Emerson Liebert DS Precision Cooling System 28-105kW Manuel D’Utilisation
Troubleshooting
27
6.0
T
ROUBLESHOOTING
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.