Emerson MONITORING OpenComms Manuel D’Utilisation

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.

To connect communications wire to the NIC, wire as described above. 

Some field modifications of the wiring harnesses are necessary for con-

nection to legacy systems. Level 0 and Level 10: Remove the red con-

nector normally plugged into P25. Wire to terminal connection P25.

Position the OpenComms card in the low voltage/control cavity of the 

Liebert Himod unit. Refer to the drawing below for typical positioning. 

Use three #8 x ½” sheet metal screws to affix mounting plate to the 

Environmental unit.
Figure 14 Himod NIC installation location