DAEWOO ELECTRONICS FRN-U20IC, Service Manual, Page: 56 / 83

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7-1. Summary of Heavy Repair
* 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.)
Transportation
and
installation
* Copper brush, Rag, Tool box
* Remove flux from the silver weld joints with soft
brusher wet rag. (Flux may be the cause of corrosion
and leaks.)
*Clean tools and store them in a clean tool box
or in their place.
Compressor
compartment
and tools
arrangement
* Electronic Leak Detector,
Driver.
* Check leak at weld joints.
Note :Do not use soapy water for check.
* Check cooling capacity
→
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.
Check
refrigerant leak
and cooling
capacity
* Bombe (mass cylinder),
refrigerant manifold gauge,
electronic scales, punching
off flier, gas welding machine
* Weigh and control the bombe in a vacuum conditions
with electronic scales and charge through compressor
inlet (Process tube).
* Charge while refrigerator operates).
* Weld carefully after inlet pinching.
Refrigerant
charging and
charging
inlet welding
* Vacuum pump
, Manifold gauge.
* Evacuate for more than forty minutes after connecting
manifold gauge hose and vacuum pump to high (drier)
and low (compressor) pressure sides. Vacuum
* Pipe Cutter, Gas welder,
N2 gas
* Confirm refrigerant (R-134a or R-600a) and oil for
compressor and drier.
* Confirm N2 sealing and packing conditions before use.
Use good one for welding and assembly.
* Weld under nitrogen gas atmosphere.
* Repair in a clean and dry place.
Parts
replacement
and welding
* Nipper, side cutters
* Cut charging pipe ends (Comp. & Dryer) and
discharge refrigerant from drier and compressor.
Remove
refrigerant
Residuals
Tools Contents Process
7. COOLING CYCLE HEAVY REPAIR