The air-cooled chiller is mainly composed of compressor, condenser, filter, expansion valve, evaporator, air filter, blower. The liquid refrigerant enters the evaporator after being throttled by the expansion valve, where it evaporates and absorbs the heat of the cooled air, then inhaled by the compressor via the return pipe, superheated steam that is compressed to become high temperature and high pressure , cooled by outdoor air after entering the condenser, then delivered to the expansion valve through a dry filter, going to the next cycle. This continuous cycle will cool the room and maintain the proper air conditioning temperature.