Hitachi RAS-50WX8 Service Manual page 22

CAUTION
Cleaning and maintenance must be carried out only by qualified service personal. Before cleaning,
stop operation and switch off the power supply.
3. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD
Running the unit setting the operation mode to
(FAN) and the fan speed to HI for about half
a day on a fine day, and dry the whole of the unit.
Switch off the power plug.
REGULAR INSPECTION
PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER
EVERY HALF YEARLY OR YEARLY. CONTACT YOUR SALES AGENT OR SERVICE SHOP.
Is the earth line disconnected or broken?
1
Is the mounting frame seriously affected by rust and is the
2
outdoor unit tilted or unstable?
Is the plug of power line firmly plugged into the socket?
3
(Please ensure no loose contact between them).
Confirm
Air
Blow
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AFTER SALE SERVICE AND WARRANTY
WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.
CONDITION
If the remote controller is
Do the batteries need replacement?
not transmitting a signal.
Is the polarity of the inserted batteries correct?
Remote controller
display is dim or blank.)
Is the fuse all right?
Is the voltage extremely high or low?
When it does not operate
Is the circuit breaker "ON"?
Is the setting of operation mode different from other indoor units?
Is the air filter blocked with dust?
Does sunlight fall directly on the outdoor unit?
Is the air flow of the outdoor unit obstructed?
Are the doors or windows opened, or is there any source of
When it does not cool well
heat in the room?
When it does not hot well
Is the set temperature suitable?
Are the air inlets or air outlets of indoor and outdoor units
blocked?
Is the fan speed "LOW" or "SILENT"?
Notes
In quiet operation or stopping the operation, the following phenomena may
occassionally occur, but they are not abnormal for the operation.
(1) Slight flowing noise of refrigerant in the refrigerating cycle.
(2) Slight rubbing noise from the fan casing which is cooled and then
gradually warmed as operation stops.
The odor will possibly be emitted from the room air conditioner because the
various odor, emitted by smoke, foodstuffs, cosmetics and so on, sticks to it.
So the air filter and the evaporator regularly must be cleaned to reduce the
odor.
Please contact your sales agent immediately if the air conditioner still fails to operate normally after the above
inspections. Inform your agent of the model of your unit, production number, date of installation. Please also
inform him regarding the fault.
Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the
specified capacity.
NOTE:
If the supply cord is damaged, it must be replaced by the special cord obtainable at authorized
service parts centers.
On switching on the equipment, particularly when the room light is dimmed, a slight brightness fluctuation
may occur. This is of no consequence.
The conditions of the local Power Supply Companies are to be observed.
The moveable panels are not moving
Check to ensure whether the front panels have been installed in a proper manner.
CHECK THE FOLLOWING POINTS
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