| 摘要 |
When a prior-art transmission scheme is to be applied to an airconditioning equipment already installed in a building or a house, refrigerant pipes serving as communication media and an in-room unit as well as an out-room unit need to be insulated, so that steel pipes near both the ends of each refrigerant pipe have been inevitably replaced with electrical insulation devices. (Means for Resolution) An airconditioning equipment having an in-room unit 2 connected to one end of refrigerant pipes 3, 4 , and an out-room unit 1 connected to the other end of the refrigerant pipes 3, 4 , is characterized by comprising signal coupling portions 7 which are respectively disposed at both the end parts of the refrigerant pipes 3, 4 , each of which couples an AC control signal to the refrigerant pipes 3, 4 , and each of which exhibits a predetermined impedance with respect to an AC electric signal. Owing to such a configuration, the present invention brings forth the advantages that the electrical insulation devices as in the prior art are dispensed with, and that the signal transmissions between the in-room unit 2 and the out-room unit 1 can be performed by the simple apparatus configuration.
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