what dealer did your walkthrough/PDI?
that's a basic thing for them to explain to new owners. if they didn't go over that with you, who knows what else they didn't tell you!
yes, the furnace is propane-only. the fan and lighting the pilot requires 12v power from the battery.
before you run anything on the propane, light the stove and let the burners burn all the air out of lines.
then you'll have no problems with the furnace, oven, water heater or fridge running on the propane.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity