| 摘要 |
PURPOSE:To effect dust removal and deodorization before the degree of environmental pollution becomes high by bringing operation capacity to maximum levels by means of a control means regardless of output conditions of pollution, when levels of pollution have become higher than predetermined ones. CONSTITUTION:A sensing means 47 to detect pollution of indoor air is provided and automatic operating functions including a plurality of fan operation starting levels are provided so that signals from the means 47 are received and operation of a fan is started when said signals reach a predetermined level. And a control means brings operation capacity to maximum levels when levels of pollution become higher than predetermined levels regardless of output conditions of pollution. For example, when a switch 25 is depressed once again, Q-output of a counter 67 becomes H-level to turn on a switch SW2. When output voltage of the means 47 increases, a comparator 61 makes the output H-level so that a transistor Tr6 is turned on and TRIAC Q6 is turned on, so that operation is started rapidly at a high operation load regardless of concentration of pollu tion. |
