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    roliemu's Avatar
    roliemu Posts: 1, Reputation: 1
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    #1

    Dec 2, 2011, 09:08 PM
    I'm replacing a 23 year old manual Honeywell thermostat with a new digital Honeywell
    I'm replacing a 23 year old manual Honeywell thermostat with a new digital Honeywell thermostat model RTH111. The old thermostat has two wires (colors white and red) but no designation on the terminals. This is for a hot water baseboard gas fired boiler.

    Which terminals do these unmarked wires connect to on the RTH111? The terminals are marked O/B, Y, RC, R, G, W

    Thanks,

    Roy
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Dec 2, 2011, 09:43 PM
    R and W,
    Turn off power/breaker,to boiler before installing, then back on


    Just wondering if the old honeywell still working, why change it
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