Questions? Please Contact Your Local Manufacturer’s Representative
2-27
SECTION 2 EDR-SOLA-IOM-2022-0216 INSTALLATION
Flue Gas Exhaust Venting
This boiler is equipped with a vent connection at the lower rear of the boiler.
Adhere to National Fuel Gas Code (ANSI Z223.1) and the following for installation:
1. This boiler is a Category II/IV appliance, thus requiring special gas vent
material appropriate for condensing, positive pressure applications.
Any venting material supplied for the Endura boiler must be AL29-4C or
316L/444 SS, listed and labeled to UL 1738, and guaranteed appropriate for
the application by the manufacturer and supplier of the venting. It is also
acceptable to vent as Category II condensing, negative pressure, for which
an upsized diameter is typically required.
2. Where allowed by the authority having jurisdiction (AHJ), the exhaust may
be vented using Schedule 40 PVC, Schedule 40 CPVC, or Polypropylene
listed and labeled to UL 1738 or ULC S636. If venting with Schedule 40
PVC, at minimum the rst 8 inches of pipe must be Schedule 40 CPVC, see
Figure 19 and Table 8. Do not insulate plastic exhaust vents. Canada only:
Schedule 40 PVC, CPVC, or Polypropylene vent materials must be listed and
labeled to ULC S636.
3. Do not use boot tees or bullhead tees. Use inline condensate drains in
place of boot tees at the bottom of a vertical rise.
4. Barometric dampers are physically open to the mechanical space. When
used in a condensing boiler application with negative pressure (Category
II) exhaust vent, the design must prevent ue gas condensate from
draining down the outside of the stack or dripping into the space. For
installation using a barometric damper, verify the air openings meet the
requirements in Table 6, and a spill switch and a CO2 detector are installed
and interlocked with the boiler(s). Barometric dampers must never be
used in a positive pressure (Category IV) exhaust or direct vent sealed
combustion application.
5. Refer to Table 7 for acceptable vent materials and temperature limits. The
use of cellular core PVC/CPVC or Radel® (polyphenylsulfone) in venting
systems is prohibited.
6. A stainless steel adapter (not supplied) specic to vent manufacturer
type and material will be required. See Table 8 and Figure 19. Consult the
venting supplier for guidance.
7. Adequate provision must be made to support the weight of the exhaust
venting. It must not be supported by the boiler exhaust connection.
8. Following the venting manufacturer’s instructions for installation of ue
gas venting.
9. Horizontal runs must allow for ue gas condensate to drain back with a
minimum upward pitch of ¼” (7 mm) per foot (300 mm) run. Failure to
do so can create a condensate pocket, which can result in an inoperative
boiler. There must be no low spots in the exhaust vent, as this can also
result in a condensate pocket.
! WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
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