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Hi - Can I replace Honeywell T6360B thermostat with Honeywell DT90E? How do I wire it? T6360B is wired as follows: earth - uncovered wire 2 - grey 3 - black 4 - no wire 1 - brown DT90E has A, B and C only. What goes where? what do I do with spare wires? Or is this a no no...