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 C9KKH and C12KKH
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.
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