I've got my annual Dukuth Hockey tourney coming up and invented a few folks to bunk at my place. So that means I'll need heat while parked.
I have a 25k BTU duotherm furnace. It has outlets on the sides and bottom. Looks like I can configure it.
I don't want to put holes in the side, so I'm thinking Bay mounting. The trick is, the air return on this is made to be inside.
If it ever stops raining I hope to do some test installs. Until then what's everyone been doing ?
In the shop installing the pulse air wiper kit, King cruise control, and electric sun visors. Almost done. Next up is manual leveling system for campsites.
You MUST have outside venting for a propane furnace. Suburban has the smallest vent. Good Luck, TomC
Yeah, that's the plan. I'd hoping to make a small hole in the floor of the bay, and run the exhaust into a bent pipe out the side.
neoneddy
You need a vent into the bus to get return air and DO NOT restrict the 3 outlets. The furnace will over heat if not enough air flow. You need fresh air into the burner as well as the exhaust outside.
Most propane heaters have two pipes; one for combustion air (in) and one for exhaust (out). The exhaust side will get HOT.
Gordie
I mean't the three outlets for heating the coach. Yes there is only two for the intake and exhaust pipes.
I installed it yesterday.
I cut 2 holes into the main OTR Air ducts with an adjustable elbow angling it up.
Then I positioned the furnace next to the wood access door for the OTR heater core, I marked both the door and the furnace. I then cut a hole in the door and the side of the furnace for the air return. As I understand it, I'm pulling air from the stock OTR air returns and pushing hot air out the OTR vents. So far so good. I used some spray adhesive and foam to insulate and seal the return connection (just flush / butt mounted).
I then duct taped over the original air return grate and installed the factory cover to seal it up.
First, I plugged in my CO detector, right above the floor vent.
I fired it up and within a few minutes saw the thermostat indicated temp rising, from 44 to 45 ... then eventually 46, but I started to notice it getting a bit hazy inside. I've read this can be normal for first operation in a long while or new furnace. I had tipping the furnace every which way getting it in and drilling holes, sounds like it could just be burning off some saw dust from the hole I cut.
My more serious issue is the flame inside the burner is blue all the way around except in one side (of 3 main runners) is yellow. It initially didn't worry me, but I'm also noticing black soot in the exhaust. So today I'll be pulling it out and taking a look a the burner.
Yellow flame means not enough combustion air for the burner. Make sure the burner vents are open enough to get blue flame.
What did you do to provide for combustion air intake and for exhaust output? Could the combustion intake be too long or have too many bends which act as a restriction?
I did no extra piping for intake combustion intake. I figured the bay isn't air tight, it will breather fine. During this test I had both bay doors open, I don't believe intake restriction was an issue from there, it could be restricted internally however.
Ok did a tear down and compressed air cleaned out of the burner assembly. It fired up nicely , no soot.
It's not nearly big enough to properly heat the coach but it's fine for our needs. It was in the 30s and kept it at 63 for a few hours. If I supplement with an electric heater I can keep raising the temp, but I think we'll be fine for late and early season use.