Exhaust fan hood for kitchen stove

[Snapperhead]

Just replaced a dayton 1725 rpm , 1hp , 220 v , 56 frame ...... with the same motor (grainger was only place in town with one )

The only difference is this new one has a manual reset button for OL , old one has internal self resetting one.

2 hours after install , they call said it stopped.

I go up there , remove motor , its hot as the devil ofcourse being its on top of a STOVE , let it cool off 15 min , hit the reset , and its fine.

OK I see , this thing wants to play games with me .

I take the internal OL self resetting switch out of the old motor, and install it into this new one.

24 hours later its still running fine.

I told them to call me right away if they notice it turning off and resetting. No calls yet.

Anyone ever ran into this ????

Im assuming theres probly a special motor just for hoods with alot of heat ??

[2sac]

You can order motors without overloads. We have a local motor distributor that will remove the overloads, if need be, for hood exhausts for us before we pick them up
And Grainger is good for...

[Kenscom]

Just replaced a dayton 1725 rpm , 1hp , 220 v , 56 frame ...... with the same motor (grainger was only place in town with one )

The only difference is this new one has a manual reset button for OL , old one has internal self resetting one.

2 hours after install , they call said it stopped.

I go up there , remove motor , its hot as the devil ofcourse being its on top of a STOVE , let it cool off 15 min , hit the reset , and its fine.

OK I see , this thing wants to play games with me .

I take the internal OL self resetting switch out of the old motor, and install it into this new one.

24 hours later its still running fine.

I told them to call me right away if they notice it turning off and resetting. No calls yet.

Anyone ever ran into this ????

Im assuming theres probly a special motor just for hoods with alot of heat ??

I am pretty sure kitchen exhaust fans are not to have overloads in the motor.

[Snapperhead]

ok so if the problem comes again i can just remove it entirely ?

Fine by me

All it does is sit between incomming L1 and the field wire , klixon type

[Kenscom]

ok so if the problem comes again i can just remove it entirely ?

Fine by me

All it does is sit between incomming L1 and the field wire , klixon type

Is the motor on the roof inside of an upblast vent system with a domed lid over the motor? Is it a belt drive system? The units I see without overloads in the motors are belt driven with a ducted vent to cool the motor. I have seen downblast vents installed in place of commercial kitchen upblast with poor results. Another thing is some motors have a bogus HP rating on them. Amp draw works the best to make sure the new motor is as big or bigger than the old one.

[Snapperhead]

Is the motor on the roof inside of an upblast vent system with a domed lid over the motor? Is it a belt drive system?

yes and yes ..... but the motor isnt in the air stream . Air blows up outside of where its mounted. Im surprised the motors dont self destruct.

[Kenscom]

yes and yes ..... but the motor isnt in the air stream . Air blows up outside of where its mounted. Im surprised the motors dont self destruct.

Usually an air duct is on the side directing cooling air over the motor. About half of the ones I have seen the electrician ran the service through this air duct. If the duct is blocked or the lid is not making a good seal the motor is likely to overheat. The shaft hole under the motor is in a low pressure under running conditions that creates flow from the cooling duct through the shaft hole then into the air stream. I hope this helps.

[Snapperhead]

I will have to look next time im over there

I figured that shaft hole would pull negative air , but didnt pay attention where the inlet was

Maybe like u said , someone ran elec thru it

[samservice]

I don't recall seeing any motors with resets. A lot of bigger restaurants have exhaust fans that are controlled by motor controllers with overload protection. We also have a customer that has multiple fans - each with it's own VFD. The VFD's are networked to a master controller that has a modem that will dial out to the manufacturer if there is a problem detected. The hoods have smoke and heat detectors that connect into the controller and it increases or decreases the speed of the motors to compensate for the amout of heat/smoke. If you ever encounter one of these CALL THE MANUFACTURER of the controller. It will same some time and heartache.

We have been doing these for about 2 years and it has been an experience. I have seen exhaust fans do weird things.