64
ADJUSTMENT
Hussong Mfg. Co., Inc. • Kozy Heat Fireplaces
#BHM-52 R.1 May 2020
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
Center Burner Venturi
Side Burner Venturi
Natural Gas
1/4” (6.35mm)
1/8” (3.175mm)
Propane
1/2” (12.7mm)
1/4” (6.35mm)
11.2.1.1 Venturi Adjustment
NOTE: If soot is present on the logs, check log placement (section 8.4,
pg. 48) before adjusting the venturi.
1. Remove the safety barrier screen and glass frame assembly.
2. Remove log set, lava rock, and ember bed media tray.
3. Remove refractory panel set or black glass panel set.
4. Remove the log stop brackets.
5. Remove the side burners and center burners
6. Release the burner tube venturis off the burner orifices.
7. Loosen screw on venturi and adjust as necessary. Re-tighten
screw.
8. 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 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
Figure 11.2, Burner Venturis
Figure 11.3, Flame Appearance and Characteristics
Lazy, yellow flames - no adjustment necessary
Ideal Flame Appearance
Side burner
venturi (left side)
Side burner
venturi (right side)
Center burner venturi
Venturi(s) settings closed too far. Open venturi(s) slightly.
Dark, orange flames with black tips
Venturi(s) open too far. Close venturi settings(s) slightly.
Short, blue flames
Venturi settings(s) closed too far. Open venturi(s) slightly
OR gas pressure too high - check manometer settings
Lifting (ghosting) flames
