Blower speed control
Air conditioning ventilation power is adjusted by a device that controls the blower speed. Three types of adjusting devices are used:
- Passive resistive devices that are adjusted in steps and contain two or three resistors corresponding to three or four speeds. The resistors are made of wire coils or mounted on a ceramic support.
- Analogic module which use a voltage control to control the speed of the blower
- Numeric module which use Pulse Width Modulation (PWM) signal to control the speed of the blower