McQuay IM 743, MicroTech II, IM 743-1 Installation Manual

Installation and Maintenance

MicroTech II®
Chiller Unit Controller
Modbus® Communication Module

• WSC Water-Cooled Centrifugal, Single-Compressor

• WDC Water-Cooled Centrifugal, Dual-Compressor

• WPV Water-Cooled Centrifugal, Single-Compressor

IM 743-1

Group: Controls

Part Number: IM 743

Date: May 2005

Supersedes: IM 743-0

• HSC Water-Cooled Single-Compressor Centrifugal, Heat Recovery

• HDC Water-Cooled Dual-Compressor Centrifugal, Heat Recovery

• TSC Water-Cooled Single-Compressor Centrifugal, Templifier

• WMC Water-Cooled Centrifugal, Magnetic Bearing

• AGZ Air-Cooled Global Scroll

• ACZ Air-Cooled Scroll Condensing Unit

• WGZ Water-Cooled Global Scroll

• AGS Air-Cooled Global Screw

• WGS Water-Cooled Global Screw

NOTICE

Use this manual to physically install the communications module into the unit and connect the unit to
your network. You also need the appropriate McQuay Engineering Data Sheet known as Protocol
Information to integrate the unit into your network. Protocol Information contains addressing details,
Modbus® protocol information, and a list of the data points available to the network. See the
Reference Documents section of this document for part numbers of the Protocol Information. These
documents are available from your local McQuay International representative and at the McQuay
International web site: www.mcquay.com.

© 2005 McQuay International

Table of Contents

Figures .................................................................................................................................................. 2

Revision History ................................................................................................................................... 3

Reference Documents ........................................................................................................................... 3

Limited Warranty.................................................................................................................................. 4

General Information.............................................................................................................. 5

Description............................................................................................................................................ 5

Application............................................................................................................................................ 5

Component Data ................................................................................................................................... 6

Modbus Connector............................................................................................................................ 6

8-Pin Header ..................................................................................................................................... 6

Installation ............................................................................................................................. 7

Mounting............................................................................................................................................... 7

Mounting a Modbus Communication Module.................................................................................. 7

Replacing an Existing Modbus Communication Module ............................................................... 10

Unit Setup for Network Control ..................................................................................................... 10

Integration............................................................................................................................ 11

Connecting to the Network ................................................................................................................. 11

Network Topology.......................................................................................................................... 11

Addressing and Establishing Communications................................................................................... 11

Network Address and Baud Rate.................................................................................................... 11

Configuring the Unit Controller.......................................................................................................... 11

Service Information.............................................................................................................13

Test Procedures................................................................................................................................... 13

Replaceable Parts List......................................................................................................................... 13

Network Connection Plug............................................................................................................... 13

Replacement Kits and Parts ............................................................................................................ 13

Figures

Figure 1. Modbus Communication Module – RS-485 (Component Side) ........................................... 5

Figure 2. Modbus Communication Module Major Components.......................................................... 6

Figure 3. Serial Card Slot Location on Unit Controller ........................................................................ 8

Figure 4. Serial Card Slot Detail........................................................................................................... 8

Figure 5. Network Cable Routing and Connections ............................................................................. 9

Figure 6. Network Connection Detail................................................................................................... 9

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Revision History

IM 743-0 April 2003 Initial release.

IM 743-1 May 2005 Removed references to RS 232 serial connection.

Reference Documents

Number Company Title Source

ED15063 McQuay International MicroTech II Protocol Information for McQuay

IMM AGS McQuay International MicroTech II Air-Cooled Screw Chiller

IOMM ACZ/AGZ McQuay International MicroTech II Air-Cooled Condensing Unit

IOMM ACZ1 McQuay International MicroTech II Air-Cooled Condensing Unit

IOMM AGZ McQuay International MicroTech II Air-Cooled Scroll Chiller

IOMM WGZ McQuay International MicroTech II Water-Cooled Scroll Chiller

IOMM WPV McQuay International MicroTech II Centrifugal Chiller Installation,

IOMM WSCWDC McQuay International MicroTech II Chiller Unit Controller Installation,

OM AGS McQuay International MicroTech II Controller for AGS Chillers

OM CentrifMicro II McQuay International MicroTech II Unit Controller for Centrifugal

OM WGS McQuay International MicroTech II Controller for Water–Cooled Screw

OM WMC McQuay International MicroTech II Controller for WMC Magnetic

IOMM TSC McQuay International MicroTech II Templifier Single Compressor

- Modbus Modbus over Serial Line Specification &

Added WGS, WMC, HSC, TSC, and HDC models to Reference
Documents section and cover page.

Corrected pin connections on Figure 6.

Added notes under Unit Setup for Network Control and
Network Address and Baud Rate sections.

www.mcquay.com
International Chiller Unit Controllers, Modbus
Networks

www.mcquay.com
Installation and Maintenance Manual

www.mcquay.com
Installation, Operation, and Maintenance Manual

www.mcquay.com
Installation, Operation, and Maintenance Manual

www.mcquay.com
Installation, Operation, and Maintenance Manual

www.mcquay.com
Installation Manual

www.mcquay.com
Operation, and Maintenance Manual

www.mcquay.com
Operation, and Maintenance Manual

www.mcquay.com
Operating Manual

www.mcquay.com
Chillers and Templifiers Operating Manual

www.mcquay.com
Chiller Operating Manual

www.mcquay.com
Bearing Compressor Chiller Operating Manual

www.mcquay.com
Centrifugal Installation, Operation, and
Maintenance Manual

www.Modbus.org
Implementation Guide v1.0

IM 743-1 3

Limited Warranty

Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find
your local McQuay Representative, go to www.mcquay.com.

Notice

Copyright © 2005 McQuay International, Minneapolis MN. All rights reserved throughout the world.
McQuay International reserves the right to change any information contained herein without prior
notice. The user is responsible for determining whether this software is appropriate for his or her
application.

®™ The following are trademarks or registered trademarks of their respective companies. BACnet is a
registered trademark of the American Society of Heating, Refrigerating and Air-Conditioning
Engineers, Inc. Echelon, Windows is a registered trademark of Microsoft Corporation. McQuay is a
trademark and MicroTech II is a registered trademark of McQuay International.

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