Wall mounted thermostat
Can the non-ducted Coleman Mach roof mounted air conditioners with the manual knobs be converted to a wall thermostat system? I like the quiet when the AC cycles instead of the steady fan noise.
Forum Discussion
- Yes but it is a lot of work. I did it to mine years ago and don't think I would ever bother with it again
- Another option is to rewire the fan...
If you look inside the cover for you unit you'll see a schematic like the one above.
For the unit above, if I wanted the fan to only run while the compressor was on I would disconnect the white wire coming from the thermostat and connect the fan to the yellow wire going to the compressor. This can likely be done at the capacitor, the fan compressor caps are close to each other under the roof top cover.
This will make the fan cycle on and off along with the compressor.
This will diminish the efficiency of your unit, and could lead to icing of the coils when the ambient temperature is close to the thermostat temperature (for example at night time.) - 1. Install a Ducted AC inside plenum
2. Purchase a Wall tstat and Upper wall tstat control board kit
3. You will have to run a 6 to 8 wire standard AC wire cable from the AC unit to the area on the wall inside the motorhome where you want the Tstat to sense the interior air. You will also have to run a Ground and Positive 12 volt source to either the Roof AC or the wall tstat to power the system. Doug
