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Part number 550-100-400/0119
74
Sidewall vent/air termination: 3” or 4” concentric (cont.)
®
Series 4
gas-fired water boiler — Boiler Manual
Figure 82 Installin and supportin the concentric
sideall ent asseml
Figure 83
Ensure that the wall material is strong enough
to prevent the rain cap from being pushed
inward if struck or pushed from the outside.
Install terminations — concentric pipes
1. Assemble the vent termination as described for vertical concen-
tric terminations, beginning on page 76 .
If necessary, you can shorten the lengths of the inner
and outer pipes for a shorter fi nished assembly. But
you must ensure the pipes butt correctly at both ends.
Failure to properly assemble the concentric termina-
tion can result in fl ue gas recirculation, causing possible
severe personal injury or death.
2. Wall penetration:
a. 3” termination: Preferably, use a thimble with a 4½-inch
hole. If not using a thimble, carefully use a hole saw to cut a
hole not larger than 4¾ inches in diameter through the wall.
The fi nished hole must provide a solid stop for the rain cap
ribs, as shown in the inset to Figure 82 .
b. 4” termination: Preferably, use a thimble with a 6-inch hole.
If not using a thimble, carefully use a hole saw to cut a hole
not larger than 6¼ inches in diameter through the wall. The
fi nished hole must provide a solid stop for the rain cap ribs,
as shown in the inset to Figure 82 .
3. Secure the termination in place so the rain cap will butt against
the outside wall or outer thimble plate as shown in Figure 82 .
4. Before beginning vent and air piping from the boiler to the
concentric termination, mount and secure the concentric ter-
mination as shown in Figure 82 and Figure 105 .
The vent and air piping must be securely supported,
and must not rest its weight on the boiler fi ttings. Fail-
ure to properly support the vent and air piping could
result in vent piping damage, resulting in possible
severe personal injury, death or substantial property
damage.
The supports/bracing used must support the termina-
tion assembly to prevent slippage or movement.
The clamps used on the outside of the termination pipe
must not cut into the pipe or contain sharp edges that
could cause a crack to form.
When inserting the partially-assembled termination
kit through the roof penetration, wrap plastic or
other protection over the end of the exposed assembly
to prevent debris from entering the pipes. If the air
passages become blocked, the boiler will not operate.
Once the rain cap has been cemented to the assembly,
there is no way to correct the problem. The assembly
would have to be replaced if it were cut to be removed
and cleaned. Altering the assembly in any way could
result in severe personal injury or death due to toxic
fl ue product emissions.
When using AL29-4C stainless vent pipe, use the vent
pipe manufacturer’s PVC adapter when connecting to
the concentric vent attachment.
5. After the assembly has been positioned in the opening and all
supports have been attached, install a bird screen (purchased
separately if not included with the kit) and rain cap as follows:
a. Place the bird screen on the end of the inner pipe as in Fig-
ure 89, page 78 .
b. Cement the rain cap in place as shown.
installin termination see
pae
Install pipe supports every 5 feet
on both the horizontal and verti-
cal runs.
Install a hanger support within
6 inches of any upturn in the
piping.
Support the termination
at the wall as shown in the
termination instructions.
Slope horizontal piping
downward toward the boiler at
least 1/4 inch per foot.
Rotate the concentric
termination Y-fi tting about
30° to result in pipe centers the
same as at the boiler.
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