With the wireless sun sensor 9478, the sun sensitivity is changed with the small potentiometer.
If you turn the potentiometer further clockwise, the sensor already reacts to little sun. The roller shutter moves very early into the sun position and remains closed for a very long time.
If you turn the potentiometer counterclockwise, the sensor reacts only to a lot of sun. The roller shutter moves late into the sun position and does not stay down for very long.
Note: The imprint has changed during the series. Until 2019, the sun was printed on the left and the line became thinner from right to left. Since 2019, the sun is on the right and the stroke is getting thicker from left to right. However, the function has not changed.