Do I have a "C" wire connection?


Old 10-22-14, 04:49 PM
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Question Do I have a "C" wire connection?

Hi - Can someone please confirm if I indeed have a "C" wire connection on my board? It appears that I do, since there is a white wire which I believe is coming from my A/C unit going into a spot labeled "C". I am confused because this connection is not like the other 4 standard screw type connectors. I am also not sure how to even add a wire into a connector like this.

Any advise is appreciated, thanks!

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Old 10-22-14, 05:50 PM
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There are crimp on connectors that have a screw terminal on them. You could also spice in a wire with a wire nut.
Old 10-22-14, 05:58 PM
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Yes, that white wire coming from your a/c condenser is going to the C terminal. They make what is called a piggy back crimp connector and a double tab faston connector for applications like that as shown in the attached images. As Grady stated, a quick and easy way to do it is to splice and wire nut a wire.
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Old 10-22-14, 07:53 PM
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Thanks guys! I hadn't worked with that type of connection before and didn't want to pull it out and break anything. :NO NO NO:

Ran to the store and picked up an18/5 wire and ran it from my new thermo to the furnace, picked up a crimp connector, spliced the wires together, connected it all up and I'm up and running!



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