| 摘要 |
PURPOSE:To improve a safety and operability by a method wherein some regular AC signals generated by a control circuit arranged in equipment is detected by a sensor circuit arranged at a remote control box. CONSTITUTION:A combustion safety control circuit 4 is operated such that a voltage divided by a hot water thermistor TH and a resistor 7 and a voltage divided by a composite resistance made by a resistor 8 and a variable resistor 20, resistor 22 and resistor 23 arranged in a remote control circuit are compared to each other in a comparator 6 to get a heat requiring signal and at the same time an ignition operation is performed in accordance with a predetermined sequence under an operation switch 21 arranged in the remote control box and an operation instruction signal got by a transistor 17, resistor 18 and resistor 19 and at the same time a control signal produced by a control signal circuit 5 is transmitted in sequence to the remote control circuit through a transmittance line 9. Pins for shift transistor IC24 are connected to the base terminal of the transistor 17 under a transmittance of alternative pulses with a specified duty ratio to produce an operation instruction signal. |
