ADJUSTMENT
37
11.2 Burner Flame Adjustments
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.
11.2.1 Burner Venturi
WARNING: VENTURI ADJUSTMENT MUST BE DONE BY A
QUALIFIED SERVICE TECHNICIAN.
NOTE: Burner venturi air shutter settings have been factory set.
Refer to Table 11.3.
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.
Table 11.3, Factory Set Venturi Openings
Fuel
Air Shutter Opening
Natural Gas
1/8” (3 mm) OPEN
LP Gas
5/8” (15 mm) OPEN
11.2.1.1 Venturi Adjustment
NOTE: If soot is present on the glass, check log positioning
before adjusting the venturi. Logs must not block burner ports.
1. Remove the safety barrier and glass frame assembly.
2. Remove the log set and burner tube from firebox.
3. Loosen screw on venturi and adjust as necessary. Re-tighten
screw.
4. Reinstall all components previously removed.
IMPORTANT: Slight adjustments to the venturi opening will
create dramatic results. Adjust at slight increments until desired
look is achieved. Always burn the fireplace insert for at least 15
minutes, and allow the appliance ample time to cool before
making any further adjustments.
Table 11.4, Venturi Adjustment Guidelines
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
LAZY, YELLOW FLAMES
IDEAL
SHORT, BLUE FLAMES
DARK, ORANGE FLAME
WITH BLACK TIPS
LIFTING (GHOSTING) FLAMES
Figure 11.2, Flame Appearance and Characteristics
Figure 11.3, Burner Venturi
