MOD - Installing a digtal thermostat

The friendliest place on the web for anyone with an RV or an interest in RVing!
If you have answers, please help by responding to the unanswered posts.

Mopar1973Man

Well-known member
Joined
Jul 4, 2011
Posts
3,485
Location
New Meadows, Idaho
Hey Gang...

I'm going to install a digital thermostat in my RV. I was hoping someone could help me out with the wiring and verify what goes where. I've got a Atwood furnace and Coleman A/C unit. I've also got a Coleman Mach (?) thermostat currently. Give me a little bit I'll grab a pic or two of what I've currently got.
 
This might help!! It is for a Hunter Digital thermostat vs the Coleman. I believe the  2 fan speed control will be a bit different. There are other write-ups floating around the internet for this project too.

HTH
 

Attachments

  • hunter-digital-tstat-instructions.pdf
    71.2 KB · Views: 28
Well gang... I gone and done it. I got the Honeywell thermostat installed and all figured out. The first thing to suggest is to open up the access to both the furnace and the A/C unit and look at the wiring layout. Now I know with RV system there is no exact code they must hold to for color or labeling. So once I look at the furnace I saw a Red and White wire. So back at the thermostat I unhooked and touch them together and presto heater. Now also looking at the old thermostat the Red from the furnace was labeled +12V. Which it was a power lead so knowing this I place that lead to the R terminal on the new thermostat. The White wen to the W terminal. Now the A/C part was pretty easy. When I got the cover off I noticed right away the terminals where labeled already. But there is a catch the G is not just G its GL (lo fan - White) and GH (hi fan Green). So I used the GH lead in the G terminal of the thermostat the other GL lead I just taped up the end. The Y lead went to the Y terminal of the thermostat. Now there is a Blue wire (from the A/C) tied to Ground. Which I left and not used on the Honeywell thermostat but it was used on the Coleman for circuit ground.

But after turning on the DC and AC power again and testing. Wow! I got a good thermostat! No more waking up at night either freezing or frying from lack of heat or a runaway heater. As for that problem I did find that problem and could fix it. It a cracked solder joint on the circuit board so as you slide the temp slider up or down it either hooked up or didn't. But why fix it when I got better now!

Oh a better understanding of the terminal codes...
http://wiki.xtronics.com/index.php/Thermostat_signals_and_wiring
 

Attachments

  • DSCF5905-2.JPG
    DSCF5905-2.JPG
    166 KB · Views: 48
  • DSCF5906-2.JPG
    DSCF5906-2.JPG
    203.5 KB · Views: 31
  • DSCF5907-2.JPG
    DSCF5907-2.JPG
    209.7 KB · Views: 41
Back
Top Bottom