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Major repair method for freezing cycle
8-4. Actual major repair work
Item
1. Removing residual
refrigerant
2. Nitrogen blowing welding
(Welding nitrogen
substitute)
Low pressure
side
2
Condenser
1. When removing the residual refrigerant always turn the refrigerator off and then wait for
more than 5 minutes. (If you work before waiting 5 minutes, the internal oil can leak
out.)
2. When removing the refrigerant, first cut the 1. high pressure side (drier part) with a
nipper and secondly cut the 2. low pressure side to slowly remove the residual
refrigerant.
Low pressure
side
2
Condenser
Exchanging drier
After assembling the drier, blow the nitrogen gas to the high pressure side (0.1-0.2kg/cm
and do the welding on part 1 and 2.
Exchanging compressor
Blow the nitrogen gas to the low pressure side and then do the welding on part 1 and 2.
Note) The heating time during welding for other parts is very short and the possibility of
forming an internal oxidization scale is very low. Exclude the nitrogen blowing for
other parts.
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Caution
Evaporator
Maintain refrigerant
removing order
Drier
(Oil can leak from
compressor)
High pressure
3-Way
side
Valve
1
Hot Line Pipe
Evaporator
If you do not blow the
nitrogen while welding, it
Drier
can form oxidization
High pressure
3-Way
scale and have a
Valve
side
1
negative effect on
product performance and
reliability.
Hot Line Pipe
Key Point
Key Point
)
2
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