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Noisy Heil Gas Wall Furnace..Fan or bearings??

If i hold the motor shaft tightly by hand, I can still turn the fan blades while the shaft is not moving. Are these variable speed fans??
Omega 79

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  • cheldp Oct 06, 2009

    I must clarify my question regarding my Heil Gas Wall Furnace Fan. With power off, I can grasp the motor shaft with one hand while easily rotating the fan blades with the other hand. The fan HUB is stationary. It is firmly attached to the motor shaft with a set screw (on flat Side). Is the fan defective or is it a thermal heat type fan?? Furnace unit is very old. Thanks for responding to my original question. Omega 79



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No, The fan should be secured with a set screw at the hub and not slip on the motor shaft Depending on the motor rating, It should be difficult to stall the motor by hand. But, no, they are not variable speedin that manner. It should be one with the shaft. Good Luck, Ned

Posted on Oct 06, 2009

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  • Ned C Cook
    Ned C Cook Oct 06, 2009

    I think you are thinking of the type of fan they use in cars, or something similar.. Is it a aquirel cage fan or does it have blades? Ifit is a viscous fan it should have a hub that would contain the viscoius fluid. It should have a thermal coil in its center also. If it does ha a viscous drive, it would feel sluggish as yo turn it by hand. Can you hear it pick speed as the air gets warmer?? If you have a digital Cam and can take a pic, I would like to see this fan and its mounting. Get a good one of the hub. Use your phone cam and send it/them to 909-630-3192.

  • Ned C Cook
    Ned C Cook Oct 07, 2009


  • Ned C Cook
    Ned C Cook Oct 07, 2009

    Honestly, that is what I am trying to figure outCan you renove the fan? If it is variable, what regulates it and does it have a bearing hub? It could possibly be a sprag type hub so the fan can coast when the motor stops to prevent the fan from driving the motor. If you turn the motorshaft in proper direction I be the the sprag clutch locks the fan to turn it and when the motor stops the fan is free to spin on.



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