| 摘要 |
PURPOSE:To make it simple to control the maximum and minimum air volumes and prevent lift combustion and back combustion by connecting to a microcomputer two variable resistances which corrects the maximum and minimum rotational speeds of a blower. CONSTITUTION:A proportional burner is provided with an 8-bit microcomputer 14 (hereinafter called micom) which controls the rotational speed of a blower, a variable resistance 15 which corrects the maximum rotational speed of the blower, and a variable resistance 16 which corrects the minimum rotational speed of the blower. A rotational speed of the motor 18 is obtained by the micom 14 in accordance with an input value of a hot water supply thermostat 4, and maximum and minimum rotational speeds are corrected by regulating a variable resistances 15 and 16, and at the same time the rotational speed can be kept from becoming larger than the required maximum rotational speed or smaller than the minimum rotational speed. With this arrangement, required maximum and minimum air volumes can be controlled simply and lift combustion and back combustion can be prevented. |
