Installation Of Vent System; Vent Terminal Installation, Sidewall; Sequence Of Installations, Figure 18A; Direct Venting - A.O. Smith RESIDENTIAL GAS WATER HEATERS Instruction Manual

InstallatIon of vent sYsteM

Before beginning installation of piping system thoroughly read
the section of this manual VENT PIPE PREPARATION.
If you are installing your system so that it vents through roof,
please refer to section titled INSTALLATION OF VERTICAL
VENT SYSTEM.

vent terMInal InstallatIon, sIdewall

1. Install the vent terminal by using the cover plate as a template
to mark the hole for the vent pipe to pass through the wall.
BEWARE OF CONCEALED WIRING AND PIPING INSIDE
THE WALL.
2. If the Vent Terminal is being installed on the outside of a
finished wall, it may be easier to mark both the inside and
outside wall. Align the holes by drilling a hole through the
center of the template from the inside through to the outside.
The template can now be positioned on the outside wall using
the drilled hole as a centering point for the template.
3. A) MASONRY SIDE WALLS
Chisel an opening approximately one half inch (1.3 cm) larger
than the marked circle.
B) WOODEN SIDE WALLS
Drill a pilot hole approximately one quarter inch (0.64 cm) outside
of the marked circle. This pilot hole is used as a starting point
for a saws-all or sabre saw blade. Cut around the marked
circle staying approximately one quarter inch (0.64 cm) outside
of the line. (This will allow the vent to easily slide through
the opening. The resulting gap will be covered up by the
Vent Terminal cover plate.) Repeat this step on inside wall if
necessary.

SEQUENCE OF INSTALLATIONS, FIGURE 18A

Cut a length of PVC pipe about 3.5 inches (8.9 cm) longer than the
wall thickness at the opening. Glue the vent terminal to this
section of pipe. Slide the wall plate over the pipe to stop against
the vent terminal. Place a bead of caulking (not supplied) around
the gap between the pipe and cover plate. Apply enough to
fill some of the gap between the pipe and wall. Place some of
the caulking on the back of the plate to hold it against the wall
after installation. If the vent pipe is installed up to the wall, with
a coupling on the end against the wall opening, the pipe with
the vent terminal can be prepared for gluing before inserting
through the wall. Slide the pipe through the wall and insert
into the coupling on the other side of the wall, making sure that
the vent terminal ends up pointed in the correct position, see
Figure 18A.
VENT TERMINATION - FIGURE 18A.

dIrect ventInG

The air intake provided on the unit contains a mesh screen to prevent
large particles from entering the unit.
WHEN THE UNIT IS TO BE SETUP AS A DIRECT VENT, THE
MESH SCREEN MUST BE REMOVED. THE INLET VENT PIPE
MAY THEN BE GLUED TO THE AIR INTAKE (See Figure 18B)
PROVIDED ON THE UNIT. THE SCREEN REMOVED FROM THE
INTAKE NEEDS TO BE INSERTED INTO THE 2" - 22.5 DEGREE
VENT TERMINAL SUPPLIED IN THE VENT TERMINAL KIT.
dIrect vent terMInal InstallatIon IMportant
THIS UNIT CONSISTS OF TWO VENT TERMINALS - AN INTAKE
VENT TERMINAL AND AN EXHAUST VENT TERMINAL. THE INTAKE
VENT TERMINAL IS A 2" 22.5° PVC ELBOW(-) WITH A MESH WIRE
SCREEN AND THE EXHAUST VENT TERMINAL IS A 2" 22.5° PVC
ELBOW WITH A MESH WIRE SCREEN.
NOTE: TO PREVENT EXHAUSTING PRODUCTS FROM
CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS,
THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO
TERMINALS IS RECOMMENDED.
WHEN LOCATING THE TERMINALS ON A SIDEWALL, THE
FOLLOWING SPECIFICATIONS PERTAINING TO TERMINAL
LOCATION MUST BE FOLLOWED.
1. The intake air terminal and the exhaust vent terminal must terminate
on the same exterior wall and must be separated by a minimum of
24" (61cm) on vertical centerline (see Figure 18C). In colder climates
increasing the 24" (61cm) minimum will reduce possibility of frost
over from side winds blowing exhaust vapors to the air intake of the
direct vent.
2. The horizontal centerline of the intake air terminal may not be located
lower than the horizontal centerline of the exhaust vent terminal (see
Figure 18C).
20
FIGURE 18B.
FIGURE 18C.