Hitachi RAF-25FX8 Mode D'emploi page 134

AT STARTING OPERATION
Q1
When only the power switch is turned
on, the damper at the bottom air outlet
moves even if the START/STOP
button is not pressed.
Q2
When the heating operation is started,
the indoor fan does not start
immediately and the damper at the
bottom air outlet occasionally does not
open.
Q3
When the unit built behind the gallery
(lattice door) is to be started
immediately after it has stopped, the
unit occasionally will not start.
OTHERS
Q1
The indoor fan varies
among high air flow, low
air flow and breeze in the
auto fan speed mode.
(Heating operation)
Q2
Loud noise from the outdoor unit is
heard when operation is started.
Q3
Noise from the outdoor unit
occasionally changes.
Q4
There is a difference between the set
temperature and room temperature.
A1
To ensere correct opening and closing of the damper,
the damper will move when power is turned on or the
unit is to be operated in order to check its fully opened
and closed positions.
A2
This is because the preheating device is working.
It will not start to drive the fan until the refrigerating
cycle warms up and warm air blows. Wait for a while.
The damper does not open either during preheating
or for one minute after preheating is finished.
A3
Such a phenomenon may occur with built-in
installation where heat is likely to be stuffy. Install the
unit as near to the lattice door as possible so that air is
not short-circuited, or provide a partition between the
unit and lattice door.
A1
This is because the cool
wind prevention function is
operating, and does not
indicate a fault.
A2
When operation is started, the compressor rotation
speed goes to maximum to increase the heating or
cooling capability, so noise becomes slightly louder.
This does not indicate a fault.
A3
The compressor rotation speed changes according to
the difference between the thermostat set temperature
and room temperature.
This does not indicate a fault.
A4
There may be a difference between the set temperature
and room temperature because of construction of
room, air current, etc. Set the temperature at a
comfortable level for the space.
– 152 –
The heat exchanger temperature is
sensed in the auto fan speed mode.
When the temperature is low, the fan
speed varies among high air flow, low air
flow and breeze.