I maintain Air Supply Houses at a local car plant and have little/no residential experience. My uncle installed a funace at his hunting cabin and it doesn't run right. Of course I was called to save the day, and I failed. Danged thing has me baffled.
It is an LP Comfort Maker GUA. Way to big for his 500 square foot shack, 64k btu's. It was going out on high temp. I had him put some more openings in the supply. This helped out a some as it does not drop out all the time. I turned the "fan on" limit way down, but that forces the "fan off" limit so low that it will never shut off. The over temp is set up all the way. I also tried regulating the gas way down, figuring the fan would have enough time to keep the exchanger cool, but that did not work.
I conceeded defeat and he did have a residential guy out there to look at it and he could not figure it out either. I figured the fan limit was bad and had the guy replaced it. The original fan limit and the replacement have a max of 200 degrees for the high temp shut off. Is this the correct one for the unit?
Does anyone have a manual or diagrams for these units?
One last note, at work, I can access the roof tops from a PC. I can see all the sensors, troubles, damper positions, etc without having to leave the desk. LOL. No wonder I am lost!
Thanks for the help!