KitchenAid 720/730-0856 Guide D'utilisation page 34

Adjust High Flame Setting Screw
When converting from LP to Natural gas, you will need to
adjust the high flame setting screw for ideal burner flame
height.
1. Remove each control knob for the main burners and sear
burner
2. Use a flat-blade screwdriver to turn the high flame
setscrew counterclockwise approximate 90º.
3. Check that burner operates at the new high flame setting.
It may be necessary to adjust the screw setting slightly
more to get the ideal burner flame height.
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4. Put the burner control knobs back.