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Retrofit Installation

9.3.2 Communication Connection—SM, AM, AG

Microprocessor

The second wiring harness provided (p/n 159083G1) has a connector

fitted at either end and is the communication connection between the

unit microprocessor and the NIC-485.

To put it in the system:

1. Remove the existing wire located on P25 of the environmental

controller, cut off the red connector and reconnect the wires to TB2

of the interface card. Ensure correct polarity.

2. Connect one end of the wire harness to TB1 of the interface card;

the other end connects to P25 of the environmental controller.

9.3.3 Communication Connection—Level 0 and Level 10

Microprocessors

To connect communication wire to the NIC-485, wire as described

above. However, some field modifications of the wiring harnesses are

necessary for connection to legacy systems. Level 0 and Level 10:

Remove the red connector normally plugged into P25. Wire to termi-

nal connection P25.

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