IM 743-1 13
Service Information
Test Procedures
If you can control the unit from its keypad, but you are unable to communicate with it via the
network:
• Check the network wiring
• Check that the Control Source setpoint is set to Local (see Unit Setup for Network Control
section.)
• Check that the Protocol Unit Setpoint is set to Modbus (see Addressing and Establishing
Communications section.)
• Check that the ID number Unit Setpoint is set to communications module network address (see
Addressing and Establishing Communications section.)
• If the Modbus Communication Module still does not respond, contact the McQuay Controls
Customer Support group at 866-4MCQUAY (866-462-7829).
Replaceable Parts List
Network Connection Plug
Generic Replacement Parts
If you lose this terminal block, you can replace it with a standard block from a manufacturer. The list
below contains manufacturers’ part numbers for equivalent parts.
Manufacturer Telephone Order Number
Phoenix Contact (800) 888-7388 17 57 02 2
Altech Corp (908) 806-9400 37.003
Replacement Kits and Parts
Description Part No.
MicroTech II Modbus Communication Module kit 350147402
MicroTech II Modbus Communication Module (RS-485
networks)
330343101
This document contains the most current product information as of this printing. For the most current product
information, please go to www.mcquay.com.
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