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Retrofit Installation
39
9.4.1 System Wiring (Himod)
Two wiring harnesses are included with the retrofit kit, one for the
power connection and the second for communications. They are of suf-
ficient length for use with the Himod unit.
9.4.2 Power Connection (Himod)
The harness supplied with the OpenComms Network Interface Card
(p/n 159084G1) is equipped with three connectors, one at either end of
the harness and one in the middle. The harness taps power from the
24 VAC input to the control board of the environmental unit. To con-
nect this power to the NIC:
1. Locate the connector containing the two red wires plugged into
P43 on the control board and unplug it. Reconnect it to the
connector in the middle of the supplied harness.
2. Plug one end of this harness into P43 on the control board and the
other end into TB3 of the OpenComms card.
9.4.3 Communication Connection (HiMod)
The second wiring harness provided (p/n 159083G1) has a connector
fitted at either end and is the communications connection between the
unit microprocessor and the NIC.
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.
9.5 Mini-Mate2
An enclosure is recommended for use with ceiling-mounted environ-
mental units or where internal mounting of the Network Interface
Card is not feasible. Older-generation Deluxe and Challenger units
may also require external mounting.
NOTE
Board illustrations are shown only for location of connections.
Board location and wire length may change depending upon
the specific installation.