Liebert OpenComms Installation & User Manual page 13

System Wiring (SM, AM, AG Microprocessors)
Two wiring harnesses are included with the retrofit kit, one for
the power connection and the second for communications. They
are of sufficient length for use with the Deluxe System/3 and
ICS units and the microprocessors listed above. For the
Challenger product series, use the longer wiring harnesses
included with the NIC-K-Chall kit.
NOTE: Board illustrations are shown only for
location of connections. Board location and
wire length will change depending upon the
specific installation.
Power Connection (SM, AM, AG Microprocessors)
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 connect 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.
Power Connection (Level 0 and Level 10 Microprocessors)
To connect power to the NIC, wire as described above.
However, some field modification of the wiring harnesses is
necessary for connection to legacy systems.
Level 0: Remove the power connector normally plugged into
P43 and wire to terminal connections 1-5 (24V)/1-10 (ground).
12 Installation