Figure 3.18 Freecooling and Compressorized Operation
3.4.2 Vertiv™ Liebert® Air Economizer
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 3.17 on the next page. Connect the supply air thermistor as shown in
Figure 3.19 on the next page (it must be routed from the cooling unit and secured). The illustration shows connections for
the Liebert® DS and Liebert® CW.
3 Service Operation
73
Vertiv™ Liebert® iCOM™Installer/User Guide
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