Panasonic CS-YW9GKE, Service Manual

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12.5.5. 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 (cooling mode) or less for continuous 2 minutes, compressor will stop and restart automatically.
• Time Delay Safety Control is activated before the compressor restart.
V
T = Intake air temperature - Indoor heat exchanger temperature
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
12.5.6. Starting Current Control
• When the compressor, outdoor fan motor and indoor fan motor are simultaneously started, the indoor fan motor will start to
operate at 1.6 second later.
• The reason of the difference is to reduce the starting current flow.
12.5.7. Dew Prevention Control
• Purpose is to prevent dew formation on indoor unit air discharge area.
• When room temperature is constant (±1
°
C) the following conditions occur for 30 minutes continuously, anti-dew formation will
activate:
- Remote Control setting temperature is less than 25
°
C.
- Compressor is on.
- Cooling operation mode.
- Indoor fan motor operate at Low fan speed (CLo, Lo- or QLo).
• This control is cancelled immediately when above condition is changed, or Powerful button is pressed.
• Anti-Dew formation is control by:
1. CLo fan is changed to HLo fan.
(For 12.5.8 to 12.5.16 information applies only to Heating Operation)
12.5.8. Restart Control (Time Delay Safety Control)
• When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
- 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.
12.5.9. 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 (heating mode) or less for continuous 2 minutes, compressor will stop and restart automatically.
• Time Delay Safety Control is activated before the compressor restart.
V
T = Indoor heat exchanger temperature - Intake air temperature
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.