Hitachi RCI-1.0FSN3 Service Manual page 421

12 Maintenance notes
3 Once the drain pan has been removed, check that there is no water in the drainage at the bottom of the pan.
4 Clean and dry the pan before removing it. Handle the pan carefully.
Remove the heat exchanger as indicated in sections Removal of the heat exchanger and Removal of the fan motor.
Cleaning the indoor unit
N O T E
Wear gloves to avoid injuries caused by the heat exchanger fins.
Clean the inner surface of dust. Collect all of the dust in a bucket or a cardboard box.
Place a vinyl sheet around the electrical components to protect
them from splashed cleaning water.
Secure the motor panel using adhesive tape.
Hang the cleaning water manifold from the indoor unit.
1 Tie the rope to the suspension bolts of the indoor unit and drop
downwards.
2 Insert the support bars into the holes in the water manifold.
3 Tie the rope to the support bar of the water manifold and hang
the manifold.
4 Connect a pipe to the boss and place the end inside the pipe.
Pour approximately 15 litres of cleaning product for the aluminium fins into a supply tank.
Insert the nozzle of the pressurised water gun into the hole in the cleaning water manifold. Start the water pump and clean
the heat exchanger of any dust.
After cleaning, spray and remove all remains of water.
N O T E
1 Set the pressure of the water pump so as not to damage the funs.
2 Any cleaning water left behind will rust the fins. Set the pump pressure to between 2.5 and 5 kg/cm
the fins.
Dry the remains of any water on the indoor unit.
Check the insulation of the drain pump using a megohmmeter. Check that the insulation is above 1 MΩ when 500V are
applied.
Connect the wiring.
Perform the neutralisation treatment after cleaning.
After cleaning, fit the drain pan by lowering the rope.
Perform the neutralisation treatment after cleaning.
409
SMGB0077 rev.0 - 01/2013
to protect
3
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