Because the compressor is a mass-produced product, the constant replacement of new refrigerants will bring high costs. In addition, the compressors used in the air-conditioning field are basically rotor type, reciprocating type and scroll type. . There is a misconception in the Chinese market that scrolls are the latest technology, so scroll compressors are the best. In fact, the so-called good and bad things are relative. For example, in hot or cold areas, because the conditions for using air conditioners are different, the compressors selected are not the same. Then the scroll compressor is of the constant volume design type, but if it is faced with overheating or undercooling, it needs to change its design. However, the compressor is a mass-produced product, and it is impossible to always change the design to satisfy one. The use of a small number of requirements, so inevitably there will be cases where it is not applicable during use. The main problem caused by the operation of the air conditioner is that some enterprises did not carry out serious verification work during the development process, ignoring the operating parameters of the system beyond the scope allowed by the corresponding technical specifications, as long as the system can be used under a limited number of working conditions. Operation, can be cooled, heating is qualified, which causes the system to be in the performance margin of the compressor even under normal use conditions, barely maintain the operation, severely unstable operation status. Moreover, the energy-saving advantages of the heat pump system will be better played; when the temperature continues to drop, the other heating methods, such as gas and fuel heating systems, will be used to avoid the heat supply capacity of the heat pump under low-efficiency operating conditions. problem.