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Only for training and service purposes
Part 2 Functions & Controls
• Defrosting Control Algorithm
1) Lowering the compressor frequency starts the defrosting operation.
Constant speed compressor is ON 10 seconds.
2) The EEV has an opening 350 pulse (Option) when starting the defrosting operation.
3) Reversing valve is OFF after 5 seconds from the compressor reaching an operating frequency of 30 Hz.
Then the indoor fan turns OFF (including when the indoor unit is OFF, except if the remote controller is OFF).
4) After 5 seconds from the compressor reaching 30Hz, the outdoor unit fan turns off and the Hot gas Bypass/Oil
Separator valve turns OFF.
NOTE: Comp.frequency and EEV pulse is different for each models.
• Control algorithm of defrost completion
1) Frequency of compressor lowers to 30 Hz and maintains constant speed operation at 30 Hz for 75 seconds and
then starts operating. If the constant speed compressor is OFF, it will receive an off receive OFF signal after 5
seconds from the compressor reaching 30 Hz.
2) The EEV will open with the standard previous pulse after 5 seconds from the time the compressor reaches 30
Hz.
3) Reversing valve is ON after 15 seconds from the time the compressor reaches 30 Hz.
4) The indoor unit fan is ON with high speed for 5 seconds from the time the compressor reaches 30Hz.
5) Hot Gas bypass valve/Oil separator bypass valve is OFF after 75 seconds from the time the compressor reach-
es 30Hz.
NOTE: Comp.frequency and EEV pulse is different for each models.