| 摘要 |
PURPOSE:To prevent the increase of gas concentration without reducing air- conditioning performance more than necessary by providing a control means wherein gas concentration in a car room is detected and an open air introducing means is operated when given gas concentration exceeds a threshold. CONSTITUTION:An air-conditioning device 2 is provided with a gas sensor 72 to detect given gas concentration in a car room. When gas concentration obtained thereby exceeds a given threshold, through operation of a control device 4, an internal introduction mode is switched to an open air introduction mode. Namely, an internal air introduction port 26 of an open air introduction means 30 is closed and an open air introduction port 28 is opened to introduce the open air, and gas concentration is reduced. When gas concentration is not reduced to a value lower than a given threshold for a reference time after switch to the open air introduction mode is completed, an alarm buzzer 74 is operated through the working of a control device 4. When gas concentration is reduced to a value lower than a given release threshold, the open air introduction mode is switched to the internal air introduction mode again to prevent reduction of air-conditioning performance more than necessary. |
