| 摘要 |
PURPOSE:To sense an outside air temperature without the needs for an outside air temperature sensor, require no consideration for a setting place and make the highly reliable detection of the outside air temperature possible without being adversely affected by sunshine and the like while lightening a working load at the time of installation and reducing cost. CONSTITUTION:A heat pump type freezing cycle is formed by connecting a capability variable compressor, a four-way valve, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger to one another. Further, an inverter circuit 41 for supplying a drive electric power to the compressor 1 is provided, and an output frequency of the inverter circuit 41 is controlled according to an air conditioning load. An outdoor unit A has a heat exchanger temperature sensor 11 adapted to detect a temperature of the outdoor heat exchanger, and the temperature Te detected by the heat exchanger temperature sensor 11 at the time of starting operation is used as it is as an outside air temperature To during a predetermined period of time t1 from the start of operation. After a predetermined period of time t1 elapses from the start of operation, the temperature Te detected by the heat exchanger temperature sensor 11 is corrected in accordance with an output frequency of the inverter circuit to estimate the outside air temperature To.
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