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Thread: Wire id

  1. #1
    Junior Member

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    Wire id

    Can anyone tell me what the green wire is and where it would go on a new thermostat. This is an old white Rodgers heat only 2 wire thermostat. Itís on an old hot water boiler. Thanks

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  2. #2
    Junior Member

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    We ended up putting a nest e on the system. The old thermo was a 1f35-910 and when I called best they told me to abandon the wire going to y6. Does this sound right.

  3. #3

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    The green wire is typically used to control a fan in HVAC applications. You need to check the the other end of the wire to see if the green wire is connected to anything.

  4. #4
    Senior Member

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    Some of those old thermostats used the 6 as a inverse heat to close a zone valve in a hot water system. Modern valves are spring loaded so they close when power is removed and don't need a 6. Older valves needed the 6 to "power close" them after the thermostat said heating was satisfied.

    So you really do need to check to see where the wires go.

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