To provide a refrigeration cycle device that can suppress a disproportionation reaction of a working medium without impairing comfort for users.

A refrigeration cycle device 1 according to the present disclosure is a refrigeration cycle device that includes an outdoor unit 30 including a compressor 31, and that includes a plurality of indoor units 10 each including an expansion valve 15, wherein a working medium containing an ethylene-based fluoroolefin is used as refrigerant, the refrigeration cycle device includes a control unit 70, and when indoor units 10 of the plurality of indoor units 10 are in an operating state, and when a discharge temperature T from the compressor 31 is a predetermined temperature T1 or higher, the control unit 70 opens the expansion valve 15 of an indoor unit 10 of indoor units 10 in an operation stop state.

An air conditioning device according to one embodiment includes an outdoor unit, a plurality of indoor units, a plurality of switching units, and a control unit. If an outdoor heat exchanger functions as an evaporator and, among the plurality of indoor units, some are in cooling operation and some are in heating operation, the control unit adjusts the opening degree of an indoor expansion valve of an indoor unit during a cooling operation, such adjustment being in accordance with the outdoor temperature and the indoor temperature that was detected by an indoor temperature detection unit of an indoor unit during a heating operation.

An air conditioner may include a controller; a compressor; an outdoor heat exchanger; a plurality of indoor heat exchangers; a switching valve that selectively guides a refrigerant discharged from the compressor to the outdoor heat exchanger or the plurality of indoor heat exchangers; high pressure pipes that connect the switching valve and the plurality of indoor heat exchangers; high pressure valves installed in the high pressure pipes; low pressure pipes that connect an inlet of the compressor and the high pressure pipes. low pressure valves installed in the low pressure pipes; indoor pipes, which are opposite to the high pressure pipes with respect to the plurality of indoor heat exchangers and connected to the plurality of indoor heat exchangers; indoor expansion valves installed in the indoor pipes; a liquid pipe that connects the outdoor heat exchanger and the indoor pipes; and an outdoor expansion valve installed in the liquid pipe.