| 摘要 |
PURPOSE:To prevent the temperature of the apparatus from increasing and the combustion thereof from degrading by providing a temperature sensor in a hot air flow route, activating warming means when a temperature extraordinary rise is detected, and increasing the air flow quantity of a convection blower or lowering the quantity of combustion. CONSTITUTION:When dusts and dirts adhere to a fan guard 13 and a convection blower 10 during a space heating mode, the quantity of an air flow of the convection blower 13 reduces, and the temperature of a duct gradually rises up. Finally, a temperature sensor 14, mounted on the wall surface of the duct 11, is activated and its contact is opened. Then, a relay 21 operates and power is supplied to a warning lamp 15, and the lamp 15 is lit. Further, the convection blower 10 is changed from a normal tap 10a to a strong tap 10b, and its rotational speed becomes higher and the quantity of blast increases. Accordingly, clogging of heat in a combustion cylinder 8 and the duct 11 can be reduced, and the extraordinary rise in the temperature of the main apparatus body can be prevented. Furthermore, secondary air to be burnt in a burner 2 is supplemented through an air hole 9a, and excellent combustion condition is obtained. |
