| 摘要 |
According to the present invention: a combustible refrigerant has a greater density under atmospheric pressure than air; an indoor unit has a blower fan, a suction port that draws in air from an indoor space, and a discharge port that is provided above the suction port and discharges the air drawn in from the suction port into the indoor space; the discharge port is formed on the front surface or side surface of a housing of the indoor unit; a control unit operates the blower fan when leakage of the refrigerant is detected; and when the amount of refrigerant enclosed in a refrigerating cycle is defined as M [kg], the refrigerant combustion lower limit concentration is defined as LFL [kg/m3], the floor area of the indoor space is defined as A [m2], and the height of the discharge port from the floor surface of the indoor space is defined as Ho [m], the enclosure amount M, combustion lower limit concentration LFL, floor area A, and height Ho satisfy the relationship M < LFL×A×Ho. |
