Question about Cool Attic 3011 Duct Window Mount Fan

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After running awhile (mostly when on low speed) the attic fan starts rumbling. It will start and stop that occasionally. What might that be?

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Bearing problem, try WD40 on bearing case. Time to start looking for new replacement motor

Posted on Jun 06, 2010

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In many mobile homes this scenario is very common, less so in permanent homes, but here is how it works; The heat side of your fan which is the low fan speed is not dependant on the thermostat it's heat activated. Your already aware of this to some degree because you had the limit \fan switch replaced. I've taken that approach to that unit myself. In reality what probably is happening is on hot days your unit is warming up by being hit by sunshine and then it clicks the fan on at 140 degrees. This especially happens if the unit is on the roof or a split system in the attic. Remedies; run your A\C to cool it down, keep your attic cooler by way of an attic exhaust fan(which saves you cash anyway). Or if your not regularly using A\C turn breaker off til you need it. In the end there may be something going on, but odds are I'm dead on. Good Luck

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It sounds like you are replacing a two speed motor with a single speed. Check the side of the old motor and see if it has high and low speed wiring schematics. If so you need to replace with same model number. Good luck!

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I need to verify you have adaquate air flow, to cool the motor. If you have a window open, and the crawl hole open is there enough air flow into the the attic? It there is enough air flow and it still stops after about an hour, does this unit have a humidistate and a temperature switch on the housing or extension.
If all the switches are working correctly then I could be the motor overloading/heating shutting down and then reseting.
InMrFixIt

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1 Answer

Shutters closing while running


The shutters should be gravity closed, which means they are counter weighted just enough to close with no air flow...  when the fan starts, it will create a slight pressure differential across the shutters - when that pressure overcomes the counter weight, the shutters should open...  I assume you open windows and/or doors when the fan runs...
I would check for the following items: a) (unlikely) check to see if the counter weight is adjustable, if so, it may be slipping and needs reset.. I think this is unlikely as I think most shutters do not have adjustable counter weights -- check last)
b) check your attic vents to the outside -- the air being blown into the attic must escape to the outside world, otherwise it will build up pressure and the airflow will drop or stop altogether -- this sounds like what is occurring, at slow speeds, there is insufficient airflow to open the dampers, at high speeds, they open long enough for the pressure to build up and then they close as the air flow diminishes
c)  have you replaced windows, caulked up windows, made any modifications to reduce the flow of air into the living areas -- air must enter the house just as air must leave the attic (assumes you don't open windows or doors)
d)  if you have a fireplace, check to make sure some animal or other hasn't plugged up the chimney -- if the house is tight, the attic fan will pull air from the chimney unless it is blocked
hope this helps...

Jul 25, 2008 | Ventamatic Direct Drive Whole House Fan...

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