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- Thermostats
- C wire hook up on the TACO box

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2 weeks ago

I have an existing thermostat running on two wires with batteries and I want to replace it with a nest thermostat that requires a C wire. I do have a third wire available to me I just need to know where to hook it up on the TACO Box

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1 ACCEPTED SOLUTION

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2 weeks ago

64 REPLIES 64

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2 weeks ago

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2 weeks ago

Thank you I'll pull the cover off and check which model I have but I think that answers my question

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Monday

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Monday

Please upload pictures of your setup

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Monday

I called TACO in Rhode island and Steve in Tech Support walked me right thru it.

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Monday

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Monday

Connected directly to the white wire on the transformer or follow the white wire off the transformer

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Monday

connected directly to the white wire on the transformer. It is a 24V transformer, correct?

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Monday

**when I measure r to w=26**

**R to C =26**

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Monday

Ok good, you should be all set. Go ahead and install your Nest, let me know if any issue.

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Monday

Thanks again I really appreciate the help 👍👍

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Monday

Anytime. Please mark the answer as a solution when you get a chance.

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Monday

Yea I'm at a total Lost. At thermostat R to w =26v

R to C =26v

Nest says lost voltage on c🤔

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Monday

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Monday

I will double check I have R.W and C hooked up on the thermostat. I will double check settings

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Monday

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Monday

How is it looking?

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Monday

Call TACO, they are really helpful

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Monday

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Monday

this comes off the transformer I have 19 volts here but I have 24 across the transformer

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Monday

you just click on the picture icon available in the textbox when you reply

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Monday

Ok good luck

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Monday

You can also access your wiring diagram from the google home app in the thermostat settings.

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yesterday

Set the thermostat up but for some reason it's still not seeing the C wire