Burner Flame Adjustments
SECTION 11
ADJUSTMENT
#SFD-36
R.6 February 2022
53
HUSSONG MFG. CO., INC.
KOZY HEAT FIREPLACES
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
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.
Slight adjustments to the venturi opening will create dramatic results.
Adjust at slight increments until desired look is achieved.
Table 11.3, Factory Set Venturi Openings
Fuel
Air Shutter Opening
Natural Gas
3/16” (4.7mm) OPEN
Propane
5/8” (16mm) 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.
3. Remove the pilot shield.
4. Remove (2) screws securing burner assembly. Release the burner
tube venturi off the burner orifice.
5. Loosen screw on venturi and adjust as necessary. Re-
tighten screw.
6. Reinstall all components previously removed.
Lazy, yellow flames - no adjustment necessary
Ideal Flame Appearance
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
BURNER VENTURI
FIGURE 11.3
Flame Appearance and Characteristics
FIGURE 11.2
Burner Venturi
