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I have a rv duo therm thermostat and I am replacing with a Honeywell 2310 b model so what color wire goes to what terminal on the new one

It is a thermostat

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Depends on what colors the wires are Usually the red one is 24 volts , the black one is common. The green should be cool and the white should be heat

Posted on Mar 29, 2014

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I have an old mobile home that has and old duo therm thermostat that is acting up. keeps cycling off for quite awhile and on for not so long. I purchased a honeywell ct-31-a. It only has places for 4...


If you want just heat, connect the red wire to the R terminal, the White wire to the W terminal and the green wire to the G terminal. Confirm that these same wires go to the same terminals on the control in your furnace. If you want both heat and air conditioning, connect a jumper from R to R2. Keep the wires the same as I described and put the yellow wire on the Y terminal.

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You will have to have schematics from the old wiring diagram. Then you will have to confirm its consistency with actual old wiring before you can be sure that the wires run to the proper places on the old heater and a/c system. This sounds like a gas furnace and is simpler than a heatpump. Once you know what distinguishes the wires with the same color, you should label them and then you may call them a different color if they were wired with wrong wire colors. You may be in luck if you go to the furnace control box an look at the terminals.. They are usually labeled with a R for Red and W for white and Bl for Blue and B or Black. If you have other colors on these then it sounds that it was wired with wire spare wire by someone who knew what they were doing but neglected to leave a path for someone else follow.
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You may have to remove your filter & look for a model # of your unit, so we can pinpoint your wiring to the thermostat. Usually the terminals on the thermostats are labeled -RC-RH- etc, and you simply move old to new of the same. A lot of times some manufacturers will use phone cable form AC unit to thermostat, and mix up the colors, that's the reason for going to the AC and see what color is used from there. It could be red from control box, connected to green wire to thermostat for example. Thats where you note it and wire accordingly.(terminal calling for red wire, would now be green) If your stumped, get back to us with that model#.

Jul 12, 2008 | Dometic Rooftop RV Air Conditioner

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