For both heating and cooling air conditioner

摘要

PURPOSE:To improve starting characteristics in a heating operation, and to facilitate the change-over from a heating cycle to a cooling cycle by a method wherein a slide valve allows an indoor side heat exchanger and the suction side of a compressor to communicate with each other, whereby an outdoor side heat exchanger and the outlet side of the compressor communicate with each other via a high-pressure chamber. CONSTITUTION:When a slide valve 27 allows an outdoor side heat exchanger 10 and the suction side of a compressor 4 to communicate with each other in a state that a piston 12 is moved by a spring 13 in the direction of a high-pressure chamber R1, an indoor side heat exchanger 9 and the outlet side of the compressor 4 communicate with each other via the high-pressure chamber R1. In this instance, a pressure changing chamber R2 and the suction side of the compressor 4 are disconnected from each other by a pilot solenoid valve 15 and, when the pilot solenoid valve 15 is opened at the time of supplying power thereto and the pressure changing chamber R2 communicates with the suction side of the compressor, the slide valve 27 allows the indoor side heat exchanger 9 and the suction side of the compressor to communicate with each other in a state that the piston 12 is moved against the spring 13 by pressure differences. Thereby, the outdoor side heat exchanger and the outlet side of the compressor communicate with each other via the high pressure chamber. Accordingly, starting characteristics in a heating operation can be improved, and the change-over from a heating cycle to a cooling cycle can be done in a relatively short period of time.