| 摘要 |
PURPOSE:To detect surely and easily the condition of a signal between an operating section and a driving section by a method wherein a signal wire, arranged between a control unit and the operating section or the driving section, is provided with a luminous indicating section, emitting light on receiving a signal current which flows through the signal wire. CONSTITUTION:Signal lines of a hot-water supply push button switch 16 and a water delivery push button switch 17 on an operation panel 15 are provided with luminous indicating sections 101, 102 while the signal wires of temperature sensors 8, 12 and level sensors 14H, 14I are provided with the luminous indicating sections 103, 104, 105, 106. Two pieces of signal wires, connecting a hot-water supply amount control section 20 and a solenoid valve 5, are provided with the luminous indicating sections 110, 111, the signal wire connecting a temperature control section 21 to a mixing valve 4 is provided with the luminous indicating section 112 and the signal wire, connecting a temperature monitoring section 22 to an indicating panel 30, is provided with the luminous indicating section 113. A luminous diode 119 and a resistor 120 are connected to each luminous indicating section 101-118 in series while they are connected in parallel with each signal wire. According to this method, respective luminous indicating sections 101-118 can detect the conditions of signals surely with the light emitting condition of the luminous diode 119.
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