Troubleshooting - Liebert Integrated Secured Protection User Manual

PROBLEM
ECM Not Cooling
Fans blowing warm air
Condensate draining
continuously
Excessive vibration or
noise
Cabinet is excessively
hot

TROUBLESHOOTING

CAUSE
No Power
Filter Clogged
Refrigerant loss
Hot Gas Bypass Valve set
incorrectly
Squirrel cage free spinning on
evaporator or condenser blowers
Clogged Condenser coil
Compressor trips on thermal
overload.
Faulty Compressor
Excessive opening of doors
Enclosure not properly sealed
Evaporator drain kinked or
clogged
Defective motor in blower
Defective squirrel cage in blower
ECM is overloaded
Heat not rejected from room
ECM not cooling
UAS operation
60 HZ: Verify F2 fuse not blown by
checking on/off switch. If not lit, fuse is
50Hz: Verify breaker has not tripped.
Clean, or replace filter
Verify leak. If refrigerant system needs
repaired, replace ECM.
Set valve correctly per LGH handbook
Reattach and tighten squirrel cage to
Clean coil
Open LGH doors and let compressor cool.
Turn ECM on and verify compressor is
energized (humming). Verify cold air is
being discharged from evaporator
discharge (right side of ECM).
Verify Compressor has failed. Replace
ECM. If electrical component has failed
causing compressor not to run, replace
component.
Reduce the amount of opening. Suggest
external keyboard tray. Turn ECM off
when opening door.
Verify leak and fix or replace gasket
Remove ECM and verify plastic tubing is
attached to drain and not kinked or
clogged.
Replace motor
Replace squirrel cage, or reattach and
tighten to blower shaft.
Verify the correct UPS and load on UPS. If
no UPS; verify watt load of equipment
does not exceed ECM rating.
Verify LGH is located in room with air
circulation and heat rejected from ECM is
sufficiently removed from room.
See above
Verify UAS operation by jumpering
terminals on high temperature stat
23
SOLUTION
blown
blower shaft