Thermostat with HVAC "C" Wiring Question?

607 Views 8 Replies 3 Participants Last post by surferdude2, May 13, 2020

Curban

Discussion Starter · May 7, 2020

Hey all, new here. Thinking of installing an Emerson Sensi Touch thermostat and have a few questions, hoping someone can give me their opinion on before I start. I need a C wire for it which is not currently connected to my thermostat (pic#1), but I have a ton of unconnected wires just behind the wall (pic#2). Based on the photos below, just wanted to confirm that the red wire that has no connection at the thermostat (pic#2), would be the C wire that is shown connected at the furnace connections (pic #3)? Just want to make sure I get it right?

1. Thermostat Wiring

2. Thermostat Loose Wires

3. Wiring at Furnace

Also I have an HVAC in the house, any extra wiring to add the HVAC control (the control beside the thermostat with the hot/cool dial and the off/on/20:40 buttons) to the new thermostat? I haven't popped this control off the wall yet to see the wires so was wondering if its possible first. Thanks in advance, gonna go and checkout the forum more in the meantime.

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beenthere

· #2 · May 8, 2020

Don't see any pics.

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Curban

Discussion Starter · #3 · May 9, 2020

I guess I have to hit a 20 post count before I'm allowed to post pics. Will edit and add them again once I do. In the meantime any idea if I can also hook up the Ventilation Dehumidistat control to the Emerson Sensi Touch thermostat?

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Curban

Discussion Starter · #4 · May 9, 2020

OK, I just uploaded the 3 pics to my album, please click my album link in my mini profile to see the 3 pics i am referring to in the op.

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surferdude2

· #5 · May 9, 2020

I can't see the "C" terminal in the #3 picture but assuming it's there, I'd connect the available spare blue wire to it. Then disconnect the red wire from the "C" terminal at the stat and make it a spare. Then you can use the blue wire for the new stat and be in keeping with the standard color scheme of the industry.

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beenthere

· #6 · May 9, 2020

surferdude2 said:
I can't see the "C" terminal in the #3 picture but assuming it's there, I'd connect the available spare blue wire to it. Then disconnect the red wire from the "C" terminal at the stat and make it a spare. Then you can use the blue wire for the new stat and be in keeping with the standard color scheme of the industry.

C terminal is to the left of the G terminal.

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beenthere

· #7 · May 9, 2020

Not as far as I know. It doesn't have terminals to connect other devices to it.

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Curban

Discussion Starter · #8 · May 11, 2020

Thanks will double check the hookups and probably use the blue wire for the C. Anyone have any experience with the Emerson Sensi thermostat? Can you hook up the dehumidistat control to it as well? Was hoping to find a smart thermostat that i can do this to to eliminate that extra control.

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surferdude2

· #9 · May 13, 2020

Curban said:
Thanks will double check the hookups and probably use the blue wire for the C. Anyone have any experience with the Emerson Sensi thermostat? Can you hook up the dehumidistat control to it as well? Was hoping to find a smart thermostat that i can do this to to eliminate that extra control.

I'd think that it would be possible to control a dehumidifier with any smart thermostat that is listed to control a humidifier. It won't be able to do it without some help from you though. You would need to supply a control relay to be able to turn the line voltage dehumidifier on and off with the control signal from the thermostat.

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