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18
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Electronic Appliance Checkout
To light the burner, refer to the lighting instruc-
tions on Pages 26 and 27. Ensure the igniter
lights the pilot. The pilot flame should engulf
the flame sensor as shown in Figure 18.
SIT Millivolt Appliance Checkout
The pilot flame should be steady, not lifting
or floating. 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" min (tip) of the
quick drop out thermocouple should be engulfed
in the pilot flame. The flame should project 1"
(25 mm) beyond the hood at all three ports
(Figure 17).
To light the burner, refer to the lighting instruc-
tions on Pages 24 and 25.
Figure 18
3/8" to 1/2"
(9 -13 mm)
Ground
Electrode
Flame Rod
Hot Surface
Igniter
Proper Flame
Adjustment
Pilot
Nozzels
ELECTRONIC PILOT ASSEMBLY
Proper Pilot Flame Appearance
Figure 17
Thermocouple
Thermopile
Pilot
Nozzels
SIT MILLIVOLT PILOT ASSEMBLY
3/8" Min.
(9 mm)
Igniter Rod
Hood
Proper Pilot Flame Appearance
Burner Adjustments
Note - The air shutter for the burner primary
air opening is factory-set. Do not adjust the
factory-set position. The factory-set position
is shown in Figure 16.
Figure 16
Burner Air Shutter Adjustment
Main Burner Factory Air Shutter
Opening Setting - Inches (millimeter)
Model Natural
Gas
Propane
Gas
MPB-3328 Fully Closed
3/16"
(4.76 mm)
MPB-3530 Fully Closed
3/16"
(4.76 mm)
MPB-4035 Fully Closed
3/16"
(4.76 mm)
MPB-4540 Fully Closed
3/16"
(4.76 mm)
Burner Air Shutter Adjustment Procedure
WARNINGS
• Air shutter adjustment should
only be performed by a quali-
fied professional service
technician.
• Ensure front glass panel are
in place and sealed during
adjustment.
CAUTIONS
• Soot will be produced if the
air shutter is closed too much.
Any damage due to carboning
resulting from improperly
setting the air shutter is not
covered under the warranty.
• The air shutter door and nearby
appliance surfaces are hot.
Exercise caution to avoid
injury while adjusting flame
appearance.
Setscrew - Factory located in the natural gas
position; relocate set screw for LP/propane
gas in the alternate position. See table for air
shutter openings for these setscrew locations.
Air Shutter
Venturi
Ref. Air shutter Patent:
U.S. Pat. 5,553,603