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After an answer on this site I purchased a new thermostat today capable of central heat/cool and also for a heat pump. It is the Honeywell RTH6400. I currently have a White Rodgers (9510E7) rectangular thermostat. I am still having problems figuring which wires go where. Currently there are 8...
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I am removing a old (1987) Honeywell Mercury THermostat Q472L Base that has W, R, Y, G, B, O. The RTH230B has Rc (which I assume to be B), Rh (which I assume to be R), Y (to Y), W(to W), G (to G). I have no idea what to do with the O (which I read could be the Changeover. Do I just tape it up... View more questions Search
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