Question about Dayton Electric Heater

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Just bought a Dayton electric heater to heat a 12' X 20' greenhouse in October. When the heater comes on it now makes a loud sound as if the fan is hitting something. I have it mounted horizonally near the ceiling of the greenhouse. The unit is connected to a thermostat. 25,000 BTU Dayton heavy duty electric heater

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If it sounds like the fan is hitting something, It is likely you will have to get a step ladder, and look closely at what is making the noise-
Likely something fell in there-- and needs to be removed.

When you shut the thermostat down, does the fan stop instantly?

Mack B

Posted on Dec 28, 2010

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  • cengelhaupt Dec 28, 2010

    Thanks and I looked in from the top of the unit. It appears that the motor housing itself is causing the rattling. Do the motors come loose on these units to rattle against the housing?

    The noise stops once the unit shuts off and starts to slow.

  • Mack Baxter Dec 28, 2010

    Good!-- So-- as you watch the fan turn, it does not seem to be bent or a blade broken or missing? (Easier to note, as the fan slows down..) There was no mud wasp nest built on it, or something to make one blade out of balance?

    As for the motor mounting- On the larger motors (over 1/4 hp) they usually have a heavy frame and mount on a flat plate..-- Those bolts can get loose-- and the whole motor will move around..
    More often the motor has some rubber vibration isolating rings, or bushings-- Usually held tight by a clamping bracket-- with a nut and bolt to tighten the clamping ring.-- They do get loose, also.
    Or sometimes the motor itself can have a winding go bad-- THEN-- it will only make the bad NOISE, when the motor is energized- I wonder if that is what you are noticing? Does the objectionable noise stop instantly, when the power is shut off?-- or does the nose gradually reduce, as the fan blade decreases?-- Instant, and steady noise only when the motor is energized-- a clue of a bad winding--- No danger-- but the noise is terribly irritating-- and the humming vibration will eventually do damage.

    Let us know what you observe now-
    You are a good observer! :-)

    Mack B

  • cengelhaupt Dec 29, 2010

    Thanks so much "Mack"...the noise stops immediately upon disengagement. As the fan winds down there is no impediment to the blade or unusual slowing or stopping, just the irritating noise. I will unplug the unit, see if I can take a panel off to access the bolts to the motor mount and attempt to tighten if needed.

  • Mack Baxter Dec 29, 2010

    Good to hear your plans--

    And-- remember-- if you find nothing loose-- but you still hear the noise-- and put your hand on the motor housing, (with the motor running)-- it may be vibrating due to an electrical winding's problems--
    If so-- Dayton Motors (Grainger) may replace it free-- if it is within a year of new?-- maybe even longer-- if you are 'not satisfied'-- for a motor should run for YEARS without this type of a failure. Likely a defect when it was made.

    Just be careful up on the ladder!-- Remember your ladder safety principles-- like NEVER on the top step, and don't lean too far from vertical.

    May you have a safe holiday/ vacation-- or few days off.

    Mack B



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