New Fan Motor runs hot??!!

[inhim2r1]

I have just installed a Fasco D291 into a bathroom vent fan... the amperage and horsepower are exactly the same as the motor that I removed and the motor is running very hot. I metered the amps and am well below the max... can someone shed some light on my hot motor??

[Coolmaniac]

I've had some small frame motors come dragging a bit, because the bolts that hold it together weren't tightened evenly or too much. They should be even and just snug. And don't over tighten it to the mount. Since its not over amping, might be a mismarked lower volt motor, take it back and exchange it if it makes you nervous.

[teckster]

How hot is it did you take a temp of the motor or is it hot to the touch most motors run 40c which converts to 104F plus ambiant temp so if the room is 70 then the temp would be 174Fand that is normal.

[james mo]

Does this motor need a small cooling fan blade on the shaft. If you have an air over motor that is not in the air stream, it will overheat.

[ersham]

is this oem motor?
if not it may be undersized

[inhim2r1]

I don't know if the motor is OEM because the one I removed was not original either. I am very new at this job so there have been other hands in our "stuff". The motor that I removed was the same but I don't know how long it was in this fan. As to the temperature... I did not truly measure the temperature but I cannot touch the motor while it is running or I will get burned... seems like more than 174 degrees farenheit to me. I tried to call Fasco and they could not tell me any running temperature specs. Thanks for all your comments, truly appreciated.

[mattm]

Is it direct drive or belt drive ? If the belt is too tight it will get hot like that. I think I would go to the fans manufacture and see what was originally in there.

[inhim2r1]

I took the advice of a couple of you and put a probe thermometer on the motor windings. The hottest, after running for almost 45 minutes was 145 degrees farenheit. The is well within the running specs for the motor. I truly appreciate all of your good advice, thanks again.

[rotaryfrk]

I took the advice of a couple of you and put a probe thermometer on the motor windings. The hottest, after running for almost 45 minutes was 145 degrees farenheit. The is well within the running specs for the motor. I truly appreciate all of your good advice, thanks again.

WOW you put a probe thermometer on the windings to get a temp reading?

Did your thermometer also tell you the operating voltage?

Just curious!

[inhim2r1]

I guess I was in such a frustrated state I didn't really think about the voltage... that was a great comment though, I and my boss laughed pretty hard, thanks you actually brightened our day!

[Airmechanical]

its helpfull to always post rated and actual amps!



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[raidersfan7]

it was not an ao smith motor by the wayyyyyyyyyy?