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
.
