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Old 05-16-2015, 05:09 PM   #1
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Join Date: May 2015
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Duo therm / 10 wire digital thermostat upgrade help

We purchased our Monaco Dynasty 2 yrs ago. We have done lots of exterior upgrades and love our rig. There is one issue the temperature swing for cooling the I side is terrible. I called dometic and they sold me new thermostats with new control boxes, I got them and seamed to be wrong after inspecting, so I called them back and told me the units they sold me will not work and the only way to do digital thermostats was to purchase new roof units. I have surched many forums and asking for any help I can get on upgrades, I have a 10 wire ribbon cable along with the 2 furnace wires and power wires. Has anyone done this upgrade with this kind of wiring ? Any help would be very appreciated the other links show 6 and 7 wire but not 10.
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Old 05-17-2015, 08:59 AM   #2
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Location: West Palm Beach, FL. USA
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A temperature swing problem comes from two things:
1. Location of the sensor(s)
2. A built in "swing" threshold of more than plus/minus one degree

Most RV t-stats won't call for more cooling until the temperature changes by more than one degree, which gives a slightly more than two degree total swing. Coupled with typical RV sensor location(s), this is often uncomfortable. Sometimes fixing the location is easier and more effective than changing the t-stat.

If mounted on an exterior wall, try insulating the t-stat from the wall with a piece of 1" thick foam board. Also check for air currents around it - too often the t-stat is cooled/heated by air currents from a nearby duct, stovetop, etc.

What year Dynasty is it? And what model Dometics a/c (or heat pump)? That can make a difference if you want to substitute a different t-stat.
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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Old 05-18-2015, 07:37 AM   #3
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It is a 94 Monaco Dynasty, they are the original Dometic Duotherms
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thermostat, upgrade

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