Selecting Vent Pipe Materials - Navien NFC-175 Installation & Operation Manual

5.2 Selecting Vent Pipe Materials

Venting requirements differ in the US and Canada. Consult the
following chart or the most recent edition of ANSI Z223.1/NFPA
54 or CAN/CGA B149.1, as well as all applicable local codes and
regulations when selecting vent pipe materials. Do not use
cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) for the exhaust vent.
Locale Recommended Vent Materials
PVC/CPVC Schedule 40 or 80 (Solid Core)
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USA Approved Polypropylene (PP)
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Approved Stainless Steel (SS)
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Type BH Special Gas Vent Class IIA (PVC)
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Type BH Special Gas Vent Class IIB (CPVC)
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Canada*
Type BH Special Gas Vent Class IIC
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(Polypropylene/Stainless Steel)
* For installation in Canada, field-supplied plastic vent piping must comply
with CAN/CGA B149.1 (latest edition) and be certified to the Standard
For Type BH Gas Venting Systems, ULC-S636. Components of this listed
system must not be interchanged with other vent systems or unlisted
pipes or fittings. All plastic components and specified primers and glues
of the certified vent system must be from a single system manufacturer
and must not be intermixed with another system manufacturer's parts.
The supplied vent connector and vent termination are certified as part of
the boiler.
This product is set to use PVC as the default vent pipe material. If
you require that return water hotter than 140°F (60°C) to circulate
back to boiler, the DIP switch must be configured (Dip Switch 2,
switch #8 to ON position). Otherwise, the boiler will control and
maintain the flue and DHW temperature below 150°F (65°C) and
140°F (60°C) respectively.
When you set PCB DIP switch 2 #8 to On, ensure that
Note
CPVC, polypropylene or stainless steel piping is used
for exhaust venting.
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1
56 Venting the Boiler
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2 3 4 5 6 1 2 3 4 5 6 7 8
CAUTION
This boiler has a built-in control to limit the exhaust
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temperature to 149°F (65°C). As a result, the boiler can be
vented with Schedule 40 PVC.
In high temperature applications, the exhaust temperature
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can exceed 149°F (65°C). In that case, you must use Schedule
40/80 CPVC or Approved Polypropylene/Stainless Steel in
the USA or Type BH Special Gas Vent Class IIB (CPVC) or Class
IIC (Polypropylene/SS) that conforms to ULC-S636 in Canada.
When using 2 in. vent, if the exhaust temperature exceeds
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149°F (65°C), CPVC pipe (field supplied) must be used for the
first 3 feet of equivalent pipe length. For systems using 3 in.
vent, the first 5 in. of length must be CPVC pipe.
The following polypropylene vent components are approved for
use with this appliance:
Duravent PolyPro® SW (Rigid)
2PPS-xxx (2") or 3PPS-xxx (3")
Centrotherm Innoflue® SW (Rigid)
ISxx02xx (2") or ISxx03xx (3")
Centrotherm Innoflue® (Flexible)
IFVL02xxx (2")
IFSFC02 (2" Rigid-to-Flex Male Adapter)
Hart & Cooley Polyflue™ SW (Rigid)
2PF-xx (2") or 3PF-xx (3")
Z-Flex Z-DENS SW (Rigid)
2ZDP___ (2" or 3")
The following stainless steel vent components are approved for
use with this appliance:
Duravent FasNSeal® (Rigid)
FSA-PVC3 (3" PVC to FasN Seal Appliance Adapter)
FSxxxxx03 (3")
Heat Fab Saf-T Vent® EZ Seal
9301PVC (3" PVC/CPVC Outlet Boiler Adapter)
93xx (3")
Only the vent pipe models listed above are
Note
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approved for use with this appliance.
Proper appliance adapters must be used when
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using polypropylene or SS vent pipe.
Refer to the vent manufacturer's instructions for
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detailed installation procedures and guidelines.
Do not use Schedule 40 or 80 polypropylene pipe
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used for water or waste systems within the vent
run.