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How Does A Gas Furnace Work
QUESTION:Does anybody know exactly how a LP gas furnace is supposed to work in a class C motor home?
I am trying to get my furnace to stop blowing cold air
ANSWER: I seriously doubt that it is the heat anticipator needs adjustment. Most of those units made after the early 80s are sealed combustion with direct spark or intermittent pilot ignition. Most of them have an ignition sequence that starts the blower motor and the draft induction motor at the same time. This means that the blower motor is running before your main burner is running (blowing cold air). Im not sure from your question if it starts blowing warm air later, or if it is not blowing warm air at all.
Do you get warm air eventually, or does it just blow cold?
Edit:
Ok, if it never blows warm, youre going to need some serious trouble shooting. On the intermittent pilot models the most common problem is pilot orifice getting plugged. On these units a small electronic spark igniter lights a pilot light that only runs when there is a call for heat. The pilot orifice gets plugged and the flame sensor will not allow the main burner valve to open. On the direct ignition models, the most common problem is the flame sensor itself. Keep in mind, I said in most common problem; it could in fact be a number of other things. Problem with these units is that they are built so compact that they are a pain in the butt to work on, and for this reason most HVAC techs dont want to touch them. Parts are very specific as well, so your best bet is to call around to Camper dealerships that have a good tech on the staff (very hard to find). As I said before these are sealed combustion units and you should really not tear into this unless you really know what you are doing.
If you need help finding someone, feel free to email me with your location. I know a few good techs around the country that might be near your location.
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