23
TROUBLE DIAGNOSIS
1-2. Summary Of Heavy Repair
Process
Contents
Tools
Trouble
diagnosis
Remove refrigerant
Residuals
- Cut charging pipe ends and discharge refrigerant from
drier and compressor.
Filter, side cutters
Parts
replacement
and welding
Vacuum
- 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. (N 2 gas
pressure: 0.1-0.2kg/cm 2).
- Repair in a clean and dry place.
Pipe Cutter, Gas welder, N2
gas
- 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.
Vacuum pump R134a
exclusively, Manifold gauge.
Refrigerant
charging and
charging
inlet welding
- 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.
R134a exclusive charging
canister (mass cylinder),
refrigerant R134a manifold
gauge, electronic scales, pinch-
off plier, gas welding machine
Compressor
compartment
and tools
arrangement
Transportation
and
installation
- 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.
Copper brush, Rag, Tool box
Check
refrigerant leak
and cooling
capacity
- 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.
②
Check hot line pipe manually to see if warm.
③
Check frost formation on the whole surface of the
evaporator.
Electronic Leak Detector, Driver
(Ruler).
