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

    Nov 2, 2009, 02:12 PM
    Thermostat installation Honeywell RTH221B
    I bought a Honeywell RTH221B Thermostat to replace my the old 50's thermostat in my parents house. When I disconnected the old one, there were only two wires, not color-coded and no letters or number or anything on the device itself where each wire was connected. Where do these two wires connect on the new thermostat - my choices are Y or G on the left side, or Rh, Rc or W on the right side. There is already a tiny connector between Rh and Rc.
    medic-dan's Avatar
    medic-dan Posts: 321, Reputation: 23
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    #2

    Nov 2, 2009, 02:44 PM

    Assuming it is a heat only system, it should be R and W on the old thermostat. Leave the connector on and connect to either Rc or Rh and W. Polarity does not matter, its AC powered.
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