LG GR-K192AF Service Manual - Page 37

Major repair method for freezing cycle 8-3. Caution during major repair Item 1. Using tools 2. Removing residual refrigerant Caution 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.) Evaporator Evaporator Low pressure side 2 Condenser Drier High pressure 3-Way side 1 Valve Hot Line Pipe 3. Exchanging drier 4. Welding nitrogen substitute 5. Others 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/cm2) 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. - 37 -