Liebert Icom ® Control - Emerson Liebert CRV User Manual

11.0 L COM
IEBERT I
The Liebert CRV is equipped with the most-advanced Liebert iCOM control system. The large Liebert
iCOM display is standard on the Liebert CRV.
Each Liebert CRV contains a return air temperature and humidity sensor, supply air temperature
sensor and three remote rack sensors. Up to an additional seven remote rack sensors can be added to
the sensor network. Each rack sensor takes two temperature readings and reports either the average
or the maximum temperature of the two sensors.
The 2T rack temperature sensors provide feedback to the cooling unit about the condition of the air
entering the server racks. This information allows the Liebert CRV to ensure it is providing just
enough cold air to each rack, virtually eliminating hot spots. Overcooling and excessive airflow are
avoided, greatly reducing unnecessary energy consumption.
Each Liebert CRV includes three 2T rack temperature sensors to monitor three racks. A total of ten
2T temperature sensors can be connected to each cooling unit to monitor every rack a Liebert CRV is
protecting. When multiple cooling units are connected in a Unit-to-Unit Liebert iCOM control
network, all sensor data is shared to optimize their performance as a system.
2T rack sensors can also be initially installed on empty racks reserved for future growth with the
control set to ignore these sensor readings. The extra 2T temperature sensor readings can also be
displayed on the local display and reported remotely for monitoring purposes only without the
readings affecting unit operation. This function provides users with a built-in mini-monitoring
system.
NOTE
Not all the commands and functions referred to in the Liebert iCOM sections of this document
will be available on all types of Liebert CRV units.
For instance, commands and functions relating to chilled water will not have a corresponding
feature in DX units.
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Liebert CRV
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ONTROL
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Liebert iCOM Control