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    Findlay45840 Posts: 1, Reputation: 1
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    #1

    Nov 15, 2012, 09:35 AM
    My system has a very simple three (3) wire control circuit. White, Red & Gr system.
    I would like to install a Honeywell RTH7500D on an old HVAC system with three wire control wiring [W,R,G].

    Will it work OK?

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