American Water Heater 316888-004 - Manual (Page 24)

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Vent piping must slope up
from heater to termination a
minimum of 1/8 in. (0.3cm)
rise per 4 ft. (1.2m) of vent
piping
TERMINATION
ELBOW
RODENT SCREEN
(INSTALL INTO
ELBOW)
GROUND LEVEL OR
MAXIMUM SNOW
LINE*
STRAP
6 in.
(15cm)
MIN.
90°
ELBOW
Example for calculating equivalent feet.
Section “A” . . . . 0.5 ft. . . (0.15m)
90° elbow . . . . . 7.0 ft. . . (2.13m)
Section B . . . . . 1.0 ft. . . (0.31m)
45° elbow . . . . . 4.0 ft. . . (1.21m)
Section C . . . . . 1.5 ft. . . (0.46m)
45° elbow . . . . . 4.0 ft. . . (1.21m)
Section D . . . . . 15.0 ft. . (4.57m)
Total Equivalent 33.0 ft. . (10.04m)
Based on this example use the (fully open) rodent
screen for vent length greater than 20 equivalent
ft. (6.1 equivalent metres).
45°
ELBOW
NOTE: VENT PIPE MUST BE SUPPORTED EVERY 4 ft. (1.2m). TO PREVENT VIBRATION, USE
ISOLATION PADS WHEN ATTACHING STRAPS TO FLOOR JOISTS, WALLS OR CEILINGS.
FIGURE 21
If using 3 inch vent pipe:
Install the rubber reducing coupling (2 in. to 3 in.) and
gear clamps (supplied) at the end of the section of
vent pipe installed on the heater. Continue building
the vent system, or connect the existing vent system
to the coupling. The total system must not exceed
the equivalent pipe lengths discussed above where
each (long radius) elbow is equal to 5 ft. (1.5m) of 3
in. diameter straight vent pipe. The elbow and rodent
screen supplied in the vent kit must be used as the vent
termination.
NOTE: This unit can be vented with PVC pipe materials
(DWV ASTM-D2665; Schedule 40, 80, 120 ASTM-
D1785; or SDR Series ASTM-D2241), CPVC pipe
materials (CPVC41 ASTM-D2846; Schedule 40, 80
ASTM-F441; or SDR Series ASTM-F442), ABS pipe
materials (Schedule 40 DWV ASTM-D2661). The
fittings, other than the TERMINATION should be
equivalent to PVC-DWV fi ttings meeting ASTM D-2665
(Use CPVC fi ttings, ASTM F-438 for CPVC pipe and
ABS fi ttings, ASTM D-2661/3311 for ABS pipe). If CPVC
or ABS pipe and fi ttings are used, then proper cement
must be used for all joints, including joining the pipe to
Termination (PVC Material). If local codes do not allow
the use of the PVC termination when a material other
than PVC is used for venting, then an equivalent fi tting
of that material may be substituted if the screen in the
PVC terminal is removed and inserted into the new
fi tting.
This water heater is supplied with a 45 degree
termination elbow that is a special fi tting that must be
used with the appliance.
PVC Materials should use ASTM D-2564 Grade
Cement; CPVC Materials should use ASTM F-493
Grade Cement and ABS Materials should use ASTM
D-2235 Grade Cement.
If the water heater is being installed as a replacement
for an existing power vented heater in pre-existing
venting, a thorough inspection of existing venting
system must be performed prior to any installation work.
Verify that correct material as detailed above has been
used, and that the minimum or maximum vent lengths
and terminal location as detailed in this manual have
been met. Carefully inspect the entire venting system
for any signs of cracks or fractures, particularly at joints
between elbows and other fi ttings and straight runs of
vent pipe. Check system for signs of sagging or other
stresses in 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 installation and putting the water heater
into service.
NOTE: (A.) For water heaters in locations with high
ambient temperatures (above 100°F (38°C)) it is
recommended that CPVC or ABS pipe and fi ttings be
used. (B.) A 22.5 degree elbow (2 in. vent pipe) or a 45
degree elbow (3 in. vent pipe) with an installed screen
VENT TERMINAL must be used in all cases.
4. There will be some installations where condensate will
be formed in the horizontal runs of the vent system.
This condensate will run into the condensate trap. The
water heater is shipped with a condensate tube that
attaches to the condensate trap. No other tee or fi tting
is required.