22
Flame appearance is affected by several factors; including
altitude, venting configuration, and fuel quality. Although the
venturi setting has been factory set, adjustments may be
necessary for optimal performance and visual aesthetics.
When the fireplace is first lit, the flames will be blue. Flames
will gradually turn yellowish-orange during the first 15 minutes
of operation. If flames remain blue, or become dark orange
with evidence of sooting (black tips), the burner tube venturi
may need adjustment.
IMPORTANT
Slight adjustments to venturi opening will create dramatic results. Adjust at slight increments until desired look is achieved. Always
burn the fireplace for at least 15 minutes, and allow the appliance time to cool before making any further adjustments.
Figure 12.3, Burner Venturi
WARNING
To avoid property damage or personal injury, allow the fireplace ample to cool before making any adjustments.
12.2
Burner Tube Venturi Adjustment
12.2.1
Flame Appearance
Table 12.3, Factory Set Venturi Settings
NG
1/16 in. (2 mm) OPEN
LPG
1/2 in. (13 mm) OPEN
12.2.2
Venturi Adjustment
Figure 12.2, Correct Burner and Pilot Flame Appearance
Ideal
Lazy yellow flames
1. Remove the safety barrier and glass frame assembly.
2. Remove log set.
3. Remover burner assembly.
4. Loosen burner venturi screw and make the adjustment,
then retighten screw.
5. Re-install burner, making sure venturi is positioned over
burner orifice. Re-install burner venturi housing.
6. Reinstall all components previously removed.
7. Light fireplace. Wait at least 15 minutes before determining
if any further adjustments are necessary.
Table 12.4, Burner Tube Venturi Adjustment and Burner Flame Appearance
Venturi Position
Flame Color
Venturi Adjustment
Closed too far
Dark orange flame with black tips
Open venturi setting slightly
Open too far
Blue flames
Close venturi setting slightly
Venturi open too far
Short blue flames
Venturi closed too far
Excessive burner media
Dark orange flames / black tips
Improper Venting / Gas pressure too high
Lifting (ghosting) flames
Figure 12.4, Adjustment and Burner Flame Appearance
WARNING
Venturi adjustment should only be performed by a qualified personal service technician.
NOTE
If soot is present on the glass, check log positioning before adjusting the venturi. Logs must not block burner ports.
