LG GR-K192AF Service Manual - Page 38

Major repair method for freezing cycle 8-4. Actual major repair work Item 1. Removing residual refrigerant Low pressure side 2 Caution Evaporator Condenser Drier High pressure 3-Way side Valve 1 Key Point Maintain refrigerant removing order (Oil can leak from compressor) Hot Line Pipe 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. 2. Nitrogen blowing welding (Welding nitrogen substitute) Low pressure side 2 Evaporator Condenser Drier High pressure 3-Way side Valve 1 Hot Line Pipe Key Point If you do not blow the nitrogen while welding, it can form oxidization scale and have a negative effect on product performance and reliability. Exchanging drier After assembling the drier, blow the nitrogen gas to the high pressure side (0.1-0.2kg/cm2) 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. - 38 -