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  1. #1

    Confused Rudd Furnance transformer/fan relay wiring

    I just bought an old house that has an old Rudd furnance with a Rheem 47-19807-01 transformer and fan relay.
    The previous owner changed the wiring so that the fan runs all the time.
    I would like to change the wiring back so that the fan runs only when the furnance or air condition units are running.
    Does anyone have any recommendations on how I should do this.

    Any advice will be appreciated.

  2. #2
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    never the less, if you have not burned it up yet and let him do it!

    .

  3. #3
    Join Date
    Jan 2010
    Location
    Athens GA
    Posts
    1,234
    DIY and letting the smoke out of an electrical device go hand in hand.
    I suggest that you call a contractor for a clean and check on your equipment and he can changethe wiring while he is there,its a very simple proceedure that only takes a few minutes.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,770
    Previous owner may not have wired it to do that. Could be a defective/bad part. Call a contractor and have the system checked.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #5

    Confused

    Thanks for all of the advice.

    I am fairly certain that it is not a malfunction.

    The yellow wire from the fan relay is connected directly to the hot wire coming from the electrical panel.

    When I disconnect the yellow wire from the hot wire where should it be connected.
    The relay has two black wires on one side of the relay connected to the transformer.
    A red, black and yellow wire on the other side of the relay.

    The red wire goes to the limit switch and the black wire goes to the fan motor.

    So would it seem logical that I could connect the yellow wire to the black wire going to the fan without burning up the relay?

    Thanks again.

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,770
    Sorry. This is NOT a DIY site.

    Call a contractor.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  7. #7
    Join Date
    Jun 2007
    Location
    Round Rock
    Posts
    3,403
    I would call somebody out. You can do more damage and cost yourself more $$$ if you let the pro's take care of it. The dude could be fibbing to you. Why would you hot wire a motor to run all the time when all you have to do is turn the thermostat fan setting to "on"? Sounds like something fishy is going on.
    I like DIY'ers. They pay better to fix.

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