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need help hooking up booter fan to variable speed furnance

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don_185
don_185 Member Posts: 312
in THE MAIN WALL
Would that not defeat the purpose as to why you purchase the variable speed motor in the first place?

I think if all possible you would be better off at changing the duct work.

You could add a relay if your t-stat bring on the fan and both heat/cool mode.

IMHO..I think what you are about to do is nothing more then a bandaid.

good luck!

Comments

  • Gene_8
    Gene_8 Member Posts: 5


    no place on control board to have a booster fan come on with blower
  • Gene_8
    Gene_8 Member Posts: 5


    no place on control board to have a booster fan come on with blower
  • John Mills_4
    John Mills_4 Member Posts: 43
    Most

    VS furnaces power the line voltage to the motor constantly and the electronics tells it when to come on & off.

    I would think the furnace would have an EAC terminal putting out 120V anytime the board energizes the blower. Put a relay with a 120V coil on those terminals to turn on & off your booster.
  • Gene_8
    Gene_8 Member Posts: 5


    john eac terminal is putting out 120v without energizeing the blower. Thanks For Helping
  • Gene_8
    Gene_8 Member Posts: 5


    don finsh basement. ya bandaid. relay will work. thanks
  • Mitch_4
    Mitch_4 Member Posts: 955
    Do you

    need only in heating mode? use the HUM (humidifier term).

    EAC should only be powered when the blower running. Not a steady 120.
This discussion has been closed.

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