You program the board appropriately and both the adjust and cool profiles to as close to 1200 CFM as you can. For the AC to function correctly, we need a total of 1200 CFM or 400 CFM per ton. Let’s think of a hypothetical AC – 3 ton AC. After programming the desired CFM, the motor and the module will automatically work out what to do. In the place of the steering column is the board, which controls the ‘direction’ in the sense that it controls the furnace or AC profiles – delay, heat, adjust, and cool. It functions by tracking the torque, RPM, and CFM (in the place of the mph). This is the same principles that the ECM motor uses. The motor senses less torque and therefore, reduces the RPMs to maintain the predefined speed. The same case applies when you travel down a hill. When you get to a hill, the cruise control will sense a change in torque and will rev up to maintain the predefined speed. Obviously, as you set the cruise control, the motors will have a certain RPM.

The cruise control is the program that pre-defines how fast the car should move.

I admit it, it can get a tad confusing.įor a better understanding, let’s consider how an ECM motor works on an electric car that has cruise control on. When there is a change in torque, the motor increases or decreases the RPM, therefore, maintaining the predefined CFM. The ECM motor is capable of maintaining a programmed CFM whilst responding to changing torque. As mentioned above, it connects to the module through the 16 pin harness. The control board is the component that stores the desired CFM for the application.

Ecm magic engine