Patent ID: 9528733
Filing Date: 2016-12-27
CPC Classification: F25B

Claim Text:
1. An air-conditioning apparatus, comprising: a refrigerant circuit connecting a compressor, a heat source side heat exchanger, an expansion valve, and a use side heat exchanger in order with a refrigerant piping; a compressor heater for heating the compressor when the compressor is not in operation; a compressor temperature sensor for detecting a compressor temperature; a refrigerant temperature detection sensor for detecting a refrigerant temperature in the compressor; and a controller configured to: estimate an amount of liquid refrigerant in the compressor by integrating the temperature difference between the compressor temperature and the refrigerant temperature during a period in which the compressor temperature becomes lower than the refrigerant temperature, and control the heating operation, which is carried out by the compressor heater, on the basis of the estimated liquid refrigerant amount when the compressor is not in operation.