BORETTI CFBG902AN3 Instruction On Mounting And Use Manual page 66

Minimum burner setting adjustment
Check whether the flame spreads to all burner ports when the burner is lit
with the gas tap set to the minimum position.
If some ports do not light, increase the minimum gas rate setting.
Check whether the burner remains lit even when the gas tap is turned quickly
from the maximum to the minimum position. If the burner does not remain
lit, increase the minimum gas rate setting.
The procedure for adjusting the minimum gas rate setting is described
below.
* Light the burner.
* Set the gas valve to the "minimum rate" position.
* Remove the knob.
* Using a screwdriver turn the screw "A" until adjustment is correct (fig. 9.12).
* Dual burner: For the dual burner set the minimum (as indicated above)
for both the gas valves (one for the inner and one for the outer ring). The
operations must be carried out one gas valve at a time.
Normally for ULPG, the regulation screw is tightened up.
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