MULTIPLE TYPE AIR CONDITIONER, AND SOLENOID VALVE UNIT USED FOR REFRIGERANT LEAKAGE-PREVENTION MEASURE OF INDOOR EXPANSION VALVE

摘要

PROBLEM TO BE SOLVED: To prevent a liquid refrigerant from leaking into a heat exchanger of an indoor unit in stopping even if a shutoff property of the indoor expansion valve is degraded while operating an air conditioner in a cooling mode. SOLUTION: A solenoid valve 18 is arranged on an outdoor unit 1 side relative to an indoor expansion valve 13, the solenoid valve 18 is totally closed based on a stop instruction of each indoor unit 2 or a total closure control signal of the indoor expansion valve, and thereby the liquid refrigerant is prevented from leaking into the indoor heat exchanger 12 of the indoor unit 2 in stopping even if the shutoff property of the indoor expansion valve 13 is degraded. A check valve bypassing the solenoid valve is arranged to prevent the refrigerant and refrigerator oil from being accumulated in the indoor heat exchanger 12 even when the solenoid valve 18 is totally closed when a stop instruction of each indoor unit 2 is input in a heating mode, and a passage returning the refrigerant and the refrigerator oil to the outdoor unit is secured. COPYRIGHT: (C)2009,JPO&INPIT