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8 - VENT DAMPER INSTALLATION & INSTRUCTIONS
Connecting The Vent Damper And Vent Connector
Refer to page 4 for size and location of vent (flue opening).
NOTICE
Damper blade on furnished vent damper has 1/2
square inch hole (approximately 3/4” diameter).
Boilers equipped with intermittent ignition, hole
should be plugged by using plug supplied with vent
damper.
1.
Follow damper installation instructions provided with
damper.
2.
Position furnished vent damper on top of flue outlet
collar. Fasten damper securely to flue outlet collar with
sheet metal screws. Verify damper blade has clearance
to operate inside of diverter. Do not modify either draft
diverter or vent damper during installation.
As An Option
Damper may be installed in horizontal or vertical
position, closer to flue outlet collar preferred. See
Figures 8-1, 8-2, 8-3 and enclosed vent damper
instructions.
3.
Install vent damper to service only single boiler for
which it is intended. Damper position indicator shall be
in visible location following installation. Locate damper
so it is accessible for servicing. See Figure 8-2 page 22.
4.
Damper must be in the open position when appliance
main burners are operating.
5.
Boiler is equipped with factory wired harness that plugs
into vent damper.
6.
Slope pipe up from boiler to chimney not less than 1/4”
per foot.
7.
Run pipe as directly as possible with as few elbows as
possible.
8.
Do not connect to fireplace flue.
9.
End of vent pipe must be flush with inside face of
chimney flue. Use a sealed-in thimble for chimney
connection.
10.
Clearance of not less than 6 inches (152mm) between
Vent Damper and combustible material must be
maintained. Additional clearance should be allowed for
service of Vent Damper.
11.
Vent Damper position indicator must be in visible
location following installation.
Fasten sections of vent pipe with sheet metal screws to
make piping rigid. Support horizontal potions of vent
system to prevent sagging. Use stovepipe wires every 5’ to
support pipe from above. Use double wall vent pipe if vent
pipe must go through crawl space. Where vent pipe passes
through combustible wall or partition, use ventilated metal
thimble. Thimble should be 4 inches larger in diameter than
vent pipe.
Figure 8-1 - Vent Damper Installation
8.1 Vent Damper
PN 240012785 Rev. C [11/15/2020]
