23
Inside
fi
rebox—roof venting port
10
0
Restrictors
ALL INSTALLATIONS REQUIRE A RESTRICTOR
for
improved
fl
ame picture and performance. This unit is
supplied with a pre-
fi
tted restrictor having di
ff
erent
positions or settings. The restrictor is shipped mounted
at the maximum open position. The level of restriction
required depends on the vertical rise in the venting
system and, to a lesser degree, the horizontal run and
number of elbows.
The amount of restriction is based on laboratory tests.
The ideal restrictor position may vary slightly, especially
when the vent pipe length is near the limits of the
acceptable con
fi
gurations for each type of restrictor.
The chart on the previous page shows the vent
restrictor required relative to the length of the vent
pipe.
The restrictors are located in the roof of the
fi
rebox
hidden above the top panel.
To access the restrictors, remove the top panel:
1. Remove 4 screws along the front or back of the
panel.
2. Release 4 screws along the other side of the panel. It
is not necessary to remove the screws.
3. Slide the panel to unhook it and set aside.
4. The restrictors are set in position 0, 0 at the fac-
tory. The position 0 is at the center and the position
10 is the farthest away from the center. Adjust the
restrictors position as needed—up to position 9—
DO NOT CLOSE ALL THE WAY TO POSITION 10!
:
a. Establish the required position of the restrictors
looking up the appropriate venting table (accord-
ing to vent pipes size) on the previous pages.
b. Remove the screws (2) on each restrictor already
installed
on the
fi
rebox roof port
.
c. Slide the restrictors in the required positions.
d. Re
fi
t and tighten the screws.
5. Reinstall the top panel sliding it on the screws previ-
ously released; tighten the screws.
6. Re
fi
t and tighten the screws previously removed.
Venting
Restrictors
