Atwood 8525 furnace overheating, gas pressure too high?
Hello Friends,
The Atwood 8525-III in my Bigfoot truck camper has been giving me issues since I purchased it a little over a year ago. Last fall, I replaced the control board with a dinosaur board and all was well.
Fast forward to now, and I'm having trouble getting the furnace to light (again). I begin checking everything and had read some about checking the propane orifice to make sure that was clear. Yesterday I took the gas valve assembly out, got the orifice out. Looked good but I cleaned it up anyway. Unfortunately, I also saw shiny brass screw on the side of the valve that I couldn't resist taking out to make sure all that was clean... it was like a carburetor jet, but when I removed the inner (plastic?) screw and I spring came out I realized I may have made a big mistake.
My problem this time ended up being the igniter electrode gapped too far. Fixed that and she fires right up, but now appears to be running too hot. I notice intense heat from the vents, and after a few minutes of running, the limit switch trips. After some research I believe that I increased the propane pressure and am turbocharging the unit...
My question now is, does anybody know the correct setting of the "jet screw" inside the valve? I understand that measuring the gas pressure would be the best, but I can't find the spec for the regulated pressure even if I could get a way do measure it. Or did this become an expensive lesson in not touching screws that you don't know what they do?
I'm a fairly competent DIY'er, but sometimes don't know when to stop. I'm feeling like I might be in a little over my head. Worst case, I think I should be able to replace the valve and hopefully fix everything. I just hate to replace a valve over one screw being out of adjustment. Diagnosis at the RV center will cost more than a new valve.
Thank you for reading. Any thoughts or advice are greatly appreciated!
The Atwood 8525-III in my Bigfoot truck camper has been giving me issues since I purchased it a little over a year ago. Last fall, I replaced the control board with a dinosaur board and all was well.
Fast forward to now, and I'm having trouble getting the furnace to light (again). I begin checking everything and had read some about checking the propane orifice to make sure that was clear. Yesterday I took the gas valve assembly out, got the orifice out. Looked good but I cleaned it up anyway. Unfortunately, I also saw shiny brass screw on the side of the valve that I couldn't resist taking out to make sure all that was clean... it was like a carburetor jet, but when I removed the inner (plastic?) screw and I spring came out I realized I may have made a big mistake.
My problem this time ended up being the igniter electrode gapped too far. Fixed that and she fires right up, but now appears to be running too hot. I notice intense heat from the vents, and after a few minutes of running, the limit switch trips. After some research I believe that I increased the propane pressure and am turbocharging the unit...
My question now is, does anybody know the correct setting of the "jet screw" inside the valve? I understand that measuring the gas pressure would be the best, but I can't find the spec for the regulated pressure even if I could get a way do measure it. Or did this become an expensive lesson in not touching screws that you don't know what they do?
I'm a fairly competent DIY'er, but sometimes don't know when to stop. I'm feeling like I might be in a little over my head. Worst case, I think I should be able to replace the valve and hopefully fix everything. I just hate to replace a valve over one screw being out of adjustment. Diagnosis at the RV center will cost more than a new valve.
Thank you for reading. Any thoughts or advice are greatly appreciated!
