| 摘要 |
PURPOSE:To prevent mixing of exhaust air tinto supply air for the open air intake control device by a method wherein a damper is fully closed for a given period of time when the open air damper is opened almost to the full. CONSTITUTION:A controller 10 outputs a control signal 23 by receiving and processing the outputs of temperature sensors 6, 7 in synchronism with the output signal 21 of a reference pulse generator 18. The control signal 23 is compared with a reference voltage 20 in the controller 10 through voltage level. When the voltage of the control signal 23 does not exceed the reference voltage 20, the control of opening and closing of the dampers 3, 5 is effected as usual, however, when it exceeds the reference voltage in one pulse interval of the output signal 22 of a timer 19, the controller 10 outputs a control signal to forcibly close the dampers 3, 5 for the following time period (b). That is when the dampers 3, 5 have opened almost to the full depending on the atmospheric and circulating air temperature conditions, the dampers 3, 5 are forcibly and totally closed for a given period of time whereby mixing of discharged indoor air with the open air introduced into the room may be prevented. |
