Cooling Cycle Heavy Repair; Summary Of Heavy Repair - Kenmore STEP UP Service Manual

10. Cooling Cycle Heavy Repair

10-1. Summary of Heavy Repair

Process
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
To avoid risk of electrical shock that can cause death or severe personal injury,
WARNING
!
disconnect unit from power before servicing unless tests require power.
Contents
Cut charging pipe ends(compressor & dryer) and
discharge refrigerant from dryer and compressor.
 Confirm refrigerant (R134a or R600a) and oil for
compressor and dryer.
 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.
Evacuate for more than forty minutes after connecting
manifold gauge hose and vacuum pump to high (dryer)
and low (compressor) pressure sides.
 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.
 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.
 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.
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.)
Tools
Nipper, side cutters
Pipe, 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
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