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Thread: carrier to Nest

  1. #1
    Junior Member

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    carrier to Nest

    I have an old carrier programable thermostat and am trying to replace it with a 3rd gen NEST. There are two wires that have me confused. They are labeled S1 and S2. I think they connect an outside temp sensor, but am not sure what to do with them when the new thermostat is installed. Help!

  2. #2
    Administrator

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    You can cap them off and not connect them to the nest. Your existing thermostat most likely you the outdoor sensor to display the outdoor temp and or prevent the unit from running when the outdoor air temp was low.



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