| 摘要 |
PURPOSE:To effectively inform a filter replacing period at a suitable timing by automatically starting integration of an operating time according to replacement of a filter even without operating a reset switch one by one. CONSTITUTION:A microswitch 9 detects mounting/dismounting of a filter, and a controller 19 integrates, when mounting of the filter is detected, the operation of a motor 3 thereafter. The controller 19 operates, when an integrated value of the operating time reaches a predetermined time for judging the life, a first light emitting diode 13. Thus, a filter replacing time can be effectively informed at a suitable timing. Further, the controller 19 counts the number of mountings of the filter, and operates a second light emitting diode 14 when the counted value reaches a predetermined value. Thus, the number of used filters can be known. |
