Installing a Liebert iCOM Unit-to-Unit Network
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5.0
I
NSTALLING
A
L
IEBERT
I
COM U
NIT
-
TO
-U
NIT
N
ETWORK
Connecting multiple Liebert iCOM-controlled cooling units in an Ethernet Unit-to-Unit (U2U) net-
work enables the units to work together to achieve efficient cooling and humidity control of the condi-
tioned space. Networking enables setting up the cooling units to exchange data for various modes of
operation:
• Teamwork
• Lead/Lag-Standby
• Rotation
• Cascade
However the cooling units are set up, a large display may be used to control and view the operational
status of individual units or of the entire system.
5.1
Placement of Cooling Units
Refer to the cooling unit product manuals for details on installation. Also consider these factors when
planning for installation of cooling units with Liebert iCOM controls:
• heat load in the conditioned space
• cooling air distribution
• number of operating units versus number of standby cooling units
• location of the network switch—An Ethernet cable cannot exceed 328 feet (100m)
5.1.1 Balancing Operating and Standby Units
Assign identification to the units in a manner that balances the operating units and standby units
according to room layout and heat-load requirements. For example, identify the operating units with
numbers 1 through 5 and the standby units 6 through 10. Refer to
Figure 27
.
Figure 27 Standby unit layout example—10 Precision Cooling units in room
NOTE
The maximum number of cooling units that may be interconnected is 32.
Precision Cooling units 1 through 5 are on Teamwork Rotation #1
Precision Cooling units 6 through 10 are on Teamwork Rotation #2
Communication Cables , Teamwork Rotation #1
Communication Cables , Teamwork Rotation #2
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Summary of Contents for Liebert Challenger 3000
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