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Burner Air Shutter Adjustment Procedure
1. Locate adjustment rod and adjust air shutter
to the standard setting as shown in Figure
12 (adjustment rod is located in the lower
control compartment). Note: Rotating the
adjustment rod clockwise decreases air and
counterclockwise increases air.
2. Light appliance (follow lighting procedure on
lighting label in control compartment or see
homeowners manual).
3. Allow the burner to operate for at least 15 min-
utes while observing the fl ame continuously
to ensure that the proper fl ame appearance
has been achieved (see Figure 10 or 11). If
the following conditions are present, adjust
accordingly.
• If flame appears weak or sooty, adjust
the air shutter, incrementally, to a more
open position until the proper fl ame
appearance is achieved.
• If fl ame stays lowered blue, adjust the
air shutter, incrementally, to a more
closed position until the proper fl ame
appearance is achieved.
4. Leave the control knob (off/pilot/on) in the
ON position and the burner OFF/ON switch
OFF (& remote switches, if applicable).
5. When satisfi ed that the burner fl ame ap-
pearance is normal, close the lower control
compartment door.
WARNING
Air shutter adjustment should
only be performed by a qualifi ed
professional service technician.
WARNING
Ensure front glass panel is in place
and sealed during adjustment.
CAUTION
The air shutter door and nearby
appliance surfaces are hot. Exer-
cise caution to avoid injury while
adjusting fl ame appearance.
12
CAUTION
Carbon will be produced if the air
shutter is closed too much. Any
damage due to carboning result-
ing from improperly setting the
air shutter is not covered under
the warranty.
Burner Air Shutter Adjustment
Adjustment Set-Screw
Adjustment Rod Up
(Fully Open Position)
Burner Tube
Air Shutter
Adjustment Rod Down
(minimum air opening
Ref. Air shutter Patent:
position)
U.S. Pat. 5,553,603
Main Burner Factory Air Shutter
Opening Setting - Inches (millimeter)
Model
Natural
Gas
1/16"
LMDVT-3328
(1.58 mm)
1/16"
LMDVR-3328
(1.58 mm)
1/16"
LMDV-3530
(1.58 mm)
1/8"
LMDV-4035
(3.18mm)
Figure 12
Millivolt Appliance Checkout
The pilot fl ame should be steady, not lifting
or fl oating. Flame should be blue in color with
traces of orange at the outer edge.
The top 3/8" (10 mm) at the pilot generator
(thermopile) and the top 1/8" minimum (tip)
of the quick drop out thermocouple should be
engulfed in the pilot fl ame. The fl ame should
project 1" (25 mm) beyond the hood at all three
ports. See Figures 13 or 14.
To light the burner, refer to the lighting instruc-
tions on Pages 18 & 19.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
SIT MILLIVOLT PILOT ASSEMBLY
Proper Pilot Flame Appearance
Thermocouple
Pilot
Nozzels
Figure 13
HONEYWELL MILLIVOLT PILOT ASSEMBLY
Proper Pilot Flame Appearance
1/8" Min.
(3 mm)
Propane
Pilot
Gas
Nozzels
1/4"
(6.35 mm)
Figure 14
1/4"
(6.35 mm)
Electronic Appliance Checkout
5/16"
(7.94 mm)
To light the burner, refer to the lighting instruc-
3/8"
tions on Pages 19 & 20. Ensure the igniter
(9.53 mm)
lights the pilot. The pilot fl ame should engulf
the fl ame sensor as shown in Figure 15.
ELECTRONIC PILOT ASSEMBLY
Proper Pilot Flame Appearance
Proper Flame
Adjustment
Pilot
Nozzels
Figure 15
With proper care and maintenance, your appli-
ance will provide many years of enjoyment. If
you should experience any problem, fi rst refer
to the troubleshooting guide in this manual.
If problem persists, contact your Lennox
distributor.
Igniter Rod
Hood
3/8" Min.
(9 mm)
Thermopile
Thermocouple
Igniter Rod
Hood
3/8" Min.
(9 mm)
Thermopile
3/8" to 1/2"
(9 -13 mm)
Ground
Electrode
Flame Rod
Hot Surface
Igniter
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