Burner Flame Adjustments - Lennox SLDVT-40 Care And Operation Instructions Manual

Burner adJustMents
(QuaLiFied tecHnicians onLY)
Flame appearance and sooting
Proper flame appearance is a flame which is
blue at the base and becomes yellowish-orange
in the body of the flame. When the appliance
is first lit, the entire flame may be blue and will
gradually turn yellowish-orange during the first
15 minutes of operation. If after a short period
the flame stays lowered blue, or if the flame 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 flames.
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
flames and lack of combustion air entering the
air shutter opening. To achieve a warm yellow-
ish-orange flame 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, first check
the log set positioning to ensure that the
flames 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 flames that appear
blue and transparent. These weak, blue and
transparent flames are termed anemic.
• Propane models may exhibit flames 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 t o ensure that the flame normal-
izes and the flames 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 Flame
primary air color
if air shutter is Flame will
closed too far be orange
if air shutter is Flame will
open too far be blue
10
Figure 9
Figure 10
Burner air shutter adjustment procedure
1. Locate adjustment rod and adjust air shutter
to the standard setting as shown in Figure
11 (adjustment rod is located in the lower
control compartment). Note: Rotating the
adjustment rod clockwise decreases air and
counterclockwise increases air.
2. Light appliance (follow lighting procedure on
lighting label in control compartment or see
homeowners manual).
3. Allow the burner to operate for at least 15 min-
utes while observing the flame continuously
to ensure that the proper flame appearance
has been achieved (see Figure 9 or 10). If
the following conditions are present, adjust
:
accordingly.
air shutter
• If flame appears weak or sooty, adjust
adjustment
the air shutter, incrementally, to a more
air shutter
open position until the proper flame
gap should be
appearance is achieved.
increased
• If flame stays lowered blue, adjust the
air shutter
air shutter, incrementally, to a more
gap should be
closed position until the proper flame
decreased
appearance is achieved.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
- Burner Flame appearance Model sLdVt-35
- Burner Flame appearance Model sLdVt-40
4. Leave the control knob (off/pilot/on) in the
ON position and the burner OFF/ON switch
OFF (& remote switches, if applicable).
5. When satisfied that the burner flame ap-
pearance is normal, close the lower control
compartment door.
WarninG: air shutter adjust-
ment should only be performed by
a qualified professional service
technician.
WarninG: ensure front glass
panel is in place and sealed during
adjustment.
caution: the air shutter door and
nearby appliance surfaces are hot.
exercise caution to avoid injury while
adjusting flame appearance.