Hitachi RAK35NH4 Instruction Manual page 24

AFTER SALE SERVICE AND WARRANTY
WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.
CONDITION
When it does not operate
When it does not cool well
When it does not hot well
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.
Please note:
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.
Note
Avoid to use the room air conditioner for cooling operation when the outside temperature is below
21°C (70°F).
The recommended maximum and minimum operating temperatures of the hot and cold sides
should be as below:
Indoor
Outdoor
Is the fuse all right?
Is the voltage extremely high or low?
Is the circuit breaker "ON"?
Was the air filter cleaned?
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
heat in the room?
Is the set temperature suitable?
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.
Minimum
Dry bulb °C
Wet bulb °C
Dry bulb °C
Wet bulb °C
CHECK THE FOLLOWING POINTS
Cooling
Maximum
21 32
15 23
21 43
15 26
– 23 –
Heating
Minimum Maximum
20 27
12 19
2 21
1 15