35
INSTALLATION INSTRUCTIONS
Venting
NOTICE: To use 2-inch vent pipe, a reducing
adapter or bushing will be required.
WARNING:
To use Category III Stainless Steel, a proper transition
part will be required to prevent flue gas from leaking.
Depending on the size of pipe that is chosen for
venting the water heater, it might be necessary to use
a fitting for stepping down in pipe size, to connect to
the water heater.
All intake and exhaust venting components must have
the same diameter size. Do not use a different size on
the intake and exhaust venting.
The unit may be vented horizontally through a
wall or vertically through the roof. Pipe runs must
be adequately supported along both vertical and
horizontal runs. Maximum unsupported span is
recommended to be no more than 4 feet (1.2 m). It
is imperative that the first hanger be located on the
horizontal runs immediately adjacent to the first
90-degree elbow from the vertical rise. Only use
support isolation hanging bands. DO NOT use wire to
support pipe runs.
Stress levels in the pipe and fittings can be
significantly increased by improper installation. If
rigid pipe clamps are used to hold the pipe in place,
or if the pipe cannot move freely through a wall
penetration, the pipe may be directly stressed, or high
thermal stresses may be formed when the pipe heats
up and expands. Install accordingly to minimize such
stresses.
Preexisting Venting Notes:
If the water heater is being installed as a replacement
for an existing water heater, a thorough inspection
of the existing venting and air intake system must be
performed prior to any installation work. Verify that the
correct materials, vent lengths, and terminal locations
as described in this manual have been met. Carefully
inspect the entire venting and air intake system for any
signs of cracks or fractures, particularly at the joints
between elbows or other fittings and the straight runs
of vent pipe. Check the system for signs of sagging or
other stresses in the joints as a result of misalignment
of any components in the system. If any of these
conditions are found, they must be corrected in
accordance with the venting instructions in this manual
before completing the installation and putting the water
heater into service.
NOTICES:
• I t is recommended that the air intake and exhaust
pipes have a 1/4" per foot downward slope toward
the outdoors.
• Maintain the proper clearance between the vent pipe
and combustible or noncombustible materials are
described on pages 28, 29.
• A zero clearance 0 in.(0cm) is allowed between the
air intake pipes and combustible material.
• Use proper support for the vent and air intake pipes.
• I t is recommended the support method used isolates
the vent pipe from floor joists or other structural
members. This helps prevent transmission of noise
and vibration.
• D o not support, pin, or otherwise secure the venting
system in a way that restricts the normal thermal
expansion and contraction of the chosen venting
material.
See page 36 for additional requirements for the
Commonwealth of Massachusetts.
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