Distribution actuator

Distribution actuator

The direction of the air flow is suitably controlled by the ECU by means of the distribution actuator. This activates three shutters that send the air flow either to the lower vents, front vents or towards the windscreen. A voltage powered motor controls the rotary movement of a drive pin that acts directly on the distribution shutter:

0V = clockwise rotation

2.5 V = stop motor

5V = anti-clockwise rotation

A potentiometer (10 kOhm) reads the actual position and acts as “feedback” towards the ECU, checking the complete run between the extreme positions (maximum run 120°).

Mixing actuator

The air temperature is suitably controlled by the ECU by means of a hot and cold air mixing actuator. This activates the shutter that conveys or stops the air flow to the heating radiator. A voltage powered motor controls the rotary movement of a drive pin that acts directly on the mixing shutter:

0V = clockwise rotation

2.5 V = stop motor

5V = anti-clockwise rotation

A potentiometer (10 kOhm) reads the actual position and acts as “feedback” towards the ECU, checking the complete run between the extreme positions (maximum run 120°).

Passenger compartment air temperature sensor

This is a NTC sensor (R = 10 kOhm a 25°C) The sensor is “ventilated”, i.e. it includes a small, constantly powered fan (activated by a brushless motor) to ensure the temperature reading is not effected by stagnant - therefore hotter - air inside the dashboard.

External air temperature sensor

This is a NTC sensor (R = 10 kOhm a 25°C).