| 摘要 |
PURPOSE:To reduce creation of noises and to perform a control of a comfortable room temperature, by a method wherein, in a combustion device varying in a combustion volume with a quantity of the air supplied, the number of revolutions of a blower can be controlled in 3 steps according to a difference between a detected value of a room temperature and a set value. CONSTITUTION:With a lever 4 for elevating a wick forcibly lowered, an operation switch turns ON to energize an igniting device 25, a wick 3 exposed to the outside through operation of the lever 4 is fired to start combustion. Simultaneously, a blast motor 17a is also energized, the air is fed by the rotation of a blast fan 17 and blown off downward along a suction guide 20. In which case, combustion gas from a burner is sucked to produce the hot air which is blown off through an outlet 24. In which case, a room temperature is detected by a thermistor 26, and the output thereof is fed to a control circuit. The different reference voltages from each other of the control circuit are compared with a set value by two comparators for inputting the reference voltages to an inversion input terminal, and based on the comparing results, the number of revolutions of the motor 17a is controlled in 3 steps. |
