Navien NHB H Series Installation And Operation Manual page 80

Cutting and Assembling Common Vent
System Components
Standard tools are suitable for the cutting and
assembly of common vent system components.
Follow the guidelines listed below when working
with the components.
When cutting vent components, ensure that the
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cuts are straight. Chamfer and deburr all edges
before installing the components.
All vent joints must be fully tightened.
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Before operating the system, ensure that the
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Installed vent system is clean and free of debris.
Ensure that the vent system is rigidly supported
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according to the manual's instructions.
Selecting Vent Pipe Materials
Consult the following chart or the most recent
edition of ANSI Z223.1/NFPA 54, as well as all
applicable local codes and regulations when
selecting vent pipe materials. This appliance
should be vented with materials approved for
Category IV gas appliances. Do not use cellular
core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) for the exhaust vent. See below
for recommended vent materials.
Locale Recommended Vent Materials
PVC Schedule 40 (Solid Core)
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CPVC Schedule 40 or 80 (Solid Core)
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USA
Approved Polypropylene
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(Centrotherm Innoflue)
ULC-S636 Type BH Special Gas Vent
Class IIA (PVC)
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Class IIB (CPVC)
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Canada*
Class IIC (Centrotherm Innoflue/
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Approved Stainless Steel)
(Refer to page 61)
* 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.
80 Installing a Common Vent System
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 void the warranty and
certification of the boiler.
Vent Pipe Pitch and Supports
For horizontal runs, slope the horizontal section
upward toward the vent termination at a rate of
per foot (2% slope).
Connecting Pipes with Cement
WARNING
The vapors from primers and solvent cements
can make you dizzy and are dangerous to
your health. Ensure that the work area is well
ventilated, or wear an approved organic vapour
respirator when working with primers and
solvent cements.
To connect the vent pipes using cement:
1. Spread an even layer of solvent cement on the
inside of the pipe fitting and the outside of the
pipe.
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