Make one of your wires from the 12 2 either red or black a direct power to your thermostat.
Attic fan thermostat o off switch.
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If your fan has a thermostat turn the fan on and off bypassing the thermostat.
The thermal switch will turn off the motor when the temperature in the attic reaches 70 f.
Start by screwing the thermostat switch to the plywood frame that houses the fan.
In other words that switch will go straight to the fan motor.
Most either come with a programmable thermostat or can be wired to one which will turn the fan on when the attic reaches a set temperature no need for flipping a switch or monitoring the attic.
Switch off the power of the attic fan and remove the power cord.
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Locate the thermostat casing and open it using a screwdriver.
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If you notice that the attic fan is not switching on or off according to temperature variation it indicates that the thermostat is no longer functioning properly.
The replacement is quite simple and straightforward.
Place it so it s facing in the direction of the air that s being drawn out of the attic by the fan.
The thermal snap switch is a small device which attaches to the attic fan motor designed to turn on the natural light solar attic fan when the temperature in the attic reaches approximately 80 f.
An attic fan thermostat is an automatic monitoring mechanism that switches the attic fan on and off according to the changing temperature in the attic.
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Sometimes it works out more economical to replace the attic fan thermostat instead of repairing it.
If the fan comes on you know that the problem lies with the fan thermostat.
It is easily installed on the wires under the fan.
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Function of the thermostat.
Remove the cover of the thermostat to expose the black and white wires as well as the green ground screw.
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Make the other wire from your 12 2 run off your switch to your fan and splice it in with the wire going from the thermostat to the fan motor.