McQuay MDS030A User manual

Design & Installation Guide For McQuay MDS Multi System

Engineered for flexibility and performance.TM

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 ’sShenzhen-based factory. Pursuant to the

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

-8-

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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