LG Universal System Air Conditioner Service Manual page 133

2.4 Sump heating control
2.4.1 Inverter compressor sump heating fuction
: A function protecting inverter compressor from damages, by increasing oil viscosity in low outdoor
temperature.
For the control,compressor operates in low frequencies.
Operating condition :in case of the following 3 conditions are fulfilled at the same time.
- Outdoor temperature, D-pipe temperature, Heat sink temperature : below 0°C,
Comp.
LEV
All Model is fitted with sump heater.
OD temp. < 0 ~ -10°C
15Hz
Opening target : 0.7
0 sec.
starting
starting
90~300 sec.
Time (option)
Outdoor Units
Service Manual 133