LG LSSB2691ST Service Manual page 24

TROUBLE DIAGNOSIS
1-3. Precautions During Heavy Repair
Items
1. Use of tools.
2. Recovery of refrigerant.
3. Replacement of drier.
4. Nitrogen blowing
welding.
5. Others.
1) Use special parts and tools for R134a.
1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off.
2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate
recovery equipment to recover the refrigerant from the system. When the refrigerant has
been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT
TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT.
The use of piercing type valves will allow future servicing and eliminates the possibility of a
defective pinch off.
Compressor
Low pressure side
1) Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant.
1) Use pressurized nitrogen to prevent oxidation inside the piping.
(Nitrogen pressure : 0.1~0.2 kg/cm
1) Only nitrogen or R134a should be used when cleaning the inside of piping of the sealed
system.
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
Drain Pipe
Condenser
2 .)
24
Evaporator
3 way valve
Evaporator
Hot Line
Drier
High pressure side