Emerson Liebert ICOM-DO User Manual download pdf (Page 79)

Teamwork

71 Liebert

iCOM

for Liebert DSE

™

4.2.1 Application of Teamwork Modes

All units in a network will run in the same Teamwork Mode.

• No Teamwork: Multiple zones in one room

• Teamwork Mode 2: Unbalanced load (large rooms, not all units will have the same load) (work

well for most applications)

• Teamwork Mode 3: Allows the cooling capacity (Supply Sensor) to operate as a local control by

removing only the amount of load required to maintain the discharge air temperature at each

unit. This allows for an unbalanced room load while maintaining a consistent discharge air

temperature. The fan speed is controlled by the remote rack sensors (return, supply, under floor

static pressure) of all units, providing a controlled delivery method of the air to the cold aisle. In

raised floor applications, Liebert iCOM units will share sensor information to achieve even

under-floor air distribution. This distribution is achieved by operating all fans in parallel, which

will also yield the greatest energy efficiency.

4.2.2 No Teamwork

All cooling units work independently, responding to their own sensors. Standby function and unit

rotation are possible, but cascading is not (see Standby and Cascade on page 82). Autoset will not

adjust the proportional band in this mode.

4.2.3 Teamwork Mode 2

Teamwork Mode 2 is designed to prevent units within a group from working against each other or

“fighting.” It is best applied in large rooms with unbalanced heat loads. In Teamwork Mode 2, all

parameters are shared equal to Mode 1, and Unit #1 averages all of the available unit sensor readings on

the network to define whether there is a cooling, heating, dehumidification or humidification request.

If there is a cooling request, all units are released to start cooling resources according to their own

temperature readings; heating is disabled for all units and vice versa. Same for humidity control.

If the network average would ask for 0% proportional band, the most demanding request (highest or

lowest temperature of all units, highest or lowest humidity of all units) would be used to define the

operation to be performed.

Teamwork Mode 2 does not rotate; unevenly distributed working hours to be expected. Autoset will

not adjust the proportional band in this mode.

NOTE

Teamwork 1 is not available on Liebert DSE units.

NOTE

In Teamwork Mode 2, all units must have the same setpoints. The units’ proportional band,

deadband and related settings may differ.

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Emerson Liebert ICOM-DO User Manual Page 79