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2. Precautions During Heavy Repair
Items
Use of tools.
Removal of retained
refrigerant.
Replacement of drier.
Nitrogen blowing
welding.
Others.
- 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
(drier part) with a nipper and then cut low pressure side.
(If the order is not observed, oil leak will happen.)
Suction
Compresso
Process
Discharge tube
- Be sure to replace drier when repairing pipes
and injecting refrigerant.
- 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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COOLING CYCLE HEAVY REPAIR
Precautions
Evaporato
Low
pressure
Hot
High Pressure
Condense
Drye
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