McQuay MicroTech III Manual

Installation and Maintenance Manual IM 967-1
Group: Controls
Part Number: IM 967-1
Date: October 2010
Supercedes: IM 967
© 2010 McQuay International
MicroTech®III
McQuay Chiller Unit Controller
BACnet®Communication Module (MS/TP)
Pathfinder™ Chiller, Model AWS
Air-Cooled Scroll Compressor Chiller, Model AGZ-D
NOTICE
Use this manual to physically install the McQuay MicroTech III Communication Module into the Chiller unit
controller and connect the Chiller unit controller to your network. Use the appropriate McQuay Engineering
Data (ED), known as the Protocol Information document, to integrate the unit into your network. The Protocol
Information document contains addressing details, BACnet® protocol information, and a list of the data points
available to the network. See the Reference Documents section of this manual for Protocol Information
document numbers. MicroTech III control integration literature is available from your local McQuay International
sales representative and www.mcquay.com.

2 IM 967-1
Contents
Figures .................................................................................................................................................. 2
Revision History ................................................................................................................................... 3
Reference Documents........................................................................................................................... 3
Limited Warranty.................................................................................................................................. 3
General Information.............................................................................................................. 4
Hazard Identification Messages............................................................................................................ 4
Description............................................................................................................................................ 5
Application............................................................................................................................................ 5
Component Data ................................................................................................................................... 5
Light Emitting Diodes (LEDs).......................................................................................................... 6
BACnet Network Connector............................................................................................................. 7
Board-To-Board Connector.............................................................................................................. 7
Installation............................................................................................................................. 9
Contents of the BACnet Communication Module Kit.......................................................................... 9
Installing a new BACnet Communication Module............................................................................... 9
To install a BACnet Communication Module................................................................................... 9
Replacing an Existing BACnet Communication Module ................................................................... 10
To Replace a BACnet Communication Module ............................................................................. 10
Integration............................................................................................................................ 11
Configuring the BACnet Communication Module............................................................................. 11
BACnet MS/TP Configuration using the Keypad/Display............................................................. 11
Changing the BACnet MS/TP Data Transmission Rate ................................................................. 12
Service Information.............................................................................................................15
Test Procedures................................................................................................................................... 15
Parts List............................................................................................................................................. 15
Installation Kit ................................................................................................................................ 15
Figures
Figure 1. BACnet MS/TP Communication Module Attached to MicroTech III Chiller Unit Controller5
Figure 2. BACnet MS/TP Communication Module Components ........................................................ 6
Figure 3. BACnetMS/TP Communication Module and Knockout...................................................... 7
Figure 4. Diagram of Board-to-Board Connector................................................................................. 8
Figure 5. BACnetMSTP Communication Module with Board-to-Board Connector Inserted............. 8
Figure 6. MicroTech III Chiller Unit Controller Password Menu and Main Features........................ 12
Figure 7. MicroTech III Chiller Unit Controller MSTP Setup Menu – Change Baud Rate ............... 13
Figure 8. MicroTech III Chiller Unit Controller MSTP Setup Menu – Apply Change...................... 13

IM 967-1 3
Revision History
IM 967 October 2009 Initial release
IM 967-1 October 2010 Updated OMM 998 to OM 1051. Added AGD Model.
Reference Documents
Number Company Title Source
ANSI/ASHRAE 135-
2004 American Society of Heating, Refrigerating and
Air-Conditioning Engineers
BACnet®A Data Communication Protocol for Building
Automation and Control Networks www.ashrae.org
IM 1002 (50Hz )
IM 997 (60Hz) McQuay International Pathfinder™Air Cooled Chiller Installation Manual www.mcquay.com
OM 1051 McQuay International Pathfinder Air Cooled Chiller Operation Manual www.mcquay.com
ED 15120 McQuay International MicroTech III Chiller Unit Controller Protocol Information,
BACnet and LONWORKS Networks www.mcquay.com
OMM 1087 McQuay International Air-cooled Scroll Chiller, Model AGZ Operation Manual www.mcquay.com
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 © 2010 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 tradenames or registered trademarks of their respective companies: BACnet
from the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.; Windows
from Microsoft Corporation; D-Net, Pathfinder, McQuay and MicroTech III from McQuay
International.

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General Information
This manual contains the information you need to install the BACnet®Communication Module on a
MicroTech III Chiller Unit Controller, incorporate it into the BACnet network, and maintain it.
Hazard Identification Messages
!DANGER
Dangers indicate a hazardous situation that will result in death or serious injury if not
avoided.
!WARNING
Warnings indicate potentially hazardous situations, which can result in property damage,
severe personal injury, or death if not avoided.
!CAUTION
Cautions indicate potentially hazardous situations, which can result in personal injury or
equipment damage if not avoided.
!WARNING
Electric shock hazard. Can cause personal injury or equipment damage.
This equipment must be properly grounded. Connections and service to the MicroTech III
Chiller Unit Controller must be performed only by personnel knowledgeable in the
operation of the equipment being controlled.
!CAUTION
Static sensitive components. Can cause equipment damage.
Discharge any static electrical charge by touching the bare metal inside the control panel
before performing any service work. Never unplug cables, circuit board terminal blocks,
or power plugs while power is applied to the panel.
NOTICE
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with this instruction manual, may cause interference to
radio communications. It has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. Operation of this equipment in a residential area
is likely to cause harmful interference in which case the user will be required to correct
the interference at his or her own expense. McQuay International disclaims any
liability resulting from any interference or for the correction thereof.

IM 967-1 5
Description
The MicroTech III®BACnet Communication Module incorporates a MicroTech III Chiller Unit
Controller into a BACnet local area network (LAN). It supports the BACnet MS/TP (EIA 485) data
link layer (physical layer.)
The BACnet Communication Module is a printed circuit board with a plastic enclosure that connects
to the left side of the McQuay D-Net™ Module as shown in Figure 1 or directly to the MicroTech III
Chiller Unit Controller. The BACnet Communication Module provides access to the MicroTech III
Chiller Unit Controller variables and parameters via BACnet.
Note: The D-Net module is an optional feature that provides remote monitoring and diagnostic
capability for certain models of McQuay chillers. Please refer to supporting literature,
available on www.mcquay.com, for additional details about D-Net.
Application
The BACnet Communication Module connects the MicroTech III Chiller Unit Controller to a
building automation system (BAS) on a BACnet local area network. It is the interface for the
exchange of BACnet objects between the network and the unit controller. Refer to the McQuay
MicroTech III Chiller Operation Manual for keypad details.
Component Data
Figure 1 shows the BACnet Communication Module, located on the far left-hand side of the image
below. It is connected to the AWM, which is mounted directly to the unit controller. Figure 2 shows
the important features of the BACnet Communication Module.
Figure 1. BACnet MS/TP Communication Module Attached to MicroTech III Chiller Unit
Controller
BACnet MS/TP
Communication
Module
D-Net Module attached to unit
controller

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Figure 2 shows the location of the major components of the BACnet MS/TP Communication
Module.
Figure 2. BACnet MS/TP Communication Module Components
Light Emitting Diodes (LEDs)
The BACnet Communication Module has a BSP LED and a BUS LED to indicate communication
activity and status of the BACnet Communication Module. These indicators are visible when the
communication module is connected to the MicroTech III Chiller Unit Controller and the unit is
powered on (see Figure 2).
BSP LED
The BSP LED indicates the communication state between the BACnet Communication Module and
the MicroTech III Chiller Unit Controller. The table below describes the status of the BSP LED.
BSP LED Color Meaning
Flashing between Red & Green Board Support Package (BSP) upgrade in progress
Green Communication is established with the unit controller
Communication is established between the communication
module and the unit controller.
Yellow The communication module is capable of communicating to
the unit controller. However, communication is not
established.
Red flashing with 2Hz Red flashing with 2Hz = Software error.1
Red Hardware error.1
1In the event that this should occur, cycle power to the unit controller to attempt to clear the problem. Contact
the McQuay Controls Customer Support Group at 866-4MCQUAY (866-462-7829) for additional assistance if
necessary.
Network Connector
BSP
BUS LED
+ - Ref

IM 967-1 7
BUS LEDs
The BUS LED indicates the communication status between the BACnet Communication Module and
the BACnet MS/TP network. The table below describes the status of the BUS LED.
BUS LED Color Meaning
Green The unit controller is capable of communicating to the network.
Red The unit controller is not capable of communicating to the network.
Orange / Yellow Communication module is initializing.
BACnet Network Connector
An RS485 connector connects the BACnet Communication Module to the MS/TP Network and has
three pins: + , -, and ref (see Figure 2).
Board-To-Board Connector
The board-to-board connector connects the MicroTech III Chiller Unit Controller to the BACnet
Communication Module (see Figures 3, 4 and 5).
Figure 3. BACnet MS/TP Communication Module and Knockout
Knockout
permanently
removed
Board-to-board
connecto
r
Slot in module must line
up with baffle in board-
to-board connector

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Figure 4. Diagram of Board-to-Board Connector
Figure 5. BACnet MSTP Communication Module with Board-to-Board Connector Inserted

IM 967-1 9
Installation
The following section describes how to field install a new BACnet Communication Module or
replace an existing BACnet Communication Module on the MicroTech III Chiller Unit Controller so
that it can be incorporated into the BACnet network.
!CAUTION
Electrostatic discharge hazard. Can cause equipment damage.
This equipment contains sensitive electronic components that may be damaged by
electrostatic discharge from your hands. Before you handle a communications module, you
need to touch a grounded object, such as the metal enclosure, in order to discharge the
electrostatic potential in your body.
Contents of the BACnet Communication Module Kit
The following is the list of items included in the field-installed kit:
The BACnet Communication Module
Board-to-board connector
Network connector (attached to module)
Installation Manual (IM 967)
Installing a new BACnet Communication Module
Follow these steps to install a BACnet Communication Module on the unit controller. The BACnet
Communication Module can be connected directly to the unit controller itself or to an existing
module, if one is attached.
To install a BACnet Communication Module
!WARNING
Electric shock hazard. Can cause personal injury or equipment damage.
This equipment must be properly grounded. Only personnel knowledgeable in the operation of the
equipment being controlled must perform connections and service to the MicroTech III Chiller Unit
Controller.
1. Remove power from the unit controller.
2. Remove the knockout on the far left end of the unit controller itself (or additional module, if
present). See Figure 3.
Note: To prevent damage to the unit controller, insert a small screwdriver or other tool to the tab on
the bottom of the unit controller and pull the screwdriver away from the controller.
3. Remove the knockout on the right side of the BACnet Communication Module.
4. Insert the board-to-board connector into the BACnet Communication Module (see Figures 3 and
4). Note that it only fits one way and that the baffles must line up with corresponding slots in
BACnet Communication Module and the unit controller (see Figures 4 and 5).

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5. Insert the other end of the board-to-board connector to the far-left side of the unit controller or
other device (i.e. module), if attached (see Figure 1).
6. Connect the BACnet Communication Module to the network by inserting a network cable into
the communication module’s network connector (see Figure 2).
7. Power up the unit controller.
8. The unit controller automatically resets itself approximately 30 seconds after it is powered up.
This reset is necessary so that the BACnet Communication Module is synchronized with the unit
controller.
Note: There is a limit of three devices that can be attached to the left side of the unit controller.
Replacing an Existing BACnet Communication Module
Follow these steps to remove an existing BACnet Communication Module from unit controller and
replace it with a new BACnet Communication Module.
To Replace a BACnet Communication Module
!WARNING
Electric shock hazard. Can cause personal injury or equipment damage.
This equipment must be properly grounded. Only personnel knowledgeable in the operation of the
equipment being controlled must perform connections and service to the MicroTech III Chiller Unit
Controller.
1. Remove power from the unit controller.
2. Locate the BACnet Communication Module to the left of the unit controller (see Figure 1).
3. Pull the network cable connector from the BACnet Communication Module.
4. Grasp the BACnet Communication Module and carefully pull it from the unit controller (or from
an adjacent module, if it is attached to one.)
5. Install the new BACnet Communication Module (see steps 2-5 from previous section).
6. Insert the network cable connector into the BACnet Communication Module (see Figure 2 for
location of network connector).
7. Power up the unit controller.
9. The unit controller automatically resets itself approximately 30 seconds after it is powered up.
This reset is necessary so that the BACnet Communication Module is synchronized with the unit
controller.