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#1
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Fan motor starts slooooowly
I've seen a number of older exhaust fans that start very slowly. Turn them on,
they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? |
#2
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Fan motor starts slooooowly
Bob F wrote:
I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? First thing to try is lubing the bearings I would think Rheilly P |
#3
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Fan motor starts slooooowly
On Sep 5, 4:10*am, Rheilly Phoull wrote:
Bob F wrote: I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? First thing to try is lubing the bearings I would think Rheilly P If you are talking about the roof attic fans, the motor might be starting to go. They sell replacement motors at Lowes or HD and they are easy to change. |
#4
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Fan motor starts slooooowly
Mikepier wrote:
On Sep 5, 4:10 am, Rheilly Phoull wrote: Bob F wrote: I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? First thing to try is lubing the bearings I would think Rheilly P If you are talking about the roof attic fans, the motor might be starting to go. They sell replacement motors at Lowes or HD and they are easy to change. Sure, that will fix it but having spent a large part of my work life sorting that sorta stuff I can tell you a lot of the time the motor runs away with no attention until it stops or exhibits the symptoms described. The manufacturers provide ports to apply periodic lubrication which are by and large ignored by the average punter. A slow start is almost certain to be an underlubricated bearing or one that has been worn out by long usage or underlubrication, usually both. Nowadays the cost of professional maintenance can exceed the cost of a replacement (assuming you DIY) so there ya go. For me there is nothing to lose with trying a squirt of light oil on the bearings before spending ya moola :-) Cheers ............ Rheilly P |
#5
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Fan motor starts slooooowly
In article , Rheilly Phoull wrote:
Bob F wrote: I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? First thing to try is lubing the bearings I would think Nope, that's the second thing. First thing is to check for two decades' worth of dirt and crud built up on the blades, and clean as necessary. |
#6
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Fan motor starts slooooowly
"Bob F" wrote in message . .. I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? I've seen this a number of times with bathroom exhaust fans. After removing the internal parts and cleaning them thoroughly, performance on many of them improves. Gunk tends to build up on the fan blade which I surmise causes it to be heavier than the little motor was designed for. If not then I replace the motor and blade or install a new and improved (Panasonic) bath fan. |
#7
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Fan motor starts slooooowly
"Bob F" wrote in message
. .. I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? I assume you are talking about the motors without a capacitor and a start terminal. These motors develop weak torque until reaching full speed. The lubrication gums and the motor spins slow for awhile. It is best to dissasemble the motor, degrease the bearings and apply a light oil (like 3 and 1 motor oil). |
#8
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Fan motor starts slooooowly
Cause they're gummed up with ****. Need to disassemble them, clean them
with brake cleaner, and relube the end bushings. s "Bob F" wrote in message . .. I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? |
#9
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Fan motor starts slooooowly
The folks I have worked with tell me that three in one is a poor choice for
motors. It (three in one) dries out rapidly. Same with WD-40. The good choice is ND-30 motor oil, or zoom spout turbine oil. The gas mix oil for two strokes is supposed to be good, also. Cleaning the blade sounds like a wise action, also. -- Christopher A. Young Learn more about Jesus www.lds.org .. "JohnR66" wrote in message ... The lubrication gums and the motor spins slow for awhile. It is best to dissasemble the motor, degrease the bearings and apply a light oil (like 3 and 1 motor oil). |
#10
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Fan motor starts slooooowly
On 9/5/2008 4:03 AM Rheilly Phoull spake thus:
Mikepier wrote: On Sep 5, 4:10 am, Rheilly Phoull wrote: Bob F wrote: I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? First thing to try is lubing the bearings I would think If you are talking about the roof attic fans, the motor might be starting to go. They sell replacement motors at Lowes or HD and they are easy to change. Sure, that will fix it but having spent a large part of my work life sorting that sorta stuff I can tell you a lot of the time the motor runs away with no attention until it stops or exhibits the symptoms described. The manufacturers provide ports to apply periodic lubrication which are by and large ignored by the average punter. A slow start is almost certain to be an underlubricated bearing or one that has been worn out by long usage or underlubrication, usually both. Nowadays the cost of professional maintenance can exceed the cost of a replacement (assuming you DIY) so there ya go. For me there is nothing to lose with trying a squirt of light oil on the bearings before spending ya moola :-) True that. To which I would add two things: 1) Most motors will last forever if maintained. They rarely "burn out", but simply get gunked-up bearings. 2) If squirting some oil into the bearing cups doesn't do the trick, then it's time to take the motor apart, clean and lube everything, and put it back together. Helped a friend do that to an exhaust-fan motor that was thickly coated with cooking grease and just sat there and hummed. We knocked it apart (had to use a cold chisel around the cover seam), whereupon one of the armature wires broke off. No problemo: a little soldering-iron action plus some heat-shrink insulation fixed that. Soaked the bearings in paint thinner, cleaned them, lubed and put together. Now it works like new. -- Washing one's hands of the conflict between the powerful and the powerless means to side with the powerful, not to be neutral. - Paulo Freire |
#11
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Fan motor starts slooooowly
"David Nebenzahl" wrote in message s.com... On 9/5/2008 4:03 AM Rheilly Phoull spake thus: Mikepier wrote: On Sep 5, 4:10 am, Rheilly Phoull wrote: Bob F wrote: I've seen a number of older exhaust fans that start very slowly. Turn them on, they barely turn for up to several minutes, then finally speed up fairly quickly to normal operating speed. Can anyone suggest why this happens, and a way to fix them to operate properly? First thing to try is lubing the bearings I would think If you are talking about the roof attic fans, the motor might be starting to go. They sell replacement motors at Lowes or HD and they are easy to change. Sure, that will fix it but having spent a large part of my work life sorting that sorta stuff I can tell you a lot of the time the motor runs away with no attention until it stops or exhibits the symptoms described. The manufacturers provide ports to apply periodic lubrication which are by and large ignored by the average punter. A slow start is almost certain to be an underlubricated bearing or one that has been worn out by long usage or underlubrication, usually both. Nowadays the cost of professional maintenance can exceed the cost of a replacement (assuming you DIY) so there ya go. For me there is nothing to lose with trying a squirt of light oil on the bearings before spending ya moola :-) True that. To which I would add two things: 1) Most motors will last forever if maintained. They rarely "burn out", but simply get gunked-up bearings. 2) If squirting some oil into the bearing cups doesn't do the trick, then it's time to take the motor apart, clean and lube everything, and put it back together. Helped a friend do that to an exhaust-fan motor that was thickly coated with cooking grease and just sat there and hummed. We knocked it apart (had to use a cold chisel around the cover seam), whereupon one of the armature wires broke off. No problemo: a little soldering-iron action plus some heat-shrink insulation fixed that. Soaked the bearings in paint thinner, cleaned them, lubed and put together. Now it works like new. -- I seem to have another project to do. Thanks everyone for the feedback. |
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