Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Furnace CFM

Jon_blaney
Jon_blaney Member Posts: 324
in THE MAIN WALL
Why are the cfm ratings different for ecm and psc blower motors for the same furnace ?

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 25,333
    It would be more remarkable if they weren't different, since every blower wheel and motor combination has different characteristics...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Ironman
  • Ironman
    Ironman Member Posts: 7,622
    ECMs maintain constant torque until they approach their rated horsepower, PSC motors don't. In fact, each speed tap on a PSC motor is actually a horsepower tap. If you run the motor without the wheel, it will go to full speed on any tap.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.

Categories