Unit installation

Liebert iCOM Control
18
5.3 Wiring for Unit-to-Unit Communications—U2U
Cooling units come from the factory-wired and configured for stand-alone operation.
Liebert iCOM U2U Ethernet Network
The Liebert iCOM U2U network must be isolated from other network traffic. The network switch(es)
that connect Liebert iCOM controls need to be dedicated to supporting only Liebert iCOM communi-
cation. The U2U network cannot be connected to the building or IT network. If network communica-
tion is ever lost (failed network switch, etc.), all Liebert iCOM-controlled cooling units will continue to
operate as independent units.
The Liebert iCOM control can support up to 64 nodes on one network. An input/output board, large
display, and large wall-mount display are each considered one node. Of the 64 nodes that may be con-
nected, no more than 32 may be input/output boards (32 cooling units).
Network communication can be configured during system startup by a Liebert-trained technician. For
technical issues contact:
Liebert Technical Service
1050 Dearborn Drive
Columbus, Ohio 43235
Telephone: 1-800-LIEBSRV (1-800-543-2778)
E-Mail: [e-mail]
5.3.1 Wiring a Liebert iCOM U2U Network
A network switch is required to enable Ethernet unit-to-unit communication on one or more cooling
units with large displays. Each cooling unit with a large display requires two straight-through Ether-
net cables from a network switch. One cable connects to port P64 on the Liebert iCOM input/output
board and the other straight-through cable connects to the P64 port on the back of the large display
(see Figure 18).