HEAT PUMP TYPE AIR CONDITIONER

PURPOSE:To determine a frequency through a simple and inexpensive controller and perform favorable operation control, by providing a pressure-detecting circuit, a detecting circuit for outside temperature, a frequency-controlling circuit controlled by an output from a room comparing circuit, an inverter performing control according to an output from the frequency-controlling circuit, and a compressor connected to an inverter. CONSTITUTION:Digital signals emitted by a temperature-detecting circuit 28 and a temperature set point oscillating circuit 29 are sent to a comparing circuit 30, where room temperature and a room temperature set point are compared with each other, and a signal corresponding to the temperature difference is sent from a room controlling circuit 27 to an exterior controlling circuit 32 through a room-exterior connecting line 31. On the exterior side, an output from a temperature-detecting circuit 39 connected to a thermistor 38 for detecting the outside temperature, an output from a pressure-detecting circuit 33 which outputs a digital signal by turning ON and OFF of a pressure switch 36 and an output from the circuit 27 are inputted to the frequency- controlling circuit 34. The inverter 35 controlled by the output from the circuit 34 outputs a signal to the compressore through a connecting line 37, thereby controlling the compressor 18.