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

    Dec 28, 2008, 07:50 PM
    RTH221B wiring with only yellow and green wires
    I have an old Honeywell thermostat (rotary type). There are two wires, what seems to be green and maybe offwhite/yellow. They're coming off a late 1940s gas furnace with fan blower. I wired the yellow and green wires to the yellow and green terminals and the furnace and fan came on and never shut off. I had to disassemble the unit to shut it off.

    Is there another wiring possibility? I programmed the unit before I stuck it on the mounted base, could that have done anything?

    This is my Mom's home in north Jersey, so there's no AC.

    Thanks for any help!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 28, 2008, 09:51 PM
    Use W and RH for the terminals. It does not make a difference which wire goes where since there are only 2 wires.

    See wiring 2.3 first picture right side

    http://customer.honeywell.com/techli...69-2060EFS.pdf
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