34
Venting for Direct-Vent Water Heater
INSTALLATION INSTRUCTIONS
The water heater must be installed with
3-in./5-in. (7.6-cm/12.7-cm) diameter UL-approved
Category III Coaxial Stainless Steel appliance vent pipe or
water heater manufacturer-approved concentric vent pipe.
DANGER:
Failure to install and properly
vent the water heater to the outdoors as outlined in this
Venting section will result in death or serious personal
injury. To avoid the risk of fire, explosion, or asphyxiation
from carbon monoxide, NEVER operate the water heater
unless it is properly vented and has adequate air supply
for proper operation as outlined in this Venting section.
WARNINGS:
• Use 3-in./5-in. (7.6-cm/12.7-cm) UL-approved Category
III Stainless Steel vent materials or water heater
manufacturer-approved vent material. No other vent
material is permitted for use with this appliance.
• Refer to page 29 for required clearances to combustible
materials. Improper clearances can cause explosion or
fire resulting in death, personal injury, and/or product
damage.
Venting Requirements
The installation of venting must comply with national
codes, local codes, and the vent manufacturer’s
instructions.
The water heater must be vented to the outdoors as
described in these instructions. DO NOT vent this water
heater through a chimney. It must be vented separately
from all other appliances.
All inner coaxial vent components (adapters, pipe,
elbows, terminals, etc.) should be water heater
manufacturer-approved Stainless Steel Venting Material
(e.g., 444 SS, 316 L).
Outer casing can be galvanized aluminum or other
material.
The specified vent termination must be used. (Refer to
page 45 for an example of concentric vent.)
CAUTION
:
DO NOT
attempt to fabricate or
adapt other vent pipe or materials to this venting.
Use the provided screws to connect the coaxial vent pipe
together.
Follow the vent manufacturer’s installation instructions.
This water heater can be vented horizontally or vertically.
All coaxial vent piping runs must be adequately
supported. The maximum recommended unsupported
span should be no more than 4 ft. (1.2 m). Only use
support isolation hanging bands. DO NOT use wire to
support pipe runs.
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.
See page 35 for additional requirements for the
Commonwealth of Massachusetts.
Venting
