Compressor Reverse Rotation Protection Control; Dew Prevention Control - Panasonic CS-PC12TKF Service Manual

(For PC12TKF)

The current fan speed will change to freeze prevention speed after 70 seconds compressor on. The fan speed
will be increased according to the indoor pipe temperature the figure below:

13.6 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 continuously 2 minutes, compressor will stop and restart
automatically.

Time Delay Safety Control is activated before the compressor restart.
Compressor starts for ≥ 5 minutes
▲T ≤ 2.5°C for 2 minutes
▲ T = Intake air temperature – Indoor heat exchanger temperature

This is to prevent compressor from rotate reversely when there is an instantaneous power failure.

If this condition happens continuously for 5 times within 50 minutes, unit will turns OFF with TIMER indicator
blinks.

The 5 Times counter can be reset when either one of the following condition happen:
Unit is OFF by remote control or AUTO OFF/ON button.
o
Indoor intake temperature – Indoor piping temperature > 5°C for 1 minute or more.
o
Operation mode change.
o

The unit could be ON by pressing OFF/ON button at remote control but the TIMER LED will continue blinking.

TIMER LED blinking will be reset if:
Indoor intake temperature – Indoor piping temperature > 5°C for 1 minute or more.
o
Power supply reset.
o

13.7 Dew Prevention Control


To prevent dew formation at indoor unit discharge area.

This control will be activated if:
Cooling mode.
o
Remote Control setting temperature is less than 25°C.
o
Fan speed is at CLo.
o
Room temperature is constant (±1°C) for 60 minutes (For PC12TKF series) and 30 minutes (For
o
PC18/24TKF series).
Compressor is continuously running.
o

Fan speed will be adjusted accordingly in this control.
Fan speed will be increased slowly.
o

Dew prevention stop condition
Remote control setting temperature is more than 25°C.
o
Fan speed is not set to CLo.
o
RPM shift
(ID temp) Pipe
+0
6.0°C
+20
4.0°C
+40
2.0°C
+70
56
7.0°C
5.0°C
3.0°C
Compressor
OFF
Compressor
restart