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
