| 摘要 |
PURPOSE:To keep an air-fuel ratio in a set value by a method wherein correction control is effected so that the output of a combustion sensor becomes a set value in accordance with the setting condition of the supplying amount of fuel which is controlled by a proportional control valve or the supplying amount of combustion air. CONSTITUTION:A fan control circuit 61 amplifies proportionally the output signal of a water temperature sensor 53 and a reference value obtained from a volume 54 for regulating temperature and controls the amount of conduction for a fan 33 to regulate the temperature of hot-water obtained from a gas water heater 1. A rotating speed detecting circuit 52 detects the rotating speed of the fan 33 to detect the supplying amount of combustion air. A proportional valve control circuit 63 controls the opening ratio of a proportional control valve 45 in accordance with the output of the rotating speed detecting circuit 62 and the output of a thermocouple 52 to control the supplying amount of gas. The opening degree setting circuit 63a of the proportional valve control circuit 63 sets the opening of the proportional valve 45 in accordance with the output of the rotating speed detecting circuit 62 while an opening degree correcting circuit 63b corrects the output of the opening degree setting circuit 63a so that the output of the thermocouple 52 becomes a value set in accordance with the output of the rotating speed detecting circuit 62.
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