26
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
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.
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.
Top Flange Glass door
assembly
Glass Door Latch (2)
Glass Door Assembly
Firebox Floor
Screws
Installing Glass Enclosure Panel
(see
Figure 47)
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 top of the door held away from the
fireplace (
Figure 47
). Lower the bottom of the
door assembly on the bottom door track and
set on padded surface. Pivot the door up after
engaging and centering in the base channel.
Using a Phillips screwdriver, fasten the door
frame to the door latch with the two (2) screws.
The latch should pull forward to engage the
door frame.
Install the door modesty shield on top flange
glass door as follows: grab the door modesty
shield with both hands, with the open hem
going down and engage it with the upper lip
of the glass door frame by pushing it all the
way down. Make sure the installed shield is
firmly in place.
With the firescreen hanging on the screen rod,
insert the right side of the rod into the existing
hole on the right modesty panel. Bend down
the rod at the center and drop the left end into
the slot on the left modesty panel, being careful
not to scratch the paint.
Step 9. INSTALLATION AND REMOVAL
OF GLASS DOOR
WARNING
•
When reinstalling the glass
door, the door latch screws
must be securely tightened
to prevent the glass door
from falling out, which could
potentially cause damage and
possible injury.
•
Do not attempt to substitute the
materials used on this door,
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 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.
Figure 47 - Installing the Glass Door
