Lennox Hearth Products MONTEBELLO LSM40MP-2 Installation Instructions Manual page 27

Burner Air Shutter Adjustment Procedure
WARNING
• Air shutter adjustment should
only be performed by a quali-
fied professional service
technician.
• Ensure that the front glass
door assembly is in place and
sealed After adjustment.
CAUTION
Soot will be produced if the air
shutter is closed too much. Any
damage due to carboning result-
ing from improperly setting the
air shutter is not covered under
the warranty.
To.adjust.the.flame,.rotate.the.air.shutter.toward.
the.back.or.toward.the.front.of.the.fireplace..
Position.the.air.shutter.to.the.factory.setting.as.
shown.in.the.table.in.Figure 50...Allow.the.burner.
to.operate.for.at.least.15.minutes...Observe.the.
flame.continuously..If.it.appears.weak.or.sooty.
as.previously.described,.adjust.the.air.shutter.
until.the.flame.appearance.is.as.desired..
Use the extension knob (refer to Figure 38), to
adjust the flame height as desired, by sliding
the knob over the variable flame adjustment
knob located on the front of the valve. Replace
the extension knob back to the hanger after
the adjustment.
Propane. models. may. exhibit. a. flame. pattern.
that. may. candle. or. appear. stringy.. If. this. is.
problematic. or. persists. as. the. appliance. is.
continually. operated,. adjust. the. air. shutter.
closed.as.described.in.the.previous.paragraphs..
Operate.the.appliance.for.a.period.of.time.as.the.
effect.diminishes,.ensuring.that.the.appliance.
does.not.develop.sooty.flames...When.satisfied.
that.the.appliance.operates.properly,.proceed.
to.finish.the.installation.
Leave.the.control.knob.in.the.ON.position.and.
the.remote.switch.OFF.
Main Burner Factory Air Shutter
Opening Setting - Inches (millimeter)
Model Nat.Gas Propane Gas
LSM40-2 1/16 (1.59)
LSM45-2 1/16 (1.59)
Figure 50
(Birch Logs Shown) LSM40-2
Figure 51 - Burner Flame Appearance
(Rustic Oak Logs Shown) LSM45-2
Figure 52 - Burner Flame Appearance
NOTE:.DIAGRAMS.&.ILLUSTRATIONS.ARE.NOT.TO.SCALE.
Air Shutter
Opening
Venturi
9/32 (7.14)
9/32 (7.14)
Burner
Venturi
Orifice
Gas
Valve
27