INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater
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:
• It is recommended that the air intake pipe and exhaust
pipe have a 1/4" per foot upward slope toward the
outdoors.
• If the air intake pipe has an upward slope towards the
outdoors, it is required to install a condensate trap
as close as practical to the water heater. A similar
condensate trap as described on "condensate trap" is
allowed as long as it prevents rain, condensate or any
other liquid from entering into the water heater. Without a
proper condensate trap, property damage will occur.
• Maintain the proper clearance between the vent pipe and
combustible or noncombustible materials as described on
pages 28 and 29.
• A clearance of 0 in. (0 cm) is allowed between the vent or
air intake pipe and combustible material.
• Use proper support for the vent and air intake pipes.
• It 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.
• DO 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 37 for additional requirements for the
Commonwealth of Massachusetts.
Venting
36
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