Vibrating Boiler

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Old 11-25-13, 07:54 PM
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Vibrating Boiler

I have a hot water heating system/gas boiler that vibrates the whole house every time it shuts down. It seems like the vent fan is causing the vibrations as it spins down.

While running, there doesn't seem to be any vibration issues. Pressure (on a new pressure gauge) shows 15psi and I recently emptied the steel pressure tank.

Any thoughts/suggestions?

Thanks in advance,
Mike
 
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Old 11-25-13, 08:04 PM
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What vent fan? we need boiler models and pictures.
 
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Old 11-26-13, 06:53 AM
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It's a Weil-McLain HE II Boiler

The black motor on top is what seems to vibrate. I believe it is the blower fan, but I could be wrong. It's mounted on rubber washers, which allows it to move around a bit, but I'm sure it shouldn't be vibrating that much.

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Thanks,
Mike
 
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Old 11-26-13, 12:40 PM
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That is your draft inducing fan.
If you shut the power off and remove the 3 screws that hold it you can check the condition of the blower wheel(squirrel cage). Sounds like maybe a balance problem or loose wheel.
 
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Old 12-07-13, 07:50 AM
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Thanks Spott for the suggestion. I took out the motor and wheel and everything looks okay. It spins easily and other than some surface rust, I couldn't find anything wrong with the squirrel cage or the mounting of it.

I looked at a replacement, but it's around $350, and I'm wondering if I should try anything else before replacing the whole assembly.
 
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Old 12-23-13, 09:31 AM
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Did you solve this problem?

I've got the same boiler and the same problem - vibration. The motor is definitely the source of the vibration. I'm not sure if it's normal or not. I just bought the house. It seems a bit excessive to me though, as it vibrates the pipes running into the wall when running making the entire system pretty noisy.

I am ready to try a new fan assembly unless there is a workaround. I was thinking it might be the rubber grommets which are supposed to isolate the fan motor. However, I can't find those parts.

Thanks!
 
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Old 12-23-13, 10:01 AM
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vibrating boiler

Check the motor bearings for any play especially the one next to the fan.
 
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