Navien NPE-180A2 Installation Manual page 52

3.6.4 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,
Radel® (polyphenylsulfone) for the exhaust vent.
WARNING
Carbon Monoxide Hazard
To prevent serious injury or death:
ONLY use approved venting materials.
●
NEVER mix different types of vent pipe
●
materials. The vent system may fail and harmful
flue products may leak into the living space.
The use of more than one type of pipe for the
vent piping will also void the warranty and
certification of the water heater.
Locale Recommended Vent Materials
PVC/CPVC Schedule 40 or 80
●
(Solid Core)
UL1738 approved PVC or CPVC
USA
●
Approved Polypropylene (PP)
●
Approved Stainless Steel (SS)
●
Type BH Special Gas Vent Class
●
IIA (PVC)
Type BH Special Gas Vent Class
●
Canada*
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 water heater.
The vent system shall be installed in accordance
with the water heater manufacturer and, if
applicable, the venting system manufacturer's
instructions.
52 Installing the Water Heater
This product is set to use PVC as the default vent
pipe material. If the return water temperature for the
application is higher than 140°F (60°C) to circulate
back to water heater, Exhaust Limit Control
(parameter settings) must be set to OFF. Otherwise,
the water heater will control maintain the exhaust
and DHW temperatures below 150°F (65°C) and
140°F (60°C) respectively.
To change the Exhaust Limit Control parameter
setting, press and hold the Menu button (
the Back button ( ) simultaneously for 3 seconds
to access the Service/Installer menu. Then select
1. Installer Menu > 2. Parameter Settings > 6.
Exhaust Limit Control by pressing the OK button
( ).
When Exhaust Limit Control
Note
●
(parameter settings) is set to Disable
(the factory default is Enable), CPVC,
PP, or SS vent must be used for the
exhaust pipe.
For more information about the
●
Parameter settings, refer to "6.8
Maintenance" on page 87.
) and