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Innovative Hearth Products
DRC3000-B Series Direct-Vent Gas Fireplaces
18. Adjust the Air Shutter to Ensure Proper Flame Appearance
Flame Appearance and Sooting
The flame should be blue at the base, and yellow-orange in the body of the flame.
When the fireplace is first lit, the entire flame may be blue and will gradually turn yellow-orange during the first 15
minutes of operation. If the flame remains blue, or if the flame is orange with evidence of sooting (black tip), the air
shutter opening may need to be adjusted.
If the air shutter opening is closed too far, sooting may develop. Sooting is indicated by black puffs developing at the
tips of very long orange flames. Sooting results in black deposits forming on the logs, fireplace inside surfaces, and
on exterior surfaces adjacent to the vent termination.
Sooting is caused by incomplete combustion in the flames and lack of combustion air entering the air shutter
opening. To achieve a warm yellow-orange flame with an orange body that does not soot, the shutter opening must
be adjusted between these two extremes.
Air Shutter Adjustment Guidelines
•
•
•
•
Table 28 - Air Shutter Adjustment Guidelines
Amount of Primary Air
If air shutter is
closed too far
If air shutter is
open too far
Table 29 - Main Burner Shutter Opening—Factory Setting
NOTE: When rear venting or running fireplace for an extended period of time the shutter
should be moved to a more open position by pulling rod down. (especially on LP gas)
1. Move the adjustment rod down to increase air flow and up to decrease it. The rod is located in the lower control
2. Light the fireplace. Follow the lighting procedure on the lighting label in the control compartment or Pages 67-
3. Allow the burner to operate for at least fifteen (15) minutes while observing the flame continuously to ensure
4. When satisfied that the burner flame appearance is normal, turn fireplace to the off position and reinstall the
50
If smoke or soot is 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 persists, then the air shutter should be
opened more.
The more offsets in the vent system, the wider the air shutter will need to be opened.
A fireplace 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 that appear stringy. If this condition is present and persists, adjust the air
shutter to a more open position, then operate the fireplace for a few more minutes to ensure that the flame
normalizes and the flames do not appear sooty. The following chart is provided to help achieve the correct air
shutter adjustment for your installation.
Flame Color
Flame will
be orange
Flame will
be blue
Models
Natural Gas
All
1/4" (6.35 mm)
compartment. Position the air shutter to the factory setting (Table 29).
68.
that the proper flame appearance is achieved (Figure 47, Page 51). If the following conditions are present,
adjust accordingly:
• If flame appears sooty, adjust the air shutter, incrementally, to a more open position until the proper flame
appearance is achieved.
• If flame remains blue, adjust the air shutter, incrementally, to a more closed position until the proper flame
appearance is achieved.
required barrier. Then, proceed to finish the installation.
Air Shutter Adjustment
Air shutter gap should be increased
Air shutter gap should be decreased
Propane Gas
1/2" (12.7 mm)
Figure 46- Air Shutter Adjustment Rod
Adjustment
Set-Screw
Burner
Tube
Air Shutter
Adjustment
Rod Down
(Fully-Open
Position)
Installation
901191-00C, 07/2023
Adjustment
Rod Up
(Fully-Closed
Position)
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