100001021-50
Figure 42: Vent restrictor.
FULLY OPEN
4“ OPEN
2“ OPEN
1“ OPEN
10’
20’
30’
40’
48’
0
1
2
3
4
Figure 41: Restrictor rise and run chart.
VENT RESTRICTOR
OPENING
The vent restrictor is located on the underside of the firebox top. The
unit leaves the factory with the vent restrictor open. The restrictor is
built into the appliance for secondary air flow adjustment. Adjustment
enables tuning the airflow for optimum flame appearance and perfor-
mance for a wide variety of vent configurations.
Setting:
• Determine the vent height.
• Determine the vent horizontal length.
• From the chart determine the restrictor position.
Refer to the chart (Figure 41) for the correct position of restrictor for the
vent configuration of your installation. Restrictor positions are based
upon lab tests. The ideal position may vary slightly with installation.
Restrictor position is too closed if the flame has the following
characteristics:
• Flame is excessively tall and lifting.
• Flame lacks movement.
• Flame soots.
Restrictor position is too open if the flame has the following
characteristics:
• Flame height is low.
• Flame has excessive movement.
To adjust the restrictor:
• Loosen the screw holding the restrictor.
• Move the restrictor to its intended opening.
• Re-tighten the screw.
WALL AND ROOF
TERMINATION
RESTRICTOR POSITION
CAUTION: The vent restrictor must be
fully open when using the power vent
26
TCWS54D2 091418-40
Vent Restrictor Adjustment
