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    gwong8's Avatar
    gwong8 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 7, 2006, 10:23 PM
    Replacing thermostat
    I am trying to change out my old thermostat which uses a mercury switch to a Honeywell ct2800 programmable thermostat. The old thermostat which is also a Honeywell has just 2 wires connected to it and none of the terminal posts got any letter markings. There is no instructions on the ct2800 on changing out a thermostat with 2 wires. Can anyone tell me which terminals to connect the 2 wires to? I connected the 2 wires to terminal W & G but it didn't work so I disconnected it and used my ohmmeter across remaining terminals to see which terminals gives me a short as I turn temperature 10 degrees above room temperature. None of the terminals went from open to short as the temperature was increase 10 degrees above room temperature.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #2

    Dec 8, 2006, 11:02 AM
    R and W is all you need, it doesn't matter which wire is where.
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