Hitachi RAF-25NH5 Instructions De Service page 286

T ST RTING OPER TION
1
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.
(RAF-25NH5, 35NH5, 50NH5)
2
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.
3
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
1
The indoor fan varies
among high air flow,
low air flow and breeze
in the auto fan speed
mode.(Heating
operation)
2
Loud noise from the outdoor unit is
heard when operation is started.
3
Noise from the outdoor unit
occasionally changes.
4
There is a difference between the
set temperature and room
temperature.
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A1
A2
A3
A1
This is because the cool
wind prevention function
is operating, and does
not indicate a fault.
A2
A3
A4
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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.
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.
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.
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.
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.
The compressor rotation speed changes according
to the difference between the thermostat set
temperature and room temperature.
This does not indicate a fault.
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.