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Part 5 - Venting
The boiler must be vented as detailed in this section. Ensure
exhaust vent and intake piping complies with these instructions
regarding vent system. Inspect finished exhaust vent and intake
piping thoroughly to ensure all joints are well secured, airtight,
and comply with all applicable code requirements, as well as the
instructions provided in this manual. Failure to properly install the
vent system will result in severe personal injury or death.
A. General
This boiler is certified as a "Category IV" appliance and requires
a special venting system. The vent system will operate with a
positive pressure in the pipe. Exhaust gases must be piped directly
outdoors using the vent materials and rules outlined in these
instructions. Do not connect vent connectors serving appliances
vented by natural draft into any portion of mechanical draft
systems operating under positive pressure. Follow the venting
instructions carefully. Failure to do so will result in substantial
property damage, severe personal injury, or death.
1. Installation should be made in accordance with the regulations of
the Authority Having Jurisdiction, local code authorities, and utility
companies which pertain to this type of water heating equipment.
2. Install the venting system in accordance with these instructions
and with the National Fuel Gas Code, ANSI Z223.1/NFPA 54, CAN/
CGA B149, and / or applicable provisions of local building codes.
3. This boiler must be vented with materials, components, and
systems listed and approved for Category IV appliances.
Exhaust and intake are to be piped separately. This boiler cannot
share a common exhaust or intake with multiple appliances.
Failure to follow these instructions will result in substantial
property damage, severe personal injury, or death.
NOTE: To avoid contamination often contained in indoor air, it is
best to pipe all intake combustion air directly to the outdoors.
NOTE: Care must be taken to prevent condensate freezing in the
exhaust vent pipe system. See local, state, provincial, and national
codes for best practices to prevent condensate freezing in the
exhaust vent pipe system.
Improper seating of vent pipe gaskets can cause eventual gasket
failure and exhaust gas leakage. Ensure the exhaust vent pipe is
properly beveled and seated before insertion into the flue adapter.
Failure to do so could result in property damage, severe personal
injury, or death.
Exhaust vent adaptors are not designed as load-bearing devices,
and must not be used to support exhaust vent piping. All vent
pipes must be properly connected, supported, and the exhaust
vent must be pitched a minimum of 1/4" per foot back to the boiler
to allow drainage of condensate. Failure to properly support vent
piping and follow the information in this statement could result in
product damage, severe personal injury, or death.
It is required to insert exhaust and intake screens into the vent
terminations to prevent blockage caused by debris or birds. Failure
to keep terminations clear could result in property damage, severe
personal injury, or death.
Due to the extreme flammability of most glues, cements, solvents,
and primers used to join plastic exhaust vent and intake pipes,
explosive solvent vapors must be cleared from all vent piping before
start-up. Avoid using excess cement or primer, as this may pool in the
vent pipes. Vent assemblies should be allowed to cure for a period of
at least 8 hours before powering a connected appliance. Failure to
follow these instructions will result in substantial property damage,
severe personal injury, or death. It is the installers' responsibility to
understand the hazards associated with explosive solvents and take
the necessary precautions to avoid these risks.
• DO NOT insulate the first three (3) linear feet of the exhaust vent
run.
• CPVC, Polypropylene, or Stainless
Steel pipe material MUST be used
if the first three (3) linear feet of
the exhaust vent run is insulated or
passes through an enclosed space
greater than 6" in length, such as a
wall. NOTE: Only Stainless Steel pipe
material may be insulated.
• If CPVC is used to meet these
requirements, the balance may be
installed with approved PVC pipe.
• If Polypropylene or Stainless Steel is used to meet these
requirements, the balance of the vent run must be installed with
the same material.
• Failure to comply with this warning could result in property
damage, severe personal injury, or death.
whl-428-r1 Rev. 001 Rel. 012 Date 7.21.20
23
Within First Three (3) Linear Feet of
Appliance Exhaust Vent Adapter
Enclosed
Space
Length
Greater than
Six (6) Inches
Exhaust
LP-179-JJ
11/30/17
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