LG LSC27990TT Service Manual page 77

TROUBLE DIAGNOSIS
3-2. Summary Of Heavy Repair
Process Contents Tools
Filter, side cutters
Pipe Cutter, Gas welder, N2 gas
IIIIII
- Cut charging pipe ends and discharge refrigerant from
drier and compressor.
- Use R134a oil and refrigerant for compressor and drier
- Confirm N2 sealing and packing conditions before use.
Use good one for welding and assembly.
- Weld under nitrogen gas atmosphere. (N2 gas pressure:
0.1-0.2kg/cm2).
- Repair in a clean and dry place.
- Evacuate for more than forty minutes after connecting
manifold gauge hose and vacuum pump to high (drier)
and low (compressor refrigerant discharging parts)
pressure sides.
- Evacuation Speed:113 liters/minute.
- Weigh and control the allowance of R134a charging
canister in a vacuum conditions to be +5 g with
electronic scales and charge through compressor inlet
(Charge while compressor operates).
- Weld carefully after pinching off the inlet pipe.
- Check leak at weld joints.
_ Minute leak : Use electronic leak detector
Big leak : Check visually.
Note:Do not use soapy water for check.
- Check cooling capacity
_1 Check radiator manually to see if warm.
,12; Check hot line pipe manually to see if warm.
(3;Check frost formation on the whole surface of the
evaporator.
- Remove flux from the silver weld joints with soft brush
or wet rag. Flux may be the cause of corrosion and
leaks.
- Clean R134a exclusive tools and store them in a clean
tool box or in their place.
- Installation should be conducted in accordance with the
standard installation procedure. Leave space of more
than 5 cm (2 inches) from the wall for compressor
compartment cooling fan mounted model.
Vacuum pump R134a
exclusively, Manifold gauge.
R134a exclusive charging canister
(mass cylinder), refrigerant
R134a manifold gauge,
electronic scales, pinch-off
plier, gas welding machine
Electronic Leak Detector,
Driver (Ruler).
Copper brush, Rag, Tool box
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