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ADJUSTMENT
12.2 Flame Appearance Adjustment
WARNING: To avoid property damage or personal injury, allow
the fireplace ample time to cool before making any adjustments.
Burner flame appearance and characteristics are affected by
altitude, fuel quality, venting configuration, and other factors. After
installation, this appliance may need additional adjustments to
achieve optimum flame appearance and visual aesthetics.
12.2.1 Burner Venturi
WARNING: VENTURI ADJUSTMENT MUST BE DONE BY A
QUALIFIED SERVICE TECHNICIAN.
NOTE: Burner venturi air shutter settings have been factory set.
When this appliance is first lit, the burner flames will appear blue.
During the first 15 minutes of operation, flame appearance will
gradually turn to the desired yellow appearance. If the flames
remain blue, or become dark orange with evidence of sooting
(black tips), adjustment of the air shutter opening may be
necessary.
Regardless of venturi orientation, closing the air shutter will
achieve a desired yellow flame, but may produce soot on the
glass. Opening the air shutter will cause a short, blue flame that
may lift off the burner.
12.2.1.1 Venturi Opening Adjustment
NOTE: If soot is present on the glass, check log positioning
before adjusting the venturi. Logs must not block burner ports.
IMPORTANT: Slight adjustments to the venturi opening will
create dramatic results. Adjust at slight increments until desired
look is achieved. Follow Table 12.4 for guidance.
1. Remove the safety barrier, glass frame assembly, and log set.
2. Remove the back burner assembly secured with (2) screws.
The front burner assembly does not have to be removed to
adjust venturi.
3. Loosen screw on venturis and adjust as necessary. Tighten
screw.
4. Reinstall all components previously removed.
Table 12.3, Factory Set Venturi Openings
Fuel
Front
Rear
Natural Gas
1/16” (1.6 mm)
1/8” (3 mm)
LP Gas
5/8” (16 mm)
5/8” (16 mm)
Table 12.4, Flame Appearance Venturi Adjustment
Flame Characteristic
Cause
Solution
Dark, orange flame
with black tips
Venturi closed too far
Open venturi slightly
Short, blue flames
Venturi open too far
Close setting slightly
Lifting (ghosting)
flames
Gas pressure too high
Venturi closed too far
Check manometer
settings
Open venturi setting
slightly
IDEAL APPEARANCE - LAZY, YELLOW FLAMES
BACK VENTURI
FRONT VENTURI
Figure 12.2, Burner Venturi Location
Figure 12.3, Flame Appearance and Characteristics
SHORT, BLUE FLAMES
LIFTING (GHOSTING) FLAMES
DARK, ORANGE FLAMES
WITH BLACK TIPS
