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13.20 Compressor Reverse Rotation Protection Control
• If the compressor is operating continuously for 5 minutes or longer and the temperature difference between
intake air and indoor heat exchanger is 2.5°C or less for continuous 2 minutes, compressor will stop and restart
automatically.
• Time Delay Safety Control is activated before the compressor restart.
s T = Intake air temperature - Indoor heat exchanger temperature
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
13.21 Dew Prevention Control
• To prevent dew formation at indoor unit discharge area.
• This control starts if:
o Cooling mode or Quiet mode is activated.
o Remote Control setting temperature is less than 25°C.
o Fan speed is at Lo or QLo.
o Room temperature is constant (±1°C) for 30 minutes.
o Compressor is continuously running.
• Fan speed, angle of horizontal louver (vertical airflow angle) and angle of vertical louver (horizontal airflow angle)
will be adjusted accordingly in this control.
o Fan speed will be increased slowly if the unit is in quiet mode and Lo fan speed.
o The angle of horizontal louver will be changed as table below:
o The angle of vertical louver will be changed as table below:
• Dew prevention stop condition
o Remote control setting temperature is more than 25°C.
o Fan speed is not set to Lo or QLo.
o Select Powerful operation.
(For 13.22 to 13.23 information applies only to Heating Operation)
13.22 Restart Control (Time Delay Safety Control)
• When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
o Heating operation - the compressor stops for 3 minutes (minimum) before resume operation.
• If the operation is stopped by the remote control, the compressor will not turn on within 3 minutes from the
moment operation stop, although the unit is turn on again within the period.
• This phenomenon is to balance the pressure inside the refrigerant cycle.
13.23 Compressor Reverse Rotation Protection Control
• If the compressor is operating continuously for 5 minutes or longer and the temperature difference between
indoor heat exchanger and intake air is 5°C or less for continuous 2 minutes, compressor will stop and restart
automatically.
• Time Delay Safety Control is activated before the compressor restart.
s T = Indoor heat exchanger temperature - Intake air temperature
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
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