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Don't know if you have resolved this issue, as it was posted in June. I have had a similar problem with an American Range where the oven would light Ok and checked out with correct pressure.
We had a call regarding soot in the oven and after a lot of investigation and several calls for the same issue, we found the flame jumping back to the jet (no air entrainment) and producing yellow flame and soot.
We observed the operation for some time and established that it only occurred when the door closed quickly.
I hope this helps, we feel it was a design problem as the range was new.

Pull the orifice and check it. I don’t know your model number but I’d expect to see a number 53 orifice in a range top.

When you cleaned the soot did you pull the burners? I’ve found if you don’t get it all in the first cleaning it can come back to haunt you.

Make sure your gas pressure is 10” dynamic. I know your pretty close right now and it might seem insignificant but even a .5” off for some LP commercial kitchen equipment can be problematic.

maybe it was never converted properly.

Have you checked the orifice hole size? You can easily gauge the orifice size with an orifice bit set. Maybe someone mistakenly drilled the orifice for natural gas instead of propane. I suggest checking that.

I was thinking something similar after I posted it. Cracked burners sometimes exhibit the same problem.

Originally Posted by HVAC_Marc

long high yellow flames often indicate a lack of combustion air.

Air shutter is fully open. I talked to someone today that said that the burner may be “blown”, some holes are larger than others over time and can cause uneven flame height which would in term cause my issue.

long high yellow flames often indicate a lack of combustion air.

Vulcan range with excessive carbon

Hey there.
Ive had two calls on two of the same ranges in two different locations the past week and the problem is confusing the crap out of me.

Alright so the issue im having is in the burner of the range section of the oven. When I got to both units the burner is so full of carbon that the flame catches at the air shutter and the entire inside of the oven is caked. I cleaned it up to the best of my ability and got it working again no problem, however, a week later i get a call back with the same issue.

- one unit is at 10.5” wc and the other at 11” wc. I tap into the top burner section but as i adjust the regulator on the back of the appliance the gas pressure doesnt change. The manufacturer spec calls for 10” wc, but i cannot adjust it.

- a work associate thought there was inadequate make up air and to check by letting all burners go on full heat for 15 minutes and to see if hot air is blowing out the bottom, I did this and it did not come out.

Im not the most familliar with Vulcan and the tech support suggested a new thermostat, this is very costly and it doesnt make sense that itd help anything.

The model on the unit is 36S-6BP. It uses propane as a fuel.