| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost by realizing saving of wiring. SOLUTION: In this air conditioning system 10, a central monitor 18 can control two or more exterior units 14, 15, 16 of an air conditioner. A relay device 17 for changing the communication form is disposed between the central monitor and two or more exterior units, and the relay device is provided with two or more input ports 23, 24, 25 corresponding to two or more exterior units and with a change-over switch 26 for switching between the effectiveness of a single input port and effectiveness of all input ports. When the central monitor collectively controls two or more exterior units, the change-over switch is operated to make only the single input port effective, thereby transmitting the same control signal to two or more exterior units through the effective input port 23. COPYRIGHT: (C)2004,JPO
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