Help with digital thermostat.
I have been fighting with what should be a fairly simple swap, I am swapping my Coleman Mach thermostat for a Honeywell TH6110D1013 which is a battery operated thermostat. I am attaching a picture o...
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When I did this mod, I had to connect ground to "R" instead of power. Apparently in my trailer (not sure about all), the furnace and AC is activated by ground instead of power. I figured this out by trying to activate the furnace manually with power, and it didn't work. When I shorted it to ground, it turned on.
Normally you would think that you would connect positive power to the power lead, but since we don't have 24V in our RVs, we're running off the backup batteries. When turning on a furnace or AC, it would normally direct that power to the furnace through a relay or transistor. But since my trailer activates with ground, I had to connect it to ground.
My notes are at http://www.modmyrv.com/2012/01/03/mod-100-honeywell-digital-thermostat (user "wishbone" in the comments)
Normally you would think that you would connect positive power to the power lead, but since we don't have 24V in our RVs, we're running off the backup batteries. When turning on a furnace or AC, it would normally direct that power to the furnace through a relay or transistor. But since my trailer activates with ground, I had to connect it to ground.
My notes are at http://www.modmyrv.com/2012/01/03/mod-100-honeywell-digital-thermostat (user "wishbone" in the comments)
