Lennox Hearth Crestline LSBV-3628MN - Manual (Page 15)

15
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 29
Burner Air Shutter Adjustment Procedure
To adjust the flame, position the air shutter to the
nominal setting (Figure 29). Allow the burner
to operate for at least 30 minutes. Observe the
flame continuously. If it appears weak or sooty
as previously described, adjust the air shutter
open or closed until desired effect is achieved.
NOTE: If the flame still appears anemic with
the air shutter closed all the way (usually a
result of lengthy vertical venting runs), turn
off the appliance, turn off the gas supply, wait
for the parts to cool and access the air shutter.
The shutter is prevented from actually closing
by a tab that is bent over into the opening.
Remove this obstruction by bending back.
Reassemble and restart the appliance and
after 24 minutes reobserve the flame. Adjust
the air shutter as described.
When satisfied that the appliance operates
properly, proceed to finish the installation.
Leave the control knob/lever in “ON” position
and turn the remote switch “OFF.” Replace the
refractory access panel.
Factory Air
Models Shutter Setting
Inches (mm)
LSBV-3628
Gas
Type
Natural 1/8" (3.175 mm)
Propane 1/2" (12.7 mm)
LSBV-4228
Natural 1/8" (3.175 mm)
Propane 1/2" (12.7 mm)
Orifice
Air Shutter
Burner Tube
Adjusting
Set Screw
WARNING
• Air shutter adjustment should
only be performed by a quali-
fied professional service tech-
nician.
CAUTION
• Soot will be produced if the
air shutter is closed too much.
Any damage due to carboning
resulting from improperly
setting the air shutter is not
covered under the warranty.
• The air shutter door and nearby
appliance surfaces are hot.
Exercise caution to avoid
injury while adjusting flame
appearance.
Burner Air Shutter Adjustment Procedure Step 10. BURNER ADJUSTMENTS
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. After 15 minutes of
operation, if the flame is 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 opening is 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.
Sooting is caused by incomplete combustion in
the flames and lack of combustion air entering
the air shutter opening. To achieve a warm
yellowish-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.
• If there are offsets in the vent system, the air
shutter opening may need to be increased.
• 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 to 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
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