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    ermal3k's Avatar
    ermal3k Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 12, 2011, 11:29 AM
    Honeywell thermostat replacement. Wiring question.
    Hello

    Looking to replace the old Honeywell thermostat to another unit that is programmable. I have a gas boiler with water baseboard. No labels on the 2 wires on thermostat end. But on the boiler end I see 3 wires instead of 2 and they are labeled 1, 2 and 3. Any idea which is what in now days terms? The house is 18 years old and it has 3 zones (one per each floor). At the boiler all wiring color are connected to the respective numbers.

    Thank you
    Ermal G
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Dec 12, 2011, 05:55 PM
    If there are only two wires at the old thermostat, don't worry about the ones on the boiler. Just hook one of the old wires to r (or rh) and the other to w on the new stat and you should be all set.
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