Hitachi FSG Series Service Manual page 165

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WARNING: TURN OFF all power source switches
5. Insert the spray nozzle through the hole of the cleaning
water collector. Operate the water pump and clean the dust
on the heat exchanger. After cleaning, spray clean water to
remove the cleaning water.
Adjust the pressure of the water pump so as not to damage
the fins.
NOTE:
If the cleaning water remains, fins will be corroded.
Adjust the pressure of the pump at 2.5 to 5.0 kg/cm² so as
not to damage fins.
6. After cleaning, mount the drain pan by extending the rope
downwards.
NOTE:
In the case that the cleaning water collector is removed,
wipe off the drops from the indoor unit.
Bucket
2
SERVICING
51
Cleaning Spray
Drain Pan
Cleaning
Water
collector