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  1. johnlo23

    C-wire from AC in two transformer setup

    I have six wires going to my thermostat. Only five are used. I need to connect my Blue wire to Common 24V to power my new Honeywell RTH8580WF1007 Wifi thermostat. With the old thermostat, this is the wiring: First transformer, only two wires: Heat White - W Heat Red - Rh Second Transformer...
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