8-3. Caution during major repair
Major repair method for freezing cycle
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1) Use the parts and tools for R134a.
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 remove the residual refrigerant.
(You must do it in this order. If this order is reversed a great amount of oil can leak out.)
1) During piping repair and inserting the refrigerant, always use the drier for R134a.
1) To prevent the oxidization scale from forming within the pipe, weld it while substituting
the nitrogen with a constant pressure within the piping. (nitrogen pressure:
0.1-0.2kg/cm
2
)
1) Internal cleaning and sealing within the cycle pipe should be done with nitrogen gas or
R134a refrigerant.
2) When checking for leakage, use the electric leakage detector.
3) When cutting the pipe, always use the pipe cutter.
4) Be careful not to let moisture penetrate within the cycle.
1. Using tools
2. Removing residual
refrigerant
3. Exchanging drier
4. Welding nitrogen
substitute
5. Others
Item
Caution
2
1
3-Way
Valve
Condenser
Hot Line Pipe
Evaporator
Evaporator
Drier
High pressure
side
Low pressure
side
