Hitachi RAS-18YH4 Service Manual page 65

AUTO FRESH DEFROSTING
Q8
After the ON/OFF button is pressed
to stop heating, the outdoor unit is
still working with the OPERATION
lamp lighting.
AUTO OPERATION
Fan speed does not change when
Q9
fan speed selector is changed
during auto operation.
NICE TEMPERATURE RESERVATION
Q10
When on-timer has been
programmed, operation starts before
the preset time has been reached.
Q11
Does Nice temperature reservation
function operate during dehumidifying?
Q12
Even if the same time is preset,
the operation start time varies.
INFRARED REMOTE CONTROL
Q13
Timer cannot be set.
Q14
The current time display
disappears soon.
Q15
The timer has been programmed,
but the preset time disappears.
A8
Auto Fresh Defrosting is carried out : the
system checks the outdoor heat exchanger
and defrosts it as necessary before stopping
operation.
A9
At this point fan speed is automatic.
A10
This is because Nice temperature reservation
function is operating. This function starts
operation earlier so the preset temperature is
reached at the preset time. Operation may start
maximum 60 minutes before the preset time.
A11
It does not work. It works only during cooling
and heating.
A12 This is because Nice temperature reservation
function is operating. The start time varies
according to the load of room. Since load varies
greatly during heating, the operation start time is
corrected, so it will vary each day.
A13
Has the clock been set? Timer cannot be set
unless the clock has been set.
A14
The current time disappears
in approx. 10 seconds. The
time set display has priority.
A15
Is the current time past the preset time?
When the preset time reaches the current
time, it disappears.
– 68 –
When the current time is
set the display flashes for
approx 3 minutes.