I actually thought it odd there was no way to run the furnace fan in an RV without burning propane myself.
I installed a 2 position switch in the convenience center with all the other switches. This one, in position 1 is closed on one set of contacts and open on the other set. When switched to position 2 it is opposite. So in position one the fan works as designed with the furnace. When in position two I have a fuse 12v wire directly to the fan and the other open contacts keep it from back feeding Power to the board.
I can now run the furnace fan, sit a forced air electric heater in front of the air return and heat the belly.
Of my 3 tanks, 2gray and one black, the galley gray dump valve is exposed, so that will freeze. Otherwise I can go to 10 degrees above.
I do also run a couple others as well. I do however run this exclusively when it’s parks in the shed plugged in to prolong winterizing just in case that one nice weekend or two pops up before Christmas.
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2016 Keystone Sprinter 298FWRLS
2021 Ram 3500 DRW CC LB HO Aisin 4.10 50 gal.
Anderson 5th wheel hitch
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