31
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Step 9. INSTALLATION AND REMOVAL
OF 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 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 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.
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.
• 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 flames 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.
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
.
6.
Position the door in front of the firebox open-
ing with the bottom of the door held away
from the fireplace. 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.
Control
Compartment
Panel
Hood
Glass
Door
Header
Spacing
Top
Standoffs
Flush
Nailing
Flange
1/2”
Nailing
Flange
5/8”
Nailing
Flange
Glass Door
Spring Latch
Ensure Gasket Is Not Rolled
Up Into Door Frame Channel
INSTALLING/REMOVING GLASS DOOR
Figure 49
Note: When installing glass door, make
sure spacing on both sides is equal.
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 Panel
(see
Figure 49)
1.
To access the glass door securing latches,
lift and pull the bottom panel forward to open
the lower control compartment door.
2.
Pull the latches forward and down to release
them from the door channel.
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.
LENNOX HEARTH PRODUCTS • MERIT
®
SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS
