(1) Use the inverter to control energy saving. The operating mode of the room air conditioner for one year is basically running under light load. The capacity control of the frequency converter reduces the compressor capacity as the load drops, thereby maintaining a balance with the load. In the case where the inverter speed is reduced by the inverter inverter control, since the relative ratio of the heat exchanger is increased with respect to the compressor capacity, it is efficient operation, especially at a light load.

(2) Reduced compressor ON/OF loss. Since the air conditioner controlled by the frequency converter can be adapted to the load by frequency conversion, the number of times of compressor opening and stopping can be reduced, and the loss caused by the refrigerant pressure change of the refrigeration circuit can be reduced.

(3) Improved comfort. Compared with the conventional heat pump air conditioner, when the inverter is installed, the compressor speed increases when the outdoor temperature drops and the load increases, which can improve the heating effect.

(4) Poor ability to eliminate areas of 50/60 Hz. Since the air conditioner controlled by the inverter is in principle changed from AC to DC and then to AC, it has the maximum capability regardless of the regional difference between 50 Hz and 60 Hz.

(5) The starting current is reduced. When the air conditioner controlled by the inverter restarts the compressor, the lower voltage and frequency are selected to suppress the starting current, and the required starting torque is obtained, so that the increase of the predetermined on current can be prevented.