The blower motor controller module contains solid state circuitry. At a given duty cycle, the circuitry utilizes a pulse width voltage signal from the control head. The circuitry returns an inverse pulse width signal to the blower motor.
Signal to Blower Motor Control Module from HVAC Controller | Signal out of Blower Motor Control Module to Blower |
|---|---|
0-5% Duty | Off (Short) |
6% Duty | High |
7-94% Duty | Inverse Variable Output |
95% Duty | Low |
96-100% Duty | Off |
The control head pulse width signal is based on the following conditions:
| • | The temperature set by the user |
| • | The outside air temperature |
| • | The in-vehicle temperature |
| • | The input from the solar sensor |
For example, the blower motor control module will adjust the blower accordingly when the following conditions exist:
| • | The temperature inside of the vehicle is much colder or hotter than the temperature that the user sets. |
| • | The user selects the AUTO button. |
The blower motor controller module will change the blower from a high speed to a low speed as the temperature inside the vehicle becomes closer to the set temperature.
