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I was just reading on how you were talking about altering an

Customer Question
attic fan and you said...
i was just reading on how you were talking about altering an attic fan and you said " If you want to just be able to override the thermostat to turn the attic fan ON at night, there is a very simple solution. You just need to parallel the thermostat with a standard wall switch. If you need a diagram to see how this is done, let me know" could i possibly see that diagram? i have a t stat controlled fan for ventilation in my shed but when it gets bellow 60 degrees outside i cant turn it on when i need. i just want complete manual control over it
Submitted: 2 years ago.Category: Electrical
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Answered in 12 minutes by:
9/16/2015
Electrician: Jason, Service Technician replied 2 years ago
Jason
Jason, Service Technician
Category: Electrical
Satisfied Customers: 4,287
Experience: Over 20 years of experience in all types of installations, troubleshooting, and repairs.
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I can post the diagram for you, but it would have to be this afternoon. I work full time away from this site, and am just about to head out the door. If I get it posted to this chat this evening, would that work for you?

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Customer reply replied 2 years ago
yeah whenever is most convenient for you. thank you very much!
Electrician: Jason, Service Technician replied 2 years ago

Hello again. Are you able to open the thermostat box, to expose the wiring? If so, please do so, without disconnecting anything. Then, take a photo of the wiring and post it here. That way, I'll be able to direct you in where to connect your new wiring. Thank you.

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Electrician: Jason, Service Technician replied 2 years ago

The photo looks fine. I see that the supply wire feeding the thermostat is #12 wire. That could mean the circuit is on a 20 amp breaker. If so, you'll need to use 20 amp wire as well, and a 20 amp rated switch. 20 amp wire is #12.

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Electrician: Jason, Service Technician replied 2 years ago

I'm searching your photo for two wires connected to an adjustment knob assembly. Do you see anything like that?

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Electrician: Jason, Service Technician replied 2 years ago

It looks like there are 2 black wires, each attached to a metal tab near the knob.

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Electrician: Jason, Service Technician replied 2 years ago

If you follow each of those wires into their respective wire nuts, those are the 2 splices you need to add your new wire to.

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Electrician: Jason, Service Technician replied 2 years ago

One of those existing black wires will be live at all times. Please use some type of tester to find that live wire (even when the thermostat is off ).

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Electrician: Jason, Service Technician replied 2 years ago

Once the feed hot is identified, add the white from the new piece of 12-2 to that splice. Put the black from the new 12-2 in the splice with the other original black on the small metal tab by the knob.

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Electrician: Jason, Service Technician replied 2 years ago

The other end of the new section of 12-2 will go to the new switch. White wire to top terminal on switch, black wire to bottom terminal.

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Electrician: Jason, Service Technician replied 2 years ago

Complete your grounding, turn the breaker back on, and test operation. Please post the results here.

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Jason
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