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LENNOX HEARTH PRODUCTS • MERIT
Step 9. INSTALLATION AND REMOVAL
OF GLASS DOOR
WARNING
• Do not attempt to substitute the
materials used on these doors,
or replace cracked or broken
glass.
• Handle this glass with extreme
care! Glass is susceptible to
damage – Do not scratch or
handle roughly while reinstall-
ing the glass door frame.
• The glass door(s) of this appli-
ance must only be replaced as
a complete unit as provided
by the manufacturer. Do not
attempt to replace broken,
cracked or chipped glass sepa-
rately.
• 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.
Only doors certified with the appliance
shall be used.
Seules des portes certifiées pour cet
appareil doivent être utilisées.
CAUTION: DO NOT abuse glass door by
striking or slamming shut.
Removing Glass Enclosure Panels
(see Figure 44)
1. To access the glass door securing latches,
first open the lower control compartment
door (Figure 44) by sliding and pulling the
bottom panel forward.
2. Pull the latches forward and down to release
them from the door channel.
30
SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS
®
3. Pull the bottom of the door out a few inches
and grasp it on the right and left. Gently lift
to release the door from its channel above
the door. Pull the door forward.
4. 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.
5. Inspect the gasket for defects. Ensure it is
properly located. Make sure the bead is not
rolled up into the channel at the top of the
door, but remains flat against the top of the
glass (see Figure 44).
6. Position the door in front of the firebox
opening with the bottom of the door held
away from the fireplace (Figure 44). Hook
the top flange of the door frame over the top
of the firebox frame.
7. 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.
8. Install the hood. Note the location of the
three clips inside the top air channel above
the door. The clips are equally spaced on
the top surface of the air channel opening.
Use a screwdriver to open the clips slightly
if needed. Engage the back edge of the
eyebrow into the clips to secure.
Ensure Gasket Is Not Rolled
Up Into Door Frame Channel
Glass
Door
Control
Compartment
Panel
Note: When installing the glass door, ensure the
spacing on both sides are equal.
Figure 44 -
INSTALLING OR REMOVING GLASS DOOR
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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 openings 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 appliance inside sur-
faces 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 yel-
lowish-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, the air
• The more offsets in the vent system, the larger
• An appliance operated with the air shutter
Header
Spacing
Top
Standoffs
• Propane models may exhibit flames which
5/8"
Nailing
Flange
1/2"
Nailing
Flange
The following chart is provided to aid you in
achieving the correct air shutter adjustment
for your installation.
Flush
Glass Door
Nailing
Spring Latch
Flange
If air shutter is
Hood
closed too far
If air shutter is
open too far
shutter opening should be increased.
the air shutter opening will need to be.
opened too far, may have flames that appear
blue and transparent. These weak, blue and
transparent flames are termed anemic.
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.
Air Shutter Adjustment Guidelines
Amount of
Flame
Air Shutter
Primary Air
Color
Adjustment
Flame will
Air shutter
be orange
gap should be
increased
Flame will
Air shutter
be blue
gap should be
decreased
:
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