Precautions During Heavy Repair - Kenmore RFP74KB Series Service Manual

11. Cooling Cycle Heavy Repair

11-2. Precautions During Heavy Repair

Items
Use of tools.
Removal of retained
refrigerant.
Replacement of dryer.
Nitrogen blowing
welding.
Others.
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.
1) Use special parts and tools for R-134a or R-600a
1) Remove retained refrigerant more than 5 minutes after turning off
a refrigerator. (If not, oil will leak inside.)
2) Remove retained refrigerant by cutting first high pressure side
(dryer part) with a nipper and then cut low pressure side.
(If the order is not observed, oil leak will happen.)
1) Be sure to replace dryer when repairing pipes
and injecting refrigerant.
1) Weld under nitrogen atmosphere in order to prevent oxidation
inside a pipe. (Nitrogen pressure : 0.1~0.2 kg/cm2.)
1) Nitrogen only should be used when cleaning inside of cycle pipes
inside and sealing.
2) Check leakage with an electronic leakage tester.
3) Be sure to use a pipe cutter when cutting pipes.
4) Be careful not the water let intrude into the inside of the cycle.
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Precautions
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