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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
Step 10. REMOVING AND INSTALLING
THE GLASS DOOR
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
Step 11. BURNER ADJUSTMENTS
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 15 minutes
of operation. If the flame remains 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, 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 closed 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.
Figure 56
Removing the Glass Enclosure Panel
(see Figure 56)
Remove the top louver assembly or radiant
panel. To access the glass door securing
latches, first open the lower control
compartment door (Figure 56 ) by pushing
in simultaneously the left and right top
corners of the door (the door is hinged at the
bottom).
Remove the bottom compartment door by
sliding the hinge pin, located at the door’s left
side, to the right until it disengages from the
left corner post hole. Pull the door diagonally
to the left, away from the fireplace.
Locate the two (2) latches at the top of the
control compartment and disengage them
from the door frame bottom vee-flange,
pulling down on their handles to open them.
Installing the Glass Enclosure Panel
(see Figure 56)
Retrieve the glass door. Visually inspect the
gasket on the backside of the frame. Gasket
surface must be clean, free of irregularities
and seated firmly.
Position the door in front of the firebox
opening with the bottom of the door held
away from the fireplace (Figure 56). Hook the
top flange of the door frame over the top of
the firebox frame.
Let the bottom of the door frame swing
gently in towards the fireplace ensuring that
the gasket seats evenly as the door frame
draws shut. Fasten the two latches located
underneath the firebox floor to the door's
vee-flange. Close both the latches securely.
Lower Compartment Door and Hinge
Glass Door Frame
Top Flange
Glass
Door
Glass Door Latch
Firebox Floor
Glass Door Frame
Bottom Vee-flange
Only doors certified with the appliance
shall be used.
Seules des portes certifiées pour cet
appareil doivent être utilisées.
WARNING: DO NOT abuse glass door by
striking or slamming shut.
WARNING
• Do not attempt to substitute
the materials used on these
doors, or replace cracked or
broken glass.
•Handlethisglasswith
extreme care! Glass is
susceptible to damage – Do
not scratch or handle roughly
while reinstalling the glass
door frame.
•Theglassdoorofthis
appliance must only be
replaced as a complete
unit as provided by the
manufacturer. Do not attempt
to replace broken, cracked or
chipped glass separately.
• Do not attempt to touch
the front enclosure glass
with your hands while the
fireplace is in use.
WARNING
Do not operate appliance with
the glass front removed, cracked
or broken.
AVERTISSEMENT
Ne pas utiliser l'appareil si le
panneau frontal en verre n'est
pas en place, est craqué ou
brisé.
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