| 摘要 |
PURPOSE:To prevent an actual output from being reduced to a value lower than a specified output by providing a controller to stagedly increase the number of revolutions of a blast fan when the actual output of a burner is higher than a specified output. CONSTITUTION:A water boiler is controlled by a controller 10, and detected signal s from a water quantity sensor 3, an inflow water thermistor 4, and a feed hot water thermistor 5 are inputted to a computing control part 13 of the controller 10. The computing control part 13 is provided with a computing function to determine the actual output of a burner 6 and a comparing and judging function to compare an actual output with a stored specified output. The computing control part 13 compares the actual output with the specified output, and decides whether or not the burner 6 is brought into an over output state during full opening of a proportional valve 8. When the actual output is below the specified output, a normal running state is continued. When the actual output exceeds the specified output, a number of revolutions of fan control part 12 stagedly shifts the number of revolutions of a fan to increase it. This constitution prevents the actual output from being reduced to a value lower than the specified output at a transient period. |
