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ii Service Manual SM-MDS_(ii)

Preface…………………………………………………………………………..…………………….iv

1.0 Introduction………………………………………………………………………………………....1

1.1 Digital Scroll Compressor………………………………………………………..………..1

1.2 Operating Range…………………………………………………………………………..2

1.3 Basic Layout of MDS System…………………………………………………………….3

1.4 Maximum Connectible Indoor………………………………………………………….....3

1.5 Maximum Piping Length…………………………………………………………………..4

1.6 Refnet and Distributor……………………………………………………………………..4

1.7 EXV Box………………………………………………………………………………….…6

2.0 System and Control………………………………………………………………………………..7

2.1 MDS Outdoor System and Control………………………………………………………7

2.2 MDS Indoor System and Control……………………………………………………….10

2.3 MDS System Piping Connection………………………………………………………..11

2.4 Heater Control…………………………………………………………………………….12

2.5 Outdoor Ball Valve Operation…………………………………………………………...13

3.0 PCB, Handset and Wiring……………………………………………………………………..14

3.1 MDS Outdoor Unit PCB………………………………………………………………….14

3.2 MDS Indoor Unit PCB……………………………………………………………………16

3.3 MDS System Wiring……………………………………………………………………...18

3.3.1 Wiring connection between MDS outdoor to indoor units………………….18

3.3.2 Wiring connection between MDS outdoor units…………………………….20

3.3.3 Wiring connection between MDS master and slave unit…………………..21

3.4 Handsets for MDS System………………………………………………………………21

3.4.1 Wireless Handset………………………………………………………………22

3.4.2 Wired Controller MC301……………………………………………………….24

3.4.3 Central Controller MC303………………………………………………….….26

3.4.4 Handsets Wiring………………………………………………………………28

4.0 Smart Commander……………………………………………………………………………….29

4.1 Introduction………………………………………………………………………………..29

4.2 Hardware Requirement………………………………………………………………….29

4.3 Installation of Smart Commander………………………………………………………29

4.4 Wiring Connection………………………………………………………………………..31

4.5 Setup of Smart Commander…………………………………………………………….33

4.6 Smart Commander Software Interface…………………………………………………37

4.6.1 Circuit Monitor…………………………………………………………………..37

4.6.2 Service Monitor…………………………………………………………………41

4.6.3 Additional Function…………………………………………………………….42

Table of Content

McQuay MDS 240B User Manual

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