LG SxS GR-P247 Service Manual page 101

TROUBLE DIAGNOSIS
3-3. Precautions During Heavy Repair
Items
1. Use of tools.
2. Removal of retained
refrigerant.
3. Replacement of drier.
4. Nitrogen blowing
welding.
5. Others.
1) Use special parts and tools for R134a.
1) Remove retained refrigerant more than 5 minutes after turning off a refrigerator.
(If not, oil will leak inside.)
2) Remove retained refrigerant by cutting first high pressure side (drier part) with a nipper and
then cut low pressure side. (If the order is not observed, oil leak will happen.)
Compressor
2
Low pressure side
1) Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant.
1) Weld under nitrogen atmosphere in order to prevent oxidation inside a pipe.
(Nitrogen pressure : 0.1~0.2 kg/cm
1) Nitrogen or refrigerant R134a only should be used when cleaning inside of cycle pipes
inside and sealing.
2) Check leakage with an electronic leakage tester.
3) Be sure to use a pipe cutter when cutting pipes.
4) Be careful not the water let intrude into the inside of the cycle.
Precautions
Condenser
1
.)
2
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Evaporator
Drier
High pressure side