| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve such a problem of an air conditioner using a shielded line for the communication line between an indoor unit and an outdoor unit that a trouble occurs in communication between the indoor unit and the outdoor unit and the destruction of a communication circuit happens due to an eddy current flowing to a shielding ground of the shielded line. <P>SOLUTION: The communication circuit comprises: the outdoor unit 1 that consists of an outdoor communication means 12, an outdoor communication protecting means 14, and an outdoor shielding current sensing means 15; an indoor communication means 22; an indoor communication protecting means 24; and an indoor shielding current sensing means 25. The outdoor shielding current sensing means 15 and indoor shielding current sensing means 25 detect the ground wire current in the shielded line, and operates the indoor communication protecting means 14 and outdoor communication protecting means 25 (turn off a relay), thereby preventing the destruction of the communication circuit. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
