LG ATNH126ELFC Service Manual page 144

Outdoor Units
2.2 Oil control
: COMP OIL Equalizing Control (48k, 72k)
: To equalize the oil level in each Compressors.
1) COMP OIL Equalizing Logic
1. When the running time of solo operation of the specific COMP is over 1 hour.
The other compressor will be operated at least for 30 seconds
2. The running time of single operation of the specific COMP includes the time of the COMP ON/OFF
2) The COMP OIL Equalizing Logic is not working in the Defrost mode.
3) When the COMP OIL Equalizing Control of the outdoor unit is started.
1. The outdoor-unit transmits a message of [COMP OIL Equalizing Control] to the indoor_unit in 2 min-
utes.
2. After the maximum 5 seconds the indoor unit ignores the message for 2 minutes as per the LOW
Temp.sensing function.
OIL Equalizing Control mode
The LOW Temp.sensing function :
If the piping Temp. of outdoor_unit is under the –2°C,
This function will wait for 2 minutes before starting the COMP OIL Equalizing Logic.
144 Synchro Air Conditioner
60min
2min
30sec