Hitachi RCI Service Manual page 384

12 Maintenance notes
RCD - 2-way cassette type
D A N G E R
Wear gloves to avoid injuries when handling components.
Work prior to cleaning
Turn off the power supply switches before starting maintenance work and fit the appropriate safety locks and warnings.
Wait 5 minutes after turning off the power supply switches.
Place a vinyl sheet on the floor to protect the furniture and other items from the cleaning water.
Remove the following components:
1 Drain pan.
2 Float switch.
3 Drain mechanism.
Cleaning the indoor unit
Clean the drain pan you have just removed.
Use a brush to clean any dust from the interior surface of the heat
exchanger and from the fins on the inlet side. To do so, brush
downwards and collect all of the dust in a bucket or cardboard box.
Place a vinyl sheet around the heat exchanger to prevent the
cleaning water from splashing the insulation surface and drain
pump.
Attach the vinyl sheet to the side plate of the exchanger using
adhesive tape. Seal the gap between the vinyl sheets with adhesive
tape.
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SMGB0063 rev. 1 - 10/2010