| 摘要 |
PURPOSE:To provide an instantaneous hot-water supply equipment with a bathtub capable of transmitting necessary display signal for displaying the state of an equipment body side to an indicator of a remote control box side via two signal lines. CONSTITUTION:As a diaplay signal transmitted from an equipment body A side to a remote control box B side is used a signal VO having different DC voltages at normal operation time and produced by adding two types of signals VF, VS of the same voltage pulse shape at flame extinguishing time, and the signal VO is transmitted through a pair of signal lines SL to a remote control box B. Since this signal is discriminated at the box side to display correspondingly, 9 types of states can be transmitted only by a pair of signal lines. Thus, the wirings of the signal lines are not complicated, but the state of the equipment body side can be reliably displayed at the box side, the operation can be facilitated, and the reliability can be enhanced. |
