| 摘要 |
PURPOSE:To aim at simplifying a circuit structure as well as lowering its cost by composing a temperature setting means with a rheostat comprising a specific shorting area in making control of a motor for driving a mixed door based on respective output signals from a heat load detecting means and a temperature setting means. CONSTITUTION:Respective output signals from a heat load detecting means composed of the electric circuit comprising an inside air sensor Ti and an outside air sensor To, and a temperature setting rheostat VR are inputted into a control part 1. The rotational displacement of a motor 2 for driving a mixed door is controlled in response to each input signal by means of the control part 1. When the setting of the rheostat VR is in the proximity of both ends, a sliding element is put into the shorting area 4 of a sliding part and the output signals from the rheostat VR are made as source potential or earth potential. If this potential is inputted into an operational amplifier A, either one of the outputs becomes high and the other becomes low, and the motor 6 is displaced unconditionally to the maximum displacement. |
