Adjusting burner on upright furnace

[Jabba]

When I fired our upright type furnace up it worked fairly well, much to my amazement and satisfaction. I let a big sigh out when I didn't torch the rig firing it up. Problem is the burner furthest from the inlet seems to be burning with too much oxygen (tall yellow flames). Does anyone know how to clean or adjust one of these?

[WayWard Wind]

I don't understand what you mean by your " upright furnace ". If a burner is burning yellow, it's usually a sign of not enough oxygen, however if you have just started it up, it could also be a spider web in the venturi ( burner tube ). You should probably take the burner out & look at the inside of the burner tube or if it's big enough, run a small brush thru it. Spider webs sometimes can be hard to remove. Hope this helps.
Best,

[thenewkid64]

Based on the symptom you describe here and in another thread regarding the fridge I wonder if you are experiencing low LP Pressure? Have you tested it lately? 11 IWC is what I belive you need to have in the system. Without sufficent pressure some appliances will not work. I would start there prior to adjusting / troubleshooting each appliance individually.

A yellow flame is a sign of too much?? Air in the mixture, there should be some but not alot.

[WayWard Wind]

oops!!! My mistake. I thought you were working on an "upright furnace" & not your fridge.
Best,

[Jabba]

I did find a good sized leak on a line yesterday, after trying stuff. This thread was for the furnace. I will try removing the burner assembly and blow it out and wirebrush it.