LG FM15AH UL3, Svc Manual

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Only for training and service purposes
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Part 3 Control logic
1) When the accumulated compressor running time is over 3 hr.(option), oil restoring operation is made for 3 minutes.
If it’s on the way of compressor starting,it’s made after the starting.
2) Accumulated running time is cleared after the defrosting and oil restoring operation.
Operating process :
1) Fully open all the indoor’s 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.
9. Oil restoration operation
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
10. Compressor warm-up control logic (at low temperatures)
Comp.
Opening target : 0.7
LEV
0 sec. 0 sec. 0 sec.
90 sec.
180 sec.
300 sec.
15Hz
15Hz
15Hz
Opening target : 0.7
Opening target : 0.7
Time (option) Time (option) Time (option)
starting
starting
starting starting
starting starting
-5˚C
≤
OD temp. < 0˚C -10˚C
≤
OD temp. < -5˚C OD temp. < -10˚C