Air-conditioning apparatus

Abstract

An air-conditioning apparatus in which entry of a refrigerant into a living space is suppressed and measures against refrigerant leakage are taken is provided. An air-conditioning apparatusis provided with a heat source devicehaving a compressor that pressurizes a primary refrigerant, a four-way valvethat switches a circulation direction of the primary refrigerant, and a heat-source side heat exchangerconnected to the four-way valveand installed outside of a buildinghaving a plurality of floors or in a space leading to the outside, a relay unithaving an intermediate heat exchanger that is disposed in a space not to be air-conditioned different from the space to be air-conditioned on the installed floor separated from the heat source deviceby plural floors and exchanges heat between the primary refrigerant and a secondary refrigerant and a pumpthat conveys the secondary refrigerant, an indoor unithaving a use-side heat exchangerthat exchanges heat between the secondary refrigerant and air in the space to be air-conditioned, a vertical pipeline that connects the heat source deviceand the relay unitacross the plurality of floors, and a horizontal pipeline that connects the relay unitand the indoor unitto each other from outside a wall dividing the space to be air-conditioned to indoors and outdoors and in which the secondary refrigerant in a liquid phase flows through both of pipelines in sets of at least two pipelines.