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45
M2-431 IS THE CONTINUATION OF THIS MASTER!
AIR SHUTTER ADJUSTMENT / BURNER
FLAME INSPECTION
Important: Air shutters are preset at the factory (see
Table 1 in MODEL SPECIFICATIONS).
However, gas conversion, altitude, or other
local conditions may make it necessary to
adjust the air shutters.
Note: Infrared and backburner air shutters are not
adjustable.
Note: To verify proper settings, the flames of the
burners should be visually checked for proper
flame appearance and behavior. Light the grill
with the burner(s) on HI setting. Allow at least 2
minutes to burn. See below and Fig. 45-1. The
flames should:
• be blue and stable with little to no yellow tips
• burn quietly, and appear to touch the burner
If the flames appear unstable, yellow, noisy, or lift away
from the burner, locate the appropriate section for your
burner type, and follow the steps.
Main Burner
Begin with a completely cool grill. Remove the burners
(see BURNER REMOVAL section). First ensure the
burner orifice, ports, venturi tubes, and air shutter are
all clear of any insect or insect nests. If they are blocked,
clean them, reinstall the burners, and reinspect the
flames. If adjustment is still needed, allow the unit to
cool, remove the burner, and proceed to the steps below.
1. To adjust the air shutter, loosen the adjustment screw
with a Phillips screwdriver. Then slide the shutter to
open or close it. See Fig. 45-2 for details.
• Begin with the appropriate factory setting for your
model (see Table 1 if needed).
• If the flames were excessively yellow (insufficient
air), open the shutter to allow more air to the
burner. If the flames were noisy and lifting off the
burner in some areas, close the shutter to allow
less air to the burner. Adjust accordingly.
Note: Make minimal adjustments. Very small changes
result in major changes in flame appearance.
2. Reinstall the burner, light the grill with the burner
on HI, and observe the flames. If needed, allow the
grill to completely cool, and repeat the adjustment
process until the proper flame is achieved.
3. Once finished, allow the grill to completely cool,
remove the burner, and tighten the adjustment screw.
Reinstall the burner and all other components that
were removed.
4. Repeat for all other main burners as needed.
++
Fig. 45-1 Proper flame appearance
Fig. 45-2 Main burner air shutter adjustment detail
Air shutter
opening
Adjustment
screw
Close
Open
SLIDE
(burner)
Main Burner Flames:
• blue
• stable
• quiet
• touching burner
SERVICING AND CLEANING (Cont.)
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