Burner Adjustments; Flame Appearance And Sooting; Adjustment - Lennox Hearth Products MDT3328CNM Care And Operation Instructions Manual

33" direct-vent gas fireplace heaters
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Latch
Bottom Vee-flange
Door Frame
Latch
Firebox Floor
Figure 3
Refer to Figure 3 and remove the front glass
enclosure panel as follows:
1. Remove the top louver or radiant panel.
2. Open the hinged drop-down control com-
partment panel.
WARNING: NO NOT ATTEMPT TO SUB-
STITUTE THE MATERIALS USED ON THIS
DOOR, OR REPLACE CRACKED OR BRO-
KEN GLASS WITH ANY MATERIALS
OTHER THAN THOSE PROVIDED BY THE
APPLIANCE MANUFACTURER.
THE GLASS DOOR OF THIS 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.
3. 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.
4. Swing the bottom of the door out and raise
it slightly to lift the top flange of the door frame
away from the appliance.
To install the front glass enclosure panel,
proceed as follows:
1. Retrieve the glass door frame. Visually
inspect the gasket on the backside of the
panel. The gasket surface must be clean, free
of irregularities and seated firmly.
6
2. Position the door frame in front of the
firebox opening and engage the top flange over
Top Flange
the lip at the top of the firebox opening.
Door Frame
Glass Door
3. Swing the door down and back. Ensure the
gasket seats evenly as the door draws shut.
Engage the Vee-flange at the bottom of the
door with the latches and close the latches to
secure the door.
4.Reinstall the top louver or radiant panel.

Burner Adjustments

The following paragraphs address burner ad-
justment concerns and procedures.

Flame Appearance and Sooting

Proper flame appearance is a matter of taste.
Generally most people prefer the warm glow of
a yellow to orange flame. Appliances operated
with air shutter openings that are too large will
exhibit flames that are blue, transparent and
much smaller than designed. These weak, blue
and transparent flames are termed anemic. If
the air shutter opening is too small 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 sur-
faces adjacent to the vent termination.
Sooting is caused by incomplete combustion in
the flames and a lack of combustion air entering
the air shutter opening. To achieve a warm
yellow to orange flame with an orange body that
does not soot, the shutter opening must be
adjusted between these two extremes. No
smoke or soot should be present. Reposition
the logs if the flames impinge on any of them.
If the logs are properly positioned and sooting
conditions exist, the air shutter opening on the
main burner tube should be adjusted. Normally,
the more elbows and horizontal runs there are
in the vent system, the greater the need for the
air shutter to be opened further.
WARNING: AIR SHUTTER ADJUSTMENT
SHOULD ONLY BE PERFORMED BY A
QUALIFIED PROFESSIONAL SERVICE
TECHNICIAN.
ENSURE THAT THE FRONT GLASS PANEL IS IN
PLACE AND SEALED DURING ADJUSTMENT.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Adjustment

CAUTION: THE ADJUSTMENT ROD AND
NEARBY APPLIANCE SURFACES ARE HOT.
EXERCISE CAUTION TO AVOID INJURY WHILE
ADJUSTING FLAME APPEARANCE.
To adjust the flame, move the adjustment rod
(located in the lower control area) up or down
to increase or reduce the air shutter opening
respectively. Initially, always position the air
shutter to the factory setting (the minimum
air opening position) as shown in Figure 4 .
This can be done by pulling the adjustment
rod all the way down. 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
by pushing or pulling on the adjustment rod
until the flame appearance is as desired.
The adjustment rod and associated adjustable
air shutter is patented technology. Flame ad-
justments can be made quickly and accurately
to taste without the need of disassembling the
appliance and waiting for 30 minutes after
each adjustment.
A F
T C
O
R
Y
A
R I
S
H
U
T
E T
R
E S
T T
N I
a N
u t
l a r
G
s a
P
M
o
e d
s l
n i
h c
s e
(
m
m
)
¹
₂ ₃ ⁄
M
D
T
3 3
8 2
(
. 0
) 8
M
D
R
3 3
8 2
Figure 4
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 "ON" position and
turn the remote switch "OFF." Close the lower
control compartment door.
G
o r
a p
e n
G
s a
n i
h c
s e
(
m
m
)
₆ ₁ ⁄
(
. 8
) 0

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