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Faunsdale, AL | Check voltage at the motor while it's running. See if somehow you have a bad connection somewhere so the voltage is dropping to below 200 volts or so under load. Many motors are rated 208-230 to operate on voltages anywhere from ~200 to 260 volts without problems.
Also check the reconnection jumpers in the motor. Perhaps you don't understand how the little tiny diagram indicates to connect the leads. A rule of thumb......when you supply half the voltage, a motor delivers about 1/4 the horsepower it is supposed to..........IF it can even start the load!
Be sure to check rpm of the replacement motors. Could be mislabeled? After all, an 850 is definitely an odball motor in the whole range of motors out there and likely being made in China now, sometimes things get lost in translation. Got a tachometer you can check it with?
Reason the rpm is so important is when you double the rpm, you quadruple the hp required, so a 1100 rpm motor would have to be 1 hp and a 1750 would have to be 2 hp to run that same blade. Just as an example we have an old fan I got used out of a factory. It had a 5hp 3500 rpm motor on it and would almost blow you over if you stood in front of it. Motor burned up after several years and I didn't have another one, so we put a 1.5 hp 1750 rpm on with the same pulley as the old one. Runs right on the amperage it's supposed to and moves plenty of air for where we have it.
I have a few Dayton fans like yours which we have had for a long time. They have been very reliable. Got some of another brand (4 strip steel blades) that are 20+ years old and still going strong. Shed they were in got blown down by tornado this spring. Pulled fans out, strightened up sheetmetal as needed and reinstalled them in new shed. Still going strong!
Have a lot of Shaeffer fans with the white plastic guards on them. Haven't lasted anywhere near as long. Seems like they just can't stand the "normal" thunderstorm jolts we get around here. Had both single and 3ph Shaeffers. 3 phase seems not to help reliability in the small fans like I thought it would, or mayb that's just the Shaeffers :>)
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anybody else having problems with Dayton electric fan motors?
