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Nest thermostats are designed to work with most 2-wire 20 - 30V systems. You need to check what the color of the wire is for before you connect it on your Nest Learning Thermostat. We recommend using our Compatibility Checker tool on this link to verify if your system is compatible: https://support.google.com/googlenest/answer/9246656
Sorry, there was a problem. Please try again later.The orange wire would go in the O/B terminal. The black I’m not to sure about. It would either go in the * terminal or the C terminal. Hope this helps!
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