To make it unnecessary to add refrigerant in quantity even in the case where long piping is used for the connection to the multiroom type air conditioner and achieve realization of room-temperature control under an appropriate degree of superheat, an appropriate degree of supercooling, and an appropriate pressure.
In the connection between an outdoor apparatus 6 and three indoor apparatuses 7A,..., for the mutual connection between their liquid lines a liquid side conduit 12C and a capillary tube 14 are connected from the side of their expansion valves 4A, 4B, 4C and their gas lines are mutually connected by gas side conduits 11A,.... During operation for cooling the amount of control by respective room-temperature controllers and the amount of control by respective first degree of superheat controllers are so switched as to control the respective openings of the expansion valves 4A,.... During operation for heating the amount of control by the respective room-temperature controllers and the amount of control by respective degree of supercooling controllers 28A,.... are so switched as to control the respective openings of the expansion valves 4A; in accordance with a membership value decided by fuzzy operation to which the output of a pressure detector 13 is inputted the amount of control by a pressure controller and the amount of control by a total capacity controller, both control for deciding the number of revolutions of the compressor in a manner of bringing the respective room temperatures to the set values, are shifted to control the number of revolutions of the compressor 1.
OZEKI MASATAKA
MATSUO MITSUHARU
FUNAKURA SHOZO
OKAZA NORIHO
