Airflow Mode Door Actuator

The airflow mode door actuator uses a cam and lever assembly to position the airflow mode doors on command from the EMTC module. The mode door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the EMTC module to monitor the position of the airflow mode doors. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal return circuit is connected to a contact wiper, which is driven along the variable resistor by the actuator shaft. The signal returned to the EMTC module from the contact wiper indicates the position of the airflow mode doors.