| 摘要 |
PURPOSE:To automate changeover by forming a changeover mechanism so that the suction air is changed over to indoor air or outdoor air in response to temperature diffeence between indoor air and outdoor air and the operation of an air-cooling or heating device. CONSTITUTION:Outdoor temperature and indoor temperature are compared by means of a comparator 3 by signals from an outdoor temperature sensor 1 and an indoor temperature sensor 2, and the output and the output of a cooling and heatig discriminator 4 discriminating the state of air cooling or the state of air heating are inputted to a logical processing circuit 5. An actuator 8 is not driven when an automatic-manual changeover switch 6 is turned to the manual side, and the actuator 8 is driven by means of a control circuit 7 in response to the output of the logical processing cicuit 5 when the switch is turned to the automatic side. That is, suction air is changed over to outdoor air when the interior of a room is under the state of air cooling and outdoor temperature is lower than indoor temperature, and suction air is inversely changed over when the interior of the room is under the state of air heating. |
