AIR CONDITIONER

To provide an air conditioner that does not impair reliability of a compressor even when a refrigerant is insufficient.SOLUTION: An air conditioner 1 includes: refrigerant circuits 10 and 13 connected by a refrigerant pipe so that a refrigerant flows in order of a compressor 21, an indoor heat exchanger 31, an upstream side expansion valve 24, an intermediate pressure receiver 81, a downstream side expansion valve 28, and an outdoor heat exchanger 23 during heating operation; and control means 200 for controlling the upstream side expansion valve 24 and the downstream side expansion valve 28. The control means 200 includes a refrigerant insufficiency determination unit 210 for determining whether or not the refrigerant is insufficient in the refrigerant circuits 10 and 13, and a liquid storage determination unit for determining whether or not the liquid refrigerant is stored in the intermediate pressure receiver 81, and if the refrigerant is determined to be insufficient, and the liquid refrigerant is determined not to be stored in the intermediate pressure receiver 81, increases an opening of the upstream side expansion valve 24 until a suction superheat degree of the compressor 21 reaches a target value.SELECTED DRAWING: Figure 1 【課題】冷媒が不足しても圧縮機の信頼性を損なわない空気調和機を提供する。【解決手段】空気調和機１は、冷媒が、暖房運転時に、圧縮機２１、室内熱交換器３１、上流側膨張弁２４、中圧レシーバ８１、下流側膨張弁２８、室外熱交換器２３の順に流れるように冷媒配管で接続された冷媒回路１０，１３と、上流側膨張弁２４及び下流側膨張弁２８を制御する制御手段２００を備え、制御手段２００は、冷媒回路１０，１３が冷媒不足か否かを判定する冷媒不足判定部２１０と、中圧レシーバ８１内に液冷媒が溜まっているか否かを判定する液貯留判定部と、を有し、冷媒不足と判定され、かつ、中圧レシーバ８１内に液冷媒が溜まっていないと判定されると、圧縮機２１の吸入過熱度が目標値に到達するまで上流側膨張弁２４の開度を大きくする。【選択図】図１