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20 . Defrosting control
• While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing,
reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit.
• Defrosting control is available 50 minutes later since heating cycle started and the pipe temperature of out-
door unit reaches below -6°C.
50 min
Operating
Setting frequency
frequency
of compressor
4 Way valve
Outdoor fan
Setting speed
Indoor fan
Preheat LED
15 sec
15 sec
Fh min step
ON
ON
OFF
8 min or
over 30˚C(120sec)
30 sec
(FhMAX-2 or
Fh min
FhMAX-3)
OFF(Cooling cycle)
OFF
ON
-24-
30 sec
1 min
Fh+1
OFF
ON(Heating cycle)
Low
Setting
frequency
ON
Setting
speed
OFF
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Troubleshooting
