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13.24 Overload Protection Control
• Outdoor Fan Control
o If the temperature of the Outdoor Heat Exchanger less than -3°C, Outdoor Fan is ON. The Outdoor Fan stop,
when Outdoor Heat Exchanger temperature is Tb or more according to Outdoor Air Temperature region as
table below:
The Outdoor Fan restarts when the indoor heat exchanger temperature falls to 49°C.
Outdoor Air
Temperature
< 10°C ≥ 10°C ~ < 15°C ≥ 5°C ~ < 20°C ≥ 20°C ~ < 25°C ≥ 25°C
Tb ≥ 5°C ≥ 3°C ≥ 1.5°C ≥ 0.5°C ≥ -0.5°C
Outdoor Fan
OFF
During starting of Heating mode and after deice, Outdoor Fan ON for 90 sec. (Hi).
• Compressor High Pressure Control
o If the indoor heat exchanger becomes 68°C or more, the compressor will stop and restart automatically.
o Time Delay Safety Control is activated before the compressor restart.
13.25 4-Way Valve Control
• 4-way valve always on during Heating operation. (except deicing operation)
• When the unit is switched off by remote control during Heating operation, the 4-way valve stay at Heating
position for 5 minutes.
• This is to prevent the refrigerant flow process sound for being occur.
13.26 Hot Start Control
• Hot start control is to prevent cool air discharge into room when heating operating starts.
• Hot start is executed after heating operation starts and deice operation is completed.
• Indoor fan control during hot start is shown below:
Indoor Pipe Temperature Indoor Fan
≤ 30°C OFF
30°C < t ≤ 34°C SLo
t ≥ 34°C Lo-
• When indoor pipe temperature over 34°C or maximum 240 seconds, hot start is completed.
• During hot start and for 2 minutes after hot start completed, intake thermostat is ignored and no Thermo OFF.
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