![](/images/new-backgrounds/1086330/8633059x1.webp)
The
NOTE: It is normal for the burners without mixing tubes to have blowing flames during the first minute of operation. When the burner is cold, primary air injection is increased. Once the burner heats, the injection of primary air is reduced and the flames settle.
Not Enough Primary Air
The reduction of primary air slows the burning process and results in the inner cone rising higher in the flame. Less burning takes place in the inner cone. A larger amount of the
The size of the outer cone is also reduced by the lack of primary air. The outer cone cannot consume the volume of
| Yellow Tipping In |
| Outer Envelope |
| Outer Envelope |
Inner Cone | Outer Cone |
Unburned | Figure |
Air/Gas |
Over-Fueled Burner
•Excessive gas pressure entering the burner
•The BTU rating of the gas can be too high for the burner
•An oversized gas metering orifice
It is difficult to recognize the difference between an
| Yellow Tipping |
|
| And Soot Can Appear | |
| In Extreme Cases |
|
| Outer Envelope |
|
Flame | Outer Cone |
|
Too Tall |
|
|
| Flame Lifts | Figure |
| Off Burner | |
|
|
Page