LG LRSPC2031BS Service Manual page 88

TROUBLE DIAGNOSIS
3-2. Summary Of Heavy Repair
Process
Trouble
diagnosis
Remove refrigerant
Residuals
Parts
replacement
and welding
Vacuum
Refrigerant
charging and
charging
inlet welding
Check
refrigerant leak
and cooling
capacity
Compressor
compartment
and tools
arrangement
Transportation
and
installation
Contents
- Cut charging pipe ends and discharge refrigerant from
drier and compressor.
- Use R134a oil and refrigerant for compressor and drier
- Confirm N sealing and packing conditions before use.
2
Use good one for welding and assembly.
- Weld under nitrogen gas atmosphere.(N
0.1-0.2kg/cm 2 ).
- 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:113l/min.
- Weigh and control the allowance of R134a bombe in a
vacuum conditions to be ±5 g with electronic scales and cylinder), refrigerant(R134a)
charge through compressor inlet
(Charge while refrigerator operates).
- Weld carefully after inlet pinching.
- Check leak at weld joints.
Minute leak: Use electronic leak detector
Big leak: Check visually or fingers.
Note:Do not use soapy water for check.
- Check cooling capacity
Check radiator manually to see if warm.
Check hot line pipe manually to see if warm.
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 from the wall for compressor compartment
cooling fan mounted model.)
gas pressure:
2
- 88 -
Tools
Filter, side cutters
Pipe Cutter, Gas welder, N
Vacuum pump(R134a
exclusively), Manifold gauge.
R134a exclusive bombe(mass
manifold gauge, electronic
scales, punching off flier,
gas welding machine
Electronic Leak Detector,
Driver(Ruler).
Copper brush, Rag, Tool box
gas
2