AC/DC, PWM, Serial Communication…80’s Rock Bands or ECM Communication Methods?

Seems like just yesterday, ECM motors were built by one or two manufacturers and were similar in appearance and performance. Today, there are at least 5 or more brands of ECM used throughout the residential and light commercial HVAC industry with different connections, inputs, and operating criteria. This class will review the common types of operating inputs and characteristics they all share as well as information about different types of diagnostic tools available.