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Figure 61 -
Burner Flame Appearance
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.
Air Shutter Adjustment Guidelines
Amount of
Flame
Primary Air
Color
If air shutter is
Flame will
closed too far
be orange
If air shutter is
Flame will
open too far
be blue
32
WARNING: Air shutter adjustment
should only be performed by a
qualified professional service
technician.
WARNING:
front glass panel is in place and
sealed during adjustment.
CAUTION: The air shutter door
and nearby appliance surfaces
are hot. Exercise caution to
avoid injury while adjusting flame
appearance.
CAUTION:
produced if the air shutter is
closed too much. Any damage
due to carboning resulting from
improperly setting the air shut-
:
ter is not covered under the
Air Shutter
warranty.
Adjustment
Air shutter
gap should be
increased
Air shutter
gap should be
decreased
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Ensure that the
Carbon will be
Burner Air Shutter Adjustment Procedure
. Locate adjustment rod and adjust air shutter
to the standard setting as shown in Figure
62 (adjustment rod is located in the lower
control area).
Note: Rotating the adjustment rod coun-
terclockwise decreases air and clockwise
increases air.
2. Light appliance (follow lighting procedure
on lighting label in control compartment or
see care and operation manual).
3. Allow the burner to operate for at least 15
minutes while observing the flame continu-
ously to ensure that the proper flame appear-
ance has been achieved (see Figure 61). 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 flame
appearance is achieved.
• If flame stays lowered blue, adjust the
air shutter, incrementally, to a more
closed position until the proper flame
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 satisfied that the burner flame ap-
pearance is normal, close the lower control
compartment door then proceed to finish
the installation.
Decrease Shutter Opening
In This Direction
Orifice
Increase Shutter Opening
In This Direction
Air Shutter
Ref. Air shutter Patent:
Adjusting Rod
U.S. Pat. 5,553,603
Note - Burners are omitted in this view for clarity.
Main Burner Factory Air Shutter
Opening Setting - All Models
Model
Natural
Gas
/8"
MPD35ST/PF
3.2mm
Adjustment Rod Positions
Figure 62
(when viewed from above)
Propane
Gas
/4"
6.4mm
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