| 摘要 |
PURPOSE:To realize a maintenance-free state of a heater unit by a method wherein an odor component adsorbed on the surface of a heater is reproduced by thermal decomposition caused by periodical forced heating by an operation of the heater unit having a deodorizing function. CONSTITUTION:When an operation of a blower is started, a cumulative time (ta) of the operation is measured by an operation cumulative time measuring means 9 and stored in an operation cumulative time storage means 10. Meanwhile, an odor adsorption amount correction factor cA is changed by an odor adsorption amount correction factor changing means 14 in accordance with the number (n) of operating revolutions of a blower. The aforesaid cumulative time (ta) of the operation and the odor adsorption amount correction factor alpha are subjected to calculation of ts=taXalpha by a correcting operation cumulative time calculating meaqns 15 and the calculated value and a set cumulative time t1 of the operation from a set operation cumulative time storage means I11 are compared by an operation cumulative time comparing means 117 and outputted to a heating part operation control means 21. On the other hand, the passage from the start of the operation and a set time t2 are compared by an operation passage time comparing means II20, and when the result of comparison becomes equal to or larger than the set time t2, it is outputted to the aforesaid heating part operation control means 21. By this heating part operation control means 21, an on-off control of an electric circuit of a heating part is conducted. |
