Heater question- 2002 Flagstaff Tent Trailer

[JLBL]

Hello-I purchased a used 2002 Tent Trailer, so trying to learn how the system works. We have an internal heater which I believe is running off propane, but when the 12V battery was low last weekend, it would not operate.

Does anyone know if the heater runs off both 12v and propane?
thanks

[flyrotor]

The heater runs off of propane, the warm air is dispursed with an electric fan. The chamber where the propane burns gets hot, the fan blows cool air across the chamber and via convection heats the air, in turn cools the chamber and prevents it from overheating. As a safety feature, there are sail switches to identify adequate ventilation across the heating chamber, as the battery becomes weak, the fan does not produce enough air flow to open the sail switch, and therefore shuts off the burner. It is a preventative feature to prevent overheating, damage and/or fire.

[JLBL]

Thank you very much! That is very helpful.

[NWJeeper]

Furnace will fail to work at 10.4 volts. This is really really low voltage and not good on your batteries. They should never get this low. You should think about upgrading your batteries if this is common occurrence. Furnaces are one of the biggest power hogs on an RV using around 7 amps when running and can drain a single battery overnight if outside temperatures are cold. Think about getting some good down comforters and more blankets and keep the furnace use to a minimum.