32
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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.
WARNING: Air shutter adjustment
should only be performed by a
qualified professional service
technician.
WARNING: Ensure that the
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: Carbon will be
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
warranty.
Adjustment Rod Positions
(when viewed from above)
Figure 62
Main Burner Factory Air Shutter
Opening Setting - All Models
Model
Natural
Gas
Propane
Gas
MPD35ST/PF
/8”
3.2mm
/4”
6.4mm
Air Shutter
Adjusting Rod
Increase Shutter Opening
In This Direction
Decrease Shutter Opening
In This Direction
Note - Burners are omitted in this view for clarity.
Orifice
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
Primary Air
Flame
Color
Air Shutter
Adjustment
If air shutter is
closed too far
Flame will
be orange
Air shutter
gap should be
increased
If air shutter is
open too far
Flame will
be blue
Air shutter
gap should be
decreased
Ref. Air shutter Patent:
U.S. Pat. 5,553,603
Vermiculite
Figure 61 -
Burner Flame Appearance
