| 摘要 |
PURPOSE:To obtain a hot water outflow temperature in conformity precisely with a set temperature value, by detecting the outputs of a temperature setting circuit and a hot water temperature detecting circuit by one of comparators, and detecting and controlling the outputs of two operating circuits and an output detecting circuit by the other comparator. CONSTITUTION:The output of the hot water detecting circuit 6 corresponding to the output of a detector 1 and the output of the temperature setting circuit 5 are inputted into the first comparator 8, and in accordance with the output thereof the first operating circuit 7 controls the first proportional control valve 4 to regulate the amount of burning of a main burner 3. Further the output of the output detecting circuit 12 for detecting the output of said first operating circuit 7 and the output from the first comparator 8 are inputted into the second comparator 13 and are compared with a maximum output setting circuit to be inputted into the second operating circuit 10, and when the input valve into the first operating circuit 7 reaches an output corresponding to the maximum output or above, a second proportional control valve 11 on the inflow side of a heat exchanger 2 is controlled by the second operating circuit 10 to control the amount of water to be delivered. |
