| 摘要 |
An indoor unit 10 includes an indoor side transmitting and receiving section 15 which is connected to a signal line L 3 and employs a photocoupler, a relay MR 10 which is connected between a power line L 1 and a signal line L 3 and is put in a closed state in a standby state, and an indoor control section 12 which controls the relay MR 10 on the basis of an output of the indoor side transmitting and receiving section 15. An outdoor unit 20 includes an outdoor side transmitting and receiving section 25 which is connected to the signal line L 3 and employs a photocoupler, and a power circuit 23 supplied with a power from two power lines L 1 and L 2. Then, the indoor control section 12 of the indoor unit 10 does not bring the relay MR 10 into the closed state upon determining that the connection wiring lines which connect the indoor unit 10 with the outdoor unit are miswired on the basis of a reception output of the indoor side transmitting and receiving section 15 when operation starts from a standby state in which the supply of power of the outdoor unit 20 is stopped.
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