User manual

Installing a Liebert iCOM Unit-to-Unit Network

83 Liebert

iCOM

for Liebert DSE

™

5.0 INSTALLING A LIEBERT ICOM UNIT-TO-UNIT NETWORK

Connecting multiple Liebert iCOM-controlled cooling units in an Ethernet Unit-to-Unit (U2U)

network enables the units to work together to achieve efficient cooling and humidity control of the

conditioned 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 59.

Figure 59 Standby unit layout example—10 cooling units in room

NOTE

The maximum number of cooling units that may be interconnected is 32.

Cooling units 1 through 5 are on Teamwork Rotation #1

Cooling units 6 through 10 are on Teamwork Rotation #2

Communication Cables , Teamwork Rotation #1

Communication Cables , Teamwork Rotation #2

2 7 36

5 9 410