ECM motor
What it is
A PSC blower motor will work up to about 0.5 in. WC, then it will “fall off,” i.e., the motor will stop pushing, although the fan will continue to turn. With an ECM, although it is most efficient at 0.3 inches of static pressure, it will continue to work if the static pressure goes up, even as high as 1 in. WC.
A variable speed pump with an electronically commutated motor (ECM) can raise or lower the hot water flow rate through a system to match the demand load.
Its parts
Related pages
- Glossary: ECM motor
Its entry, and the guide's pages that use it.
Sources
- U.S. Department of Energy. High-MERV Filters (Building America Solution Center).
- ENERGY STAR. ENERGY STAR Commercial Boiler Design Guide.