Service Manual 95
Inv Compressor
Fan
Main LEV
4way valve
Subcooling LEV
37Hz + 37Hz 90Hz + 90Hz 20Hz + 20Hz
0Hz
Full open
On → off
min.
StartingComponent
Hot gas bypass
valve
On
High pressure
control
Full open
Off
min.
Running
On
High pressure
control
Base pulse
On
min.
Ending
On
Fan Off
StartingIndoor unit
Thermo on unit
LEV
Oil return
pulse
Off
Running
Oil return operation
pulse
Off
Ending
Return to
base pulse
Thermo off unit
LEV
Heating close pulse
Oil return operation
pulse
Heating close pulse
Function
2.2 Defrost control
Start conditions
Defrost control starts if one of below conditions are satisfied.
1) Case 1 : DIP switch 1,2 ON
-2°C ≤ air temp. : hex pipe temp < -7°C
-7°C < air temp. < -2°C : hex pipe temp < (air temp. -9°C)
air temp. ≤ -7°C : hex pipe temp < (air temp. -11°C)
2) Case 2 : DIP switch 1 or 2 OFF
0°C ≤ air temp. : hex pipe temp < -7°C
-5°C < air temp.<0°C : hex pipe temp < (air temp. -9°C)
air temp. ≤ -5°C : hex pipe temp < (air temp. -11°C)
■ Ending condition
1) All Heat exchanger pipe temperature are above 15˚C for 30 sec.
2) The running time of defrost operation is over 30% of the total heating time
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