| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that signal transmission/reception between an outdoor unit and one of indoor units is functioned as signal transmission/reception of the other indoor units when a power supply function for shifting from operation standby to normal operation is given to a signal line.SOLUTION: An indoor unit transmitting/receiving portion 15A and an outdoor unit transmitting/receiving portion 25A are connected by a signal line SA, and an indoor unit transmitting/receiving portion 15B and an outdoor unit transmitting/receiving portion 25B are connected by a signal line SB. A return switch MR10A is connected between a power source line L1 and the signal line SA, and a return switch MR10B is connected between the power source line L1 and the signal line SB. The power source line L1 is connected to a first end of the second switch MR30, and cathodes of diodes 27A, 27B are connected to a second end of the second switch MR30. Anodes of the diodes 27A, 27B are connected to the signal lines SA, SB respectively. A common end of the second switch MR30 is connected to its first end or second end. Electric power is supplied to an outdoor power supply portion 22 from the common end of the second switch MR30 and the power source line L2. |
