Air-conditioning apparatus utilizing compressor preheating

摘要

An air-conditioning apparatus includes an outdoor air temperature sensor detecting an outdoor temperature; a compressor temperature sensor detecting a temperature of an outer wall of a compressor; a liquid-level and concentration detection sensor detecting a liquid surface level in the compressor and a concentration of a lubricant oil in a liquid in the compressor; an electric heater heating the compressor; and a controller that carries out preheating to the compressor by driving the electric heater when a detection value of the outdoor air temperature sensor is higher than or equal to a detection value of the compressor temperature sensor and, further, when the liquid surface level detected by the liquid-level and concentration detection sensor is higher than or equal to a predetermined level and the concentration of the lubricant oil in the liquid is lower than a preset minimum required concentration.

主权项

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.