| 摘要 |
PURPOSE:To raise a temperature of hot water fed out by a method wherein an alarm circuit is connected to an output terminal of a safety thermo-circuit connected to a hot water temperature control thermo-circuit. CONSTITUTION:A hot water control thermo-circuit consists of a hot water temperature sensing thermistor 2, resistors 3-5, and a differential amplifier 6, and a safety thermo-circuit consists of a resistors 7, 8 and a differential amplifier 9 while an alarm circuit 13 is connected to the safety thermo-circuit. When the hot water temperature is low at first, (+) potential at the amplifier 6 becomes higher than (-) potential thereof, resulting in initiating a combustion of the boiler and no signal is fed to the circuit 13. Then, when the hot water temperature becomes a desired predetermined value, the input for the amplifier 6 is reversed so as to terminate the combustion of the boiler and at the same time, a feeding of the signal to the amplifier 9 is terminated and no signal is fed to the circuit 13. When the hot water temperature is raised due to some trouble, the input to the amplifier 9 is reversed, a signal is fed to the circuit 13, and even in case of an abnormal conbustion, the circuit 13 is operated with a signal from the flame detecting circuit 12. |
