Question about Honeywell Programmable Thermostat Heater

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Replace three wire thermostat with four wire thermostat

Hi
I have electric baseboard heating and I am trying to replace my thermostat. The baseboards are always cranking out heat even when the thermostat is turned all the way down, and I am assuming it is the thermostat that is broken.
Anyway...I just purchased a Honeywell CT410A
http://customer.honeywell.com/techlit/pdf/67-0000s/67-5169.pdf.
My problem is that when i took off my old thermostat is has three wires which appear to be red, black (maybe blue) and yellow (the wires are very old so the colors are faded).
The new thermostat i purchased has four wires, two sets of red and two sets of black.
can someone please explain to me how to hook the new four wire thermostat up the the three wires I have coming out of my wall?
thank you!!

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From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.

Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.

Posted on Jan 26, 2009

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Posted on Jan 02, 2017

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