Technical Specifications
whl-648 Rev. 000 Rel. 003 Date 3.6.18
29
Part 5 - Venting
The appliance must be vented as detailed in this section. Ensure
exhaust vent and intake piping complies with these instructions
regarding vent system. Inspect nished 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 appliance is certied 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.
Exhaust and intake are to be piped separately. This appliance
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.
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 appliance must be vented with materials, components, and
systems listed and approved for Category IV appliances.
NOTE: To avoid contamination often contained in indoor air, it is
best to pipe all intake combustion air directly to the outdoors.
NOTE: If exhaust vent pipe system passes through an unheated
space such as an alcove or attic, the space must be heated.
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 ue adapter.
Failure to do so could result in property damage, severe personal
injury, or death.
Due to the extreme ammability 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.
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 appliance 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.
t DO NOT insulate the rst three (3) linear feet of the exhaust vent
run.
t CPVC, Polypropylene, or Stainless
Steel pipe material MUST be used
if the rst 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.
t If CPVC is used to meet these
requirements, the balance may be
installed with approved PVC pipe.
t If Polypropylene or Stainless Steel
is used to meet these requirements, the balance of the vent run
must be installed with the same material.
t Failure to comply with this warning could result in property
damage, severe personal injury, or death.
Exhaust
LP-179-JJ
11/30/17
Length
Greater than
Six (6) Inches
Enclosed
Space
Within First Three (3) Linear Feet of
Appliance Exhaust Vent Adapter