High Ambient Temperature Installations; Polypropylene Vent Systems - Kenmore 153.331350 Use & Care Manual

Figure 20 shows examples of good venting
assembly practice. Table 1 lists the allowable
vent materials and sizing information. Figure 24
shows the general venting layout while Figures
30-32 show various end termination details and
clearances. Connection of the venting piping to the
blower is shown in Figures 33-36.
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 in below, has been used, and that the
minimum or maximum vent lengths and terminal
location as detailed in this manual have been met.
High Ambient Temperature Installations
This heater requires room air to lower the flue gas
temperatures before the gases pass through the
vent system. The dilution air inlets are located on
the rear of the blower assembly (see Figure 21).
As the room temperature rises, the ability to lower
the flue gases lessens so special attention to the
choice of venting material is required. Establishing
the ambient temperatures where the heater and
the venting is installed is very important, especially
in regions with warmer climates or any region that
experiences hot summers. Ambient conditions
hotter than 110°F (43°C) require that the venting
material be either CPVC or polypropylene. Areas
that can experience high ambient environments
include closets, alcoves, areas under staircases,
attics-especially in metal roofed buildings, areas
with restricted air movement, rooms with large
solar gains, metal sheds, industrial or commercial
enterprises and venting systems exposed to direct
sunlight. Ensuring adequate ventilation air will
help minimize heat buildup. For high temperature
environments, obtain high limit switch upgrade Kit #
9008306015 and use the higher rated vent piping.
NOTE: This unit
piping:
can be vented with the following
DWV ASTM-D2665
Schedule 40, 80* & 120*ASTM-
D1785, SDR Series ASTM-
D2241
CPVC 41 ASTM-D2846
Schedule 40, 80* & 120*ASTM-
F441
SDR Series ASTM-F442,
DWV ASTM-D2661
Schedule 40
UL-1738
* USING SCHEDULE 80 OR 120
SIGNIFICANTLY REDUCES THE VENT
LENGTH.
The fittings, other than the Termination should be
equivalent to:
PVC DWV ASTM D-2665
CPVC ASTM F-438
ABS ASTM D-2661/3311
UL-1738
If CPVC orABS pipe and fittings are used, the
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, an equivalent fitting of that material may
be substituted if the screen in the PVC terminal is
removed and inserted into the new fitting.
This water heater is supplied with a 45 degree PVC
termination elbow and the applicable vent screens.
A 90 degree termination elbow is optional.
ASTM D-2564 Grade Cement should be used on
PVC Materials and ASTM F-493 Grade Cement on
CPVC Materials.
Polypropylene Vent Systems
Polypropylene vent systems do not use cement
to connect the pipe and elbow sections but use a
push together gasket seal method. Do not attempt
to connect polypropylene with sealant cement.
Polypropylene vent systems are designed to
use specific adaptors to connect into the rubber
coupling on the top of the blower. These are
available through your venting supplier.
The PVC vent termination elbow supplied with
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