Summary Of Heavy Repair - LG LSC26945TT Service Manual

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: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
➀ Check radiator manually to see if warm.
➁ Check hot line pipe manually to see if warm.
➂ 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.
- 84 -
Filter, side cutters
Pipe Cutter, Gas welder, N
gas pressure:
2
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
Tools
gas
2