Air conditioner

An air conditioner comprising a compressor, a first heat-source-side heat exchanger, a second heat-source-side heat exchanger, a use-side heat exchanger, an ejector that raises a pressure of refrigerant by using energy for refrigerant decompression and expansion, an expansion valve, and a switching valve, wherein

• the switching valve switches between a refrigerant flow in a first operation and a refrigerant flow in a second operation,
• in the first operation, the refrigerant compressed by the compressor radiates heat in the use-side heat exchanger and is decompressed and expanded by the ejector while the refrigerant evaporated in the first heat-source-side heat exchanger is raised in pressure by the ejector, and
• in the second operation, the refrigerant compressed by the compressor radiates heat in the first heat-source-side heat exchanger and is decompressed and expanded by the expansion valve before being evaporated in the use-side heat exchanger while the refrigerant does not flow through the ejector,
• the switching valve is configured such that in the first operation, the refrigerant compressed by the compressor radiates heat in the use-side heat exchanger and is decompressed and expanded by the ejector while the refrigerant decompressed and expanded by the expansion valve and then evaporated in the first heat-source-side heat exchanger is raised in pressure by the ejector and the refrigerant raised in pressure by the ejector is further evaporated in the second heat-source-side heat exchanger, wherein the refrigerant decompressed and expanded by the expansion valve flows sequentially through the first heat-source-side heat exchanger, the ejector and the second heat-source-side heat exchanger, and
• the switching valve is configured such that in the second operation, the refrigerant compressed by the compressor radiates heat in the first heat-source-side heat exchanger and the second heat-source-side heat exchanger and is decompressed and expanded by the expansion valve before being evaporated in the use-side heat exchanger while the refrigerant does not flow through the ejector.