Vertical Termination Installation - A.O. Smith BTH-120 Instruction Manual

Vertical termination installation

1. Determine the location for the termination(s).
note: The standard vent and intake air terminations are of
different design, see Figure 22.
2. If installing only the vent (exhaust) piping in a Power Vent
configuration vertically through the roof; ensure that all
exterior vertical clearance requirements shown in Figure
23 and Figure 24 on page 28 are being maintained. These
clearances and those cited by local and national codes must
be maintained.
note: On flat roof installations the vent termination must be
a minimum of 24 inches (60 cm) above any parapet, vertical
wall or structure within 10 feet (3 m) horizontally. See Figure
24 on page 28.
3. If installing both intake air and vent piping in a Direct Vent
configuration vertically through the roof; ensure that all
exterior vertical clearance requirements shown in Figure
23 and Figure 24 on page 28 are being maintained. These
clearances and those cited by local and national codes must
be maintained.
note: On flat roof installations the intake air and the vent
terminations must be a minimum of 24 inches (60 cm) above
any parapet, vertical wall or structure within 10 feet (3 m)
horizontally. See Figure 24 on page 28.
4. If installing only vent piping in a Power Vent configuration vertically
through the roof the following instructions must be followed:
The vent termination must be oriented facing downward as
shown in Figure 23 and Figure 24 on page 28.
The bottom edge of the vent termination must be a minimum
of 12 inches (30 cm), 18 inches (45 cm) in Canada, above
the average or expected snow level as shown in Figure 23
on page 28.
5. If installing both intake air and vent piping in a Direct Vent
configuration vertically through the roof the following
instructions must be followed:
The intake air and vent pipes must penetrate the same side
of the roof as shown in Figure 25 on page 28.
The intake air and vent terminations must be oriented facing
downward and in the same direction as shown in Figure 25
on page 28.
INTAKE AIR TERMINATION
45° ELBOW WITH
DOME SHAPED DEBRIS
SCREEN
STANDARD FACTORY SUPPLIED TERMINATIONS
The intake air and vent terminations must have a minimum
separation of 24" (61 cm) measured on center line as shown
in Figure 25 on page 28. In colder climates this separation
should be increased to at least 48 inches (122 cm).
The bottom edge of the intake air and vent terminations
must be a minimum of 12 inches (30 cm), 18 inches (45 cm)
in Canada, above the average or expected snow level as
shown in Figure 23 and Figure 25 on page 28.
6. When the intake air and/or vent piping from multiple
water heaters will terminate in the same location the vent
terminations can be grouped together in close proximity 0
inches/touching. Intake air terminations can also be grouped
together in close proximity 0 inches/touching.
The distance between the closest vent and intake air
terminations must be a minimum of 24 inches (61 cm)
as shown in Figure 25 on page 28. In colder climates
this separation should be increased to at least 48 inches
(122 cm).
7. Cut a 4 inch (10 cm) diameter hole for 3 inch pipe or 5 inch
(13 cm) diameter hole for 4 inch pipe where the pipe(s) will
pass through the roof.
note: Beware of concealed wiring and piping when cutting
through the roof.
8. Suspend the pipe(s) through center of hole using field
supplied metal strapping or equivalent support materials as
shown in Figure 23 on page 28.
9. Slide a roof boot or equivalent flashing over the pipe and
secure roof boot or equivalent flashing to roof and seal
around the flashing as shown in Figure 23, Figure 24 and
Figure 25 on page 28.
10. Install the factory supplied intake air and/or vent termination(s)
using field supplied pipe and one field supplied 90° elbow as
shown in Figure 23 on page 28. The short section of pipe
that connects between the field supplied 90° elbow and the
factory supplied termination must not be excessive in length.
The exposed portion of this pipe shall be no more than 2
inches (5 cm), see Figure 23 on page 28.
11. return to Power Vent Installation on page 25 or Direct
Vent Installation on page 25 to complete the installation of
the intake air and/or vent piping between the termination(s)
and the water heater.
figure 22
27
VENT TERMINATION
45° ELBOW WITH
RECESSED DEBRIS
SCREEN