Hitachi RCI Service Manual page 387

12 Maintenance notes
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 front panel.
Disconnect the drain piping.
Remove the front partition and the drain pan.
Cover the rear of the heat exchanger with a vinyl sheet
Fit the front partition and the drain pan.
Cleaning the indoor unit
Lift the drain pipe and place the end in a bucket.
Use a brush to clean any dust from the interior surface of the heat
exchanger. To do so, brush downwards and collect all of the dust
in a bucket or cardboard box.
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SMGB0063 rev. 1 - 10/2010