| 摘要 |
PROBLEM TO BE SOLVED: To automatically judge that an air filter is exchanged even if a special operation is not executed in the case when the air filter is exchanged and to accurately judge a suitable exchange time of the exchange air filter. SOLUTION: A tact switch 96 is embedded at the positioning part 39 abutting to the back surface of the air filter 36. In the tact switch 96, a projecting actuator 97 is protruded upward from the positioning part 39. When the air filter 36 is charged at a filter charging part 35, an actuator 37 is pressed downward by the back surface of the air filter 36. In this way, the tact switch 96 is actuated and a contact signal is output to a microcomputer being a control means. |
