Install Instructions (Venting)

Part number 550-100-103/1110
A–13
GAS-FIRED WATER BOILER — Manual addendum — Venting
Vertical vent/air termination: 3” or 4” concentric (cont.)
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 as-
sembly 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 flue product
emissions.
When using AL294C stainless vent pipe, use the vent pipe
manufacturer’s PVC adapter when connecting to the con-
centric vent attachment.
After the assembly has been positioned in the roof opening and all sup-2.
ports have been attached, install a bird screen (purchased separately if
not included with the kit) and rain cap as follows:
Place the bird screen on the end of the inner pipe as in a. Fig-
ure 17, page A-14.
Cement the rain cap in place as shown.b.
Vent termination support
Support the concentric vent/air termination at the roof penetration 1.
as shown in Figure 15.
The supports/bracing used must support the termination assembly s
to prevent vertical slippage or sideways movement.
The clamps used on the outside of the termination pipe must not s
cut into the pipe or contain sharp edges that could cause a crack
to form.
Concentric termination requirementsFigure 14
Concentric termination
(installing termination — see page A-11)
Install pipe supports every 5 feet on s
both the horizontal and vertical runs.
Install a hanger support within s
6 inches of any upturn in the piping.
The concentric termination s
assembly must be installed
before piping from the boiler to
the termination.
Support the termination at the ceiling s
and above the roof as shown in the
termination instructions.
Slope horizontal piping downward s
toward the boiler at least 1/4 inch per
foot.
Use long-radius elbows for air piping s
when using 2” or 3” pipe to reduce
pressure drop.
Rotate the concentric termination s
Y-fitting about 30° to result in pipe
centers the same as at the boiler.
3” or 4” PVC concentric termination Figure 15
supports
Alternate piping configuration, using (3) Figure 16
45-degree elbows to obtain closer pipe
centers