| 摘要 |
PURPOSE:To skillfully use contamination degree display functions by suspending electric power supply except that of indoor contamination degree display functions depending on the number of depressions of a switch for suspension of operation and by providing a control means to cut off power supply to all circuits including said display functions. CONSTITUTION:By using detection signals from a detection means 47 to detect contamination of indoor air, loads of operation of a fan and degree of contamination of indoor air are displayed and switched over. And, in a control means 64, power supply except for an indoor contamination degree display function 63 is cut off depending on number of depression of a switch 25 for stopping operation, or power supply to all circuits including a contamination degree display function 63 is cut off. Consequently, by actuating repeatedly by means of one switch, only display is turned on and stoppage of all functions can be selected, so that contamination display functions can be skillfully used. |
