LG General Wall Mounted-Inverter Type - Manual (Page 19)

Service Manual 19
Part 2 Functions & Controls
• Defrosting Control Algorithm
1) Lowering the compressor frequency when starts the defrosting operation.
Constant speed compressor is ON after 10 seconds from the arrival time of 30 Hz (Option) frequency and is
speed up its revolution till 100 Hz (Option)
2) Every EEV have 350 pulse (Option) of opening when starts defrosting operation.
3) Reversing valve is OFF after 5 seconds from arriving the compressor operating frequency of 30 Hz and then
fans of indoor units turn OFF.(including the indoor unit with being OFF except the remote controller is being
OFF)
4) After 5 seconds from the time arriving 30 Hz, fans of outdoor unit turn OFF and Hot Gas bypass/Oil separator
valve turn ON.
NOTE: Comp.frequency and EEV pulse is different each models.
• Control algorithm of defrost completion
1) Frequency of compressor lowering to 30 Hz and maintain constant speed operation with 30 Hz for 75 seconds
and then stating operation. If the constant speed compressor is OFF, it will be receive OFF signal after 5 sec-
onds from the arrival time of 30 Hz.
2) The EEV will open with the standard previous pulse after 5 seconds from the time of 30 Hz.
3) Reversing valve is ON after 15 seconds from the time of 30 Hz of compressor frequency.
4) Fan of outdoor unit is ON with high speed and maintain it after 5 seconds from the time of 30Hz.
5) Hot Gas bypass valve/Oil separator bypass valve make OFF after 75 seconds from the time of 30Hz.
NOTE: Comp.frequency and EEV pulse is different each models.