Compressor Reverse Rotation Protection Control; Starting Current Control - Panasonic CS-W7DKE Service Manual

8.5.4. Anti-Freezing Control
• If the temperature of the indoor heat exchanger falls below 2°C continuously for 4 minutes or more, the compressor turns off.
The fan speed setting remains the same.
• This phenomenon is to protect the indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid form
returning to the compressor.
• Compressor will restart again when the indoor heat exchanger temperature rises to 10°C (Recovery).
• Restart control (Time Delay Safety Control) will be applied in this Control if the recovery time is too short.
8.5.5.

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.
L T = Intake air temperature - Indoor heat exchanger temperature
• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
8.5.6.

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.
8.5.7. Anti-Dew Formation 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.
2. QLo fan is changed to HLo fan.
CS-W7DKE CU-W7DKE / CS-W9DKE CU-W9DKE / CS-W12DKE CU-W12DKE
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