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E. Air Shutter Setting
WARNING! Risk of Explosion or Delayed Ignition!
Improperly adjusted air shutter could cause soot buildup.
NOTICE: If sooting occurs, provide more air by opening
the air shutter.
Air shutter settings should be adjusted by a qualified ser-
vice technician at the time of installation. The air shut-
ter is set at the factory for a typical horizontal termination
through a 2 X 6 wall:
90 degree elbow off top with 9 inches horizontal.
Adjust air shutter for different vent runs. See Figure 9.5.
• Loosen the 1/4 inch screw.
• Twist the air shutter to adjust.
• Air shutter may be opened for longer horizontal vent runs.
• Tighten the 1/4 inch screw.
Shutter Setting Verification / Flame Appearance
•
After 15 minutes, the flames will be a yellow/blue mix.
The front flames may be blue at this time.
•
After 30 minutes, the flames should be yellow with
some blue flames near the burner ports.
•
After 1 hour, the flame will be at its maximum maturity.
NOTICE: Flames should not appear orange or stretch
to the top of the firebox. If flames are dark orange with
dark, smoky tips, provide more primary air to the burner
by opening the air shutter accordingly.
Flame Appearance on Extended Vertical Runs
Flame appearance can be improved on installations with
extended vertical runs by installing a mixing screw into
the adjustable shutter on burner neck.
1. With the shutter installed, replace the 1/4 inch screw
with the mixing screw supplied in manual bag and
tighten most of the way. See Figure 9.6.
2. Twist adjustable shutter to the fully closed position and
finish tightening the screw. See Figure 9.7.
Hearth & Home Technologies • DVLINEAR36 Installation Manual • 2569-980 Rev. E • 11/20
52
Figure 9.5 Air Shutter Location
Air Shutter Settings
DVLINEAR36
1/4 IN.
Figure 9.6 One Inch Mixing Screw
Figure 9.7 Mixing Screw Installed
NG
Propane
1/16 in.
1/16 in.
1 IN.
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