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Old 01-18-2011, 12:08 PM   #1
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furnace qs

hey guys and gals ive hooked up my furnace,it has 4 wires coming out of it,2 blue for the thermostat and a red for + and yellow for -.So thats what i did odd that the thermo has 2 blues and has a black and white coming out of it.Anyways hooked it up and nuthin.Think I should turn the thermostat wirea around will that make a diff? Also do you fuse your furnace? 12v...On the bright side the fridge is working fine so I can sit by the fire and drink beer if it all goes to hell!Do you guys fuse yer fridge from the battery? cant have that failing...... anybody know if these have fuses in them? This is a typical rv furnace,i think suburban
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Old 01-18-2011, 03:22 PM   #2
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Re: furnace qs

You need to look at your installation instructions. My suburban is really old. Probably almost as old as my 30+ year old RV. So I'm not sure if this will help you. If not let me know and I will find the troubleshooting links for the suburban furnaces that I have booked maked on the computer.


From my furnace. I have two blue wires, a red, a yellow. One of the blue wires comes out of the same connection as the red wire.
The blue wire that comes out with the red wire is connected the lightweight wire (red) which goes to the mechanical thermostat (yellow wire at top left hand side of thermostat in pic). The other blue wire goes to the white wire that runs to the thermostat (ground screw at bottom left hand side of thermostat pic). The red wire goes to the blue RV 12vDC (+) wire and the yellow wire goes to the white RV 12vDC (-)

I have a White-Rodger brand thermostat that is a Heat Only mechanical thermostat (I think I bought the thermostat in GA at Home Depot but not sure). We did replace the older thermostat because it wasn't working right.






Our furnace was working great until we headed down to TX (Nov 2009) I blew a rear outside tire (I have rear duallys on the Class C) that was under the furnace. Got the tire fixed and headed on down the road. Got to TX and the furnace wasn't working. We halfheartedly fiddled with it over that winter but really wasn't that into getting it fixed because the electric heat was cheaper than the propane. Once we got back to NM, we tore into the furnace (pulled it completely out of the RV). I was in need of a good cleaning so we did that. Turned out the flat tire beat the wheel well that the furnace sits on hard enough to beat rust that was inside the tubing loose and the little flecks of rust was blocking the orifice to the burner. The furnace would try to light but it would go right back out. Now it works great again. But we only use it as a back up to the electric heater since our electric is included in our site rental.
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Old 01-18-2011, 04:30 PM   #3
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Re: furnace qs

I was able to find a manual for my old furnace after a bit of searching.

If your furnace is like mine, 2 wires will come from a photoelectric eye that generates a voltage when the pilot light is lit. One side voltage is sent to the thermostat which switches it on/ off according to the temperature setting. The other wire from the PE eye goes to the gas valve. When the circuit is complete, the gas valve opens and the furnace heats.

The other wires may be for a manual "fan only" switch. Mine doesnt have that, but does have a 12VDC/120VAC selector for the fan power.
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Old 01-18-2011, 04:49 PM   #4
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Re: furnace qs

I have a thermocouple. IF it was replaced when a previous owner replaced the AC unit, then my furnace could be as new as 1984. When I said my furnace is old, I really meant it!


http://bryantrv.com/docs.html Lots of old manuals for RV appliances, heaters, etc.
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Old 01-19-2011, 12:34 AM   #5
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Re: furnace qs

thanks very much gang i can hear it clicking down there when i turn on the stat but nuthin else. besides the neg(yellow) and +(RED) only 2 blus and they are both headin to the thermostat.Ill muck about tomorrow and if nuthin i guess ill pull it out.argh! Im gonna look for my manual online
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Old 01-19-2011, 08:45 PM   #6
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Re: furnace qs

So you hear it sparking but no ignition? Did you have it working? What has happened since it was last operating? Have you pulled the burner tube out and cleaned it ? Getting it back in is a PITA as you have to turn it about a quarter turn or so just right and the straighten it back up just to get it replaced. Have you cleaned the contacts? What does your igniter look like?


When you trip the thermostat, the blower kicks on. Then the sparking (clicking) starts. It should be a very rapid ticking sound. The ticking stops and then the blower shuts down. Is that what's happening?

Let me know. Tomorrow (when it's daylight) I can take some pics and post them on my photobucket page and pm you thru here if you want.

Most of the time it's mostly cleaning. We have cleaned our burner/igniter every fall before having to crank it up. I generally clean out a dead spider or wasp. I can take pics and post them on how we clean it.
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Old 01-20-2011, 01:29 AM   #7
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Re: furnace qs

no sparking just a click down ther im gonna pull it out again and have a look ill post pics you knoe how it goes worked when opulled..i want this type heater cause it draws fresh air in and exhaust outside as you know my bus is full of wood so besides electric i dont want to run unvented heat.pull,service,make good reinstall.thanx!
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Old 01-20-2011, 06:15 AM   #8
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Re: furnace qs

Since no one has answered the 12v question, yes you should fuse them. More or less everything should be fused. It's better to blow a fuse than see your appliance let the smoke out and quit working, or your whole bus go up in flames.
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Old 01-20-2011, 07:01 AM   #9
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Re: furnace qs

Is your system lit by a pilot light, or a spark ignitor?
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Old 01-20-2011, 11:49 AM   #10
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Re: furnace qs

Spark Ignitor on mine. You may need to clean your spark ignitor if you have one. A light sanding is all you need (I use a 220 fine Sandpaper or the fine side of a nail file). Do not try to force the contacts closer together. Lightly sand the exterior connections to the ignitor as well. If spark, make sure the ceramic isn't cracked. Next thing pull your burner tube out and Use a straightened paper clip or similar thin wire to clean out the little honeycomb metal in the burner. Tap it gently on a hard surface and then dump the junk out the rear of the tube. Replce and try again. If that doesn't work, then you need to pull your furnace. Remove the gas pipe (wraps from the side around to the back) make sure the tube is emptied of junk. Check the orifice the tube hooks into at the rear of the furnace. make sure it is clean and no rust. While you have it pulled out, get one of those swiffer duster things and dust the interior of the burn chamber. Dusting will brush any soot that may have accumulated along with any little buggy carcasses. Make sure the gas lines are all free of debris and put back together. re install and try again. It may take 3 or 4 tries to get all the air out of the lines and the LP flowing good. If still no go... then you may have a bad circuit board (you can take a peek at the the board while the furnace is pulled out. It is on the side where the gas line enters the furnace. We popped ours out and flipped it over to look to see if there was any cracks or "hot" spots on the board.

Pics will be here when I get them up
http://s570.photobucket.com/albums/s...nske/Our%20RV/
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