Excess sooting with gas charbroiler and hotplate

8
2
Joined Nov 2, 2017
I am using a Vulcan VCRH24 4-hob gas hotplate and a Vulcan WCRB25 gas charbroiler and both are creating too much of a yellow flame, even after adjusting the air inlets. This is resulting in bad sooting on the underside of pans - a thick residue of greasy soot, which is also caking the underside of the radiants on the charbroiler.

The gas is from canisters (LPG/Propane), not street gas (natural) - any thoughts on this? I am in Brazil, so I don't know if the quality of the gas itself may impact the sooting, but it does not seem right to me.

Both units are under warranty and were installed by authorised installers, so I can probably get them to come back out and take a look.

1z23zt4.jpg
 
1,341
865
Joined Mar 1, 2017
The sooting is caused by incomplete combustion. The incomplete combustion also produces carbon monoxide, which is very dangerous, as you know. The incomplete combustion could be caused by a number of things, including impure fuel.

If this were my kitchen, I would cease using these units immediately and get them checked out.

Good luck.
 

dogfood

Banned
27
9
Joined Mar 3, 2018
Yellow flame typically means too much fuel, not enough air.
Natural gas orifices are larger than LP , so that might be the problem.
Are you sure the units were designed for LP gas? Markings/Mfr. plates on the back?
Fix might be as easy as brass orifice swap outs.
 
8
2
Joined Nov 2, 2017
Thanks D dogfood - yes, definitely made for LP gas as standard, but there is also a conversion kit for running them on mains gas which the installers can fit. I am going to speak to the installers and get them back in, but in the meantime will adjust the air-inlets again to allow more air in, without getting the 'dancing' flame problem. That done, I am going to have to try changing the gas supplier and see if it might be adulterated gas that is the issue.
 
8
2
Joined Nov 2, 2017
There is a good video here on the adjustment that is the same on my model How to adjust air shutters on stove tutorial DIY - Windy City Restaurant Equipment Parts
 
813
297
Joined May 25, 2015
Interesting that it is greasy soot. That would suggest an impurity in the gas you are using.
 
8
2
Joined Nov 2, 2017
Interesting that it is greasy soot. That would suggest an impurity in the gas you are using.
Thanks halb halb - yes, I find the greasy aspect to it strange. I am actually using diluted oven degreasing agent to clean the bottom of some pans. I will get a video of this over the weekend, and see what impact changing the air inlets will have. We get adulterated petrol in Brasilian petrol stations, so it would not surprise me to find out that we have this with gas bottles also.
 
8
2
Joined Nov 2, 2017
I am calling the installers back - have a look at this. This is the front burner, which is far worse:


The back burner, less so:
 

Latest posts

Top Bottom