On many installed furnaces, the original (OEM) blower motor is a PSC model. Short for permanent split capacitor, PSC motors are designed to do what furnace motors have always done in the past: simply turn on and off. The output of a PSC motor isn’t controllable and it has no intermediate speeds.

What does PSC stand for in HVAC?

A PSC (permanent split capacitor) is a type of motor used that turns on and off. It’s commonly used on fans, blowers, small pumps and gear motors. Chances are, your existing HVAC equipment has a PSC motor. With a PSC motor, the electrical output is not controllable and has no intermediate speeds.

What is a PSC unit?

A PSC or permanent split capacitor is a type of motor that is designed to do two things. … Because the motor operates at a constant speed, the use of energy is a constant and efficiency is lost. ECM Motors. ECM or electronically commutated motors save energy and improve the efficient movement of air through your unit.