Hitachi RCI-1.0FSN3 Service Manual page 424

12 Maintenance notes
Place a vinyl sheet around the electrical components except the
drain pan to protect them from splashed cleaning water.
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 car-
dboard box.
Hang the cleaning water manifold from the indoor unit.
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.
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.
Perform the neutralisation treatment after cleaning.
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RPI(M) - Ducted indoor unit 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 Side panel.
2 Discharge air grille.
3 Air filter.
4 Liquid and gas piping thermistors.
5 Fan motor.
Remove the set screws from the partition plate 2 and remove the plate.
Remove the set screws from the fan cover, located on the left and right of the partition. Then remove the fan cover.
Fit the drain pan and the lower panel.
Cover the components (except the drain pan) with a vinyl sheet to avoid splashing with cleaning water.
Use a brush to clean any dust from the interior surface of the heat exchanger and the fins. To do so, brush downwards and
collect all of the dust in a bucket or cardboard box.
Spray cleaning water over the fins from the rear of the heat exchanger.
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