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10.2 Burner Tube Venturi Adjustment
10.2.1 Flame Appearance
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.
WARNING: To avoid property damage or personal injury, allow
the fireplace ample time to cool before making any adjustments.
LAZY, YELLOW FLAMES
IDEAL
Figure 10.2, Correct Burner and Pilot Flame Appearance
10.2.2 Venturi Adjustment
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.
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
re-tighten screw.
5. Reinstall 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 10.3, Factory Set Air Shutter Opening
NG
⅛” (3 mm) OPEN
LPG
⅝” (16 mm) OPEN
10.2.3 Flame Appearance and Adjustment
IMPORTANT: Slight adjustments to the 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 always allow the appliance ample time to cool
before making any further adjustments.
Cause:
Venturi closed too far
Excessive Burner media
Solution:
Open venturi slightly
Remove burner media as necessary
Cause:
Venturi open too far
Solution
: Close setting slightly
Cause:
Improper Venting
Gas Pressure too high
Venturi closed too far
Solution:
Check the vent pipe and vent cap
Check manometer settings
Open venturi setting slightly
DARK, ORANGE FLAME
WITH BLACK TIPS
SHORT, BLUE FLAMES
LIFTING (GHOSTING) FLAMES
Summary of Contents for Chaska-34 LOG
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