13600 Industrial Park Boulevard, Minneapolis, MN 55440 USA (763) 553-5330 (www.mcquay.com)
Service Information
Test Procedures
If you can control the unit from the keypad but are unable to communicate with it via the network,
try the following:
• Verify the network (bus) wiring
• Check the integrity of the cable harness to the network terminals
• Verify that the N2 address (SW1) is set to a unique binary number between 1 and 253.
If the MicroTech II N2 Open communication module still doesn’t respond, replace the
communication module.
List of Replaceable Parts
Network Connection Plug
Generic Replacement Parts
The three-contact network connector plug has custom markings, but if you lose this terminal block
you can replace it with a standard block without the markings from a manufacturer. The list below
contains manufacturers part numbers for equivalent parts without the custom markings.
Manufacturer Telephone Order Number
Phoenix Contact (800) 888-7388 17 57 02 2
Altech Corp (908) 806-9400 37.003
Direct Replacement Parts
You can order direct replacement parts for these connector plugs from McQuay International
(1-800-37-PARTS).
Part Number Description
AS-TBKIT-0 5 terminal blocks marked REF, N2- and N2+
Kit
Component Description Part No.
Kit N2 communication module for unit ventilators with standoffs 107293125
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