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Replacement of Honeywell thermostat CT3200A

Can I replace it with RTH6400B. I have a high-efficiency furnace "Traingle Tubing" Prestige 250

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I can't find that model. The 3200A is (I think) a standard heat/ac unit. If the other unit is that type, you're okay. There are usually instructions with these stats for wire assignments.

Posted on Nov 13, 2008

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The manual is available on www.manualnguide.com

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1 Answer

I have a honeywell ct3200 with a trane xl 80 furnace. it will cycle on to the right temp, go off and cycle the furnace back on 30 seconds later. Is that normal? It is 32 degrees outside, set at 68


Hi, check page 22 in your manual, it says "Adjust the screws on the back of the thermostat as instructed on page 7." Your furnace is a 80% efficiency but is also a high efficiency 2 stage heating system so try adjusting screws A and B both ways and see which gives you the correct cycling.
Your manual is here:
http://customer.honeywell.com/techlit/pdf/69-0000s/69-0653.pdf

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Honeywell thermostat


If you have a forced air furnace with an air conditioner attached make sure you have a jumper wire between Rh and Rc. If the Bryant thermostat had a wire hooked up to C you do not want to hook this up to Rc. Just cap it off and put it back in the wall or disconnect that wire down in the furnace.

Aug 10, 2008 | Honeywell Programmable Thermostat Heater

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