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ADJUSTMENT
Hussong Mfg. Co., Inc. • Kozy Heat Fireplaces
#BIR-20-LE & MV R.3 January 2019
10.2 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.
10.2.1 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 10.3.
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 10.3, Factory Set Venturi Openings
Fuel
Front
Rear
Natural Gas
1/8” (3 mm)
1/8” (3 mm)
Propane
1/4” (6 mm)
1/2” (13 mm)
10.2.1.1 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, glass frame assembly.
2. Remove the log set and the back log plate (2) screws.
3. Remove the back burner (2) screws.
4. Remove the front burner (4) screws.
5. Loosen screw on venturis and adjust as necessary. Tighten screw.
6. 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 for at least 15 minutes, and
allow the appliance ample time to cool before making any further
adjustments.
Table 10.4, 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
SHORT, BLUE FLAMES
LIFTING (GHOSTING) FLAMES
Figure 10.3, Flame Appearance and Characteristics
DARK, ORANGE FLAMES
WITH BLACK TIPS
LAZY, YELLOW FLAMES
IDEAL
Figure 10.4, Burner Venturi Locations
FRONT BURNER VENTURI
BACK BURNER VENTURI
