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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
SEE-THROUGH POWER VENT DV GAS FIREPLACES (LSM40ST-N-PV) • CARE AND OPERATION INSTRUCTIONS
Electronic Appliance Checkout
To light the burner, refer to the lighting instruc-
tions on Page 20. Ensure the igniter lights the
pilot. The pilot flame should engulf the flame
sensor as shown in Figure 23.
BURNER ADJUSTMENTS
(QUALIFIED TECHNICIANS ONLY)
Flame Appearance and Sooting
Proper flame appearance is a flame that 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
30 minutes of operation. After 30 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 enter-
ing 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.
Burner Air Shutter Adjustment Guidelines
• If there is smoke or soot present, rst 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 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
flame normalizes 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
Burner Air Shutter Adjustment Procedure
1. Light the appliance (follow lighting proce-
dure in Care and Operation Instructions or
on lighting label in control compartment).
2. Allow the burner to operate for at least 30
minutes while continuously observing the
flame to ensure that the proper flame ap-
pearance has been achieved (see Figures
21 and 22).
3. Adjust the air shutter using the Air Shutter
Adjustment Lever on the lower right side of
the firebox (see Figure 21).
• For more OPEN air shutter, slide lever
to the RIGHT.
• For more CLOSED air shutter, slide
lever to the LEFT.
A minimum shutter setting is designed into
the venturi by four 1/16"-inch tabs.
• If the ame appears weak or sooty (as
described on the previous page), adjust
the air shutter until proper flame appear-
ance is achieved.
• If ame stays lowered blue, incremen-
tally adjust the air shutter to a more
CLOSED position until proper flame
appearance is achieved.
Note: See Figures 21 and 22 for proper burner
flame appearance.
WARNING
HOT GLASS WILL CAUSE BURNS.
DO NOT TOUCH GLASS UNTIL COOLED.
•Fireplace surfaces get EXTREMELY HOT!
•The glass on the front of the fireplace
reaches EXTREMELY HIGH temperatures
and can cause severe burns if touched.
Even after the gas is turned off, fireplace
surfaces remain extremely hot.
CAUTION
RISK OF PERSONAL INJURY
OR PROPERTY DAMAGE.
• Air shutter adjustment should only be
performed by a qualified professional
service technician.
• 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.
Flame
Sensor
Pilot
Nozzels
Igniter
Rod
Pilot Hood
PILOT ASSEMBLY
Proper Pilot Flame Appearance
Figure 23
Burner Flame Appearance
(Opposite Control Side)
Volcanic Stone
Figure 22
Burner Flame Appearance
(Control Side)
Air Shutter
Adjustment Lever
Figure 21
Volcanic Stone