Navien NPE-180A2 Installation Manual page 53

WARNING
Carbon Monoxide Hazard
To prevent serious injury or death:
This water heater has a built-in control to
●
limit the exhaust temperature to 149°F. As
a result, the Navien water heater 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.
Only the vent pipe models listed
Note
●
above are approved for use with this
appliance.
Do not mix pipe, fittings, or
●
joint methods from different
manufacturers.
Refer to the vent manufacturer's
●
instructions for detailed installation
procedures and guidelines.
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")
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® SW (Rigid) (Certified to
●
UL1738 and ULCS636)
ISxx02xx (2") or ISxx03xx (3")
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" to 3" Increaser)
Hart & Cooley Polyflue™ SW (Rigid) (Certified to
●
ULCS636)
2PF-xx (2") or 3PF-xx (3")
Z-Flex® Z-DENS SW (Rigid) (Certified to UL1738
●
and ULCS636)
2ZDxx (2") or 3ZDxx (3")
The following stainless steel vent components are
approved for use with this appliance:
Duravent FasNSeal® (Rigid) (Certified to UL1738
●
and ULCS636)
FSA-PVC3 (3" PVC to FasNSeal Appliance Adapter)
FSxxxxx03 (3")
Duravent FasNSeal® (Flexible) (Certified to
●
UL1738 and ULCS636)
FSASMM-PP-2 (2" PP-to-FasNSeal adapter)
FSFLEX-02 (2")
Heat Fab Saf-T Vent® EZ Seal (Certified to
●
UL1738 and ULCS636)
9301PVC (3" PVC/CPVC Outlet Boiler Adapter)
93xx (3")
Z-Flex® Z Vent (Certified to UL1738 and ULCS636)
●
2SVSTTA023 (2" x 3" Appliance Adapter)
2SVEPSCF030X (Straight Pipe)
2SVEEWCF0390 (90° Elbow)
2SVEEWCF0345 (45° Elbow)
3.6.5 Measuring Vent Length
The maximum vent length when using 2 in. exhaust
ducts is 75 ft (23 m). The maximum vent length
when using 3 in. vent ducts is 150 ft (45 m). The
intake and exhaust vent pipes can be of different
lengths as the water heater will adjust for pressure
imbalances within the system. Maximum vent
length is reduced according to the number of
elbows used, as shown in the following table:
Installing the Water Heater 53