Air Shutter Setting - Heat & Glo COSMO32-IFT-B Installation Manual

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 qualifi ed 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:
COSMO32-IFT-B: 90 degree elbow off top with 9
inches of horizontal vent pipe.
COSMO36-IFT-B/COSMO42-IFT-B: 12 inches of verti-
cal off the top of the appliance, 90 degree elbow, 9
inches of horizontal vent pipe.
Adjust air shutter for diff erent 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 Verifi cation / 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 fi rebox. If fl ames are dark orange with
dark, smoky tips, provide more primary air to the burner
by opening the air shutter accordingly.
Heat & Glo • COSMO32-IFT-B, COSMO36-IFT-B, COSMO42-IFT-B Installation Manual • 2619-980 Rev. G • 7/20
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Figure 9.5 Air Shutter Location
Air Shutter Settings
COSMO32-IFT-B
COSMO36-IFT-B
COSMO42-IFT-B
NG Propane
1/16 in. 1/8 in.
1/8 in. 1/4 in.
1/16 in. 3/16 in.