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IM 820
Service and Maintenance
Electrostatic Filters
Pre-charged electrostatic polypropylene filter removes
microscopic dust, smoke and small invisible particles to keep
the room air clean.
Filter Replacement
See Figure 14.
Replace the electrostatic air purifying filters every 6 months
or sooner if they turn brown.
Replacement filters can be purchased from your sales repre-
sentative or distributor.
Use the new filter immediately once it has been removed
from the package.
1.
Open the return air grilles and remove the filters.
2. Use a vacuum cleaner or wash with water with a neutral
cleaning agent.
3. Rise and dry before installing the filter.
Note:
Never use chemicals such as gasoline or paint thin-
ner to clean the filters. Filters will be damaged.
Figure 14. Changing the Filters
Startup After Extended Shutdown
•
Inspect thoroughly and clean indoor and outdoor units.
•
Clean or replace air filter.
•
Clean condensate drain line.
•
Clean clogged indoor and outdoor coils.
•
Check fan imbalanced before operation.
•
Tighten all wire connections.
•
Check for refrigerant leakage.
Note:
The crankcase heater should be energized for at least
6 hours before starting the unit.
Troubleshooting
If any malfunction of the unit is noted, immediately switch
off the power supply.
Check the following chart for possible causes/treatments.
If the trouble persists, please call your local dealer/service-
man.
WARNING
Disconnect the electrical power supply before performing
any service, maintenance or troubleshooting.
WARNING
Disconnect the main power supply before opening the
return air grille.
DO NOT restore power until the grille is closed.
Trouble
Possible cause/treatment
The compressor does not
operate.
Protection against frequent
starting. Wait for 3 to 4 minutes
for the compressor to start
operating.
Fans and compressor do not
operate.
Power failure.
Check fuse or circuit breaker.
Power supply disconnect off.
Delay timer may be set
incorrectly.
Air flow too low or insufficient
cooling/heating capacity.
Dirty air filters.
Doors or windows open.
Adjust thermostat setting.
Discharge air flow has
bad odor.
Smoke, perfume, etc. may
have collected on the indoor
coil.
Clean coil.
Condensation on the return air
grille of the indoor unit.
Use dry mode. High humidity
in conditioned space.
Set temperature too low.
Increase temperature setting
and operate unit at high fan
speed.
Condensate leaking into room.
Condensate drain plugged.
Hissing sound from the unit
during operation.
Refrigerant fluid flowing into
the evaporator coil. Operate
for a while to see if sound goes
away.
