8-4. Actual major repair work
Major repair method for freezing cycle
- 38 -
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.
Exchanging drier
After assembling the drier, blow the nitrogen gas to the high pressure side (0.1-0.2kg/cm
2
)
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.
1. Removing residual
refrigerant
2. Nitrogen blowing welding
(Welding nitrogen
substitute)
Item
Caution
2
1
3-Way
Valve
Condenser
Hot Line Pipe
Evaporator
Drier
High pressure
side
Low pressure
side
2
1
3-Way
Valve
Hot Line Pipe
Evaporator
Drier
Condenser
High pressure
side
Low pressure
side
If you do not blow the
nitrogen while welding, it
can form oxidization
scale and have a
negative effect on
product performance and
reliability.
Key Point
Maintain refrigerant
removing order
(Oil can leak from
compressor)
Key Point
