All attic fans, by enforced standards and codes, have a thermal fuse. Most are one time fuses wich trip usually when resistance to the motor reaches a peak point. This almost always happens when your motor gets older and needs to be replaced. Resistance occurs and progresses when dirt,dust, grime ect build up on the once freely spinning system. There are some savy folks on the web that get into soldering on a new fuse but at the risk of time, fire and electricution... you'll be better off buying a replace motor and putting your faith in the professionals.
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I have an old robbins and myer attic fan. The motor is bad and there is no sticker let on the moter saying what hourse power or voltage the fan is. The model number is BV24. I couldnt find anything on the web about this model. Does anyone have a clue what kind of motor i need
There's probably a thermal switch in the fixture which turns the fan on when the lights are on for a period of time and heat accumulates in the fixture. It sound like the heat from the attic is setting off the thermal switch. When the attic heat drops, the fixture works correctly.
This is a catch 22 situation, because if the upper housing in the attic is insulated from the attic heat, the insulation will prevent heat dissipation from the heat generated by the fixture's light bulbs. So, for safety reasons, the upper housing should not be insulated.
I'll need to work on this to come up with a fix.
I am assuming you replaced your fan by now. However in the future call Gibraltar Industries, they are the ones who manufacture all fans and motors. My attic motor fan also died and I first called Ventamatic and they wanted $65 for a new motor. I then called Gibraltar and they shipped one our for free. 800-527-1924.
First see if the switch has a reverse position. Sometimes you turn the fan assembly in the frame, sometimes you turn the whole frame around. Take the cover off the wiring compartment to see if there are instructions there. Also check on the name plate on the motor, there may be instructions there. Attic fans are usually engineered to blow out.
I just fixed a Broan-353 with a similar problem - the fan was short-cycling, turning on and off within a minute or less.
These fans have a thermostat which is designed to turn off 10 degrees below where it's set to turn on. Apparently, one failure mode is this temperature delta stops working I've had this happen twice, each time after about 3 years.
common motor. get from butler ventamatic or Johnstone Supply if you have an account. Hint, buy a whole new fan for $60; cheaper then buying piece by piece, then you get a new blade,motor and tstat for a little more then motor alone costs.