Liebert iCOM
®
Control
93 Liebert
®
CRV
™
11.3 Liebert CRV Operation—Liebert iCOM Control
The Liebert iCOM on the Liebert CRV leaves the factory with the fan speed and cooling capacity
controlled by the supply air sensor. This control mode ensures that that the Liebert CRV is delivering
precise cooling to the cold aisle.
Installing the remote rack sensors allows the fan speed and the cooling capacity to be decoupled. This
means that the fan speed can be controlled independently of the cooling capacity. In this
configuration, the Liebert CRV can control the discharge temperature of the unit by modulating
cooling capacity based on the supply sensor and use the remote rack sensors to ensure that cool air is
being delivered to the racks’ inlet. Using the supply and remote rack sensors in this decoupled mode
is the preferred method for controlling the Liebert CRV in a hot / cold aisle configuration. In addition
to this configuration, Emerson has provided additional flexibility for other applications shown in
Table 33.
In the Setpoint screen, the controlling temperature sensor (S102) can be set to either Supply, Return
or Remote. As the selection is changed from one sensor to another, the setpoint is displayed next to
the corresponding sensor on the illustration, showing the sensors placement in relation to the
Liebert CRV.
Figure 66 Service Menu - Setpoint screen
A password must be entered to change the setting.
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