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INSTALLATION
!
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.
Where using non-metallic flue gas
vent materials ensure the maximum
temperature of the material is not
exceeded. Typical material ratings
are 149°F (65°C) for PVC, 194°F (90°C)
for CPVC, and 230°F (110°C) for
Polypropylene. Verify ratings with your
supplier to ensure material selections are
appropriate for the application. Typical
flue gas exhaust temperatures range from
0°F to 30°F (17°C) above return (boiler
inlet) water temperature, this range may
vary based on commissioning settings and
site conditions.
4
CAUTION
Do not use insulation on non-metallic flue
gas vent materials. Use of insulation may
elevate pipe wall temperatures, resulting in
the potential for vent material failure.
2-22
7. Air Intake pipes and fittings shall be Schedule 40 PVC pipe or smooth-
walled galvanized steel. All Schedule 40 PVC pipe, fittings, primer and
cement must conform to American National Standard Institute and the
American Society for Testing and Materials (ANSI/ASTM standards) per pipe
manufacturer's requirements.
8. Intake PVC piping must be assembled using cement. This will ensure that
the intake is air tight and will not allow contaminates from the boiler room
into the boiler. The cement must be free flowing and contain no lumps,
undissolved particles or any foreign matter that adversely affects the joint
strength or chemical resistance of the cement. The cement must not show
gelation, stratification, or separation that cannot be removed by stirring.
9. Adhere to procedure for cementing joints (per ASTM D2855).
10. Avoid sidewall exhaust with roof terminated intake air. This may lead to
reverse stack effect when the boiler is idle.
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 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 first 8 inches of pipe must be Schedule 40 CPVC. 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. The use of cellular core PVC/CPVC or Radel® (polyphenylsulfone) in venting
systems is prohibited.
4. Do not use boot tees or bullhead tees. Use inline condensate drains in
place of boot tees at the bottom of a vertical rise.
5. 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 flue 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 Carbon Monoxide
detector are installed and interlocked with the boiler(s). Barometric
dampers must never be used in a positive pressure (Category IV) exhaust
or ducted combustion air application.
SECTION 2
EXE-IOM-230112
© Fulton Group N.A., Inc. 2023
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