Figure 3.22 Air Flow Pattern of a Liebert® Air Economizer System-Dropped Ceiling
Not in Operation
When the Liebert® Air Economizer is not operating, the outside air damper is closed, the return air damper is open and the
relief air vent fan is shut down. This permits air from the conditioned space to be drawn into the primary cooling unit, cooled
and expelled into the conditioned space. The relief air vent is not required while the Liebert® Air Economizer is not in service
because no air volume is being brought into the conditioned space.
Startup Configurations
When a non-Liebert mixing box and damper motors are used, make sure that the following configurations are verified before a
unit is placed into service.
• Verify that spring closed return dampers are installed and operating properly. Without a spring return motor, the
dampers will remain in the position they were in when power was present.
3 Service Operation
78
Vertiv™ Liebert® iCOM™Installer/User Guide
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