Venting - Rheem AP15317 Use And Care Manual

The water heater must be installed with a 3"/5" diameter UL approved Category III Concentric Stainless
Steel appliance concentric vent pipe or Rheem approved concentric vent pipe.
DANGER: Failure to
install the appliance vent
adapter and properly vent the
water heater to the outdoors
as outlined in the Venting
section of this manual will
result in unsafe operation of
the water heater, causing death,
serious injury, explosion,
or fire. 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 the
Venting section of this manual.
WARNING: Use only 3"/5"
UL approved Category III
Concentric Stainless Steel vent
material or Rheem approved
concentric vent material. No
other vent material is
permitted.
WARNING: Follow
concentric vent
manufacturer's installation
instructions and their
recommended clearances to
combustibles.
Number of Maximum
90° elbows Length of
(bends) Straight Pipe
1 39'
(12.0 m)
2 37' 6"
(11.5 m)
3 36"
(11.0 m)
4 34' 6"
(10.5 m)
5 33'
(10.0 m)
6 31'6"
(9.5 m)
AP15317 (10_09) DV Gas Manual 10 30 09.indd 9

Venting

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 connect this water heater to a
chimney. It must be vented separately from
all other appliances.
All concentric vent components (adapters,
pipe, elbows, terminals, etc.) should be
Rheem approved Stainless Steel Venting
Material
(e.g. A L29-­4C).
The specified vent termination must be used.
(Refer to pages 13 and 14 for an example of
the concentric vent.)
Use the screws provided to connect
the concentric vent pipe with the anti-­
disconnection joint.
The unit can be vented either horizontally
or vertically.
Concentric vent pipe runs must be
adequately supported along both horizontal
and vertical runs.
The maximum recommended unsupported
span should be no more than five (5) feet
(1.5 m). Support isolation hanging bands
should be used. DO NOT use wire. (See
diagram)
Venting Lengths
MAXIMUM VENT LENGTH:
The system will not operate if there is
excessive restriction (pressure drop) in the
venting system. A maximum 39'(12.0 m) of
vent pipe may be used provided there is only
one 90° elbow in the system. If additional
elbows are required: two elbows can be used
with 37' 6"(11.5 m), three elbows can be used
with 36' (11.0 m) or four elbows can be used
with 34' 6" (10.5 m) of vent pipe. (See table)
A 94° elbow is equivalent to 1'6" (.5 m) of
straight pipe. A 45° elbow is equivalent to
9" (.25 m) of straight pipe.
The vent termination does not count
in equivalent to pipe calculation when
determining total vent lengths.
The vent should be installed with a slight
downward slope of 1/4" per foot of
horizontal run toward the vent terminal (see
diagram). This ensures that any condensate
formed during operation of the unit is
evacuated from the appliance and to prevent
rain from entering the appliance.
An upward slope toward the vent terminal is
not acceptable for horizontal venting without
Notes on pre-­existing vent:
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 detailed in this Use and Care
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 the back page of this manual
for additional requirements for the
Commonwealth of Massachusetts.
NO!
installing the drain tube to the condensation
trap. For horizontal installation with less
than 10' (3.1m), a 94° elbow is required.
MINIMUM VENT LENGTH: The venting
may be as short as 12" (30cm), in addition
to installation of one 94° elbow and one
vent termination to the outdoors through a
side wall (Total equivalent vent length: 30"
(76cm)).
Notice: Make sure that the seam of the inner
vent pipe in horizontal runs is toward the top
of the installation (see diagram).
Vent Seam
YES!
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