3-2. Summary Of Heavy Repair
TROUBLE DIAGNOSIS
- 85 -
Process Contents Tools
- Cut charging pipe ends and discharge refrigerant from Filter, side cutters
drier and compressor.
- Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N
2 gas
- Confirm N
2 sealing and packing conditions before use.
Use good one for welding and assembly.
- Weld under nitrogen gas atmosphere. (N
2 gas pressure:
0.1-0.2kg/cm
2
).
- Repair in a clean and dry place.
- Evacuate for more than forty minutes after connecting Vacuum pump R134a
manifold gauge hose and vacuum pump to high (drier) exclusively, Manifold gauge.
and low (compressor refrigerant discharging parts)
pressure sides.
- Evacuation Speed:113 liters/minute.
- Weigh and control the allowance of R134a charging R134a exclusive charging canister
canister in a vacuum conditions to be ±5 g with (mass cylinder), refrigerant
electronic scales and charge through compressor inlet R134a manifold gauge,
(Charge while compressor operates). electronic scales, pinch-off
- Weld carefully after pinching off the inlet pipe. plier, gas welding machine
- Check leak at weld joints. Electronic Leak Detector,
Minute leak : Use electronic leak detector Driver (Ruler).
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 Copper brush, Rag, Tool box
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.
Trouble
diagnosis
Remove refrigerant
Residuals
Parts
replacement
and welding
Compressor
compartment
and tools
arrangement
Transportation
and
installation
Check
refrigerant leak
and cooling
capacity
Vacuum
Refrigerant
charging and
charging
inlet welding
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