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Thread: External transformer for power

  1. #1
    Junior Member

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    External transformer for power

    Does anyone in the forum have experience adding a separate transformer to power the nest thermostat? Do you just connect one side to the c terminal and let the other side float or do you need to add the other-side to the Rh terminal, so there would be two wires (I understand the Nest only allows one wire)? Any thoughts?

  2. #2

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    Lke a demo? You'll need a connection at Rh and C.

  3. #3
    Junior Member

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    Ok. The Nest only accepts one wire on the Rh. What do I do with the wire there now form the from the Aquastat (which is a Honeywell L8143E)?

  4. #4
    Junior Member

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    Figured out solution and do not need the external transformer.

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