| 摘要 |
PURPOSE:To inhibit an insufficient quantity of air due to disturbance and hence improve the combustibility of a burner by detecting a quantity level of combustion and a blower drive state, comparing the detected data with their respective setting level and adjusting the voltage of a blower based on the comparison data. CONSTITUTION:Decision is made as to whether or not a specified combustion quantity setting level decided based on the temperature of hot water and the quantity of water set by a comparison circuit 10 is applied to a proportional control valve 5. When the data is identical to the setting level, a comparison circuit 9 compares a pressure level of a forced air draft duct 3 with a specified air quantity level. When the load is normal, the pressure level of the forced air draft duct 3 is identical to the air quantity setting level. When there are load fluctuations, the data is judged as unconformable. The blower application voltage which is predetermined under each condition is set and applied to a blower 1. When the data fails to conform to the combustion quantity setting level, the blower application voltage which is predetermined to let the air quantity to conform a gas quantity of a proportional control valve 5, is set and applied to the blower 1. The aforesaid construction makes it possible to obtain a setting air quantity which is immune to disturbance. |
