Emerson Liebert iCOM Manual De Usuario

Dual-cooling systems operate in the same manner as a GLYCOOL system, except they are 

factory-configured to operate free-cooling and compressor simultaneously. If simultaneous operation 

is not desired, contact technical support at 800-543-2778 for assistance.

The Liebert Air Economizer is an option for Liebert downflow units. The Liebert Air Economizer uses 

cool outdoor air in mild climates to condition indoor spaces. It is functional only on cooling units with 

a Liebert iCOM that has been wired and configured to accommodate the Liebert Air Economizer.
The Liebert Air Economizer ships with sensors to determine the temperature and humidity of return 

air and outdoor air. The sensors and wiring to connect them are shipped inside the Liebert Air 

Economizer:

• Outdoor air sensor
• Return air sensor
• Supply air thermistor

These must be installed and connected to the primary cooling unit. The outdoor air sensor and return 

air sensor connections for the Liebert DS

™

 and Liebert CW

™

 are shown in Figure 34. Connect the 

supply air thermistor as shown in Figure 35 (it must be routed from the cooling unit and secured). 

The illustration shows connections for the Liebert DS and Liebert CW.

Risk of improper wiring procedure. Can cause unit damage.
Turn Off all power to the indoor cooling unit before connecting cables or wires. Failure to do so 

may damage the equipment.