KitchenAid 720-0787 Installation Instructions And Use & Care Manual page 20

3. Remove the access cover at the back of the grill hood by
removing the 4 screws (2 screws on each side of the rotisserie
burner).
4. Using a Phillips screwdriver, remove the 2 screws holding the
spider guard to the burner.
5. Use 24 mm wrench to remove the orifice nut.
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6. Take out the orifice support, and then use a 6 mm socket and
wrench or 6 mm nut driver to remove the LP orifice at the end of
the supply pipe. Replace with Natural gas orifice.
IMPORTANT: Check that the orifice is properly installed inside of
the supply pipe.
7. Reinstall the orifice support and supply pipe and tighten the nut
with a 24 mm wrench.
8. Reinstall the spider guard, access cover, and wind baffle.
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 side burner
by loosening the setscrew with the hex key.
2. Use a flat-blade screwdriver to turn the high flame
setscrew counterclockwise approximate 90 degree.
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.