Prestige Venting Supplement

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CHAPTER 4
CHAPTER 4 - INSTALLATION REQUIREMENTS
4.3. Vent and Combustion Air Piping Installation
4.3.1 PVC/CPVC Vent System
1. The installer should install the vent / combustion air
piping working from the boiler to the piping termina-
tion. The piping length must not exceed the lengths
listed in Table 8 on page 9.
2. The installer should cut the pipe to the required length
and must deburr the inside and outside of both ends.
3. The installer must chamfer the outside of the pipe ends
to allow even distribution of cement when joining.
4. The installer must dry assemble the vent system
prior to nal assembly to ensure proper t.
5. The pipe ends and ttings must be cleaned and
dried thoroughly prior to nal assembly.
6. When assembling a joint the installer must:
a. Handle ttings and pipes carefully to prevent
contamination of surfaces
b. Apply a liberal amount of primer to both the end
of the pipe and the insert socket of the tting.
c. Apply a light uniform coating of approved ce-
ment to both the end of the pipe and the insert
socket of the tting, while the primer is still wet.
d. A second coat of approved cement should be
applied to the mating surfaces. The installer
should avoid, however, using too much cement
on the socket of the tting to prevent a buildup
of cement on the inside.
e. With the cement still wet, the pipe end should
be inserted into the socket of the tting and
twisted 1/4 of a full turn. Ensure the pipe end is
inserted fully into the socket of the tting.
f. Any excess cement should be wiped clean from
the joint. Inspect the joint to ensure a smooth
bead of cement is around the entire joint seam.
7. The installer must use perforated metal strap hang-
ers or equivalent pipe hangers suitable for plastic
pipe to support the piping. The hangers must be
placed at a maximum of every 5 feet [1.5 m] of hori-
zontal and vertical run of piping. A support must be
placed at the boiler and at every vertical or horizon-
tal change in direction (i.e elbow). Do not penetrate
any part of the piping or vent system with a fastener.
Failure to properly support vent system can
cause the venting system to fail, resulting in
substantial property damage, serious injury,
or death.
WARNING
Pipe hangers must not be tightly clamped to pipe
to allow for thermal expansion/contraction move-
ment. Pipe clamps or hangers should not contain
any sharp edges which can damage the pipe.
8. The vent and combustion air piping must be sloped
continuously from the termination back to the boiler
with at least 1/4” drop per foot [6 mm/30 cm] of run.
Do not allow any sags in the run of piping.
Do not slope the vent or combustion air pip-
ing downward away from the boiler. Conden-
sate could freeze and block the vent pipe or
damage the exterior of the building or sur-
rounding landscape, resulting in substantial
property damage, serious injury, or death.
9. Maintain a minimum clearance of 1/4” [6 mm]
between the vent pipe and all combustible or
non-combustible materials for 3” and 4” PVC/CPVC
vents or 1” [2.5 cm] for 2” PVC/CPVC vents. The install-
er must seal any wall, oor or ceiling penetrations as
per local code requirements.
It is recommended that the installer uses the
same number of elbows and length of pipes on
the venting and the combustion air inlet sys-
tems.
Covering PVC/CPVC or Polypropylene vent pipe
and fittings with thermal insulation is prohibited.
4.3.2 Polypropylene or Stainless Steel Vent Sys-
tems
• When using Polypropylene or Stainless Steel
Vent, refer to vent manufacturer’s installation
instructions supplied with the vent for proper in-
stallation.
• Covering Polypropylene vent pipe and fit-
tings with thermal insulation is prohibited.
NOTICE
WARNING
BEST PRACTICE
NOTICE
NOTICE