Burner Flame Adjustments
SECTION 11
ADJUSTMENT
#BHM-38 & #BHM-38-BW
R.1 September 2021
72
HUSSONG MFG. CO., INC.
KOZY HEAT FIREPLACES
11.2.2 Vent Restriction (after installation)
WARNING: To avoid property damage or personal injury, allow the
fireplace ample time to cool before making any adjustments.
WARNING: Improper vent installation may cause the burner flames
to lift or “ghost.” Perform a visual check on flame appearance after
restriction adjustment to ensure proper performance.
Vertical terminations may display an active, compact flame. If this
appearance is not desirable, a restrictor plate may need to be installed
or modified after vent termination installation. Access to the vent exit
for restriction can be reached through the fireplace baffle.
Refer to
TABLE 11.4
and
FIGURE 11.6
for flame appearance
adjustments. Allow the fireplace to burn for 15 minutes before
making any adjustments.
11.2.2.1 Restrictor Plate Installation
1. Remove the safety barrier and the glass frame assembly.
2. Locate the 5” (127mm) exhaust pipe in the firebox ceiling.
3. Bend the tabs on the restrictor plate (included in components
packet) to approximately 80° angles. This will create tension
when the restrictor plate is inserted into the exhaust pipe.
4. Insert restrictor plate into the 5” (127mm) exhaust pipe with the
tabs pointing towards you.
5. Reinstall all components previously removed.
11.2.2.2 Restrictor Plate Modification
1. Remove the safety barrier and the glass frame assembly.
2. Remove the restrictor plate by pulling it down and out of the 5”
(127mm) exhaust pipe. Make necessary modifications to achieve
desired flame appearance.
3. Insert restrictor plate into the 5” (127mm) exhaust pipe with the
tabs pointing towards you.
4. Reinstall all components previously removed.
Table 11.4, Restrictor Plate Adjustment Guidelines
Flame Appearance
Draft Problem
Solution
Short, flickering
Excessive draft
Not enough restriction
Add restrictor plate
Lifting or ghosting*
Insufficient draft
Remove inner ring(s)
on restrictor plate, or;
remove restrictor plate
*If flames continue to lift or ghost after opening the restrictor plate
and verifying correct vent installation, shut off the gas supply and call a
qualified service technician.
Restrictor Plate
Bend tabs to approx. 80° angles to create
tension to hold itself in place when installed
Remove innermost circle
to create less restriction
Remove all inner rings for
the least restriction
Insert restrictor plate into 5” (127mm) exhaust pipe in
firebox ceiling with tabs facing towards you
Ideal Flame Appearance
Short, flickering flames
Lifting (ghosting) flames
Lazy, yellow flames - no adjustment necessary
Excessive draft - not enough restriction
Add restrictior plate
Insufficent draft - too much restriction
Remove inner ring(s) on restrictor plate or remove restrictor plate
FIGURE 11.5
Vent Access and Restrictor Plate
FIGURE 11.6
Flame Appearance and Characteristics for Restricting Vent
