Venting Installation Sequence; Power Vent Installation; Direct Vent Installation - A.O. Smith 101 Series Instruction Manual

Venting installation seQuence

1. read the General Venting instructions on page 21 and
Venting requirements on page 22 before proceeding. These
instructions and requirements must be followed on all
installations.
2. Determine whether the water heater will be installed in
a Power Vent or Direct Vent configuration and which vent
system arrangement will be used for the installation. See the
various venting arrangements on pages 32 and 33.
3. Proceed to the applicable installation instructions that follow;
Power Vent installation or Direct Vent installation.

power Vent installation

1. read the General Venting instructions on page 21 and
Venting requirements on page 22 before proceeding. These
instructions and requirements must be followed in addition
to the instructions below that are specific for Power Vent
configurations.
2. Determine which Power Vent arrangement will be used for
the installation; vertical or horizontal termination. See Figure
40 and Figure 41 on page 32.
3. Determine the vent pipe size for the installation, see Venting
Requirements on page 22.
4. Plan the layout of the vent piping backwards from the
termination point outdoors to the water heater. Layout the
vent piping to use a minimum of pipe and elbows.
5. install the termination first.
if the vent piping will terminate vertically, through a roof, see
Vertical Termination installation on page 24.
if the vent piping will terminate horizontally, through a
sidewall, see Sidewall Termination installation on page 26.
6" PIPE FIELD
SUPPLIED
6" x 4" REDUCER
FIELD SUPPLIED
4" PIPE FIELD
SUPPLIED
EXHAUST ELBOW
VENT CONNECTION
FACTORY INSTALLED
VENT (EXHAUST) CONNECTION
6. When installation of the termination is complete install
necessary piping and fittings to route the vent piping back to
the water heater.
7. The vent pipe must be supported properly to avoid bending
or failure. The water heater manufacturer recommends that
the vent pipe be supported every 5 feet (152 cm) of vertical
run and every 3 feet (91 cm) of horizontal run.
8. Do not install the vent piping in a manner that will allow water
to be trapped in the piping.
9. All vent (exhaust) pipes must be pitched a minimum of a 1/4
inch per foot back to the water heater (to allow drainage of
condensate).
10. if installing 4 inch vent pipe connect the vent pipe to the
figure 15
exhaust elbow on the water heater.
11. if installing 6 inch pipe transition to 4 inch pipe as shown in
Figure 15. The field installed 4" pipe between the exhaust
elbow and the 6" x 4" reducer coupling should be 18 inches
(45 cm) or less in length.

direct Vent installation

1. read the General Venting instructions on page 21 and
Venting requirements on page 22 before proceeding. These
instructions and requirements must be followed in addition
to the instructions below that are specific for Direct Vent
configurations.
2. Determine which Direct Vent arrangement will be used for
the installation. There are six (6) Direct Vent arrangement
options, see pages 32 and 33.
3. Determine vent and intake air pipe size to be used for the
installation; see Venting requirements on page 22.
4. Plan the layout of the vent and intake air piping backwards
from the termination point outdoors to the water heater.
Layout the vent and intake air piping to use a minimum of
pipe and elbows.
5. install the terminations first.
if standard terminations are being used and the intake air
or vent piping will terminate vertically, through a roof, see
Vertical Termination installation on page 24.
if standard terminations are being used and the intake air or
vent piping will terminate horizontally, through a sidewall, see
Sidewall Termination installation on page 26.
if a concentric termination(s) will be used see Concentric
Termination Installation on page 27.
6. When installation of the termination(s) is complete install
necessary piping and fittings to route the intake air and vent
piping back to the water heater.
7. The intake air and vent piping must be supported properly
to avoid bending or failure. The water heater manufacturer
recommends that the vent and intake air piping be supported
every 5 feet (152 cm) of vertical run and every 3 feet (91 cm)
of horizontal run.
8. Do not install the vent or intake air piping in a manner that will
allow water to be trapped in the piping.
9. A field supplied condensate Tee fitting and drain hose should
be installed in the intake air piping near the water heater in
colder climates with heavy snow accumulations and in areas
that regularly experience high humidity. The drain hose
should be routed to an adequate floor drain separate from
any other condensate drains. See Figure 16 on page 24.
note: Snow being pulled into the intake air piping and then
melting can lead to excessive amounts of water accumulation
and damage water heater components. Warm, humid outdoor
air can lead to excessive condensation inside the intake air
piping and may also damage water heater components.
10. All vent (exhaust) pipes must be pitched a minimum of a 1/4
inch per foot back to the water heater (to allow drainage of
condensate).
11. if installing 4 inch vent pipe connect the vent pipe to the
exhaust elbow on the water heater.
12. if installing 6 inch vent pipe transition to 4 inch pipe at the
exhaust elbow on the water heater as shown in Figure 15.
The field installed 4" pipe between the exhaust elbow and
the 6" x 4" reducer coupling should be 18 inches (45 cm) or
less in length.
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