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    AmyCGoose Posts: 5, Reputation: 1
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    Feb 21, 2010, 08:17 AM
    8 wire thermostat O and B wire
    I am trying to replace my old thermostat with a Honeywell RTH7500. My old wiring is as follows.
    C-blue wire
    G-green wire
    R-red wire
    W2-white wire
    O-orange wire
    B-black wire
    Y-yellow wire
    E-brown wire
    Everything matches up to the new Honeywell just fine except for the O and B. On the new thermostat, I still have an O/B terminal and an L terminal available (as well as the RC which is currently connected to R with a jumper).
    The manual says "If your old thermostat has seperate O and B wires, attach the B wire to the C terminal. If another wire is attached to the C terminal, stop now and contact a qualified contractor." An account that I read online said to connect O to O/B and tape off B. Any other suggestions?

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