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Vent installations shall be in accordance with "Venting of
Equipment," of the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, or applicable provisions of the local building
codes.
Check Your Chimney
This is a very important part of your heating system. It
must be clean, the right size, properly constructed and in
GOOD CONDITION. No boiler can function properly with
a bad chimney. Table 6 gives typical chimney size.
Fig.11 gives you an idea how a boiler might be vented to
a chimney. Note that the height (HT) is measured from the
vent pipe to the top of the chimney.
Table 6 - Typical Chimney Sizes
Boiler Input
(Btuh)
HT 10-15 Ft
Up to 100,000
6" x 6"
Up to 155,000
6" x 7"
Up to 230,000
7" x 8"
Up to 350,000
9" x 9"
*HT = Top of Thimble to top of Flue. See Figure 11.
Figure 11 - Typical Masonry Chimney
Requirements
2' Min
Connecting The Vent Damper And Vent Connector
Refer to Table 1 (page 4) fl ue diagram for the size and
location of the vent (fl ue opening). Use a 28 gauge (mini-
mum) galvanized pipe to connect to the chimney.
CHIMNEY AND VENT PIPE OPERATION
Flue Area in Inches
HT 15-25 Ft
HT 25 Ft & up
6" x 5"
5" x 5"
6" x 6"
6" x 5"
7" x 7"
6" x 7"
8" x 9"
8" x 8"
HT
Damper blade on furnished vent damper has
1/2 square inch hole (approximately 3/4"
diameter). On boilers equipped with standing
pilot, the hole must be left open. On boilers
equipped with intermittent ignition, the hole
should be plugged by using the plug supplied
with the vent damper.
Position furnished vent damper on top of fl ue outlet
1.
collar. Fasten damper securely to fl ue outlet collar
with sheet metal screws. Make sure damper blade has
clearance to operate inside of diverter.
•
As an option, the damper may be installed in
any horizontal or vertical position, closer to the
fl ue outlet collar preferred. Follow the diagrams -
Figures 12, 13 and 14.
Install the vent damper to service only the single boiler
2.
for which it is intended. The damper position indicator
shall be in a visible location following installation.
Locate the damper so that it is accessible for servicing.
The damper must be in the open position when
3.
appliance main burners are operating.
The boiler is equipped with a factory wired harness that
4.
plugs into the vent damper.
Vent pipe must be same size as the fl ue outlet collar.
5.
Slope pipe up from boiler to chimney not less than 1/4"
6.
per foot (21mm/m).
Run pipe as directly as possible with as few elbows as
7.
possible.
Do not connect to fi replace fl ue.
8.
End of vent pipe must be fl ush with inside face of
9.
chimney fl ue. Use a sealed-in thimble for the chimney
connection.
Horizontal run should not be longer than 3/4 the
10.
chimney height (HT) for single appliance venting. (see
Figure 11)
The sections of vent pipe should be fastened with sheet
metal screws to make the piping rigid. Horizontal portions
of the vent system must be supported to prevent sagging.
Use stovepipe wires every 5' to support the pipe from
above. If vent pipe must go through crawl space, double
wall vent pipe should be used. Where vent pipe passes
through combustible wall or partition, use ventilated metal
thimble. Thimble should be 4" larger in diameter than vent
pipe.
11
NOTICE
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