63
Venting for Combustion Air
Note
When you set PCB DIP SW2 (Set of 8
Switches) #8 to On, ensure that CPVC,
polypropylene or stainless steel piping
is used for exhaust venting.
1 2 3 4 5 6
O
N
O
N
1 2 3 4 5 6 7
8
CAUTION
●
This boiler has a built-in control to limit the
exhaust 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 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 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)
(Certified to
ULCS636)
2PPS-xxx (2”) or 3PPS-xxx (3“)
Centrotherm Innoflue® SW (Rigid)
(Certified to
UL1738 and ULCS636)
ISxx02xx (2”) or ISxx03xx (3”)
Duravent PolyPro® (Flexible)
(Certified to
ULCS636)
3PPS -FLEXxx (3”)
2PPS-FAM or 3PPS-FAM (2” or 3” Rigid-to-Flex Male
Adapter)
2PPS-X3L (2” to 3” Increaser)
Centrotherm Innoflue® (Flexible)
(Certified to
UL1738 and ULCS636)
IFVL02xxx (2”) or IFVL03x xx (3”)
IFSFC02 or IFSFC03 (2” or 3” Rigid-to- Flex Male
Adapter)
ISEI0203 or ISIA0203 (2” t o 3” Increaser)
5.4 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.
WARNING
Do not mix components from different systems.
The vent system may fail and harmful flue
products may leak into the living space. Mixing
of venting materials will void the warranty and
certification of the appliance.
Locale
Recommended Vent Materials
USA
●
PVC/CPVC Schedule 40 or 80 (Solid
Core)
●
UL1738 approved PVC or CPVC
●
Approved Polypropylene (PP)
●
Approved Stainless Steel (SS)
Canada*
●
Type BH Special Gas Vent Class IIA
(PVC)
●
Type BH Special Gas Vent Class IIB
(CPVC)
●
Type BH Special Gas Vent Class IIC
(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.
The vent system shall be installed in accordance
with the boiler manufacturer and, if applicable, the
venting system manufacturer’s instructions.
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 SW2 (Set of
8 Switches) #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.
Summary of Contents for NFB-175H
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