wiring of home thermostat


Old 09-23-08, 03:14 PM
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Unhappy wiring of home thermostat

I currently have a 859M room thermostat that controls the radiant heating for my living room. I want to replace it and chose the Honeywell RTH7500D programmable thermostat. I was following the directions, but when I exposed the wires from the old thermostat, I found only 2 - one red and one black. There are no labels on them or on the old thermostat that match the new one. Did I pick the wrong thermostat or can I still make this work?

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Old 09-23-08, 04:27 PM
Join Date: Oct 2002
Location: Hamilton County, Ohio
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Your wiring indicates that you have heat only - no air conditioning. The model you brought is for both.You could wire it using just the heat portion of the wiring, but a heat only model thermostat should save you some dollars and be easier to wire up.
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