Hitachi RCI Service Manual page 402

12 Maintenance notes
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
fins.
After cleaning, fit the drain pan by lowering the rope.
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.
¿ Cleaning of the wall-type indoor unit (RPK)
Preliminary procedure.
Place a vinyl sheet on the floor to protect the furniture and other items from the cleaning water before starting this job.
Remove each part as indicated in the "Wall type" section.
Remove the front panel as indicated in section
Remove the electrical box after opening the corresponding panel and then disconnect the connectors located between the
indoor and outdoor units and other connectors, as indicated in section
Remove the drain pan. Also carry out the following tasks:
1 Remove the drain pan after emptying it of water.
2 Empty the drain pan of water by removing the rubber plug. Make sure the water flows easily through the hole by inserting
a pencil into it.
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
fan motor, see on page 341.
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.
390
SMGB0063 rev. 1 - 10/2010
3
to protect the
Removal of the front panel, see on page 323.
Remove the electrical box
Removal of the heat exchanger, see on page 337 and
panel, see on page 329.
Removal of the