| 摘要 |
An indoor-unit transmission/reception unit (15A) and an outdoor-unit transmission/reception unit (25A) are connected via a first signal line (SA), and an indoor-unit transmission/reception unit (15B) and an outdoor-unit transmission/reception unit (25B) are connected via a second signal line (SB). A first return switch (MR10A) is connected between a first power supply line (L1) and the first signal line (SA), and a second return switch (MR10B) is connected between the first power supply line (L1) and the second signal line (SB). A first end of a second switch (MR30) is connected to the first power supply line (L1), and a second end of the second switch (MR30) is connected to the cathodes of two diodes (27A, 27B). The anodes of the first and the second diodes (27A, 27B) are connected to the first and the second signal lines (SA, SB), respectively. A common end of the second switch (MR30) is connected to the first end or the second end thereof. An outdoor-power supply unit (22) is fed with electric power from the common end of the second switch (MR30) and the second power supply line (L2). |
