AIR CONDITIONER

摘要

A technique in which, even if external power supplied to an indoor unit is shutoff, the indoor unit can perform appropriate control for other indoor units. An air conditioner of the invention has indoor units (1) controlled by an outdoor unit. An indoor unit (1) has a main control section (11) for centralizedly controlling operation of the indoor unit (1), a communication section (12) for communication with the outdoor unit, an external power detection section (13) for detecting that external power (EV) supplied to the indoor unit (1) is shut off, and a backup power source section (15) for outputting backup power source (VBAT) supplied to the communication section (12) when the external power source (EV) is shut off. In the indoor unit (1), when the external power detection section (13) detects that the external power (EV) is shut off, the communication section (12) informs the out door unit that the external power source (EV) is shut off.