US Patent 9739513 Air conditioning apparatus

An air-conditioning apparatus detects refrigerant leak with high-accuracy even in a state in which an excessive liquid refrigerant is stored in an accumulator. The air-conditioning apparatus determines that leakage of refrigerant has occurred from a refrigerant circuit in an operating state in which an excessive liquid refrigerant is stored in an accumulator, after a part of the excessive liquid refrigerant stored in the accumulator is moved and stored into a condenser, with the excessive liquid refrigerant remaining in the accumulator as a reference amount, when the excessive liquid refrigerant is less than the reference amount.