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Originally Posted by Plantman
Don't have the literature, but it is heating and cooling. I'll pull it off the wall and check it out.
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Just count the number of wires connected to it. They are color coded, typically. The new thermostat will tell you the connection points for the various colors.
If they are not color coded (installed by a dork), you are in for some serious investigation to determine which wire goes where.
Also, if they are not color coded, DO NOT remove the wires from the thermostat without first getting the instructions for the present thermostat. If you do, you are FUBAR.