McQuay MDS030AR, MDS040AR, MDS050AR, MDS060AR, MDS080R Design & Installation Manual

...

Design & Installation Guide For McQuay MDS Multi System

Engineered for flexibility and performance.

is a registered trademark of McQuay in the United States and other countries, licensed and recognized all over the world. Without prior written consent of McQuay, use of the above-named trademark for business purposes may constitute a violation of the federal and state laws in the Unites states and laws of related countries, and remain subject to a charge of trademark infringement and unfair competition.

This manual is prepared by the Market Department of McQuay ’s Shenzhen-based factory. Pursuant to the copyright law, this manual may not be reproduced or otherwise distributed in whole or in part without prior written permission of McQuay.

We have used our best endeavor to make sure the information contained in this manual is accurate. As we are always committed to technological improvement, any change in the units and specifications is subject to 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

Foreword

1. Overview

1.1 General Information………………………………………………………………………………4

1.2 Working Principle & System Principle…………………………………………………………4

1.3 Main Features……………………………………………………………………………………11

1.4 Nomenclature……………………………………………………………………………………13

1.5 Products Series…………………………………………………………………………………15

1.6 Performance Parameter…………………………………………………………………………16

1.7 Operating Range…………………………………………………………………………………20

1.8 Refnet………………………………………………………………………………………………20

1.9 Outline of Indoor Units…………………………………………………………………………22

1.10 Outline of Outdoor Units………………………………………………………………………28

2. Unit Control

2.1 Introduction of the Controller……………………………………………………………………34

2.2 Main Functions……………………………………………………………………………………34

2.3 Operation of the Controller………………………………………………………………………35

2.4 Software Management System…………………………………………………………………39

2.5 Network Central Control…………………………………………………………………………41

2.6 Wiring Diagram……………………………………………………………………………………42

2.7 Electric Connection………………………………………………………………………………56

2.8 Electric Data……………………………………………………………………………………58

3. Selection

3.1 Load Calculation…………………………………………………………………………………59

3.2 Selection of Indoor Units………………………………………………………………………61

3.3 Selection of Outdoor Units……………………………………………………………………63

3.4 Design of Air System……………………………………………………………………………66

3.5 Selection of Refnet Joint………………………………………………………………………71

4. Installation

4.1 Installation of Indoor Units………………………………………………………………………75

4.2 Installation of Outdoor Units……………………………………………………………………82

4.3 Refrigerant Pipe & Installation…………………………………………………………………87

4.4 Design, Processing and Installation of Condensate Pipe…………………………………102

5. Testing

5.1Hardware Diagram and Equipment………………………………………………… 106

5.2 Running……………………………………………………………………………………………113

6. Servicing and Maintenance

6.1 Notice to the Customer…………………………………………………………………………114

6.2 Maintenance………………………………………………………………………………………115

7. Troubleshooting…………………………………………………………………………………119 Annexes…………………………………………………………………………………………………121

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Design & installation Guide For McQuay MDS Multi System

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 undoubtedly 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.

C H A P T E R

Overview

1.1 General information

1.2 Working principle & system principle

1.2.1Working principle

The beauty of this technology is its inherent simplicity. The standard digital scroll compressor has

a unique feature called axial compliance. This allows the fixed scroll to move in the axial direction, by very small amounts, to ensure that the fixed and orbiting scrolls are always loaded together with the optimal force.

This optimal force holding the 2 scrolls to-

gether at all operating condi tions ensure 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% (Figure 3). If for the same cycle time, the loaded state time is 15 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.

fixed scroll

(movable in axial direction)

PWM vale

Orbiting scroll

(Rotatable in radial direction)

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Design & installation Guide For McQuay MDS Multi System

■ PWM valve power off

■ Valve close

■ Fixed scroll move downwards

■ Two scrolls gather together

■ Loading

■ PWM valve power on

■ Valve open

■ Fixed scroll moves upwards

■ Two scrolls separate

■ Unloading

Resident system Commerce system

1.2.2 Installation sketch map

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Design & installation Guide For McQuay MDS Multi System

MDS030AR、MDS040AR、MDS050AR、MDS060AR

1.2.3 System principle

MDS030A、MDS040A、MDS050A、MDS060A

Note: MDS030AR unit excludes the reservoir.

Note: MDS030A unit excludes the reservoir.

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Design & installation Guide For McQuay MDS Multi System

MDS080R、 MDS100BR、MDS120BR

MDS150BR

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Design & installation Guide For McQuay MDS Multi System

MDS200BR、MDS220BR、MDS240BR

MDS180BR

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Design & installation Guide For McQuay MDS Multi System

MDS280BR、MDS300BR

MDS260BR

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Design & installation Guide For McQuay MDS Multi System

1.3 Main features

1.3.1 Wide range and stepless capacity modulation

■ Wide capacity modulation range（10%-100%) ；

■ According to changing the ratio of “loading time”and “unloading time, MDS can modulate the capacity steplessly；

■ Lower the energy consumption and running cost.

1.3.2 Accurate temperature control and quick response.

■ The cooling/heating capacity of the indoor units is controlled by the EXV,

which ensure the low temperature fluctuation of ± 0.3℃;

■ Stepless capacity modulation;

■ Quick response to output the capacity (40s).

1.3.3 Simple, reliable and long life

■ The PWM valve has the longevity of 40 million times

■ Wide range of capacity modulation makes sure

the start/stop times reduces

■ Less components

■ No complicate inverter controller

■ The compressor has an excellent oil return

performance, there is no need for the oil return circuit

■ Even the units run in 10% part load, the MDS system can be in good stage.

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Design & installation Guide For McQuay MDS Multi System

【Note】OT: outdoor unit is above indoor unit; IT: Indoor unit is above outdoor unit

Height Max. accessory Max. accessory

Height

pipe length pipe length

OT IT

12～30HP 350 150 50 40

10HP 250 125 50 40

8HP 250 125 50 40 6HP 150 70 30 30 5HP 150 70 30 30 4HP 150 70 20 20 3HP 100 50 20 20

1.3.4 Energy saving

■ The inverter system’s capacity modulation range is from 30% to 100%, while MDS system ’s capacity modulation range is from 10% to 100%;

■ Quick response to the capacity modulation;

■ Min. power consumption is only 10% of the full load power consumption;

■ Compared to t he 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

■ The max. capacity of the indoor units is as 130% as the outdoor units capacity;

■ The outdoor unit can connect different numbers of indoor units according to the outdoor unit

capacity;

■ One outdoor unit can be connected up to 48 indoor units;

■ Various types of indoor units are available;

■ There are various indoor units for option: concealed exposed, ceiling concealed, high static

pressure fan coil and ceiling exposed/floor standing.

1.3.6 Long accessory pipe connection design

■ Max. accessory pipe length is 15m (12HP-30HP), max. height is 50m (8HP— 0HP).

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Design & installation Guide For McQuay MDS Multi System

1.3.7 Space saving

■ Compared to large size central air conditioning, MDS system is high centralized, no need for special equipment room to save more space, and bring more benefits.

1.3.8 Easy to install and simple to maintain

■ Easy installation

● With simple structure, clear piping diagram, little work amount at field installation, MDS system

is equipped with simple indoor and outdoor units and pipe connection, and it is complete with refrigerant piping system to ease the maintain.

■ Independent system, stage installation

● The easy installation makes the users to choose the suitable time to install MDS system

within longer time, which reduces the limits of period to install air conditioning at the installation.

● For new projects, the step installation can decrease the disposal investment.

● For renovation projects, the users can install the units easily.

■ No need for special maintenance

● It has only simple refrigerant piping system, no complex maintenance;

● Compared to the chilled water system, MDS system is with no water system, no piping cleaning,

no maintenance for water system control design; and MDS system is much simple so there is no need for expert people to manage and maintain it.

Traditional central air conditioning MDS system

1.4 Nomenclature

■ Indoor unit: ceiling cassette

CK 030 T -- A M A

Design serial No Cooling capacity No. Indoor unit: ceiling cassette McQuay

Design alternation No. Matching outdoor units:MDS series Power supply features:220V～/50Hz

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Design & installation Guide For McQuay MDS Multi System

■ Indoor unit: ceiling concealed unit

■ Indoor unit: Ceiling exposed/floor standing unit

M CM 050 T - A M A

Design serial No Cooling capacity No. Indoor unit: Ceiling exposed/floor standing unit McQuay

Design serial No. Matching outdoor units: MDS series Power supply features: A:220V～/50Hz

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

McQuay

Concealed exposed indoor unit

Cooling capacity No.

Design serial No.

Pipe mode:

R-right connecting pipe

L-left connecting pipe

Air return mode:

B-rear air return box

D-lower air return box

Omitted-no air return box

Design serial No.

Matching outdoor units: MDS series

Power supply features: A:220V～/50Hz

■ Hot water heater box

■ Electric heater box

08-15 means it can be used in MCC008/010/015T 18-30 means it can be used in MCC018/020/025/030T 40-50 means it can be used in MCC040/050T 60 means it can be used in MCC060T

T means that unit can be used in MCC“T”series Hot water heater box

HW T 08-15

HD P 1.2 T 08-15

18-15 means it can be used in MCC008/010/015T 18-30 means it can be used in MCC018/020/025/030T 40-50 means it can be used in MCC040～050T 60 means it can be used in MCC060T

T means the unit can be used in MCC“T”seres Heating capacity (kW)

Heating unit: P means the heating unit is PTC Omitted means the heating unit is electric heating pipe Electric heater box

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Design & installation Guide For McQuay MDS Multi System

■ Air-cooled cooling duct indoor unit

1.5 Products Series

1.5.1 Outdoor unit

Capacity range

3HP 4HP 5HP 6HP 8HP 10HP12HP 15HP 18HP 20HP 22HP 24HP 26HP 28HP 30HP

● ● ● ●

● ● ● ● ● ● ●

Model

MDS-A

MDS-B

M DB 050 T - A M A

Design serial No Cooling capacity No. Air-cooled cooling duct indoor unit McQuay

Design serial No. Matching outdoor units:MDS series Power supply features: A:220V～/50Hz

■ Outdoor unit: MDS unit MDS 60 A R - F AA

Design serial No Cooling capacity No McQuay multi digital scroll unit

Description of the unit Power supply:

A:220V～/50Hz B:380V/3N～/50Hz

Heat pump (omitted if cooling only)

_________

MEX:Throttle box (one expansion valve)

_________

ominal opening diameter value× 10

_________

2:1/4 inch

_________

3:3/8 inch

_________

4:1/2 inch

_________

Flare fitting & nipple joint

_________

Primary design

McQuay

Valve opening size No.

Pipe size:

Pipe mode:

Design serial No.

■ MEX throttle box

Design serial No. Pipe mode Pipe size:

MEX - 14 - 3 SA - A

McQuay

Valve opening size No.

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Design & installation Guide For McQuay MDS Multi System

1.6 Performance Parameter

1.6.1 Ceiling concealed

Model

Indoor MCC MCC MCC MCC MCC MCC MCC MCC MCC MCC

unit

008T 010T 015T 018T 020T 025T 030T 040T 050T 060T

Cooling

2000 2500 3650 4500 5600 6500 7800 10600 12400 14400

capacity

Heating

2200 2600 3700 4700 6100 7400 8900 11600 14500 17300

capacity

Nominal input W 47 47 81 82 82 123 158 276 276 280

Power supply 220V～/50Hz

Air

High m3/h 450 450 580 800 800 960 1200 1900 1900 2100

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)

Piping

Liquid pipe Φ

mm(in)

6.35 (1/4) 6.35 (1/4) 6.35 (1/4) 9.52 (3/8) 9.52 (3/8) 9.52(3/8) 9.52(3/8) 9.52(3/8) 9.52(3/8) 9.52(3/8)

size

Gas pipe Φ

mm(in)

9.52 (3/8) 9.52 (3/8) 12.7 (1/2) 15.88(5/8) 15.88(5/8) 15.88(5/8) 15.88(5/8) 19.05(3/4) 19.05(3/4) 19.05(3/4)

Drainage pipe

inch R3/4

Capacity range

0.8HP 1.0HP 1.5HP 1.8HP 2.0HP 2.5HP 3.0HP 4.0HP 5.0HP 6.0HP

MCC ● ● ● ● ● ● ● ● ● ●

MCK ● ● ● ● ● ● ● ●

MCM ● ● ●

MDB ● ●

Model

1.5.2 Indoor products

Notes:

◆ The nominal cooling cap acity 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 temperature or other causes.

◆ The above parameters are of heat pump parameters.

Notes:

◆ The nominal cooling cap acity is gotten in the return air temperature of 27℃ /19℃ , and the ambient temperature of 35℃ /24℃ .

◆ The nominal heating capacit y 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 temperature or other causes.

1.6.2 High static pressure duct unit

Model Indoor unit Indoor unit MDB050T MDB060T Nominal cooling capacity W 12500 14000 Nominal heating capacity W 14000 16500 Nominal input W 615 789 Power supply 220V～/50Hz Air flow(High/Medium/Low) 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 diameterΦ

mm(in) 9.52(3/8) 9.52(3/8)

pipe size Gas pipe outside diameterΦ mm(in) 19.05(3/4) 19.05(3/4)

Drainage pipe inch R3/4

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Design & installation Guide For McQuay MDS Multi System

Notes:

◆ The nominal cooling capacity is gotten in the return air temperature of 27℃ /19℃ , and the ambient temperature of 35℃ /24℃

◆ The nominal heating capacity is gotten in the return air temperature of 20℃ /15℃ , and the ambient temperature of 7℃ /6℃ .

◆ The sound level is gotten from the test room, it may differ in actual use due to the ambient temperature or other causes.

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 Power supply 220V～/50Hz Dimension mm 1214x670x214 1214x670x249 1714x670x249 Weight kg 39 44 44 Sound(High/medium/Low) dB(A) 48/45/42 50/46/43 52/48/44

Liquid pipe outside diameterΦ mm(in) 9.52(3/8) 9.52(3/8) 9.52(3/8)

PiPing

Gas pipe outside diameterΦ mm(in) 15.88(5/8) 15.88(5/8) 19.05(3/4)

Size

Drain pipe mm φ 20.5

Notes:

◆ The nominal cooling cap acity 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 temperature or other causes.

1.6.3 Ceiling cassette

Model

Indoor unit

MCK010T MCK015T MCK018T MCK020T MCK025T MCK030T MCK040T MCK050T

Nominal cooling capacity

W 2800 3600 4500 5400 6500 7500 10000 12500

Nominal heating capacity

W 3200 3900 5000 5900 7200 8000 11000 13500 Nominal input W 26 34 36 42 75 84 110 140 Power supply 220V～/50Hz

High 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 39.5 Sound(High/medium/Low)

dB(A) 29/28/26 32/30/27 38/34/30 39/35/31 42/40/38 45/43/41 46/44/42 48/45/42

Piping

Liquid pipeΦmm(in) 6.35(1/4) 9.52(3/8) 9.52(3/8)

Size

Gas pipeΦmm(in) 9.52(3/8) 12.7(1/2) 15.8(5/8) 19.05(3/4)

Drainage pipe mm φ 20.5

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Design & installation Guide For McQuay MDS Multi System

1.6.5 Specification

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 Lx W x H mm Weight

kg 82 85 112 115 117 120 123 130

Cooling rated power input

kW 3.0 3.0 3.5 3.6 4.4 4.4 5.0 5.0

Cooling rated current

A 13.6 13.6 15.9 15.9 20 20 22.8 22.8

Heating rated power input

kW - 2.5 - 3.4 - 4.2 - 4.2

Heating rated current

A - 11.4 - 15.5 - 19 - 20.3

Refrigerant

R22

Type of connecting pipe

copper f lare fitting & nipple joint

Liquid pipeф

(mm/in)

Gas pipeф

(mm/in)

Notes:

◆ The nominal cooling cap acity 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 specifications may be undated as we are trying to update the units at the time, please regard the nameplate of the unit as

standard.

840x408x900 1058x430x1044 1058x4230x1247

9.52(3/8″) 9.52(3/8″) 9.52(3/8″) 9.52(3/8″)

15.88(5/8″) 19.05(3/4″) 19.05(3/4″) 19.05(3/4″)

Notes:

◆ The nominal cooling cap acity 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 specifications may be undated as we are trying to update the units at the time, please regard the nameplate of the unit as

standard.

Connecting accessory pipe size

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 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

Gas pipe Liquid pipeф (mm/in) Gas pipe ф (mm/in)

058x430x1044 1058x430x1247

Copper flare fitting & nipple joint Copper flare fitting & nipple joint

9.52(3/8″)

19.05(3/4″)

Connecting accessory pipe size

Type of connecting pipe

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Design & installation Guide For McQuay MDS Multi System

Notes:

◆ The nominal cooling cap acity 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 temperature or

1.6.6 Specification

Model

MDS080B MDS080BR MDS100B MDS100BR MDS120B MDS120BR MDS150B MDS150BR MDS180B MDS180BR MDS200B MDS200BR

Nominal cooling

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

capacity

Nominal heating

kW - 26.0 - 30.0 - 34.0 - 43.0 - 50.0 - 53.0

capacity Power supply 380V/3N～/50Hz

Sound leveldB(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

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

power input 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

kW - 7.2 - 8.3 - 9.0 - 11.1 - 13.2 - 14.7

power input Heating rated current A - 13.6 - 15.7 - 16.7 - 22.6 - 27.1 - 29.4

Refrigerant R22

Gas side

Welding & flange

Liquid side

Flare fitting &nipple joint

Liquid pipeф

mm(in)

12.7(1/2) 15.88(5/8)

Gas pipe ф

mm(in)

28.6(11/8) 34.9(13/8)

Model

MDS220B MDS220BR MDS240B MDS240BR MDS260B MDS260BR MDS280B MDS280BR MDS300B MDS300BR

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 Lx 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

Gas side

Welding & flange

Liquid side

Flare fitting &nipple joint Liquid pipe ф mm(in) 19.05(3/4) 19.05(3/4) Gas pipe ф mm(in) 38.1(11/2) 41.3(15/8)

Connecting accessory pipe size

pipe size

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Design & installation Guide For McQuay MDS Multi System

1.7 Operating Range

【Note】The t able is gotten based on the equivalent length of 16m and the height is 0 m.

1.8 Refnet

1.8.1“Y” type

unit：mm

Length(mm) Diameter(mm) Diameter(mm) Diameter(mm)

Refnet

A B C D

E(outer

F G H

I(outer

J K L M

N(outer

O P Q R

model

diamenter diamenter diamenter

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

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Design & installation Guide For McQuay MDS Multi System

1.8.2 Distributor kit

unit: mm

Type: MDS-C1

Type: MDS-Y5

unit: mm

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Design & installation Guide For McQuay MDS Multi System

1.9 Outline of Indoor Units

1.9.1 MCK010～050T

Model A B C D E F G H I J K L M MCK010～020T

820 875 548 820 278 250 28 930 930 642 622 555 555

MCK025～050T

820 875 548 820 363 335 28 930 930 642 622 555 555

unit: mm

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Design & installation Guide For McQuay MDS Multi System

1.9.2 MDB050T

1.9.3 MDB060T

unit: mm

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Design & installation Guide For McQuay MDS Multi System

1.9.4 MCC008、010、015、018、020、025、030、040、050、060T

1.9.5 MCM020T、MCM030T、MCM050T

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

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

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Design & installation Guide For McQuay MDS Multi System

1.9.6 Auxiliary heating coil

Model A B C D HWT08-15 762 704 732 818 HWT18-30 1022 964 992 1078 HWT40-50 1372 1314 1342 1438 HWT60 1632 1574 1602 1688

unit: mm

1.9.7 Auxiliary electric heating box

unit: mm

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

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Design & installation Guide For McQuay MDS Multi System

1.10 Outline of Outdoor Units

1.10.1 MDS030A(R)

1.10.2 MDS040A(R)、MDS050A(R)

unit: mm

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Design & installation Guide For McQuay MDS Multi System

1.10.4 MDS080B(R)、MDS100B(R)、MDS120B(R)

unit: mm

1.10.3 MDS060A(R)

unit: mm

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Design & installation Guide For McQuay MDS Multi System

1.10.5 MDS150B(R)

unit: mm

1.10.6 MDS180B(R)、MDS200B(R)、MDS220B(R)、MDS240B(R)

unit: mm

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Design & installation Guide For McQuay MDS Multi System

1.10.8 MDS280B(R)、MDS300B(R)

1.10.7 MDS260B(R)

unit: mm

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Design & installation Guide For McQuay MDS Multi System

C H A P T E R

Units Control

2.1 Introduction of 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 512 units (32groups).

2.2 Main Functions

■ Cooling./heating/auto/air supply/dehumidity mode are available

■ LCD wire controller and remote controller are available

■ Digital scroll compressor is used to reduce the start/stop times

■ Electronic expansion valve is used to control the refrigerant flow

■ One outdoor unit can connect up to 48 indoor units

■ Central control is available

■ Both the indoor and outdoor units have two speeds

■ 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 F .

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Design & installation Guide For McQuay MDS Multi System

2.3 Operation of the Controller

2.3.1 Main features Both wire 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 F～30℃ /78 F.

■ 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 line controller

■ Wire controller panel button

For the unit without wind wing For the unit with wind wing

■ 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 ，cooling mode, high speed, No sleep function, no defrost, no wind wing, no electric heater. When the function of auto restart after power failure is active: the unit is the same as that before power failure.

● Temp setting

In normal mode condition, press“△”or “ ”to increase the temp by 1 ℃ or 1 Temp adjustment range is 16-30℃ (or 61-86 When the temp reach the upper limit or floor limit, the

“△”or “ ”is invalid.

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Design & installation Guide For McQuay MDS Multi System

● Temp unit setting There is a switch on the PCB board. When switch OP1 is ON, the unit is ℃; when it is OFF, the unit is Alternate method is as follows: Press“fan”key and last for 5 seconds in the normal condition, the temp unit setting will be successful and there will be a buzzer to indicate.

● Real time setting Press“CLK”to enter, the first time is week setting and indicate its icon, press “△”or

“ ” to adjust the week from Sunday to Saturday while the real time does not change. If

there is no press on any key within 5 seconds, the unit will exit from the real time setting and back to the normal status. If you press“CLK”one more time within 5 seconds, the setting will be OK and it is the real time setting icon, as well as the light is twinkling. At this time, you can press “△” to increase the hour while press “ ” to increase the minute. If there is no press on any key within 5 seconds, the unit will exit from the real time setting and the time setting is valid. If you want to confirm the setting, you need to press“CLK” one more time. If any other key is press during the setting, the system will exit and back to the normal condition without saving

● Mode setting When the unit is in off status, you can press “mode”to enter and the current mode is twinkling. The mode will be changed when you press “mode” one more time. The mode changing sequence is as follows: When outdoor unit is OFF: Heat pump: Cooling ,heating, air supply, dehumidifying, cooling Cooling only: Cooling, air supply, dehumidifying, cooling When outdoor is in cooling condition: Cooling, air supply, dehumidifying, cooling When outdoor is in heating condition: Heating, air supply, heating

Note: In one system, the follows are not available: some units are in cooling condition while the

other is in heating condition.

● Air flow setting In normal condition, when the“fan”key is pressed, the air flow will be changed as the following sequence: High, auto, low, medium, high. When the unit is in air supply condition, there is no “auto”function.

● Sleep Press “sleep” key, the icon will be ON or OFF.

● Setting of auto restart after power failure There is a switch on the PCB board to fulfill the setting of auto restart after power failure. When OP2 is set “ON”, then this function is active and the icon is shown on the LCD.

● Manual defrost When the unit runs in heating mode condition, press “Heater” key and last for 5 seconds, you will enter “manual defrost mode” and “Defrost mode” is shown on the LCD. When it is auto defrost, “Defrost mode” is also shown on the LCD and it will disappear when the defrost finishes.

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Design & installation Guide For McQuay MDS Multi System

● Timer setting Press “Timer ” to enter timer setting (When the unit is ON, it can only be set to OFF; When the unit is OFF, 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“△”or “ ”to increase the hour while press“△”or “ ”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 settingfunction is cancel. When you need the timer setting function, you need to reset.

● Keyboard locked and unlocked setting Press “Sleep” and last for 5 seconds, the keyboard will be alter between locked and unlocked. When it is locked, a icon will be shown on the LCD. During the locked stage, only the ON/OFF keyboard is valid.

● ON/OFF setting Press “ON/OFF”keyboard, the unit will be alter between ON and OFF, and a relative icon will be shown on the LCD.

● Reset This keyboard is used to restart the unit because of some uncertain factors.

● Remote controller The remote controller can be used with the wire controller and it and it has the same keyboard as the wire controller, But the keyboard “fan”, “sleep”, “ heater”do not have the second function.

● Central control

The units can be central controlled by the computer or centralized controller. When it is locked, the keyboard on the wire controller is invalid and the key icon is twinkling. It can only be unlocked by the computer or by the centralized controller. When it is central control, the wire controller can communicate with the computer and the centralized controller.

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Design & installation Guide For McQuay MDS Multi System

2.3.3 Wire control panel

2.3.4 Outline dimension

2.3.5 Installation type

■ concealed installation

Unit：mm

For three speed unit with auxiliary heater

For single speed unit with auxiliary heater

For three-speed unit with wind wing

For the cooling and heat pump unit with three-speed

For the cooling and heat pump unit with single-speed

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Design & installation Guide For McQuay MDS Multi System

2.4 Software Management System

2.4.1 Real-time monitor software

■ System monitor software: The real time monitor software of MDS unit can perform such

functions as indoor monitor, system monitor and service monitor, for the purpose of making the user or service test personnel see the detailed parameters and know the operation of the unit.

Main control function:

2.4.1 Real-time monitor software

Indoor monitor

■ Set indoor mode/wind speed/auxiliary setting/temperat ure and ON/OFF (they can be set in many units or the units in groups 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 monitor

Display the model and status of all indoor units in the system (such as alarm and timer)

Indoor icon instruction

Small icon

Introduction

Introduction of the units

Indoor

Icon

unit model

Stop: Cooling Heating Dehumidity Air vent

MCC

MCK

MCM

MDB

The timer function has been started.

The line controller has been locked, we can not use it to control the indoor units at this time.

There is malfunction in this indoor unit, double-click the icon to know the details.

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Design & installation Guide For McQuay MDS Multi System

2.4.2 User-specific biller

■ Based on real-time monitoring, McQuay has created user-specific billing software. With the technology of accurate flow control, this software makes the calculation of power consumption more reasonable. It also enables users to group up to 1536 indoor units at random, and to calculate the electricity charge accurately in real time. It features great flexibility, allowing you to easily change and group devices and statistics. This software is also capable of charging power consumption at wave crests and wave troughs on a time-specific basis. Whenever a user becomes delinquent, the real -time monitoring software is capable of blocking the user without affecting other users. In this way, it helps ease your management.

2.4.3 Unit type selection software

■ The type selection software developed depending on different unit models allows you to select and verify the unit model as required by customers, and collect statistics on the models of indoor/ outdoor units as well as the quantity of refnet and copper pipes. In this way, unit design and type selection are as easy as a single click.

■ Loop monitor* Select and see the outdoor unit system figure, operation parameters and operation parameters of all indoor

■ Service monitor* Display the current operation parameters and history record curve of indoor outdoor unit inthe system.

Note: the interface can be used by the authorized maintenance personnel.

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Design & installation Guide For McQuay MDS Multi System

2.5 Network Central Control

■ One outdoor unit can control up to 48 indoor units, and the central controller can control up to 32 outdoor units. The monitor software can perform the real time control up to 1536 (32*48) units at the same time. The connection cables for outdoor and indoor units are very simple. MDS system is equipped with strong alarm display and inquiry function to save the time and cost of maintenance.

■ 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.

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Design & installation Guide For McQuay MDS Multi System

2.6 Wiring Diagram

2.6.1 Wiring diagram of the indoor unit

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

■ Model MCK010/015/018/020T

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Design & installation Guide For McQuay MDS Multi System

■ Model MCK025/030/040/050T

■ MCM020/030T

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Design & installation Guide For McQuay MDS Multi System

■ Model MCM050T

■ Model MDB050/060T

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Design & installation Guide For McQuay MDS Multi System

2.6.2 Wiring diagram of outdoor units

■ Model MDS030A

■ Model MDS030AR

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS040AR

■ Model MDS040A

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS050A

■ Model MDS050AR

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS050AR

■ Model MDS060A

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS060AR

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS080/100/120B

■ Model MDS080/100/120BR

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS150B

■ Model MDS150BR

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS180B

■ Model MDS180BR

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS200/220/240B

■ MDS200/220/240BR

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS260BR

■ Model MDS260/280/300BR

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Design & installation Guide For McQuay MDS Multi System

■ Model MDS280/300BR

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Design & installation Guide For McQuay MDS Multi System

2.7.2 MDS050A/AR、MDS060A/AR

2.7 Wiring Diagram

2.7.1 MDS030A/AR、MDS040A/AR、MDS050A/AR

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Design & installation Guide For McQuay MDS Multi System

2.7.3 MDS080～240B/BR

2.7.4 MDS260～300B/BR

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Design & installation Guide For McQuay MDS Multi System

Note:

■ All the wiring should be fixed;

■ Electric wiring must not touch the refrigerant pipe, compressor and moving parts of the 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.

Model MCM020T MCM030T MCM050T

Power supply 220V～/50Hz

Cross section area(mm2) 2.5

Q.T.Y 3

Power cable

2.8.5 Indoor unit（MCM）

2.8.4 Indoor unit（MDB）

Model MDB050T MDB060T

Power supply 220V～/50Hz

Power

Cross section area(mm2) 2.5

Q.T.Y 3

cable

Model MCC025T MCC030T MCC040T MCC050T MCC060T

Power supply 220V～/50Hz

Cross section area(mm2)

2.5

Q.T.Y 3

Power cable

Model MCC008T MCC010T MCC015T MCC018T MCC020T

Power supply 220V～/50Hz

Cross section area(mm2)

1.5 2.5

Q.T.Y 3

2.8.2 Indoor unit（MCC）

Power cable

2.8 Electrical Date

2.8.1 Outdoor unit（MDS）

Model

MCK010T MCK150T MCK180T MCK020T MCK025T MCK030T MCK040T MCK050T

Power supply 220V～/50Hz

Power

Cross sectionarea(mm2)

1.5 2.5

Q.T.Y 3

2.8.3 Indoor unit（MCK）

cable

Model

MDS220B/ MDS240B/ MDS260B/ MDS280B/ MDS300B/

MDS220BR MDS240BR MDS260BR MDS280BR MDS300BR

Power supply 380V /3N～/50Hz

Cross section area(mm2)

10 16

Q.T.Y 5

Power

Model

MDS080B/ MDS100B/ MDS120B/ MDS150B/ MDS180B/ MDS200B/

MDS080BR MDS100BR MDS120BR MDS150BR MDS180BR MDS200BR

Power supply 380V /3N～/50Hz

Cross section area(mm2)

6 10

Q.T.Y 5

Power cable

Model

MDS050A/MDS050AR MDS060A/MDS060AR

Power supply 380V /3N～/50Hz

Cross section area(mm2) 4(2.5)

Q.T.Y 4(1)

Power cable

Model

MDS030A/MDS030AR MDS040A/MDS040AR MDS050A/MDS050AR MDS060A/MDS060AR Power supply 220V～/50Hz Cross section area(mm2)

6(2.5)

Q.T.Y 2(1)

Power

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Design & installation Guide For McQuay MDS Multi System

Selection

C H A P T E R

3.1 Load Calculation

3.1.1 Planning and cooperation McQuay recommends you to estimate and plan the following information before engineering.

■ Based on the air conditional area function, calculate out the cooling/heating load (depending

on the temperature,humidity, and ventilation).

■ Query related meteorologic information, especially the sun light, wind direction in winter and

summer, the ambient cooling/heating sources, and other external factors that may affect the running of the units. Then decide the place and azimuth to place the units based on the environmental factors favoring the normal running of the units. For the outdoor meteorologic parameters of each city in China, see “Appendix 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 construction organ in this area.

■ Make 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 figures of the design. Confirm or decide the specifications and the unit model.

3.1.2 Cooling load calculation

■ The cooling load of the air conditioning area is decided by the real-time maximum cooling load

or accumulated calculated cooling load of each room based on the area, height, and usage of the room serviced. It is also affected by the additional cooling load caused by the ventilator blower, the exhauster, and the air pipe system. In practice, it is calculated as follows:

total

= F1q1 + F2q2+… + Fnq

Where, F1 is the air conditioning area of each calculated unit. Its unit is m2. q1 is the cooling load per unit area of each calculated unit. Its unit is W/m

■ Appendix 2 lists out the estimated indexes and design parameters for 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 Appendix 2), the heating load of the building is as follows:

Q = Fq

Where, F is the construction area. Its unit is m

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Design & installation Guide For McQuay MDS Multi System

■ If we know the heat performance index qv[W/(m3 . ℃)] and outside volume V (m3), we can calculate the heating load as follows: Q

total

= aqvV( tn– tw) 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. Its unit is m2. (tn – tw) is the calculated difference between the indoor and outdoor temperatures. Its unit is℃.

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

【Notes】

■ During selection, you must consider the attenuation of the following factors to the cooling and heating effects: 1)

the length of the pipe connecting the indoor unit and outdoor unit; 2) the difference between the actual temperatures of the indoor and 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 for areas north to Yellow River, inadequate heating capacity must be compensated

with a model with an auxiliary electric heater or hot-water heater.

■ The MDS unit is designed following GB/T 18837-2002. There is a negative difference between the actual cooling capacity and the rated capacity, about 5%. Therefore, you must pay enough attention to this factor and keep the cooling capacity a certain security level.

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 5～10 3.38 Office 5～10 0.53 18 Workshop 11～20 2.73 14 building 11～15 0.49 21～30 2.04

＞15 0.56 ＞ 31 1.45

≤5 0.72 ≤ 0.5 2.30

Club 5～10 0.65 16 Equipment 0.6～1.0 0.82 12

＞11 0.58 room 1.1～2.0 0.71

＞2.1 0.50

≤5 0.81 ≤ 0.5 0.83

Hospital 6～10 0.75 20 0.6～1.0 0.72 18

11～15 0.67

Auxiliary room

1.1～2.0 0.56

＞16 0.64 ＞ 2.1 0.51

≤5 0.92

～10 0.82 ≤ 2.0 0.72

Cinema 11～15 0.79 14 Engine 2.1～5.1 0.63 15

16～20 0.70 house

＞5.1 0.60

21～30 0.65

＞31 0.61

≤5 1.22 ≤ 5.0 1.49

Public area 6～10 1.14 14 Bathroom 5.1～10.0 1.38 25

＞11 1.05 ＞ 10 1.25

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Design & installation Guide For McQuay MDS Multi System

3.2 Indoor unit selection

■ 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.

3.2.1 The selection of ceiling concealed and duct unit

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 heating capacity is obtained in the standard condition. When the units run in nonstandard condition, the actual cooling capacity and the actual heating capacity are different from the nominal cooling capacity and the nominal heating capacity.

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Design & installation Guide For McQuay MDS Multi System

3.3 Selection of Outdoor Units

For the combinations allowed, please refer to the "Indoor unit total capacity indexes” table. The standard combination is the one with which the total indoor unit capacity is most proximate

to but less than 100% of the capacity of the outdoor unit combination.

3.3.1 Capacity indexes of outdoor units

3.3.5 Capacity indexes of indoor unit (MDB)

Unit spec 050 060

Capacity index 125 140

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

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

Indoor unit combination rate

Outdoor unit

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

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Design & installation Guide For McQuay MDS Multi System

3.3.6 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 rated 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. Its unit is 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.

3.3.7 Change of cooling 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.

3.3.8 Change of heating capacity (3-30HP)

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3.3.10 Temperature-related heating capacity correction factors

3.3.9 Temperature-related cooling capacity correction factors

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Design & installation Guide For McQuay MDS Multi System

3.4 Design of Air System

The air cooled pipeline unit is an important and complex part of the air system. The air system must be designed in compliance with Design Code for Heating, Ventilation and Air Conditioning and Code of Design on Building Fire Protection.

The air pipe diameter, processing, air outlet, muffling static pressure box, fire protection valve, insulation and indoor airflow layout must be designed professionally and well implemented, so as to achieve an ideal effect of comfortableness and energy saving. The following information or data is a reference for users to design.

3.4.1 Design of the input air, 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 comfort 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 use 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 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 fit-up art.

● Common types of the air outlet

◆ Side air outlet

The shutter air outlet is generally used. The shutter can be louver shutter through which the air flow and direction can be adjusted. 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 electronic computer room.

■ Air flow pattern

No. Range Advantages and disadvantages

Return air flow pattern

Side air supply upper air return

Upper air supply upper air return

Side air supply side air return

The room with low floor height

The room with low floor

height or large depth

The room with high floor height and only for cooling in Summer

Staffs are in the return air flow area, the fan coil of the unit does occupy the indoor space in the corridor, and the air vent can be adjusted freely.But, short-flow may occur easily.

Staffs are in the return air flow area, need for little or no space, and the air vent can be adjusted freely. But, the exposed ceiling in the room has two difference heights or there are two exposed ceilings.

The fan coil of air pipe in the exposed ceiling makes the fit-up easy. But, higher floor height is required and certain exposed ceiling space is occupied.

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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, or the air volume will be too large or

small causing the unit faulty.

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 at the farthest point of the air pipe or the 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.

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

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● Check the air speed according to the actual pipe diameter, and calculate the actual speed, which should not larger than the recommended value in the design manual.

● Select the loop of most resistance and that of minimum resistance, and then calculate the frictional resistance and local resistance loss of each pipe segment.

● Check the unbalance ratio of the loop of most resistance to that of minimum resistance must be less than 15%. Otherwise, redesign the air pipe system, or satisfy the balance ratio requirements by adjusting with the valve.

3.4.3 Air pipe design To improve the operational efficiency of air conditioning, carefully consider and fully install such

fittings as material, adjustment valve and fire protection valve.

■ Material of the air pipe

The air pipe is always made from metal material, such as sheet steel, galvanized sheet or aluminum

sheet. It also can be made from non-metal material, such as hard polyvinyl chloride, glass reinforced plastic or other composite materials. The air pipe in the construction space or duct channel also can be used according to the actual conditions. The air pipe surface should be polished, straight and smooth. Some air pipes should even be painted. The air duct channel should be waterproofed. The air pipe in the room with corros ive gas may be made from glass reinforced plastic or plastics and tightly sealed.

■ Air pipe shape

● The cross-section of the air pipe is generally rectangle or round. It also can be designed to ellipse,

semicircle or spiral.

● The round air pipe has the advantages of high strength and low material loss, but it occupies large useful space and its elbow and tee should be of long distance. Generally, the flexible round air pipe is used for the new air pipe, small volume air refnet joint (such as in toilet with small area).

● The rectangle air pipe occupies small space, and is easy to install and neat for surface mounting. It has been widely applied.

● For the convenience of mechanical processing of the air pipe and flange and configuring standard valves, try to improve the utilization of the air pipe cross section. The air pipe dimension should be designed according to Calculation Form of National Universal Air pipe. The ratio of the height of the rectangle air pipe to its width should be less than 4, based on the outer diameter or length of external sides. The following table shows the standard specifications of the air pipe.

Specifications of the round air pipe

Diameter of the air pipe

Basic series Auxiliary series Basic series Auxiliary series Basic series Auxiliary series

100 80/90 320 300 900 850 120 110 360 340 1000 950 140 130 400 380 1120 1060 160 150 450 420 1250 1180 180 170 500 480 1400 1320 200 190 560 530 1600 1500 220 210 630 600 1800 1700 250 240 700 670 2000 1900 280 260 800 750

The high-speed air pipe is generally round spiral pipe with a larger thickness.

unit: mm

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 rectangle air pipe

unit: mm

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■ 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 Condition- ing 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 0.5–0.75 g/ kg. According to the allowed density of this gas (see the following table), you can use the overall ventilation volume defined in the Industrial Ventilation to calculate the volume of fresh air needed to eliminate it.

■ Elbow

The rectangular air pipe can be inner-arc or inner-slanting, as shown in Figure 4-2. When the longest side is 500 mm or longer, a flow deflector must be used.

■ Wall thickness of the air pipe The wall thickness directly relates to the effect and life of the pipe. A too thin wall will cause unstable installation, and thus the pipe will sway within a large range to increase the noise. Even worse, the friction might compound the problem, shortening the service life of the air pipe or even the entire air conditioning system.

Air pipe elbow

≤320 340～450 480～630 670～1000 1120～1250 1320～2000

Low-speed air pipe 0.5 0.6 0.8 1.0 1.2

High-speed air pipe 0.8 0.8 0.8 1.0 1.2 Round air pipe 0.5 0.6 0.8 1.0 1.2 Connection mode Insertion Flange

Unit: mmRecommended thickness of steel air pipes and accessories

Diameter of round air pipe or length of the longest side of rectangular air pipe

Rectangular air pipe

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Acceptable (CO2) density

Room type

Acceptable CO2 density

L/m

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 (governmentagency)

Place where people stay for a short time

2 3.0

In actual practice, the fresh air volume is generally 30 m2/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 7–15 m2/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 need to be careful in deciding it.

● Supplementary of air discharge When the air conditioned room has an exhaust system, the air conditioning system must have corresponding fresh air volume to complement the exhaust volume. Generally, it is recommended to use an exhaust volume that is 80% of the fresh air volume for comfortable air conditioning.

● Keeping the air conditioned room in “positive pressure” To prevent outside air (those from outdoor and adjacent rooms with less strict air conditioning requirements) from penetrating the room and affecting the temperature/humidity or the cleanness of the air conditioned room, the air conditioning system needs to use a certain volume of fresh air to keep the room in “positive pressure”, that is, the atmospheric pressure of the room is higher than that of outside). Generally, the indoor positive pressure is 5–10 Pa. Too high positive pressure not only is a waste, but also makes the system run less costeffectively. 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 keep out 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 and 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 Appendix 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 organization and the blownin air flow.

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3.5 Refnet joint selection

3.5.1 Copper pipe selection ( MDS100BR )

■ Diameter of the main pipe and that of the remotest pipe(equivalent length<90m) Main pipe：φ 12.7/ φ 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: φ 12.7/ φ 25.4 Diameter of A-D: φ 9.52/ φ 19.05

■ We can use the same method to select the pipe diameter of downstream B and D. Diameter of B-C: φ 9.52/ φ 19.05 Diameter of D-E: φ 9.52/ φ 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

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The following tables show the refrigerant copper pipe dimension specifications.

8.0HP

12.0HP

15.0HP/18.0HP 22.0HP 26.0HP/28.0HP

Specification 10.0HP 20.0HP 24.0HP 30.0HP

Between the outdoor unit and the first tap joint

Liquid pipe

φ12.7mmxt1.0 φ 15.88mmxt1.2 φ 15.88mmxt1.2 φ 19.05mmxt1.2 φ 19.05mmxt1.2

Gas pipe

φ28.6mmxt1.2 φ 28.6mmxt1.2 φ 34.9mmxt1.4 φ38.1mm xt1.6 φ41.3mmxt1.6

Between the tap joints

<15kW φ 9.52mm x t0.8

15kW～22.5kW

φ12.70mm x t1.0

22.5kW～50kW

φ12.77mm x t1.0

φ15.88mm x t1.2

50kW～85kW －－－ φ19.05mm x t1.2

<9.0kW φ15.88mm x t1.2

9.0kW～15kW φ 19.05mm x t1.2 15kW～21kW φ25.40mm x t1.2 21kW～31kW φ28.06mm x t1.2 31kW～39kW －－ φ 31.75mm x t1.4 39kW～50kW －－ φ 34.9mm x t1.4 50kW～69kW －－－ φ 38.1mm x t1.6 69kW～85kW －－－－ φ41.3mm x t1.6

Between the tap joint and the indoor unit The indoor unit to which the pipe is connected. Consistent to the indoor unit port The indoor unit to which the pipe is connected. Consistent to the indoor unit port

Specification

3.0HP 4.0HP/5.0HP 6.0HP

Between the outdoor unit and the first tap joint

Liquid pipe φ 9.52mmxt0.8 φ 9.52mmxt0.8 φ 9.52mmxt0.8

Gas pipe φ 15.88mmxt1.2 φ 19.05mmxt1.2 φ 19.05mmxt1.2

Between the tap joints

<16kW φ 9.52mm x t0.8

16kW～22.5kW －－－

>22.5kW －－－

<9.0kW φ 15.88mm x t1.0

9.0kW～16kW φ19.05mm x t1.2 16kW～21kW －－－

>21kW －－－

Between the tap joint and the indoor unit

<4kW φ 6.35mm x t0.7

≥ 4kW φ 9.52mm x t0.8

<2.8kW φ9.52mm x t0.8

2.8kW～4.5kW φ 12.70mm x t1.0

4.5kW～8kW φ15.88mm x t1.2 >8kW φ 19.05mm x t1.2

For MDS-A series

For MDS-B series

Outdoor unit capacit

Liquid

pipe

Gas pipe

Total capacity of the indoor unit to which the pipe is connected.

Liquid

pipe

Gas pipe

Total capacity of the indoor unit to which the pipe is connected.

Liquid pipe

Total capacity of the indoor unit to which the pipe is connected.

Outdoor unit capacit

Liquid

pipe

Gas pipe

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Design & installation Guide For McQuay MDS Multi System

Unit: mm

Refnet

Length (mm) Diameter (mm) Diameter (mm) Diameter (mm)

joint type

A B C D

E(outer

F G H

(outer

J K L M

(outer

O P Q R

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

Refnet joint type selection

Y type

Type: MDS-Y5

Unit: mm

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Unit: mm

Type：MDS-C2、MDS-C3

Type : MDS-C1

Unit: mm

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Design & installation Guide For McQuay MDS Multi System

Installation

C H A P T E R

4.1 Indoor unit installation

4.1.1 Ceiling cassette

Do not install the indoor unit in a location where it will come into contact with the following elements: uneven circled air, saline gas, sulphide gas, machine oil, moist air and the place which can't support the weight of the unit.

■ Investigation before installation

● All field wiring must be installed in accordance with the local wiring regulation.

● Ensure that the rated voltage of the unit responds to that of the nameplate before

commencing wiring work according to the wiring diagram

● Make sure the installation of electrical circuitry, refrigerating pipe and drain pipe convenient;

● No obstacle should be near the inlet and outlet of the indoor units in order to ensure the air

flow smoothly;

● Please refer to the following drawing for the installation:

● If the unit is installed as per above requirement, the system will have a good performance.

Or there will be some bad effect on the performance to some extent;

● In order to avoid the vibration and reduce the sound level, the base must be strong enough to support 4 times of the unit's weight.

● The unit should be installed horizontally and make sure the ceiling has no more than 350mm height for the installation.

■ Installation method

● Indoor unit must be far away from the heating source and gas source;

● Measure and mark the location of unit, then make hole in the ceiling, and install the hanging pole;

● The dimension of the installation paper can be changed with the variation of temperature and

humidity, please measure it before use;

● The installation paper should have the same size as the outlet of the ceiling hole; Please put installation paper on the indoor unit before the decoration is finished.

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● Make sure the distance between two Suspenders is 620.4mmX790.0mm;

● Use nut, Plat gasket and spring gasket to hang the unit though the suspender;

● Adjust the distance between the bottom surface of unit and ceiling to be 35.0mm;

● Make sure the installation of indoor unit is horizontal, and then tighten the nut;

■ Drainage pipe test

● Drainage pipe must be smooth, and it should have a downward slope to make the condensated

water discharge fluently

● The drainage pipe should not be installed up and down.

● When connecting the drainage pipe, do not give outside force to the unit in order to protect the

unit.

● A hose with 20mm diameter should be used to connect the inside and the outside of the drainage pipe.

● Insulated material (polyethylene with 8mm thickness) should be used to prevent the drainage pipe from sweating.

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● Connecting the hose to the drainage pipe of outdoor unit;

● Pour the water through the water inlet port and check if there is any water leakage;

● When the test is finished, connect the other side of the hose to the drainage pipe of the indoor

unit.

● The unit must be installed horizontally in order to prevent the water leakage and condensated water from generating.

■ Installation of front panel

● There is only one direction to install the front panel, which depends on the position of

indicator light and motor wiring;

● The installation paper must be taken away before the installation of front panel;

● Open the two bolts of the front grille, then take out the filter and front grille;

● Tighten the front frame to the indoor unit with four bolts and flat gasket and screw it to a

tight extend, which can prevent the air leakage;

● Connecting the indicator light and motor wiring to the indoor unit (wire controlling type without indicator light connecting wire).

【Note】Fix the front frame to avoid cooling leakage, which may cause water to coagulate and generate water drop.

【Note】This type of units adopts drainage pump to drain condensate water, and installing the unit horizontally is

to avoid water leakage and coagulation.

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■ Grille installation

● Put the air filter into the its frame before install the grille first,

● Then put grille to the front panel;

● Please note that the white side of the air filter should

face its frame;

● When decide the front grille installation direction, please consider if it easy to open the front grille.

● After the air filter has been used for 6 months or the color has turned to yellow, the air filter is invalid.

● The user can choose to install it or not

4.1.2 ceiling concealed

● All field wiring must be installed in accordance with the local wiring regulation.

● Ensure that the rated voltage of the unit responds to that of the nameplate before commencing

wiring work according to the wiring diagram

● Make sure the installation of electrical circuitry, refrigerating pipe and drain pipe convenient;

● No obstacle should be near the inlet and outlet of the indoor units in order to ensure the air flow

smoothly;

● Make sure the suspender is strong enough to support the unit, locate the suspender's position and check if it is installed correctly. Please refer to the following when considering the drainage pipe’s slope.

Note:

In order to keep the unit runs in a good condition, the air inlet port should be at least 3m from the coil.

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● Some units need an electronic expansion valve box (throttle box) for condensate pipe installation, as shown in the right figure:

Figure 1 Vertical pole mounting

Note: The electronic expansion valve box of the indoor unit must be placed in the throttle box and installed in an appropriate position of the liquid pipe. In the installation, make sure the electronic expansion valve is upright and cabled properly in the indoor unit module, and the throttle box is installed within the cable range (less than or equal to 10 m) of the electronic expansion valve as shown in the upper right figure. As the throttle box may cause noise, take some proper sound insulation measures for the throttle box in the installation, or put the throttle box within the area where the noise is acceptable according to the electronic expansion valve cable length or move it to the area without strict noise requirements.

Refer to and select the following installation modes (make sure it is installed upright firmly and reliably as shown in the diagram.

Figure 2 Horizontal rod mounting

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

MWM008/010/015

MCC008/010/015 MEX-14-2SA-A

MCK010/015

MWM020 MEX-18-2SA-A MWM025

MCC018/020/025

MEX-18-3SA-A

MCK018/020/025

MCM020

MCC030/040/050/060

MCK030/040 MEX-24-3SA-A

MCK030 MCK050

MEX-30-3SA-A

MCM050

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4.1.3 High static pressure duct unit

■ In order to keep the unit runs in a good condition, the air inlet port should be at least 3m.

■ Soft connecting joint should be used to reduce the sound level and the vibration.

■ Condensated water pipe should have a slope with no less than 0.5%~1%, and it must be

insulated.

■ Condensate water pipe should have a trap. The trap should be PVC pipe, and the diameter of the trap should be more than or equals to that of the condensated water pipe.

■ If the unit installed in the ceiling, the condensated water pipe must connected to drainage pipe; and if it installed on the floor, then the condensated water can drain to the drainage pipe directly.

■ The installation of MDB unit, electric heater, hot water heating and ME energy saver are as follows:

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■ Hot water coil installation The hot water coil is secured in the air outlet grid of the master unit with rivets or screws. The connection diagram is as follows:

■ Make sure supports and hangers are provided to the horizontal and vertical air pipes, and stow-

wood is added between the support or hanger of the insulation air pipe and the insulation layer. For the distance between the support and hanger, refer the following table:

Larger side of the rectangle air pipe (mm) ≤500 630-1000 ≥1250 Distance between the support and the hanger (mm) ＜ 3 ＜2.5 2

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4.2 Outdoor unit installation

When the condensing temperature is increasing, the cooling capacity will decrease. In order

to get the maximum capacity, we should take the follows into account.

■ Make sure that the outlet air can not be introduced to the inlet air side directly, and there should be enough space for the maintenance.

■ There should be no obstacle on both the air inlet and air outlet of unit;

■ The unit location must has good ventilation.

■ The base must be strong enough to support the weight of unit and the running vibration;

■ Avoid to install the unit in the environment of machine oil, saline gas and sulphide gas.

4.2.1 Lifting to mount the outdoor unit Please lift to mount the unit as shown below. When moving the outdoor unit, you should support it on four points, instead of 3 support points. If only 3 support points, the unit may be unstable, and even fall off.

Notes: Make sure to move the outdoor unit carefully. If there is package belt with the product, this belt can not be used to lift or move the product. As the belt is easy snapped and bring unexpected matters or danger. Don’t touch the cooling fin of the heat exchanger with your hand, or your hand may be injured. Treat the plastic package bag properly, and please prevent children from playing with it.

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A B C D

Min. distance 500 1500 300 300

■ MDS030～060A/AR Units

■ MDS080～300B/BR

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Design & installation Guide For McQuay MDS Multi System

4.2.2 Parallel Unit Installation (For MDS260/280/300)

The parallel unit means to connect two outdoor units as an integrated unit to connect the indoor unit. The installation of the parallel unit is more complex than that of a single unit. Please read this manual carefully before installation, and install according to the instructions.

■ Outdoor unit installation location

The parallel unit is divided into master unit and slave unit. Place the master unit and slave unit side by side in order.

● The master unit and slave unit must be kept in the same level.

● Leave some gap between the side panels of the master/slave unit. More than 10 mm is

recommended.

■ Connection of Pipelines for the Outdoor Unit

A package of copper fittings for pipeline installation is delivered with the master unit. Please check it for future use. The connection of parallel unit pipelines includes parallel connection of the gas pipe and liquid pipe and the connection of the system balance pipe between the master unit and the slave unit. The system balance pipe must be connected. Take good protection and insulation measures for the pipelines to avoid pipeline friction and damage.

■ Parallel connection of the gas pipe and liquid pipe

● For the connection between the gas/liquid pipe and the unit, refer to the section “Install Refrigerant Pipe”.

● The parallel connection of the gas pipe and liquid pipe is shown in the figure below. The straight

pipe for tee connection must satisfy the dimension requirements in the figure below.

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Design & installation Guide For McQuay MDS Multi System

■ Insulation and protection of the pipeline

● All pipelines must be insulated.

● Take good protection measures for the pipelines to avoid collision, trample, and scratch and abrasion when the pipeline vibrates. Otherwise, the pipeline may be damaged, affecting the unit performance and security, or even causing other safety problems.

Note: After the pipelines are installed, evacuate and pump vacuum.

■ Connection of the system balance pipe

● Make sure the system balance pipe is connected. The system balance pipe should be

connected to the unit through the continuous side hole in the chassis or that in the side panel or that in the unit piping position.

● The balance pipe must be connected orderly, and the connection higher than the level of the pipe to stop valve of the balance pipe.

● Take good protection measures for the balance pipe (especially the place between the continuous side ports) to avoid scratch and abrasion.

● The connection between the balance pipe and the unit is shown in the figure below.

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Design & installation Guide For McQuay MDS Multi System

4.3 Refrigerant piping design and installation

4.3.1 Refrigerant piping design ( including selection of refnet joint )

■ Capacity combination The indoor units & outdoor units should have a relationship as follows:

■ Refrigerant piping limit

Note: the equivalent length is calculated as follows:

One refnet joint equals to 0.5m, one distributor kit equals to 1.0m. The above table is based on the 8/10HP unit.

50%≤

∑ indoor units' cap ∑ outdoor units' cap

≤130%

Note:We strongly recommend that the capacity modulation equals to 100%.

Allowable value piping section

Actual length

≤250

L1+L2+L3+L4+L5+L6+

a+b+……i

Piping

Max. length(m)

Actual length ≤ 100m

L1+L3+L4+L5+L6+i

Equivalent length ≤ 125m

The length from the first branch to the remotest unit L(m) ≤40m L3+L4+L5+L6+i

Height between indoor

Outdoor unit is above ≤ 50m -

Height

unit and outdoor unit

Indoor unit is above ≤40m -

Height between indoor unit and outdoor unit ≤15m -

Diameter of the piping

Charge:D1=Φ28.6 D3=Φ12.7 Charge:D2=Φ19 D4=Φ9.5

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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 0.55 4.0

● For example: when 10HP outdoor unit's actual length is 80m, the piping diameter is 25. 4mm, ten elbows and three oil traps are used, then the equivalent length is calculated as follows: Equivalent length = 80+0.45x10+3.4x3=94.7(m).

■ Application of equivalent length

● When the equivalent length is more than 90% of the actually allowable maximum piping

length (more than 63m in 6HP, 90m in 8/10HP), the gas pipe diameter of the main piping (piping from the outdoor unit to the first branch) should be expanded to a higher level. For instance, when the equivalent length of 10HP outdoor unit is more than 100m, the gas pipe diameter is changed from 28.6mm to 31.8mm.

● When the diameter of gas pipes is expanded to a higher level, the equivalent length should be recalculated as follows:

Expanded equivalent length = equivalent length of main piping X 0.5 + equivalent length of the branch pipe

■ For example: when the actual length of 10HP outdoor unit is 80m, branch pipe length is 20m, the diameter of the main gas pipe is 25.4mm, ten elbows and three oil traps are used (elbows and traps are used only in main piping).

● Equivalent length = 80+0.45X10+3.4X3=94.7(m)

● As the equivalent length is more than 90m, the diameter of gas pipe in the main piping is

expanded to a higher level.

● Expanded equivalent length =(60+0.45X10+3.4X3) X0.5+20=59.1(m).

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Only connected by the refnet joint

■ Connection of refnet joint and distributor kit

Only connected by the distributor kit

Connected by the refnet joint and the distributor kit

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■ 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.

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4.3.2 Refrigerant piping assembly process

Three principle of the refrigerant piping assembly

Processing method

Dry Piping assembly air blow day

Clean

nitrogen charging

air blow

piping assembly use the right material such as copper and welding rod

No air leakage Abide by the welding process

Abide by the flare fitting process

air leakage test

Dry Clean No air leakage

no moisture no dust No refrigerant leakage

Three principle of the refrigerant pipe

● The Exv must be installed vertically

Sequence

install the indoor unit cut the piping required install the pipe nitrogen charging

welding blow air leakage test dry

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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.

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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 Use pressure air to blow pipe is a kind of way to clean the pipe.

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■ 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 value 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.

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4.3.7 Process sequence of air leakage test

■ Main points of testing

Please test as follows:

● The Pressure charging must be tested both in liquid pipe and gas pipe.

◆ First step, keep 3.0kg/cm2 pressure gas for more than 3 minutes---may be can find big gap;

◆ Second step, keep 15.0kg/cm2 pressure gas for more than 3 minutes---may be can

find big gap;

◆ Third step, keep 28.0kg/cm2 pressure gas for more than 24 hours.

Notes:

Keep the 28.0kg/cm2 pressure gas must more than 24 hours. The pressure can not be more than 28.0kg/cm2!

● Check the pressure decrease or not

◆ If the pressure remain the same, then it is OK;

◆ If the pressure decrease, then we should find out the leak gap.

◆ If the ambient temperature when pressure is charged is different from the temperature when

observing, the pressure need to be modified as follows: Modified value = (temperature when pressure is charged- temperature when observing)x 0.1; e.g.: when pressure is charged to 28.0kg/cm2 and the ambient temperature is 25℃; after 24 hours, the pressure is 27.5kg/cm2 and the temperature is 20℃, then you can have a conclusion that it is OK.

yes

Pressure charging

Pass

check and maintain it

refrigerant piping assembly finished

is the pressure released?

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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

■ Material All the insulation material should be strong enough to insulate the pipe. For example, polyethylene is a good insulation material.

■ key points Some areas such as welding area, enlarged port area and flange area can be insulated only after the air leak test. Pay attention to the unit model and the running condition, for some gas pipe and liquid pipe are all needed to be insulated.

pipe insulation

Refrigerant piping assembly

pipe insulation

air leak test

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Design & installation Guide For McQuay MDS Multi System

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 10℃degrees Celsius, the liquid pipe should also be insulated.

■ Key points The thickness of insulation materials depends on the pipe size.

4.3.10 Globe valve operation

■ Globe valve operation procedures

Make sure the pipes are connected and the valves are operation correctly. Please install and operate the valves as follows:

● Gas side globe valve operation

1) Remove the connection pipe with flange: Remove the connection pipe with flange from the gas side globe 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 globe valve label and stick it on the flange of the globe valve to prevent dusts into the globe 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 globe 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 globe 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.

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（Unit: mm）

Outer diameter

Metric system English system

Ф6.35 1/4＂ 9.0 Ф9.52 3/8＂ 13.0

Ф12.7 1/2＂ 16.2 Ф15.88 5/8＂ 19.4 Ф19.05 3/4＂ 23.3

Outer diameter

Metric system English system

Ф6.35 1/4 ＂ 17.0 Ф9.52 3/8 ＂ 22.0

Ф12.7 1/2 ＂ 24.0 Ф15.88 5/8 ＂ 27.0 Ф19.05 3/4 ＂ 36.0

The following table shows the dimension of the nut of the flare fitting nut. （Unit: mm）

■ When connecting the liquid pipe and liquid stop valve, align the center of the flare fitting of the liquid pipe to

that of the stop valve, and then tighten with a moment wrench. Whether tightened with the wrench depends on the setting of the wrench range and the tightening angle. The following table shows the external pipe diameter, the corresponding tightening moment and the tightening angle.

Outer diameter (mm) Tightening moment (N.m) Tightening angle(o)

Ф6.35 14～18 60～90 Ф9.52 35～42 60～90

Ф12.7 50～57.5 30～60 Ф15.88 75～80 30～60 Ф19.05 100～140 20～35

■ The following table shows the dimension of the copper flare fitting.

Globe valve (liquid side)

Globe valve (gas side)

A Valve handle (Before pipe connection, vacuum pumping and additional refrigerant filling for delivery, make sure this valve is closed completely. After the above operations, please fully open it.) B Stop pin (prevent the valve handle from turning over 90 degrees) C Sealing plate (annex) D Connection pipe (annex) Install the pipe firmly to the valve flange with the sealing plate to avoid gas leakage. E Open (slow operation) F Cap and copper spacer Remove the cap and operate the handle. After the operation, reinstall the cap. The moment to tighten the valve handle cap is 23 Nm to 72 Nm. G Access opening Pump vacuum for the refrigerant pipe through this access opening,

and fill additional refrigerant on the site. Open and close the access opening with a double-end wrench. After the operation, reinstall the cap. The moment to tighten the access opening cap is 12 N·m to 15 N·m. H Flare fitting For the tightening moment, refer to the figure in next page. Loosen and screw up the screw with a double-end wrench. Coat refrigerant oil on the contact surface of the flare fitting (Type R22 mineral oil is applicable). K Field connection pipe Braze to the connection pipe. (Please use non-oxidative brazing materials)

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4.3.11 Refrigerant filling

■ Calculation of the additional amount of the refrigerant Additional amount= (φ 15.88 liquid pipe length x180g/m) + (φ 12.7 liquid length x120g/m) + (φ 9.52 liquid lengthx80g/m) + ( φ 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 vac uum pump and how to maintain.

■ The refrigerant amount of fill of the outdoor unit before delivery (excluding the refrigerant to be filled in the site pipe)

■ The additional amount of the refrigerant depends on the liquid pipe diameter and length (based on the liquid pipe).

Diameter of the liquid pipe (mm) 6.35 9.52 12.7 15.88 19.05

Amount of the additional refrigerant (g/m) 50 80 120 180 290

Calculate the refrigerant amount according to the length of the liquid pipe

Add additional refrigerant

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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

● Selection of vacuum pump When selecting a vacuum pump, please pay attention to the follows:

◆ The range of vacuum pump must be up to -755mmHg

◆ The vacuum pump should have a large air flow (more than 40 litres/min).

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● 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 -755mmHg

● After pumping for 2 hours, if the pressure is higher than -755mmHg, or there is some

moisture, then pump it for 1 more hour.

● After 3 hours pumping, if the pressure is still higher than -755mmHg, 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

Type Max. air flow

Application

vacuum drying air discharge

vacuum pump with lubricant

0.02mmHg Suitable Suitable

100L/min

10mmHg

unsuitable Suitable

40L/min

vacuum pump without lubricant

0.02mmHg

unsuitable Suitable

50L/min

Type of vacuum pump and the vacuity

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■ Special vacuum drying This vacuum drying way is used when there are some moisture in the copper pipe. Operating sequence:

1. Vacuum drying: pumping the system for 2 hours;

2. 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.

3. Vacuum drying one more time: pumping the system for 1 hours;if the pressure is less than 75mmHg, then it is OK; if it can not reach -75mmHg, then it should go back to item 2, then item 3.

4. Stop vacuum pumping and wait for 1 hour

5. Additional refrigerant charging

6. Open the vale to charge.

Please note that the gas must be nitrogen, if oxygen is used by mistake, it can result in explosion

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4.4 Design, processing and installation of condensated drain pipe

4.4.1 Design of condensated piping

■ Size selection of main pipe and vertical pipe of condensated water Choose the pipe size according to the condensated water flow from the main pipe of indoor unit and the following table; Suppose the condensated water flow of 1 HP is 2L/h, then the condensated water flow of 3# 2HP and 2# 3HP is calculated as follows: 2（L/h）x 2(HP) x 3(sets) +2L/h x 3(HP) x 2(sets) = 24L/h.

Note:

Suppose the moisture is 10% in the pipe. After the header pipe, the pipe should be larger or equal to VP30.

Note:

The vertical pipe should be larger than VP30

Vertical pipe Vs condensated water flow rate

JIS Polyethylene pipe diameter（mm） allowable flow rate（L/h） Remark

VP20 20 220

unsuitable for

VP25 25 410

theheader pipe

VP30 31 730 VP40 40 1，440 VP50 51 2，760

Suitable for the header pipe

VP65 67 5，710 VP75 77 8，280

Main horizontal pipe Vs condensated water flow rate

JIS

Polyethylene pipe allowable flow rate（L/h）

Remark

diameter（mm） slope ≥ 1/50 slope ≥ 1/100 VP20 20 39 27 unsuitable for the VP25 25 70 50 header pipe VP32 31 125 88 VP40 40 247 175 Suitable for the header pipe VP50 51 473 334

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 drainage 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 horizontal vertical pipe.

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4.4.2 Making and mounting accessory condensate pipes

4.4.3 Slope and supporter of condensate pipe

■ The slope condensate pipe should be more than 1/100

● The length of condensate pipe should be as short as possible to discharge the condensate

water (no air pocket on the way).

■ For a long condensate pipe, you may use a suspension bolt, to ensure the slope is 1/100 (the PVC pipe cannot be bent)

■ The space of the horizontal pipe support is as follows:

■ The length of horizontal pipe should be as short as possible.

4.4.4 Condensate pipe trap When the unit can generate mins pressure at the condensate water outlet of the unit, the water trap should be installed (to prevent the stench coming into the indoor units)

■ The water trap should be installed as shown in the right diagram.

■ Each unit can have only one water trap.

■ The water trap installed should be easy to maintain.

Grade Nominal diameter Interval

Hard PVC pipe 25~40mm Less than 1.0m

Procedure:

connect the condensate pipe

Install the indoor units

check for

water leakage

insulate the

pipe from heat

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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.

4.4.7 Key points

■ The diameter of the condensate pipe should be more than or equal to that of the drainage pipe.

■ The condensate pipe should be insulated.

■ The lift pipe of the condensate pipe should be installed before the indoor unit. When the unit is

running, if there is water in the condenser collector, please check whether the condensate pump is working properly.

■ All the connecting wiring should be solid (especially the PVC pipe).

4.4.6 Accessory condensate pipe (hose)

If the condensate collector is made of polystyrene, it should use the hose. The condensate pipe box can easily connect with the condensate pipe to prevent the condensate coil distorted

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4.4.8 Installation of the drainage lift pipe

If the water collecting header is installed, please refer to the following:

After connecting, the hose should not be higher than the connecting port. This can prevent the water from flowing backwards.

Do not give external force to one side of the unit, and the drainage pipe should not be loose and it should be fixed.

If the drainage pipe needs to be lifted up, it should be less than 300mm. If it is more than 500mm, maybe it will result in the refrigerant leakage.

Use the gradienter to check if the indoor unit is parallel to the ceiling,

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Testing

C H A P T E R

5.1. MDS hardware diagram and configuration

5.1.1 MDS series indoor units

The indoor unit consists of a three-speed fan and an electronic expansion valve (electric heater and swing function optional). The four temperature sensors respectively serve to measure the temperature of the indoor, inlet coil, midlet coil and outlet coil. The MDS-A system can connect with a remove control or remote receiver and, as a slave unit, communicates with outdoor units via RS485 interface. The DIP switches on the controller determine the electric heater, power, unit model and address number.

MRS485 terminal resistor J2-1: ON/OFF indicate whether resistance is present or not.

Power supply

Temperature measurement

Communication port 1 Communication port 2

Memory 3

Model 2 SW1.1 SW1.2 SW1.3 SW1.4 SW1.5 SW1.6

OFF: No Electric heater 1 Electric heater 2 Pump Reserve Reserve Reserve

ON: Yes

Model 2 setting (SW1.1—— SW1.6)

3-speed fan Electronic expansion valve indicator Electric heater Swing

SW1:DIP switch

for function setting

SW2: DIP switch for

indoor unit address setting

SW3: DIP switch for model setting

McQuay MDS030AR, MDS040AR, MDS050AR, MDS060AR, MDS080R Design & Installation Manual

Specifications and Main Features

Frequently Asked Questions

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