Refrigeration cycle apparatus

A refrigeration cycle apparatus comprising:

• a refrigerant circuit configured to circulate refrigerant to a compressor, a condenser, an expansion valve, and an evaporator, the compressor being connected to the condenser by a first extension pipe, the expansion valve being connected to the evaporator by a second extension pipe;
• a detection unit configured to detect an operating state amount of the refrigerant circuit;
• and
• a controller configured to execute a detection operation of detecting refrigerant leakage based on the operating state amount detected by the detection unit,
• wherein the controller controls a refrigerant state at an outlet of the condenser to become a saturated liquid state, and controls a quality of the refrigerant at an outlet of the second extension pipe to be in a range from 0.1 to 0.7 in the detection operation,
• wherein the refrigerant circuit includes the compressor, the expansion valve, an outdoor heat exchanger serving as the condenser or the evaporator, and a plurality of indoor heat exchangers serving as the evaporator or the condenser,
• wherein the compressor is connected to each of the plurality of indoor heat exchangers by the first extension pipe and the expansion valve is connected to the outdoor heat exchanger by the second extension pipe,
• wherein the controller causes all the plurality of indoor heat exchangers to serve as the evaporators and controls a frequency of the compressor to be a first compressor frequency so that an evaporating pressure of the refrigerant circuit becomes equal to or lower than 1.0 MPa in the detection operation, and
• wherein the first compressor frequency is half of a rated compressor frequency.