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

    Nov 8, 2007, 06:54 AM
    Honeywell mercury to a Honeywell programmable
    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 (one red and one grey)and none of the old terminal posts have 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 R & G then the Rc & G but it didn't work. It's a gas/boiler system. Thanks.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Nov 8, 2007, 07:20 AM
    Don't know about boiler systems, But do know red is common and white is heat.
    I would connect red to R, and gray to W.
    When set to Heat, and temperature is cool, a connection will be made.
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