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Thread: wiring question

  1. #1

    Confused wiring question

    Hi All;

    We are trying to install a new furnace fan motor. The new unit is a marathon electric CAT NO B208.

    115V single phase AC motor

    There is a wiring diagram, but seems incomplete. I've search their site for wiring an cannot find any.

    The wiring refers to red and black only, and shows you which post to put them on for CW or CCW. (we want CCW - so we reverse them as per the diagram).

    Can you please indicate the rest of the wiring? I don't want to fry the motor getting it wrong.

    The remaining wires are Blue and Yellow.

    Thank you in advance.

  2. #2
    Join Date
    Oct 2008
    Posts
    814
    Are you sure that the new motor isn't a dual voltage so it can be wired for 120 OR 208 VAC application? If so, the sticker on the motor should show two diagrams depicted - one for low voltage input and another for high. Those diagrams will show what to do with those other two wires.

    I presently don't have access to any additional information you're seeking.

  3. #3
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,905
    Whoa, there.

    This is an open forum. Let's make sure this is not DIY, first.

    Are you an HVAC or Electrical professional?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  4. #4
    This is for our home furnace - is this the wrong posting area?

    The spec's read that it's 110V, says nothing about dual volatage.

    It does show "ungrounded line" in the schedmatic, I assume this means the AC source? When I connected it as per the diagram, under no load, the motor keeps going on and off.

    any suggestions?

  5. #5
    Join Date
    Dec 2011
    Location
    Grass Lake, MI
    Posts
    254
    Quote Originally Posted by brodie123 View Post
    This is for our home furnace - is this the wrong posting area?

    The spec's read that it's 110V, says nothing about dual volatage.

    It does show "ungrounded line" in the schedmatic, I assume this means the AC source? When I connected it as per the diagram, under no load, the motor keeps going on and off.

    any suggestions?
    Are you a HVAC tech or contractor?


    Sent from my iPhone using Tapatalk 2

  6. #6
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    Quote Originally Posted by brodie123 View Post
    This is for our home furnace - is this the wrong posting area?

    The spec's read that it's 110V, says nothing about dual volatage.

    It does show "ungrounded line" in the schedmatic, I assume this means the AC source? When I connected it as per the diagram, under no load, the motor keeps going on and off.

    any suggestions?
    Call a pro

  7. #7
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,905
    Quote Originally Posted by brodie123 View Post
    This is for our home furnace - is this the wrong posting area?

    The spec's read that it's 110V, says nothing about dual volatage.

    It does show "ungrounded line" in the schedmatic, I assume this means the AC source? When I connected it as per the diagram, under no load, the motor keeps going on and off.

    any suggestions?

    If you are a homeowner and this is your furnace, and you are not an HVAC pro, this is not a DIY site. Sorry.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







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