Well I did manage to replace the stock Coleman-Mach thermostat with a $79 full-featured digital touch screen unit from Home Depot. The slide switch on the Coleman was getting more & more flaky, and my warranty was gone. To avoid spending $150-300 for another featureless stock Coleman, I was highly motivated to figure how to adapt a digital setback model. This job took me many, many hours to figure out the wiring. I had to measure voltage swings on all the wires, in all the different conditions, break down and understand the schematics of the heat pump unit, the Coleman stat, an the RiteTemp schematics. I sure didn't want to blow out the control circuits or bypass the delay function that protects the compressors.
I found that a RiteTemp Model 8085C for a dual stage heat pump with control for auxiliary heat strips fit the bill. It is battery operated and has floating contact closures to control the heat pump unit and kick in the gas furnace if the heat pump can't keep up or if you set the temp more than 4 deg warmer than ambient. It doesn't have the 2 speed fan switch so you wire it for hi speed only, but the Winnie Energy Management System will still cut the speed to low to save power on 20 or 30 amp service.
It has some really great features:
---It records the number of hours of actual furnace run time and will notify you to clean/replace the filters when it hits the hrs you preset.
---You set the swing temp for up or down to get the cycling time that suits you & your coach conditions.
---You can off-set the temp reading to be calibrated to a more accurate temp somewhere else (like next to your favorite chair).
---Backlite touch screen with very large numbers and very intuitive to use.
---Measures humidity and can set a limit to control a humidifier if you really need one.
---It comes programmed with an "Energy-Star"¯ program which works great for us. But if you want, it has 4 program periods/day on Program A, and 2 or 6 periods/day on program B.
---If the coach is too hot/cold, just tap the display up/down a few degrees to override program.
I have a hand sketch of the wiring that is working in my '04 Winnie coach, but I would have to clean it up so it could be used to show exactly what wire goes where. I'm thinking a drawing that shows existing Coleman stat terminal connections crossed over to new RiteTemp terminals is all that is needed. I believe all the Winnie's with basement AC/Heat pump use the same Coleman thermostat for many years. It'll take me a few days to pull all the info together to publish here. Also I don't know how to upload a pdf to the forum when I have a schematic ready. If someone could PM the info to me that would be helpful.
This link will take you to the RiteTemp website where you can download the Installation Guide and Operation Guide:
Here's the 29 page application guide:
Download Professional Application Guide
Bill (Dune'r), Helen & Missy (our toy poddle)
Last of the Chieftains, 2004 39T, W22, Banks Headers, Koni's, Safe-T-Plus, SMI brake
2013 Lincoln MKZ Hybrid towed 4-down