Originally Posted by luv2drum
Does the Coleman Mach digital model allow the fan of the a/c to run all the time, even when the furnace or heat mode is on?
The Coleman Mach digital thermostat is a good thermostat, accurate and easy to install but would not allow you to run the A/C fan without the air conditioner being on.
However, a little custom wiring could make this happen. On this forum in the manuals section is a file showing the wiring of Coleman (Airexcel) thermostats. My non-professional reading of that information tells me that if the red wire is connected to the gray wire (through a switch) you could run the heater (using the thermostat) and the A/C fan by itself through a special switch. You could use any sort of switch you want to - one that matches what you have now in your trailer, or even a regular 115 volt light switch (note: the switch will only be turning on or off 12v DC current from the red wire to the gray wire, making the low A/C fan blow)
If anyone who is expert in this area has another thought, please add to or correct my idea (that might have been borrowed from someone else)
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch