capacity settings
No. J1.4 J1.5 J1.6 J1.7 Capacity

1 0 0 0 0 10.0kW/4HP
2 0 0 0 1 12.5kW/5HP
3 0 0 1 0 15.0kW/6HP
4 0 0 1 1 22.5kW/8HP
5 0 1 0 0 28.1kW/10HP
6 0 1 0 1 3HP
Note: Other DIP switches are reserved.
J2 settings (1: ON: 0: OFF)

D1D5 indicate the local address during intercommunication:
J2.1 J2.2 J2.3 J2.4 J2.5 Address J2.1 J2.2 J2.3 J2.4 J2.5 Address
0 0 0 0 0 0 0 0 0 0 1 16
1 0 0 0 0 1 1 0 0 0 1 17
0 1 0 0 0 2 0 1 0 0 1 18
1 1 0 0 0 3 1 1 0 0 1 19
0 0 1 0 0 4 0 0 1 0 1 20
1 0 1 0 0 5 1 0 1 0 1 21
0 1 1 0 0 6 0 1 1 0 1 22
1 1 1 0 0 7 1 1 1 0 1 23
0 0 0 1 0 8 0 0 0 1 1 24
1 0 0 1 0 9 1 0 0 1 1 25
0 1 0 1 0 10 0 1 0 1 1 26
1 1 0 1 0 11 1 1 0 1 1 27
0 0 1 1 0 12 0 0 1 1 1 28
1 0 1 1 0 13 1 0 1 1 1 29
0 1 1 1 0 14 0 1 1 1 1 30
1 1 1 1 0 15 1 1 1 1 1 31
J2.6, ON: cooling only OFF: heat pump
J2.7, J2.8 reserved
JP1 and JP2 are used to set matched resistance for communication terminals. The last switch on the manifold
must be shorted, while other switches remain in open circuit.
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5.1.3 MDS-B Series Outdoor Units
DIP switch setting

Note: 1: 1: ON, 0: OFF
S1 (1~2)
1 2
1 MDSA Cooling only
0 MDSB Heat pump
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S1 3~8 indicate the number of connected indoor units
Qty 3 4 5 6 7 8 Qty 3 4 5 6 7 8
1 0 0 0 0 0 0 25 0 1 1 0 0 0
2 0 0 0 0 0 1 26 0 1 1 0 0 1
3 0 0 0 0 1 0 27 0 1 1 0 1 0
4 0 0 0 0 1 1 28 0 1 1 0 1 1
5 0 0 0 1 0 0 29 0 1 1 1 0 0
6 0 0 0 1 0 1 30 0 1 1 1 0 1
7 0 0 0 1 1 0 31 0 1 1 1 1 0
8 0 0 0 1 1 1 32 0 1 1 1 1 1
9 0 0 1 0 0 0 33 1 0 0 0 0 0
10 0 0 1 0 0 1 34 1 0 0 0 0 1
11 0 0 1 0 1 0 35 1 0 0 0 1 0
12 0 0 1 0 1 1 36 1 0 0 0 1 1
13 0 0 1 1 0 0 37 1 0 0 1 0 0
14 0 0 1 1 0 1 38 1 0 0 1 0 1
15 0 0 1 1 1 0 39 1 0 0 1 1 0
16 0 0 1 1 1 1 40 1 0 0 1 1 1
17 0 1 0 0 0 0 41 1 0 1 0 0 0
18 0 1 0 0 0 1 42 1 0 1 0 0 1
19 0 1 0 0 1 0 43 1 0 1 0 1 0
20 0 1 0 0 1 1 44 1 0 1 0 1 1
21 0 1 0 1 0 0 45 1 0 1 1 0 0
22 0 1 0 1 0 1 46 1 0 1 1 0 1
23 0 1 0 1 1 0 47 1 0 1 1 1 0
24 0 1 0 1 1 1 48 1 0 1 1 1 1
S2 (1) S2 (23)
0 Slave module Initial opening

2 3
1 Master module extent of the valve
0 0 200
0 1 250
1 0 300
1 1 350
S2 (4~8) addresses of the outdoor unit
Address No. 4 5 6 7 8 Address No. 4 5 6 7 8

0 0 0 0 0 0 16 1 0 0 0 0
1 0 0 0 0 1 17 1 0 0 0 1
2 0 0 0 1 0 18 1 0 0 1 0
3 0 0 0 1 1 19 1 0 0 1 1
4 0 0 1 0 0 20 1 0 1 0 0
5 0 0 1 0 1 21 1 0 1 0 1
6 0 0 1 1 0 22 1 0 1 1 0
7 0 0 1 1 1 23 1 0 1 1 1
8 0 1 0 0 0 24 1 1 0 0 0
9 0 1 0 0 1 25 1 1 0 0 1
10 0 1 0 1 0 26 1 1 0 1 0
11 0 1 0 1 1 27 1 1 0 1 1
12 0 1 1 0 0 28 1 1 1 0 0
13 0 1 1 0 1 29 1 1 1 0 1
14 0 1 1 1 0 30 1 1 1 1 0
-104-
15 0 1 1 1 1 31 1 1 1 1 1
S3 (1~4) capacity of the outdoor unit:MDS-A
Address No. 5 6 7 8
3HP 0 0 0 0
4HP 0 0 0 1
5HP 0 0 1 0
6HP 0 0 1 1
S3 (1~4) capacity of the outdoor unit:MDS-B
Address No. 1 2 3 4
8HP 0 0 0 0
10HP 0 0 0 1
12HP 0 0 1 0
15HP 0 0 1 1
18HP 0 1 0 0
20HP 0 1 0 1
22HP 0 1 1 0
26HP 0 1 1 1
28HP 1 0 0 0
32HP 1 0 0 1
5.2 Trial Run
Precautions
Power up the system 12 hours while you run it for the first time so that the shaft can be
preheated in advance;
After the main power supply is switched off, please don start the second trial run until the
system is powered for 2.5 hours;
If the heater is not heated, to protect the compressor, don't start the system until it is powered
for 2 hours.
Check the power supply between the outdoor units and the distribution unit (it is
recommended you use a 3-phase detector).
Check the indoor units.
Check the power cable and the signal cable of each indoor unit are properly connected (the
signal cable is marked with A and B);
If the power cable is mixed with the signal cable, the circuit board might go faulty.
Although the signal cable is not marked in color, please note the color, because the signal
cable features polarity;
Check if the addresses are correctly set for the indoor units;
Address switches begin with 0;
Each indoor unit must be configured with a different address.
-105-
C H A P T E R
6 Servicing and Maintenance
6.1 User Guide
6.1.1 Responsibilities and Obligations

This product is covered under MacQuay warranty during the warranty period.
Only MacQuay technicians or experienced professionals designated by MacQuay are
allowed to install, test, repair and maintain this product series.
6.1.2 Unpacking Inspection

Upon receipt of the units, please check them against the packing list. Check carefully if the
units are damaged during the transportation, and if all the components are complete and
in good condition. In case of any damaged unit or missing parts, please inform MacQuay's
local branch or dealer in writing immediately.
6.1.3 Using the Units

The total installed capacity of indoor units can be greater than but not more than 130%
of the capacity of outdoor units. However, when the total capacity of indoor units in
operation must not exceed that of the outdoor units. Otherwise, the output of each indoor
unit can reach their rated value;
All the indoor units are powered in a centralized manner. Before servicing and
maintenance, be sure to turn off the main power between the units;
After receiving the stop signal, each indoor unit will have its fan and electronic expansion
valve running for another 20~60 seconds, to make use of the afterheat or the cool air that
remains in the heat exchanger and also to get ready for the next start. This is normal.
When the running mode of the indoor unit is in conflict with the running mode of the
outdoor unit, the hand controller will display a message indicating this indoor unit stops
running because of the operation conflict. In this case, you can switch the indoor unit to
a running mode not conflicting with the outdoor unit, to restore the system to normal. The
cooling mode does not conflict with the dehumidifying mode, while the air supply mode
does not agree with any other mode.
The digital compressor adjusts the volume of refrigerant by opening and closing the
PWM solenoid. While the solenoid is operating, it clicks periodically. This is normal.
-106-
6.2 Servicing and Maintenance
> Caution:
Do not use or place inflammable and explosive articles beside the air-conditioning unit;
Power the indoor units in a centralized way;
Please check the parts like installing support often to see if they are damaged after longtime
service;
Do not alter or repair the product without authorization. To relocate the air conditioner, please
contact your dealer or professional installation personnel;
Do not install the air conditioner without authorization, to make sure the air-conditioning unit
can operate reliably for a long time;
In case of failure, please turn off the main power switch of the air-conditioning unit immediately;
Do not remove the blade shield of an outdoor unit. Never put your hand or foreign matters in
the air outlet;
Do not perform a check or repair while the air-conditioning unit is running;
Do not water the unit or operate the air-conditioning unit with wet hands.
6.2.1 Precautions
Before installation, please check if the power supply in use is the same as that indicated on
the nameplate, and if it is safe;
Before using the air conditioner, please check and make sure that the power cables are
properly connected, to avoid electric shock or fire;
Keep the air-conditioning unit out of the reach of children;
Before cleaning the air-conditioning unit or replacing the air filter, please turn off the main power
switch;
If you leave this air-conditioning unit idle for a log time, please be sure to switch it off;
Do not step on the air-conditioning unit or place anything on it;
The mains outlet must be securely grounded, to make sure the air-conditioning unit is also
properly grounded, and to avoid electric shock. Be sure not to collect a power cable to the gas
pipe, tapping pipe, lightning arrester or telephone set;
Once the air conditioner is switched on, be sure not to turn it off until it remains in operation
for over 5 minutes, to avoid affecting the oil return of the compressor;
Be sure to check the units, once they are installed, for electric leakage.
6.2.2 Servicing and Maintenance

Daily maintenance
All the units are strictly tested and inspected before they leave factory. To make sure the units
remain operational for a long time, users are supposed to maintain and service the units, check
and repair them at regular intervals.
Maintenance and care of indoor units MCC, MDB
Air filter
Depending on the environment to be conditioned, the air filter is usually installed at the air
outlet, to effectively filter out the smoke, dust, dirt, pollen and foreign matters in the air. Before
the filter is blocked, cleaning makes less sense. The filter should be cleaned at certain intervals
depending on where it is mounted and located as well as the amount of foreign matter. The
air filter can be made of washable fiber nylon or leno. While cleaning the filter, you can put it
on a hard surface and knock it gently, to clear away heavy particles. If necessary, wash it in
warm water using neutral detergent. Do not remount the filter until it gets dry.
-107-
Fan motor
This component requires only a little care. As the motor is lubricated and sealed before the
equipment leaves factory, no more lubrication is needed. After the unit remains in service for
six months, be sure to check the fan motor is entirely insulated from the ground.
Heat exchanger
Clean the dust and foreign matters from the surface of heat exchanger using a cleaner together
with a nylon brush. Please note that there is no need to clean the surface if you use an
appropriate air filter and take proper care of the heat exchanger.
Fire damper
Please check the damper once every three months, to see if the fuse link is broken or has any
fallen blade, becomes flexible or even falls off, and if it functions well.
Drainpipe
Before the unit is running, check if the drain pipe is blocked, to ensure smooth discharge of
condensate water. As the condensate water is prone to bacteria, please check the water
collector around the end of each quarter, to see if it smells unusual. If so, put some medicine
containing algaecide and penetrant in the collector to prevent bacteria and slime.
Replacing parts
You can get parts from nearby dealers. Be sure to indicate the following information about the
parts you need: unit model, factory number, name and quantity.
For a unit equipped with a temperature controller, lease note the following:
Make sure the start switch is closed;
Press the ON button on the start switch;
Set the air-conditioner to your desired temperature;
The rotating speed of the fan is usually preset;
After the unit stops running, to restart the compressor, please wait at least 3 minutes
(except that the unit is equipped with a 3-minute relay) so as to protect the compressor;
Sometimes you may install an air output control unit to control the air volume.
Maintenance and care of indoor unit MCK

Although the air-conditioner is designed to have a long service life even with minimal care, be sure
to check it at regular intervals throughout its service, so that you can use the air-conditioner better.
-108-
Part Procedure Recommended interval
1. Open the air input grid and take out the air filter and air refresher;
2. Disassemble the air filter and the air refresher;
3. Clear the dust away from the air filter using a cleaner or water
below 40 containing neutral detergent. Never wash the air
Air filter (indoor unit) refresher; At least once a month
4. Until the air refresher and the air filter, put them back in the air
input grid. At least once a month Caution: Never use gas,
dehydrating agent, benzene or any other chemical.
Wipe the dirt and dust off the grid and panel with a piece of soft cloth
soaked in warm water, cold water or neutral washing powder. Caution:
Indoor unit At least once a month
Never use gas, dehydrating agent, benzene or any other volatile
chemical, to avoid deforming the plastic surface.
Condensate water 1. Check them to see if they are clean. Wash them if necessary.
Once every three months
collector and pipe 2. Check for the flow of condensate water.
Indoor fan Check it to see if there is any unusual noise. When necessary
1. Check and clear the dirt between the blades;
Indoor fan, coil pipe 2. Check and clear any foreign matter that blocks the air flow inside Once a month
of outdoor unit the indoor unit and the outdoor unit.
1. Check the operating current and voltage of the indoor unit and
Power supply Once every two months;
outdoor unit;
Once a year
2. Check if the electric lines are securely connected.
Check the weld junctions and joints of the refrigerant pipes to see if
Compressor Once every six months
they are airtight.
The lubricating oil is filled by the manufacturer. If the refrigerant
Compressor lube No need for care
circulating pipe is properly airtight, there is no need to refill the pipe.
All the motors are properly lubricated and sealed before they leave
Fan motor lube No need for care
factory.
[Note]: Maintenance and care before the first operation in each season when the air-conditioning unit is put into
operation
Thoroughly check and clean the indoor and outdoor units;

Clean or replace the air filter;
Clean the drain pipe;
Clean the coil of the outdoor unit indoors;
Check the fan for dynamic balance before running;
Secure all electric connections;
Check if the refrigerant leaks.
Maintenance and care of outdoor units
Normally, for an air-cooled duct unit produced by MacQuay, you only need to check and clean the
heat exchanger on a quarterly basis. However, if the unit is operating in an oily, salty, wet or dirty
environment over a long period of time, ask professional air-conditioning service personnel to
service the unit so that the unit can operate and function well. Otherwise, the service life of the
unit might be shortened.
Care of the compressor
If the unit gets restarted after staying idle for a long time, do not restart the compressor until
you keep the compressor, crankcase and heat exchanger of the outdoor unit powered for at
least 24 hours.
Care of the heat exchanger
Maintain the heat exchanger once around the end of the running season. If a blade of the heat
exchange falls sideways, be sure to put it upright. If any dust or foreign matter is present on
the surface of the heat exchanger, use a clean together with a nylon brush to clean it. If
-109-
compressed air source is available, please use it to blow away the dust from the surface of the
heat exchanger. If the unit is operating in an oily, salty, wet or dirty environment, do clean it with
special-purpose detergent. It is not advised to wash it with water. Please use special-purpose
detergent to clean a dusty heat exchanger (for example, SF-98 or YD-402).
Please note the following while using the unit:
While the unit is running, please do not point any pole or any other hard material to the
equipment through the exhaust hood, to avoid bodily injuries and equipment failures;
During the airtight and leakage test, never let inflammable gases like oxygen and
acetylene into the cooling loop, to avoid hazards. Do perform tests of this kind using
nitrogen or refrigerant.
Care at the beginning and end of the running season
Beginning of the season
Check the return air inlet and outlet to see if they are blocked. If so, remove the obstacle;
Check that the grounding unit is in good condition to ensure that the air-conditioning unit
operates safely.
Thoroughly check the and clean the indoor and outdoor units;
Clean or replace the air filter;
Clean the drain pipe;
Secure all electric connections;
Check if the refrigerant leaks. Please ask professionals to troubleshoot the unit and
clean the filter.
End of the season
On sunny days, have your air-conditioner running in air supply mode half a day, to keep
the inside dry;
Turn off the power. Otherwise, the unit still consumes power.
Ask professionals to troubleshoot and clean the filter.
Important notice for daily operation, maintenance and care

Set the unit to an appropriate room temperature, preferably within the range of 26~ 28
for cooling and 18 ~ 236 for heating;
Keep the windows and doors in the air-conditioned room closed, to avoid lowering the
efficiency of the air-conditioning unit;
Use a curtain or shutter for the windows to keep out direct sunshine;
Do not put any floc or anything else around the air outlet and the return air inlet. Otherwise,
the unit might work at a lower efficiency or even fail;
Mechanical wear and dust inside the unit might worsen the performance of the unit. Be sure
to clean and maintain the unit in due time;
If the air-conditioner stays idle for a long time, please switch it off. To protect the air
conditioner, switch it on at least 24 hours before you use it again, to heat up the compressor
and the heater.
Caution
In case of any exception (say, burning smell), turn off the power immediately, and seek help
from the local branch or dealer;
If you continue using the air-conditioning unit even after the exception takes place, this might
damage the unit or even result in electric shock or fire;
Only professional service personnel are allowed to maintain the air conditioner. Be sure to
turn off the power before touching the termination.
Never clean the air condition before it is switched off. Otherwise, you might suffer an electric
shock or a bodily injury.
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C H A P T E R
7 Fault Codes and Troubleshooting
Fault codes here refer to the codes that appear on the remote control. If a host computer is available,
the fault cause is directly displayed.
7.1 Fault Codes for MDS-A/B Series
No. Fault code Description No. Fault code Description

1 E0 System malfunction 34 H5 Sensor broken, high pressure
2 E1 Sensor broken(TH1 discharge temp) 35 H6 Discharge temp. too high
3 E2 Sensor broken(TH2 inlet coil 1#) 36 L0 Protection for too small degree of overheat
4 E3 Sensor broken(TH3 mid coil 1#) 37 L1 Low pressure too low
5 E4 Sensor broken(TH4 inlet coil 2#) 38 L2 Sensor broken, low pressure
6 E5 Sensor broken(TH5 mid coil 2#) 39 10 System malfunction
7 E6 Sensor broken(TH6 inlet coil 3#) 40 11 Sensor broken(slave TH1 discharge temp.)
8 E7 Sensor broken(TH7 mid coil 3#) 41 12 Sensor broken(slave TH2 inlet coil 1#)
9 E8 Sensor broken(TH8 ambient temp..) 42 13 Sensor broken(slave TH3 mid coil 1#)
10 E9 Sensor broken(TH9 outlet coil) 43 14 Sensor broken(slave TH4 inlet coil 2#)
11 EA Sensor broken(TH10 subcool outlet) 44 15 Sensor broken(slave TH5 mid coil 2#)
12 EB Sensor broken(TH11 subcool suction) 45 16 Sensor broken(slave TH6 inlet coil 3#)
13 EC Sensor broken(suction) 46 17 Sensor broken(slave TH7 mid coil 3#)
14 EF Emergency run 36 L0 Super heat too low 47 18 Sensor broken(slave TH8 ambient temp.)
15 F0 Outdoor storage malfunction 48 19 Sensor broken(slave TH9 outlet coil)
16 F1 Sensor broken(indoor inlet coil) 49 1A Sensor broken(slave TH10 subcool outlet)
17 F2 Sensor broken(indoor mid coil) 50 1B Sensor broken(slave TH11 subcool suction)
18 F3 Sensor broken(indoor outlet coil) 51 1C Sensor broken(slave TH12 suction)
19 F4 Sensor broken(indoor return air ) 52 1F Emergency run
20 F5 Sensor broken(indoor supply air) 53 20 Outdoor storage malfunction
21 F6 Indoor and controller communication malfunction 54 27 Ambient temp.. exceed the limit
22 F7 Ambient temp. exceed the limit 55 28 4WV malfunction
23 F8 4wv malfunction 56 29 Refrigerant leakage
24 F9 Refrigerant leakage 57 30 Digital comp overload
25 FA Controller storage malfunction 58 31 Fixed comp1 overload
26 FB Water pump(indoor drain pump) 59 32 Fixed comp2 overload
27 FC Indoor and outdoor communication malfunction 60 33 Fixed comp3 overload
28 FE Master and slave communication malfunction 61 34 High pressure too high
29 H0 Digital comp overload 62 35 Sensor broken, high pressure
30 H1 Fixed comp1 overload 63 36 Discharge temp. too high
31 H2 Fixed comp2 overload 64 40 Super heat too low
32 H3 Fixed comp3 overload 65 41 Low pressure too low
33 H4 High pressure too high 66 42 Sensor broken, low pressure
-111-
7.2 Indoor Unit Malfunction Code
F1 Sensor broken (indoor inlet coil)

F2 Sensor broken (indoor mid coil)
F3 Sensor broken (indoor outlet coil)
F4 Sensor broken (indoor return air )
F5 Sensor broken (indoor supply air)
F6 Indoor and controller communication malfunction
FA Controller storage malfunction
FB Water pump(indoor drain pump)
FC Indoor and outdoor communication malfunction
7.3 Indication Light Twinkle Related to Malfunction Code:
Type Heat Sleep/Fan Time/Dry

Sensor broken (indoor temp.) OFF OFF F
Indoor Water pump OFF F OFF
Indoor and outdoor communication malfunction F OFF OFF
Sensor broken (outdoor temp.) OFF F F
Overload, Compressors, Digital/fixed F F OFF
Pressure, Too high/too low F OFF F
Pressure sensor, Outdoor F F ON
System malfunction F F F
Other malfunctions F ON ON
Notes:
1. The mode confliction alarm is canceled, as it is not a malfunction, but a limiting operation. When
the mode confliction occurs, the indoor unit stops directly without making alarm.
2. The indoor and outdoor communication malfunction only belongs to this unit.
3. Simplify the light twinkle indication, and the indoor and outdoor malfunction contains master and
slave unit.
For example:
7.4 The Following Phenomena Are Not Unit Malfunctions:

Some odorous gas blows from the unit, because the unit sucks cigarette smoke and smell from
cosmetic, furniture and electric machine. We always hear fizzle from the unit when starting stopping
the unit, as the refrigerant flows in the unit. Sometimes we may hear click noise, because the
temperature change causes other parts expanding with heat and contracting with cold. The outdoor
unit generates buzz because of loading/unloading the digital scroll compressor.
-112-
C H A P T E R
Annexes
Annex 1(1) Parameters designed for various kinds of buildings
Cooling load (w/m2) Occupants Lighting Air flow Max. noise

Building
Sensible Total
cooling load cooling load m2/person W/m2 L/S dB(A)
Middle 65 95 10 60 5 3550
Office Far side 110 160 10 60 6 3555
Individual office 160 240 15 60 8 3045
Meeting room 185 270 3 60 9 4060
Classroom 130 190 2.5 40 9 3540
School
Library 130 190 6 30 9 3540
Cafeteria 150 260 1.5 30 10 4045
Apartment High rise, facing south 110 160 10 20 10 3540
building High rise,facing north 80 130 10 20 9 3540
Theater, auditorium 110 260 1 20 12 4045
Laboratory 150 230 10 50 10 3545
Library, museum 95 150 10 40 8 3540
Operation room 110 380 6 20 8 3040
Hospital
Public area 50 150 10 30 8 3540
Clinic, health center 130 200 10 40 10 3545
Barbershop, beauty salon 110 200 4 50 10 3540
Underground 150 250 1.5 40 12 3545
Deparment Middle floors 130 225 2 60 10 3545
store
Upper floors 110 200 3 40 8 3545
Drug store 110 210 3 30 10 3540
Retail store 110 160 2.5 40 10 3545
Store for choice consumer goods 110 160 5 30 10 3540
Computer room 100 200 8 40 5.5 3540
Gymnasium 180 320 1 30 6 3545
Theater 130 220 1 20 7 3035
Single room 90 120 10 60 15 3035
Double room 100 150 10 60 15 3035
Disco 280 400 1 100 8 3035
Bar 130 260 2 15 10 3540
Chinese food restaurant 220 400 2 60 10 3540
Western food restaurant 160 320 2 60 10 3540
Rest- Room 80 130 10 15 7 3040

aurant Public area 110 160 10 15 8 3545
Assembly shop 150 260 3.5 45 9 4555
Factory
Light industry 160 260 15 30 10 4050
Parlor 160 240 6 20 8 3540
Playing
area General match 110 220 5 40 12 3545
Open event 110 240 3 80 12 4050
[Note]: The above data is for reference only.
-113-
Annex 1 (2) Heat load indexes designed for air-conditioning in some of the Chinese buildings
No. Building type Heat load index No. Building type Heat load index
and room name W/m2 and room name W/m2
1 Office building,school 58-80 6 Store 64-87
2 Residential building 46-70 7 Single-floor 85-105

residential building
3 Hospital, kindergarten 64-80 8 Dining room 116-140
4 Hotel 58-70 9 Cinema 93-116
5 Library 46-76
Annex 2 Max. flow velocity at the air outlet (Unit: mm)
Place Pan outlet Ceiling outlet Side outlet

Broadcasting studio 3-3.5 4-4.5 2.5
Hospital ward 4-4.5 4.5-5 2.5-3
Hotel room, parlor 4-5 5-6 2.5-4
Department store, theater 6-7.5 6.2-7.5 5-7
Classroom, library, office building 5-6 6-7.5 3.5-4.5
Annex 3 Table of recommended wind speeds for central air-conditioning
Recommended wind speed (m/s) Max. wind speed (m/s)

Position Residential Public Residential Public
Factory Factory
building building building building
Air duct inlet 3.5 4.0 5.0 4.5 5.0 7.0
Fan outlet 58 6.510 812 8.5 7.511 8.514
Main air duct 3.54.5 5.06.5 69 46 5.58.0 6.511
Branch air duct 3.0 3.04.5 4.5 3.55.0 4.06.5 59
Fresh air inlet 3.5 4.0 5.0 4.0 5.0 7.0
Air outlet from

the branch duct 2.5 33.5 4.0 3.254 46 58
Annex 4 Criteria of environment noise in urban areas
Category Scope of application Daytime (dB) Nighttime (dB)

0 Sanatorium, top-grade villa, top-grade hotel 50 40
Areas intended mainly for residence,

1 55 45
culture & education,business and industry
2 Areas intended for residence, 60 50
business and industry
3 Industrial estate 65 55
On both sides of urban roads

4 and traffic arteries 70 55
Annex 5 Table of recommended diameter for condensate water pipes
Min. slope of pipes Cooling load (kW)

0.001 18 100 176 598 1055 1512 12462 12462
0.003 24 230 400 1100 2000 3500 15000 15000
Nominal pipe
DN25 DN32 DN40 DN50 DN80 DN100 DN125 DN150
diameter (mm)
-114-
Annex 6 Confirmation Form
1. Use the Confirmation table to add more secondary refrigerant

Calculate the additional amount of secondary refrigerant required according to the diameter and
length of the copper pipes.
The table below lists the formula used to calculate the additional amount of secondary refrigerant
needed for liquid copper pipes of various diameters (The amount of secondary refrigerant
required for the pipes that come with the indoor unit is already available).
Diameter of Additional amount of Length of Required amount of

copper pipe secondary refrigerant (g/m) piping (m) secondary refrigerant (kg)
6.35
9.52
12.7
15.88
19.05
22.23
Total
2. What to be confirmed before the trial run
Power off protection- current Outdoor unit A Indoor unit A

2
Power cable model Outdoor unit mm Indoor unit mm2
If the addresses of the indoor unit are properly set
If the indoor unit is powered
If the communication line is properly connected
If the manifolds are mounted as required
If the condensate water pipe of the indoor unit is clear
If the equipment is properly grounded
If the equipment is properly insulated( 10M
If the input voltage is correct (220V 10% or 380V 10%)
Check that the piping is airtight and vacuum before they are refilled
If the number of indoor units is preset using the outdoor unit controller
If the valve of the outdoor unit is opened
3. Test and maintenance record

Below are the operating parameters that must be recorded during the test.
Recorded by: Date of recording:
Suction Exhaust VoltageV Current(A) Transient heat of the Environment

pressure (bar) pressure (bar) entire equipment temperature
Record of unit maintenance

Recorded by: Date of recording:
Suction Exhaust Voltage Current Transient heat of the Environment Remarks

pressure (bar) pressure (bar) (V) A entire equipment temperature
1st
time
2st
time
3st
time
4st
time
5st
time
6st
time
-115-
REGISTERED
S&E
ISO 9002
©2003 McQuay International +1 (800) 432-1342 www.mcquay.com
PA-PAU-C001
Printing may make the products stated herein different from the actual products, please refer to the actual
products upon purchasing them.
All data has been carefully reviewed. McQuay will not bear any consequences incurred from printing errors.
Details of models, parameters, and performances are also subject to change without prior notiﬁcation. Please
refer to the product nameplates for details.
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Application Manual AM - MDS - 2006

Multi-Digital Scroll Units

Engineered for ﬂexibility and performance.

1.1 General Information

1.2 Working Principle & System Principle

1.2.1 Working Principle

This optimal force holding the 2 scrolls Orbiting scroll

==PWM valve power off ==PWM valve power on

1.2.2 Sketch Map of Installation

Resident system Commerce system

1.2.3 Diagram of the Unit System

Note: The MDS030A unit excludes the reservoir.

Note: The MDS030AR unit excludes the reservoir.

1.3 Main Features

1.3.1 Wide Range and Stepless Capacity Modulation

1.3.2 Accurate Temperature Control and Quick Response.

1.3.3 Simple, Reliable and Long Life

1.3.4 Energy Saving

1.3.5 Flexible Combination of Indoor Units

1.3.6 Reliable Long Piping Connection Design

Max. piping total Max. piping Height(m)

1.3.7 Space Saving

Traditional central air conditioning MDS system

1.3.8 Easy to Install and Simple to Maintain

Indoor unit: ceiling cassette Matching outdoor units: MDS series

Cooling capacity No. Power supply features: A:220V/50Hz

Design serial No. Design serial No.

Power supply features:220V/50Hz Cooling capacity No.

Design alternation No. McQuay

Indoor unit: ceiling concealed unit

Design serial No. Design alternation No.

Type of connecting pipe: Matching outdoor units:

Air return mode: Power supply features:

Hot water heater box

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

T means that unit can be used in MCCTseries

Hot water heater box

Electric heater box

18-15 means it can be used in MCC008/010/015T

T means the unit can be used in MCCTseries

Air-cooled cooling duct indoor unit

Design serial No.

Cooling capacity No.

Air-cooled cooling duct indoor unit

Indoor unit: Wall Mounted Indoor Units

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

Outdoor unit: MDS unit

Description of the unit

Design serial No.

Cooling capacity No.

McQuay multi digital scroll unit

MEX throttle box

Design serial No.

Valve opening size No. Pipe mode