Figure 3.20 Supply Limit Thermistor Wiring and Restricted Airflow Switch Location
3.5 Vertiv™ Liebert® Air Economizer Operation
Liebert® cooling units control the Liebert Air Economizer with the analog outputs of the Vertiv™ Liebert® iCOM™ control. The
Liebert® iCOM™ can be used with a Liebert® Air Economizer or with an air economizer supplied by others if equipped with 0-
10VDC or 2-10VDC dampers. The Liebert® iCOM™ is capable of driving two independent damper motors or can be set up
through the software to output a single signal where the dampers are inversely driven.
The primary cooling unit responds to sensors that monitor the temperature and humidity of the outdoor air, return air and
supply air. If outdoor conditions are within the tolerances set, the primary cooling unit opens the Liebert® Air Economizer’s
dampers varying amounts to use outdoor air for cooling. When outdoor conditions are too warm or humid for cooling, the
primary cooling unit closes the Liebert® Air Economizer’s dampers, taking it out of the cooling process. Humidification and
dehumidification are disabled when the Liebert® Air Economizer is operating.
3 Service Operation
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Vertiv™ Liebert® iCOM™Installer/User Guide
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