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Thread: Auto re-set and wiring diagrams.

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    Default Auto re-set and wiring diagrams.

    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. #2
    Electrical Contractor/Instructor jwelectric's Avatar
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    Try pushing the reset button.

    Smell the motor it may be burned up

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    DIY Senior Member BrianJohn's Avatar
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    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.

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    DIY scratch-pad engineer leejosepho's Avatar
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    Quote Originally Posted by don metzinger
    ... 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??
    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.

    Quote Originally Posted by don metzinger
    Looked for a wiring diagram for dayton motors ...
    As you had mentioned, that is usually somewhere on the motor.

    Quote Originally Posted by don metzinger
    ... wondered if the timer only runs down while there is current flow though it.
    A spring-loaded, mechanical timer does not need power to run down, and an electronic one would probably reset after an outage.

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    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

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    Sorry for the problems with the postings, there are always a few who cause problems for the rest. - Don
    HuH?

    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.

    bob...

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