Hitachi YUTAKI S Serie Manuel D'installation page 16

5. AUTOMATIC CONTROLS
The system is equipped with the following functions:
■
THREE MINUTE GUARD
The compressor remains off for at least 3 minutes once it has
stopped. If the system is started within approximately 3 minutes
after it has stopped, the RUN indicator is activated. However,
the cooling operation or the heating operation remains off and
does not start until after 3 minutes has elapsed.
■
FROST PREVENTION DURING COOLING OPERATION
When the system is operated in a low temperature room, the
cooling operation may be changed to fan operation for a while to
avoid frost formation on the indoor heat exchanger.
■
AUTOMATIC RESTART AFTER POWER FAILURE
If the power supply is interrupted for short periods of time (up
to 2 seconds) the Remote Control switch will retain the settings
and the unit will restart when the power is restored.
If Automatic Restart is required after periods of lost power supply
in excess of 2 seconds please contact your distributor (optional
function).
6. BASIC TROUBLESCHOOTING

CAUTION:
When you smell or white smoke occurs from the unit, stop
the system and contact your contractor.
■
THIS IS NOT ABNORMAL
■ Sound from deforming Part
During system starting or stopping, and abrading sound might
be heard. However, this is due to thermal deformation of
plastic parts. It is not abnormal.
■ Refrigerant Flow Sound
While the system is being started or stopping, sound from the
refrigerant flow may be heard.
■ Steam from Outdoor Heat Exchanger
During defrosting operation, ice on the outdoor heat
exchanger is melted, resulting in making steam.
■ Dew on Cabinet
When the cooling operation continues for a long period of
timer (higher than 27ºC DB/80% R.H.), dew can form on the
cabinet.
■
NO OPERATION
Check whether the SET TEMPERATURE is set at the correct
temperature.
18
PMML0215A rev.1 - 02/2012
■
SLOW AIR CONTROL DURING HEATING OPERATION
When the compressor is stopped while the thermostat is OFF, or
the system is performing the automatic defrosting operation, the
fan speed is set at the slow position or stop.
■
AUTOMATIC DEFROSTING CYCLE
When the heating operation is stopped by pressing RUN/STOP
switch, frosting on the outdoor unit is checked and the defrosting
operation may be performed for the maximum of 10 minutes.
■
PREVENTION OF OVERLOAD OPERATION
When the outdoor temperature is too high during heating
operation, heating operation is stopped due to activation of the
outdoor thermistor until the temperature becomes low.
■
HOT START DURING HEATING OPERATION
To prevent cold air discharge, the fan speed is controlled from
the slow position to the set position according to the discharge
air temperature. At this time the louver is fixed horizontally.
■
COMPRESSOR HOT START
RAS-8~10 HRNME-AF Series does not operate within 4 hours
after power supply (stopagge code d1-22).
In case of operating within 4 hours, see "Test Run" chapter.
■
NOT COOLING WELL OR HEATING WELL
■ Check for obstruction of air flow of the outside or inside units.
■ Check if too much heat source exists in the room.
■ Check if the air filter is clogged with dust.
■ Check to see if the doors or windows are opened or not.
■ Check if the temperature condition is not within the operating
range.
■
IF TROUBLE STILL REMAINS...
If the trouble still remains even after checking the above items,
contact your service contractor and inform the following data:
Unit Model Name
Content of Trouble
Alarm Code no. on Liquid Crystal Display

NOTE:
Except for a long period of shutdown, keep the main
switch ON, since the oil heater is energised when the
compressor is stopped.
AUTOMATIC CONTROLS