| 摘要 |
PROBLEM TO BE SOLVED: To curtail power during the stand-by time while accurately securing the protection of a compressor in the use of a long piping (multi-refrigerant) for separation type air conditioning equipment. SOLUTION: An inverter for driving a compressor and a compressor temperature sensor 6 are arranged in a refrigeration cycle in which a four-way valve, an outdoor heat exchanger, a capillary tube and a room heat exchanger are connected by piping to an electric compressor having a three-phase winding. A circuit is connected to the compressor temperature sensor 6 to allow switching thereof to a high resistance for low temperature or a low resistance for high temperature detection respectively comprising a resistance 22 and a resistance 23 and a transistor 24. At the start of the operation of air conditioning equipment, a switching is made to the high resistance to detect a voltage and when the detected voltage is below a specified value, a uniphase power is applied to the three-phase winding of the compressor through the inverter and then, when the detected voltage reaches a specified value, the inverter is switched over to a three-phase output operation. Moreover, during the operation a switching is made to the low resistance and when the detected temperature reaches a specified value, the compressor is controlled to stop. |
