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how to connect nest

  1. Two wires same slot in W2

    I currently have a Trane Model number TWE031E13FB1 and an Aprilaire thermostat 8366. I recently purchased a NEST and installed however, there are two wires, black and white that are in the W2 slot I can’t connect two wires in the nest in the same slot. How do I connect them in the NEST. I tried...