I just installed a master flow attic fan. I ran it for a minute or two and it started loosing air flow. I turned it off and now when I turn it on it just buzzes. Any ideas what I need to do to resolve this problem?
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I had a roofer install Master Flow PRO 3 and he did the initial wiring incorrectly. The black wire pairs were incorrectly connected and caused the fan to run 24-hours. I switched the black wires pairings and the fan shuts off if less than 100-degrees (the setting I chose) and comes on if more than 100-degrees. You may want to be sure that the black wire from the power source is connected to the black wire for the thermostat (black wire nearest the thermostat setting switch and closest to the power source wire). The black wire from the fan motor should be connected to the black wire closest to the fan motor's wire.
If you have basic carpentry skills it is a 6 on a scale of 10 for difficulty. You must cut a hole in your roof, install the fan and flashing that comes with the fan then replace the shingles that were removed in the process
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
that switch is to change direction on the way the fan is blowing
one direction for downward blowing
the other direction is for upward blowing
depends on the area you have to determine which is the best, but i doubt area restriction will hamper force air blowing, air will flow regardless, the area might be big so you dont feel it.
as being living in the attic, HOT AIR rises, so you might want to invest in some installation for the ceiling, because whent he sun hit the roof, it will create an oven effect, in your living area. the hot air is always present, you should have a ventilation fan blowing the hot air out, like thru a small window, the more hot air you blow out, the better.
not sure if this make sense. not sure how big the room is, as FANs are NOISY by nature.
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...