User manual

Troubleshooting
27
6.0 TROUBLESHOOTING
Table 3 Liebert Air Economizer troubleshooting
Problem Possible Cause Remedy
Reduced Airflow
Blocked filter Replace or clean filter.
Improper duct size Enlarge duct.
Improper relief air/exhaust fan Install properly sized, operating fan.
Debris on screens Clean debris off screen.
Air intake location Move air intake.
High/Low Temp
Sensors not plugged in Connect sensors.
Control not set properly Adjust control/alarm setpoints.
Plenum installed backwards Remove plenum and reinstall correctly.
High/Low Humidity
Humidity is not controlled by
Liebert Air Economizer, no
alarm
Turn off Liebert Air Economizer; use primary cooling
unit only.
Lack of vapor barrier Widen humidity alarm range.
Moisture enters unit
Improper rain shielding Install overhang to keep rain out of intake.
Improper duct design Redesign duct with proper slope.
Contaminants or
particulates enter
conditioned space
Improper location of inlet air Move inlet air duct
Improper air filtration
Install higher-efficiency filters or. correct installation of
current filters.
Corrosive Environment Contact Liebert Corporation at 1-800-LIEBERT.
Pollen, objectionable or
noxious odors or gases
enter conditioned space
Filters will not remove pollen
or odors
Deactivate the Liebert Air Economizer.
Air damper—outside or
room return—does not
open or does not close
Motor not oriented properly Adjust motor position.
Linkage not adjusted Adjust linkage.
Corrosion Clean corrosion and lubricate properly.
Improper wiring Check and correct wiring connections.
No damper function or
signals to damper
Liebert Air Economizer
software is not present, in
control, or was overwritten
during software upgrade
Verify Liebert Air Economizer screens are missing and
install Liebert Air Economizer software to Liebert
iCOM control.