PMML0251A rev.2 - 02/2013
Automatic controls
15
ENGLISH
8 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.
Operation may stop for 6 minutes maximum to protect compressor.
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 Re-
start is required after periods of lost power supply in excess of 2
seconds please contact your distributor (optional function).
Slow air control during heating operation
Can be setting than when the compressor is stopped while the
thermostat is OFF, or the system is performing the automatic de-
frosting operation, the fan speed is set at the slow position.
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 opera-
tion, 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 lover is xed horizontally.
9 BASIC TROUBLESHOOTING
C A U T I O N
When water leakage from the indoor unit occurs, stop the opera-
tion and contact your contractor
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 ow may be heard.
• Smells from Indoor Unit
Smell adheres on indoor unit after a long period of time. Clean the
air lter and panels or make a good ventilation.
• Steam from Outdoor Heat Exchanger
During defrosting operation, ice on the outdoor heat exchanger is
melted, resulting in making steam.
• Dew on Air Panel
When the cooling operation continues for a long period of time
under high humidity conditions (higher than 27°C DB/80% R.H.),
dew can form on the air panel.
• Dew on Cabinet
When the cooling operation continues for a long period of timer
(higher than 27°C DB/80% R.H.), dew can form on the cabinet.
• Sound for the indoor unit heat exchanger
During the cooling operation, a sound may be heard from the in-
door unit heat exchanger due to water freezing or melting.
No operation
Check whether the SET TEMPERATURE is set at the correct
temperature.
Not cooling well or heating well
- Check for obstruction of air ow of the outside or inside
units.
- Check if too much heat source exists in the room.
- Check if the air lter 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 operat-
ing range.
Abnormal swing louver’s position
Check if the four louver’s position at the air outlet are in same
position.
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
N O T E
Except for a long period of shutdown, keep the main switch ON,
since the oil heater is energised when the compressor is stopped.
_PMML0251A_r2.indb 15 06/02/2013 9:04:51
