Panasonic CS-C12PKV, Service Manual

Page: 74 / 114

74
RPM shift
+0
+20
+40
+70
(ID temp) Pipe
6.0°C
4.0°C
2.0°C
5.0°C
7.0°C
3.0°C
Compressor starts for ≥ 5 minutes
▲ T ≤ 2.5°C for 2 minutes
Compressor
OFF
Compressor
restart
▲ T = Intake air temperature – Indoor heat exchanger temperature
14.5 Freeze Prevention Control
•
To protect indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid form return to
compressor.
•
This control will activate when temperature of indoor heat exchanger falls below 2°C continuously for more than 4
minutes and compressor turn off.
10 Recovery
4 min
2
Indoor Heat
Exchanger
Temperature
(°C)
Compressor OFF
•
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 as below figure: (Applicable for C9PKV and C12PKV
ONLY)
•
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.
14.6 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.
•
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 turn OFF with TIMER LED blinks.
•
The 5 Times counter can be reset when either one of the following condition happen:
o
Unit is OFF by remote control or AUTO OFF/ON button.
o
Indoor intake temperature – Indoor piping temperature > 5°C for one minute or more.
o
Operation mode change.
•
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:
o
Indoor intake temperature – Indoor piping temperature > 5°C for one minute or more.
o
Power supply reset.