Liquid refrigerant migration Refrigerant migration refers to the accumulation of liquid refrigerant in the compressor crankcase when the compressor is down. As long as the temperature in the compressor is lower than the temperature in the evaporator, the pressure difference between the compressor and the evaporator will drive the refrigerant to the colder place. In the cold winter, this phenomenon is most likely to occur.
However, for air-conditioning, heat pump devices, when the condensing unit is farther away from the compressor, even if the temperature is high, the migration phenomenon may occur.
When the system is shut down, if you do not boot in a few hours, even if there is no pressure difference, due to the crankcase cooling oil to the refrigerant attraction, the migration phenomenon may occur. If excessive liquid refrigerant migration into the compressor crankcase, in the compressor start-up will occur a serious hydraulic phenomenon, resulting in a variety of compressor faults, such as valve rupture, piston damage, bearing failure and bearing erosion (refrigerant to the frozen oil from the bearing of the wash away).