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Turbo heater

N

Northeast Puller

Member

I have a 25 year old turbo heater a Ready heat 1500 btu model.
It does not have a dent or scratch on it and has been trouble
free. Over the years I have taken the cover off and blown it
out with shop air and wiped down. So it is not gummed up.
Lately when it is running I get a chirping noise from it. Last
night it started hard and did not start and heard a humming
noise. I unplugged it and re plugged it in and the same thing.
On the third time it started just fine. I took the cover off to
see if maybe the fan was binding or something but did not find
anything and it was not dirty either. So does anyone have any
idea what the chirping noise and the hard start is about. It
does have all the original cover screws in place. So I do not
think the noise is from a lose cover.
 

The pump, which is also the fan motor, has a brushless, permanent magnet motor on it, and sintered bronze bushings on the shaft to keep the rotor spinning between the magnets. Those bushings wear out until the rotor can get too close to the magnets and they touch. If you pull the pump apart, you will find the bushings to be worn off center. I have yet to find a good sources for the bushings in original spec, as they are flanged sintered bronze.
 
Oilite is one maker of flanged sintered bronze bushings. www.oilite.com

Most bearing suppliers (Motion Industries, Fastenal, McMaster-Carr, etc.) will offer several brands.
 
Your local HVAC supplier should have little goose neck bottles of "Turbine Oil". Go buy a bottle and oil your bearings first. If no go you need a fan / pump.
 
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