Installation
900005-00, 10/2015
Innovative Hearth Products
Envy™ Direct-Vent Gas Fireplaces
38
CAUTION
• Soot will be produced if the air shutter is closed too much. Any damage due to sooting,
resulting from improperly setting the air shutter, is not covered under the warranty.
• The air shutter rod and nearby appliance surfaces are hot. Exercise caution to avoid injury
while adjusting 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
The rear burner circuit is equipped with an adjustable air shutter the front air shutter is fixed. The front air shutter
is set for best performance in most installations. However for long vent runs or at high altitude the front air shutter
may need to be adjusted. It is recommended to adjust the rear air shutter first then if needed remove the burner
assembly and adjust the front shutter.
• 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 candle or appear stringy. If this condition is present and persists, adjust
the air shutter to a more closed 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.
Table 21 - 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
Figure 33 - Air Shutter Adjustment Rod
Air Shutter
Adjustment Rod
To adjust the front air shutter:
With barrier, door and logs or media removed. Remove 2 or 3 screws securing the burner (2 on right side one of left
for traditional fireplaces).
Lift the right hand side and slide burner to the right to remove burner from unit.
Loosen screw securing front air shutter to factory setting. Open air shutter as desired. Tighten screw to secure air
shutter position and reinstall burner in reverse order.
Note: Rear air shutter has a self aligning air shutter linkage. Make sure linkage engages the air shutter when
reinstalling the burner.
