Burner Flame Adjustments–Vent Restriction (after installation)
SECTION 11
ADJUSTMENT
#CAR-39
R.11 February 2022
55
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. Allow the
fireplace to burn for 15 minutes before making any adjustments.
Table 11.5, Restrictor Plate Adjustment Guidelines
Flame Appearance
Draft Problem
Solution
Short, flickering
Excessive draft
Not enough restriction
Close baffle restrictor
Add restrictor plate
Lifting or ghosting*
Insufficient draft
Open baffle restrictor
Remove inner ring(s)
on restrictor plate, or
Remove restrictor
plate
*If flames continue to lift or ghost after opening the restrictor and verifying
correct vent installation, shut off the gas supply and call a qualified service
technician.
11.2.2.1 Baffle Restrictor Adjustment
NOTE: Verify the baffle door restrictor is set into ‘down’ position and
not flipped ‘up.’
1. Remove the safety barrier and glass frame assembly to access
the baffle restrictor adjustment handle.
2. Loosen (2) thumb screws to adjust the setting to achieve desired
flame appearance.
3. Tighten screws after adjustment.
4. Reinstall the glass frame assembly and safety barrier.
11.2.2.2 Restrictor Plate Installation
1. Remove the safety barrier and the glass frame assembly.
2. To access the vent exit through the fireplace baffle, push baffle
restrictor back.
3. Bend the tabs on the restrictor plate (included in components
packet) to approximately 80° angles. This will create tension
when the restrictor is inserted into the exhaust pipe.
4. Insert restrictor into the 5” (127mm) exhaust pipe with the tabs
pointing towards you.
5. Set the baffle restrictor back into position.
6. Reinstall all components previously removed.
11.2.2.3 Restrictor Plate Modification
1. Remove the safety barrier and the glass frame assembly.
2. To access the vent exit through the fireplace baffle, push baffle
restrictor back.
3. Remove the restrictor by pulling it down and out of the 5”
(127mm) exhaust pipe.
4. Make necessary modifications to achieve desired flame
appearance.
5. Insert restrictor into the 5” (127mm) exhaust pipe with the tabs
pointing towards you.
6. Set the baffle restrictor back into position.
7. Reinstall all components previously removed.
Thumb Screws
Exhaust
Baffle Restrictor
Restrictor Plate
Remove innermost circle to
create less restriction
Remove all inner rings for
the least restriction
Bend tabs to approx. 80˚ angles to create tension
to hold itself in place when installed
Ideal Flame Appearance
Short, flickering flames
Lifting (ghosting) flames
Excessive draft - not enough restriction
Add restrictor plate
Insufficent draft - too much restriction
Remove innner ring(s) on restrictor plate or remove restrictor plate
Lazy, yellow flames - no adjustment necessary
FIGURE 11.5
Restrictor Plate
FIGURE 11.4
Baffle Restrictor
FIGURE 11.6
Flame Appearance and Characteristics for Restricting Vent
