| 摘要 |
PURPOSE:To determine a frequency through a simple and inexpensive controlling method and perform favorable operation control, by providing a pressure- detecting circuit, a frequency-controlling circuit controlled by an output from a comparing circuit in a room, an inverter for performing control according to an output from the frequency-controlling circuit, and a compressor connected to the inverter. CONSTITUTION:Digital signals emitted by the functions of a temperature- detecting circuit 28 and a temperature set point emitting circuit 29 are sent to a comparing circuit 30, where room temperature and a room temperature set point are compared with each other, 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 the 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 an output from the circuit 34 outputs a signal to the compressor 18 through a connecting line 37, thereby controlling the compressor 18.
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