Home Improvement Asked by Kallen74 on May 3, 2021
With the increasing popularity of wifi thermostats I know this question has been asked many times, however I’ll ask it again fr my specific situation.
How do I add a “C” wire to my existing air handler terminal and thermostat.
Here is a picture of the terminal (Magic Aire Dux-8 air handler)
Starting from the left, the C terminal has two wires a large White/Yellow and a green, neither of these wires come out of the wall where the thermostat is mounted. (The wire bundle that comes out wall has 6 wires – Red, Blue, White, Yellow, Green and Black. The Black is not in use at the terminal end or the thermostat end.) Next to the C terminal is the R terminal and has both the red and blue wires attached, part of the 6 wire bundle. The green wire is attached to the G terminal, also part of the bundle. Y has a yellow wire, part of the 6 wire group, and a red wire not a part of the wire group. W has a white wire, part of the bundle, and a large White/Blue wire not a part of the bundle. W1 is not in use.
This picture is self explanatory with two exceptions:
– the black wire mentioned earlier, part of the 6 wire bundle, is present but not in the picture.
– the blue wire is connected to Rc
So, now the questions are:
1.) how to I connect a wifi thermostat that requiers a C wire?
2.) can i simply use the unused black wire as a C?
3.) does the blue need to be connected the Rc on the wifi thermostat?
In your case, the red and blue wires are connected to the same terminal on the air handler, and that's just not necessary. Connect the blue wire to the C terminal on the air handler along with the yellow/white and green.
On the new thermostat, the blue will then be your C wire, and there will normally be a jumper or small wire that connects the Rc and R terminals, so the red wire only needs to go to one of the R terminals. The two different "R" terminals are used if the air handler/heater and outside AC unit happen to use different power sources. In my experience this is very rare to the point that thermostat manufactures pre-install a jumper between them.
Answered by JPhi1618 on May 3, 2021
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