Burner Flame Adjustments–Burner Venturi
SECTION 11
ADJUSTMENT
#CAR-39
R.11 February 2022
54
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.
The air shutter on this appliance is factory set for horizontal
terminations, and may need adjustment for natural gas installations,
depending on venting length and configuration. Hussong Mfg.
Co., Inc. recommends natural gas venting installation with at least
4’ (1219mm) of vertical height to adjust the air shutter openings as
outlined in
Table 11.3, Factory Set Venturi Openings
Fuel
Front
Back
Natural Gas
1/8” (3mm) open
1/8” (3mm) open
Propane
7/16” (11mm) open
5/16” (8mm) open
Table 11.4, Recommended Venturi Opening for
Natural Gas Vertical Venting
Fuel
Front
Back
Natural Gas
1/8” (3mm) open
Closed
11.2.1.1 Venturi Adjustment
NOTE: If soot is present on the glass, check log placement (section
on page 44) before adjusting the venturis.
1. Remove the safety barrier, glass frame assembly, and log set.
2. Remove the front burner from the firebox (2) screws.
3. Remove the back burner tube.
4. Loosen screw on venturis and adjust as necessary. Tighten screw.
5. 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
Front Venturi
Back Venturi
FIGURE 11.3
Flame Appearance and Characteristics
FIGURE 11.2
Burner Venturis
