A.O. Smith 300 Series, Инструкция по эксплуатации

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25
PLANNING THE VENT SYSTEM
Do not locate the vent termination over public walkways or a public
area where condensate or vapor can cause a nuisance or ice hazard.
Plan the route of the vent system from the exhaust elbow to the
planned location of the vent terminal. Water heaters covered by
these instructions are Category IV appliances.
1. Layout total vent system to use a minimum of vent pipe and
elbows.
2. This water heater is capable of venting flue gases in
equivalent feet of pipe as listed in Table 6
.
Table 6. Table 7 Max Pipe Lengths Per Number of 90° Elbows
Number of
90° Elbows
2” Maximum
Pipe - ft. (m)
3” Maximum
Pipe - ft. (m)
1
40 (12.19) 120 (36.57)
2
35 (10.66) 115 (35.05)
3
30 (9.14) 110 (33.52)
4
25 (7.62) 105 (32)
5
20 (6.09) 100 (30.48)
6
15 (4.57) 95 (28.95)
The minimum vent length for each of the pipe size is one 90° elbow
plus 2’ and 7’ (0.61 m and 2.1 m) of straight pipe for air intake and
exhaust vent respectively and the appropriate termination.
Note: The equivalent feet (m) of pipe listed above are exclusive
of the termination. That is, the termination, with an installed
screen, is assumed to be in the system and the remainder
of the system must not exceed the lengths and number of
elbows shown in Table 6
.
Note: If using 2” inch vent pipe: A 2” diameter vent pipe must be
inserted and fastened to the exhaust elbow assembly.
Note: If using 3” inch vent pipe: Two inches (5.1cm) of 2” diameter
pipe must be inserted and fastened to the exhaust elbow
assembly before adding a 2’ x 3” reducer to acquire the
desired pipe diameter. A 3” coupling (supplied locally-a
schedule 40 DWV) vent terminal must be obtained. A 3”
diameter screen is supplied in the vent kit.
INSTALLATION OF HORIZONTAL THROUGH THE WALL
VENT SYSTEM
If you are installing your system so that it vents through roof, see
Vertical Vent Terminal Installation
(page 26)
.
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.
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 wall plate.) Repeat this step on inside wall if necessary.
Cut a length of 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 17
(page 25)
.
Figure 17. Through-the-Wall Vent Termination Installation
DIRECT VENT TERMINAL INSTALLATION
The air intake provided on the unit contains an air intake screen to
prevent large particles from entering the unit.
Figure 18. Air Intake Screen
When the unit is to be set up as a direct vent, the air intake screen
must be removed. The air intake pipe may then be glued to the air
intake provided on the unit. See Figure 18
This unit consists of two terminals - an air intake terminal and an
exhaust vent terminal. The air intake terminal is a 2” 90° pvc elbow
with an air intake screen and the exhaust vent terminal is a 2” straight
pvc coupling with a mesh wire screen.