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Installing a Liebert iCOM Unit-to-Unit Network
43
5.3 Wiring for Unit-to-Unit Communications—U2U
Cooling units come from the factory-wired 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). A small display is not consid-
ered a node. Small displays connect directly to input/output boards that do not have large displays
attached to them. The following table illustrates how a network can be configured.
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: technicalservice@emersonnetworkpower.com
Table 10 Sample Liebert iCOM network configurations
Sample
Configuration
Input/Output
Boards
Large
Displays
Small
Displays
Wall Mount
Large
Displays
Private
Switch
Required
12020No
22021Yes
33030Yes
42110Yes
58441Yes
6323200Yes
7322755Yes
8 32 0 32 32 Yes