| 摘要 |
PURPOSE:To improve the blast efficiency of a blast fan by providing a controller to control the number of revolutions of the blast fan based on an actual output when the actual output of a burner exceeds a specified output. CONSTITUTION:A water boiler is controlled by a controller 10, and a detected signals from a water quantity sensor 3, a 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 the actual output with the specified output, and judge 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 signal exceeds the specified output, the number of revolutions of the fan control part 12 is controlled based on the actual output. This constitution feeds an airflow higher than that in a normal running state and a proper airflow to a burner. |
