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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
BURNER ADJUSTMENTS
(QUALIFIED TECHNICIANS ONLY)
Flame Appearance and sooting
Proper fl ame appearance is a fl ame which is
blue at the base and becomes yellowish-orange
in the body of the fl ame. When the appliance
is fi rst lit, the entire fl ame may be blue and will
gradually turn yellowish-orange during the fi rst
15 minutes of operation. If after a short period
the fl ame stays lowered blue, or if the fl ame is
orange with evidence of sooting (black tip), the
air shutter opening may need to be adjusted.
If the air shutter openings closed too far, sooting
may develop. Sooting is indicated by black puffs
developing at the tips of very long orange fl ames.
Sooting results in black deposits forming on the
logs, appliance inside surfaces and on exterior
surfaces adjacent to the vent termination. Soot-
ing is caused by incomplete combustion in the
fl ames and lack of combustion air entering the
air shutter opening. To achieve a warm yellow-
ish-orange fl ame with an orange body that does
not soot, the shutter opening must be adjusted
between these two extremes.
Air Shutter Adjustment Guidelines
• If there is smoke or soot present, fi rst check
the log set positioning to ensure that the
fl ames are not impinging on any of the logs.
If the log set is properly positioned and a
sooting condition still exists, then the air
shutter opening should be increased.
• The more offsets in the vent system, the larger
the air shutter opening will need to be.
• An appliance operated with the air shutter
opened too far, may have fl ames that appear
blue and transparent. These weak, blue and
transparent fl ames are termed anemic.
• Propane models may exhibit fl ames which
candle or appear stringy. If this is present
and persists, adjust the air shutter to a more
open position, then operate the appliance for
a few more minutes to ensure that the fl ame
normalizes and the fl ames do not appear
sooty.
The following chart is provided to aid you in
achieving the correct air shutter adjustment
for your installation.
Air Shutter Adjustment Guidelines:
Amount of
Primary Air
Flame
Color
Air Shutter
Adjustment
If air shutter is
closed too far
Flame will
be orange
Air shutter
gap should be
increased
If air shutter is
open too far
Flame will
be blue
Air shutter
gap should be
decreased
Figure 10 - Burner Flame Appearance Model LMDV-3328 & LMDV-3530
Figure 11 - Burner Flame Appearance Model LMDV-4035