Installing New Wifi Thermostat (Adding C Wire)


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Old 03-15-14, 09:54 AM
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Installing New Wifi Thermostat (Adding C Wire)

I'm Looking to hookup a new Wifi Thermostat which requires C wire.

I have 5 wires from thermostat to Furnace. Blue is unused from the thermostat but from the furnace junctions to the A/C. Yellow is unused from furnace.

I understand I can disable the manual control of the fan to achieve my goal.

Power to Furnace and A/C is off.

Current Setup is show in pic.

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Old 03-15-14, 10:33 AM
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Welcome to the forums.

You have five wires between your t'stat and furnace. You don't show the blue wire at the thermostat but it is Common and can be connected to C on the t'stat.

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Old 03-15-14, 11:10 AM
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Do I also have to move my Yellow wire, as you've shown? There is currently nothing connected to the Y terminal at the Furnace.
 
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Old 03-15-14, 12:26 PM
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No....the Y terminal is just a connection point between the thermostat and the compressor. Sometimes just a wire nut is used instead of the Y terminal.
 
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Old 03-16-14, 10:36 AM
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I had thought that Y was just used as a splice point but Houston, the forum pro, informed me that many air handlers use the Y connection to control blower speeds used. So in this case it would be better to connect the two wires to the Y connection.
 
 

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