Patent ID: 8966915
Filing Date: 2015-03-03
Classification: F25B

Abstract:
1. An air-conditioning apparatus, comprising: an outdoor air temperature detection device detecting an outdoor temperature; a compressor-outer-wall temperature detection device detecting a temperature of a compressor outer-wall; a liquid-level and concentration detection device detecting a liquid surface level in a compressor and a concentration of lubricant oil in a liquid in the compressor; a heating device heating the compressor; and a controller that carries out preheating to the compressor by driving the heating device when a condition exists wherein a detection value of the outdoor air temperature detection device is higher than or equal to a detection value of the compressor-outer-wall temperature detection device, the liquid surface level detected by the liquid-level and concentration detection device is higher than or equal to a predetermined level, and the detected concentration of the lubricant oil in the liquid in the compressor is lower than a preset minimum required concentration.