MortenA - Your comment about swamping a non technical person with 55 pages of technical material is valid. I was hoping it would be enough to give the idea that modifying a oven to correct some "problem" is not a simple task.
So here is how i would approach this problem.
Assume the initial setup was not completed correctly.
So the first task is to review the reportedly sparse information that came with the oven.
There should be some instructions for initial adjustment of the burner. They should be something like this.
Pizza ovens are all similar enough that using a search similar to
will find enough instruction manuals that one should look similar to your oven.
Use these instructions to adjust the high flame setting to not exceed the burner rating on the oven label plate. This may require adjusting the pressure regulator setting (the one that is part of the oven).
Then adjust the air fuel ratio by adjusting the quadrant at the fan outlet.
If this threads guidance is confusing, you should consider hiring a gas fitter or oven installer familiar with initial setup of commercial kitchen equipment.
