| 摘要 |
PURPOSE:To adjust an air-fuel ratio at one adapted to a gas used without igniting a gas burner by installing a load setter having specific constitution and an electronic controller. CONSTITUTION:A first terminal 71 for a load setter 70 is connected to an intermediate terminal 73 in order to adjust the opening of a proportional solenoid valve 30 under a minimum load state and the number of revolution of a motor fan 40. The opening of the proportional solenoid valve 30 and the number of revolution of the motor fan 40 are brought to a minimum state under the state, but an on-off solenoid valve 25 is closed and a gas burner 10 is not ignited. Applied currents to the proportional solenoid valve 30 and the number of revolution of the motor fan 40 are observed, a minimum-opening regulator 60 and a minimum-revolution regulator 64 are regulated manually, and each value is brought to specified minimum values corresponding to the gas kinds. To adjust opening under a maximum load state and the number of revolution, a second terminal 72 is connected to the intermediate terminal 73, and a maximum-opening regulator 62 and a maximum-revolution regulator 66 are regulated manually in the same manner as mentioned above. |
