Hello Ohio !
I'd either repost these questions in the TT FORUM Expandables, Hybrids, & Lightweights Discussion - iRV2 Forums
or ask a Moddie to do it for me. Janet has been very helpfull to me. iRV2 Forums - View Profile: Janet H
just click the word Messages under her picture and then send a PM with your request. You'll get a lot more answers over there. I do know that the furnace is stand alone and doesn't interface with the overhead ducts at all. When you turn it on you should be able tohear the burner start and shortly after hear the fan kick in. Look for a register or round louvered duct at or near floor level for the air delivery. While it's running go outside and feel the exhaust from the round hole (about 2" in diameter) in the cover it should be HOT, don't touch it just feel the air. If it's not hot the fan may not come on and that leads to LP Gas delivery problems which again the other Forum will be very helpfull solving.
I looked it up on line and what a really nice hybrid. Well done. It's not unusual for a few little things to go south after sitting and not being used for a period of time. So the only answer is to use it often and ENJOY.
Ohio Boy here, Springfield born and raised, now living in Albuquerque.