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    larryprice Posts: 1, Reputation: 1
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    Jan 23, 2011, 01:38 PM
    Help me wire a RTH7400/7500 to a Honewell to a T8411R
    I am replacing a worn out Honeywell T8411R (non-programmable) Thermostat with a new Honeywell RTH7400/7500 7-day programmable thermostat ( Unit is a Trane Heatpump with Emergency/auxiliary heat. Of course I am having troubled

    Can you help? I matched up all wire by Letter to new but I have an Orange, White and Black wires that aI am not sure where hey go...

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