Step 9. Burner Adjustments; Finishing Requirements - Lennox LSS-35CN Installation Instructions Manual

Step 9. BURNER ADJUSTMENTS

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 and transparent.
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 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 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 flames impinge on any of them. If the
logs are properly positioned and sooting condi-
tions exist, the air shutter opening on the main
burner tube should be adjusted. Normally, the
more offsets 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.
IMPORTANT: ENSURE THAT THE FRONT
GLASS PANEL IS IN PLACE AND SEALED
DURING ADJUSTMENT.
Burner Adjustment
CAUTION
The air shutter adjustment rod
and nearby appliance surfaces
are hot. Exercise caution to
avoid injury while adjusting flame
appearance.
To adjust the flame, rotate the air shutter
adjustment rod toward the back or toward
the front of the fireplace (rod located in the
lower control area). Position the air shutter
to the factory setting as shown in the Table
of Figure 49. Allow the burner to operate for
at least 15 minutes. Observe the flame continu-
ously. 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 air shutter adjustment rod and associated
adjustable air shutter is patented technology.
Flame adjustments can be made quickly and
accurately to taste without the need of disas-
sembling the appliance and waiting for 30
minutes after each adjustment.
When satisfied that the appliance operates
properly, proceed to finish the installation.
Leave the control knob in the ON position and
the remote switch OFF.
Burner
Venturi
Tube
Air Shutter
Opening
Orifice
Air Shutter
Adjusting
Rod
F A C T
S H U T E T
G s a
M o e d s l
O P
y T e p
n i h c s e
N . t a 1 2 /
L S - S 5 3
P o r . p 5 8 /
N . t a 1 2 /
L S - S 0 4
P o r . p 5 8 /
Figure 49
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Vent Restrictor
The appliance has a built-in vent restrictor,
refer to Figure 49 for location of the adjustment
rod, to adjust the flow of exhaust gases. This
ensures proper combustion for all vent configu-
rations. Depending on the vent configuration,
you may be required to adjust the restriction
position. See below for guidelines.
The fireplace needs to be on
during the adjustment of the vent
restrictor. Use a glove to protect
your hand from burns.
Venting
Configuration
1. Horizontal Venting
with 6" vent section and
one 90° elbow.
2. Vertical venting.
3. Combination of ver-
tical and horizontal
venting.
*
Adjustment to the air shutter may be required
to get the desired flame appearance, (refer to
Air Shutter
Figure 49 ).
Arm

FINISHING REQUIREMENTS

Wall Details
Complete finished interior wall. To install the
appliance facing flush with the finished wall,
position framework to accommodate the thick-
ness of the finished wall (Figure 50 ).
O R Y A R I
1/2"
Drywall
R S E T T N I G
E N N I G
( m m )
1 ( . 3 ) 0
2"x 4"
Header
1 ( . 5 ) 8
1 ( . 3 ) 0
1 ( . 5 ) 8
Marble,
Tile, Or
Other Non-
Combustible
Materials
1/2"
Cement
Board
Figure 50
CAUTION
Adjustment Rod
Position
*
Pointed toward
the front.
*
Pointed toward
the left.
*
Adjust
accordingly for
best result.
This Area Must
Remain Clear of
Combustible
Materials
3" Min (76 mm)
1" Min
(25.4 mm)
Stand-Off
Fireplace
1/2" Drywall
27