Emerson Liebert iCOM User Manual Page 47

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Operation
37 Liebert
®
iCOM
®
NOTICE
Risk of improper operation. Can cause degraded cooling and ventilation operation because of
improper building air pressure.
The incoming air from the outside damper requires expelling an equal volume of air through a
field-provided powered relief air vent. The volume that must be expelled will vary from 0 to
80% of the total airflow for all Liebert Air Economizer
units. The powered relief system
should be sized for 80% of the total airflow for all Liebert Air Economizer units in the
conditioned space and to maintain minimal building air pressure.
Figure 33 Operational ranges for chilled water systems and compressor systems
Operation range is based on ASHRAE 90.1
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