Service And Maintenance; Electrostatic Filters; Filter Replacement; Startup After Extended Shutdown - Daikin IM-820 Installation And Maintenance Manual

Service and Maintenance

Disconnect the electrical power supply before performing
any service, maintenance or troubleshooting.

Electrostatic Filters

Pre-charged electrostatic polypropylene filter removes
microscopic dust, smoke and small invisible particles to keep
the room air clean.

Filter Replacement

Disconnect the main power supply before opening the
return air grille.
DO NOT restore power until the grille is closed.
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
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WARNING
WARNING

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.
Trouble
The compressor does not
operate.
Fans and compressor do not
operate.
Air flow too low or insufficient
cooling/heating capacity.
Discharge air flow has
bad odor.
Condensation on the return air
grille of the indoor unit.
Condensate leaking into room.
Hissing sound from the unit
during operation.
Possible cause/treatment
Protection against frequent
starting. Wait for 3 to 4 minutes
for the compressor to start
operating.
Power failure.
Check fuse or circuit breaker.
Power supply disconnect off.
Delay timer may be set
incorrectly.
Dirty air filters.
Doors or windows open.
Adjust thermostat setting.
Smoke, perfume, etc. may
have collected on the indoor
coil.
Clean coil.
Use dry mode. High humidity
in conditioned space.
Set temperature too low.
Increase temperature setting
and operate unit at high fan
speed.
Condensate drain plugged.
Refrigerant fluid flowing into
the evaporator coil. Operate
for a while to see if sound goes
away.
IM 820