DC motor for recirculation damper
| DC motor for recirculation damper |
The recirculation damper is controlled by a stepping motor. The damper has only two positions. When the motor has turned the damper to one of the end positions, the current through the motor winding is limited by two PTC resistors, built into the motor. PTC is short for Positive Thermal Coefficient and means that the resistance increases with temperature (opposite to NTC). In addition the ACC control module will close the output after a certain time. This, however, is not done on cars with manual control panel but the motor is not at risk for damage due to the inner limitation of current. The ACC control module selects recirculation when the cooling effect is not sufficient in the fresh air position or when the car speed is 10 km/h or lower and the required blended-air temperature is 0 ° C. Recirculation can also be selected manually, although not in the manual defrost position, and a symbol indicating the selection is shown on the ACC panel display.
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