Oil Restoration Operation; Compressor Warm-Up Control Logic - LG Multi-Inverter Type Service Manual

Part 3 Control logic

9. Oil restoration operation

1) When the accumulated compressor running time is over 3 hr.(option), oil restoring operation is made for 3 minutes.
If itʼs on the way of compressor starting,itʼs made after the starting.
2) Accumulated running time is cleared after the defrosting and oil restoring operation.
Operating process :
1) Fully open all the indoorʼs LEV.
2) After the LEV opening,change the compressor step to 70 Hz(option)
3) Reversing valve will be same as in defrosting process.
4) Outdoor fan operates in low speed.
5) During this operation, if operating frequency should be changed by safety control. then follow safety control first. If
compressor should be OFF by that,stop operation.
6) The LEV openings after this operation is 120% of the opening at the point of starting.
10. Compressor warm-up control logic (at low temperatures)
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
-5˚C ≤ OD temp. < 0˚C
starting
Comp.
15Hz
starting
LEV
Opening target : 0.7
0 sec.
90 sec.
Time (option)
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Only for training and service purposes
-10˚C ≤ OD temp. < -5˚C
starting
15Hz
starting
Opening target : 0.7
0 sec.
180 sec.
Time (option)
- 34 -
OD temp. < -10˚C
15Hz
Opening target : 0.7
0 sec.
Time (option)
starting
starting
300 sec.
LGE Internal Use Only