Hitachi RCI Service Manual page 399

12 Maintenance notes
Secure the vinyl sheet to the side plate of the exchanger using
adhesive tape and seal the gap between the vinyl sheets in the
same manner.
Secure the motor panel using adhesive tape.
Clean the dust from the inner surface of the heat exchanger by
brushing it downwards. Collect all of the dust in a bucket or a
cardboard box.
Hang the cleaning water manifold from the indoor unit.
Tie the rope to the suspension bolts of the indoor unit and drop
downwards.
Insert the support bars into the holes in the water manifold.
Tie the rope to the support bar of the water manifold and hang the
manifold.
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.
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SMGB0063 rev. 1 - 10/2010