PURPOSE:To improve blow-out temperature characteristics at the initial stage of room heating by providing a three-way valve which, at the initial stage of the room heating operation, passes a gas coolant through a piping without a heat accumulating member and, at the stage at which temperature is raised, controls to allow the coolant to flow through a piping section which is provided with a heat accumulating member. CONSTITUTION:A three-way valve 13 is connected to a piping section 11 in series, and a first piping 14 is provided with a heat accumulating member 10. At the initial stage of room heating operation, if the temperature of a heat exchanger 8 on the indoor side is lower than a specified temperature, a gas coolant of a high temperature and high pressure that is discharged out of a compressor 1 flows through a second piping 15 without a heat accumulating material as shown in the arrow mark in a solid line by means of a three-way valve 13 that is controlled by a temperature detection control device 16 mounted at a section of the heat exchanger 8 on the indoor side, of which temp. rises to a specified temperature in a short time. When it reaches a specified temperature, the temperature detection control device 16 operates, and the three-way valve 13 is changed over as shown by a broken line so that the coolant is made to flow in a first piping 14, and the gas coolant of a high temperature, high pressure heats the heat accumulating member 10, and heat is accumulated in it. With this constitution it is possible to improve the characteristics at the rise of the blow-out temperature at the initial stage of room heating operation.
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