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Old 01-08-2013, 10:18 PM   #1
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hooking up new thermostat


I am installing a new thermostat and there is no power to the c wire. The c wire seems to act as a ground. I get 28 volts between the c and r wires. Is this normal? I was looking at the transformer on my furnace and there are 2 leads coming out. A fused blue lead that connects to the c terminal and a yellow lead that connects to the r terminal. There is also a wire connected to the c terminal that is screwed into the box like a ground. Is this normal? I was under the impression that the c wire for the thermostat is supposed to be a 24 volt positive wire. Any help is greatly appreciated!!

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Old 01-08-2013, 10:54 PM   #2
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hooking up new thermostat


R is 24 volt positive.... c is the common....... hope that helps....

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Old 01-08-2013, 11:00 PM   #3
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hooking up new thermostat


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Originally Posted by carmon View Post
R is 24 volt positive.... c is the common....... hope that helps....
If I am getting 28 volts from r to c is that ok?
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Old 01-08-2013, 11:03 PM   #4
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hooking up new thermostat


it sure is.....
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