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I've replaced my very old (mercury) Honeywell thermostat with a new one (round, Model: YCT87K1011), but I can't get it to control the temperature. If I connect the two wires one way, the furnace comes on but won't shut off. If I reverse the wires, the furnace doesn't come on at all. I've actually tried two of these replacement thermostats with the same results. Any suggestions? John

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  • jharyyz Nov 06, 2008

    ***** -- thanks! But I'm not sure what you mean by "heat anticipator" -- the two switches on the back of the unit? I've set them as recommended for a gas boiler.

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Hey John, man that ole T87 has been around for a hundred years and I have installed many of them, but I cant remember the letters on the wiring. Seems to me that it is R-W-Y, any way you will use the R and W. I have a t87 at home still in the box and I could wait till I got home to help you but Im sure its the R and W terminal. Dont forget to set the heat anticipator. Set it the same as the current value of your gas or oil valve.

Posted on Nov 06, 2008

  • butch welch Nov 06, 2008

    You did good. I am positive (100%) that you connect your wires on R and W terminals on the subase.

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