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8.2.3 Defrost (only available to heating mode)
8.2.3.1 Defrosting Conditions
Starting Of Defrosting Condition (meet one of the following is ok):
(1)Accumulated time when temperature of outdoor heat exchanger coil T3 is below
3
°C reaches to 40 minutes, then consecutive 3 minutes less than -5 degrees (Just for
the AC is turn on , whether or not the heating mode the temperature was detected,
start to statistical time when reach the temperature condition . Shut down or defrosting
calculate time again ).
(2) Accumulated time when temperature of outdoor heat exchanger coil T3 is below
3
°C reaches to 60 minutes, then consecutive 3 minutes less than -4 degrees (Just for
the AC is turn on , whether or not the heating mode the temperature was detected,
start to statistical time when reach the temperature condition . Shut down or defrosting
calculate time again).
(3) Accumulated time when temperature of outdoor heat exchanger coil T3 is below
3
°C reaches to 80 minutes, then consecutive 3 minutes less than -2 degrees (Just for
the AC is turn on , whether or not the heating mode the temperature was detected,
start to statistical time when reach the temperature condition . Shut down or defrosting
calculate time again).
(4) Under evaporator high temperature protection, the accumulated time when
outdoor fan motor is off and compressor is on reaches up to over 90 minutes .( Shut
down or defrosting or T3 is over 15
°C, calculate time again.)
8.2.3.2 Defrosting Action
Four-way valve, indoor fan, outdoor fan are shut down. Compressor keeps on.
Condition
Indoor fan speed
Room temperature up
T2<25°C
Off
25°C <T2<32°C
Low
T2>32°C
Set fan speed
Room temperature down
T2>22
°C
Set fan speed
22
°C >T2>20°C
Low
T2<20°C
Off
