Cooling Cycle Heavy Repair; Summary Of Heavy Repair - Daewoo FRU-5711-FRS-U20DA Series Service Manual

10. COOLING CYCLE HEAVY REPAIR

10-1. Summary of Heavy Repair

Process
Remove
* Cut charging pipe ends (Comp. & Dryer) and
refrigerant
Residuals
* Confirm refrigerant (R-134a or R-600a) and oil for
Parts
* Confirm N2 sealing and packing conditions before use.
replacement
and welding
* Weld under nitrogen gas atmosphere.
* Repair in a clean and dry place.
* Evacuate for more than forty minutes after connecting
Vacuum
* Weigh and control the bombe in a vacuum conditions
Refrigerant
charging and
charging
* Charge while refrigerator operates).
inlet welding
* Weld carefully after inlet pinching.
* Check leak at weld joints.
Check
* Check cooling capacity
refrigerant leak
and cooling
capacity
* Remove flux from the silver weld joints with soft
Compressor
compartment
and tools
*Clean tools and store them in a clean tool box
arrangement
* Installation should be conducted in accordance with
Transportation
and
installation
discharge refrigerant from drier and compressor.
compressor and drier.
Use good one for welding and assembly.
manifold gauge hose and vacuum pump to high (drier)
and low (compressor) pressure sides.
with electronic scales and charge through compressor
inlet (Process tube).
Note :Do not use soapy water for check.
→ Check condenser manually to see if warm.
→ Check hot pipe manually to see if warm.
→ Check frost formation on the whole surface of the
evaporator.
brusher wet rag. (Flux may be the cause of corrosion
and leaks.)
or in their place.
the standard installation procedure. (Leave space of
more than 5 cm from the wall for compressor
compartment cooling fan mounted model.)
Contents
75
Tools
* Nipper, side cutters
* Pipe Cutter, Gas welder,
N2 gas
* Vacuum pump
, Manifold gauge.
* Bombe (mass cylinder),
refrigerant manifold gauge,
electronic scales, punching
off flier, gas welding machine
* Electronic Leak Detector,
Driver.
* Copper brush, Rag, Tool box