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Which of the Weil-McLain EG-65 transformer terminal should I use for a thermostat common wire? (I am trying to connect a nest learning thermostat to that boiler and it needs a common wire). Thanks.

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According to the control wiring supplement for your boiler, there should be a C terminal on the transformer, adjacent to the R terminal. Look for the terminal on the transformer with the green wires going to it.

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