Auto re-set and wiring diagrams.

Discussion in 'Electrical Forum discussion & Blog' started by don metzinger, Jul 6, 2007.

  1. don metzinger

    don metzinger New Member

    Sep 17, 2005
    Hi, have a dayton 2 speed motor on a whole house fan that quit working and have a couple of questions. Checked and have voltage through the timer and control and to the motor.The motor has a automatic re-set for the thermal protection, do these things stick sometimes?? would putting the motor in the freezer help, assuming the auto re-set comes about from metal expansion and contraction with heat?? The 3 black wires in the motor have T1, T2 and T4 printed on them, are T1 and T2 the different speeds and T4 the netural?? Looked for a wiring diagram for dayton motors and could not find one. I forgot to look on the underside of the cover, usually they have a basic diagram there. The control is a dayton wondered if the timer only runs down while there is current flow though it. Plan to test the motor with test clips and want to make sure I get them hooked up right so I don't damage the motor. Thanks for any input. - Don
  2. jwelectric

    jwelectric Electrical Contractor/Instructor

    Jun 14, 2007
    North Carolina
    Try pushing the reset button.

    Smell the motor it may be burned up
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  4. BrianJohn

    BrianJohn DIY Senior Member

    Jun 22, 2007
    Other than mentioned, If accessible you can utilize an ohm meter and read across the thermal cutout and see if you have continuity (thermal is made). Also might try reading with the ohm meter from T1 to T2, T2 to T4 should have resistance, and then T4 to ground (fan case) and you should have an open reading, no continuity.
  5. leejosepho

    leejosepho DIY scratch-pad engineer

    Nov 23, 2006
    disabled-retired industrial fabricator
    200 miles south of Little Rock
    Those thermal switches are bi-metal buttons that flex under heat. They can go bad, and I doubt putting yours in the 'fridge would revive it if it is bad.

    As you had mentioned, that is usually somewhere on the motor.

    A spring-loaded, mechanical timer does not need power to run down, and an electronic one would probably reset after an outage.
  6. don metzinger

    don metzinger New Member

    Sep 17, 2005
    Thanks for the replies. Will be working on it later today. Sorry for the problems with the postings, there are always a few who cause problems for the rest. - Don
  7. speedbump

    speedbump Previous member

    Jul 15, 2005
    Water well and pump tech.
    Riverview, Fl.

    The numbers T1 - T4 could mean a lot of things. A diagram would sure be helpful. Two speed motors have more leads than single speed motors and if it's a cap start motor would have points also.

    Dayton is a name Graingers uses so that is not necessarily the brand motor you have. It could be one of many brands they use.

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