| 摘要 |
PROBLEM TO BE SOLVED: To prevent an abrupt stop of an air conditioner due to abnormal high pressure at heating operation. SOLUTION: When heating by sending a refrigerator R-134a evaporated by heating by an outdoor unit 10 installed on a roof or the like of a building to indoor units 20 installed at the respective floors, and when the refrigerator R-134a in the heat operating unit of the unit 1 is heated excessively and the pressure of the refrigerator gas R-134a measured by a pressure sensor 18B exceeds a prescribed value such as, for example 1.8 MPa, a controller 50 for opening an on/off valve 14 to rapidly lower the pressure to move the refrigerant liquid R-134a in the unit 11 to a receiver tank 12 is provided.
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