Hitachi RAC-18G5, Service Manual

Page: 45 / 53

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SERVICE CALL Q & A
While cooling, the compressor sometimes
stops abruptly.
Q1
Check whether frost sticks on the heat
exchanger of indoor unit or not.
Wait for 3 – 4 minutes until the frost melts.
A1
Cooling operation
The fan speed does not change during
a dehumidifying operation.
Q2
Dehumidifying operation
The fan speed is always LO at a dehumidifying
operation.
A2
Cold air comes out during a dehumidifying
operation.
Q3
To improve the dehumidi-fi cation effi ciency, LO
fan speed operation is performed. Therefore
the air is cold. This is not a trouble.
A3
The operation does not stop even by
raising the room temperature setting
of remote control at a dehumidifying
operation.
Q4
At a dehumidifying operation, the actual room
temperature is compared with the room temperature
setting when starting the operation and the
operation is as follows.
1) When actual room temperature > room
temperature setting.
The operation is according to the room
temperature setting on the remote controller.
2) * When actual room temperature < room
temperature setting
Regardless of the room temperature setting,
the temperature is automatically set slightly
lower than the room temperature.
In this case, the status is as 2) and, therefore,
the operation by the room temperature control is
impossible. Turn off the On / OFF switch, set the
room temperature to a new value and turn on the
operation by the On / Off switch.
A4
In the dehumidifying mode, the temperature
set by remote controller is set slightly
higher than the room temperature but the
operation starts.
Q5
This is the status in 2) of (A4). The
temperature is set a little lower than the room
temperature to carry out a dehumidifying
operation as far as possible.
A5