Hitachi RCI Service Manual page 388

12 Maintenance notes
Spray cleaning water over the heat exchanger fins.
C A U T I O N
If you are using a cleaning product, wash the heat exchanger
fully with clean water.
Cover the wiring connectors with insulating tape.
Close the control tape if open.
Set the water pump pressure to between 2.5 and 5 kg/cm
protect the fins.
Start the water pump.
Connect the drain piping and remove the insulating tape from the
wiring connectors.
Work and checks after cleaning
1 Connect the drain piping and remove the insulating tape from the wiring connectors.
2 Remove the vinyl sheets.
3 Fit the front panel.
4 Measure the electrical box terminal board insulation using a megohmmeter, check that the insulation is over a 1 MΩ on
applying 500 V.
N O T E
The cleaning product is neutral. However, after it has been used the cleaning water may no longer be neutral.
5 Collect the cleaning water and apply the neutralisation treatment once you have disposed of it.
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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