Connect the vent system piping to the blower
assembly using the already installed 3 in. (7.6 cm)
diameter rubber coupling and clamps. Connect
the combustion air-inlet system piping to the
combustion air-inlet piping tee using the 3 in. (7.6
cm) already installed rubber coupling and clamps
(See Figure 3). For vent and combustion air-inlet
terminals, use the two (2), 3 in. (7.6 cm) diameter,
Schedule 40, PVC, 90°, 1/4 standard bend elbows
and wire mesh screen assemblies supplied with
the water heater.
This water heater may also be installed with 4 in.
(10.2 cm) diameter pipe and fittings for the vent
and combustion air-inlet systems. When using 4
in. (10.2 cm) diameter pipe, two (2), 3 in. (7.6 cm)
to 4 in. (10.1 cm) diameter pipe increaser fittings
are required for connection of the vent system
piping to the blower assembly and combustion
air-inlet system piping to the combustion air-inlet
piping tee couplings (See Figure 4). For vent and
combustion air-inlet terminals, 4 in. (10.1 cm)
diameter, Schedule 40, PVC, 90°, 1/4 standard
bend elbows (not supplied) along with the two (2)
wire mesh screens (supplied) must be installed.
DO NOT use unequal sizes except as defined
previously for the vent and combustion air-inlet
systems.
IMPORTANT: Ensure that all the coupling
clamps are firmly tight, then leak test the vent sys-
tem joints using a soap and water solution. Repair
any leak before allowing the water heater to oper-
ate.
When using CPVC or ABS pipe and fittings, use
90° elbows of the corresponding size and material
for the vent and combustion air-inlet terminals.
Install supplied wire mesh screens into the CPVC
or ABS vent and combustion air-inlet terminal
elbows.
The vent and combustion air-inlet terminals of the
water heater must be installed in the same atmo-
spheric pressure zone.
The minimum and maximum equivalent lengths
for the vent and combustion air-inlet systems are
shown in Table 2. Maintain a minimum vertical
height of 1 foot (3.5 cm) of pipe from the blower
exhaust before transitioning in any elbow. The
vent and combustion air-inlet terminations are not
included in the equivalency calculations.
Notice: One (1), 90°, 1/4 standard bend elbow is
equivalent to 5 feet (1.52 meters) of straight pipe
and quantity one (1), 45°, 1/8 standard bend elbow
is equivalent to 2.5 feet (0.76 meters) of straight
pipe.
DO NOT use short bend elbows.
15
Maximum and Minimum Vent and Combustion Air-Inlet Lengths For
Power Direct Vent Models:
50 Gallon With Inputs of 65,000 & 47,000 BTU/Hr.
65 Gallon With Inputs of 65,000 & 56,000 BTU/Hr.
75 Gallon With Inputs of 75,100 & 70,000 BTU/Hr.
4 in. (10.2 cm)
3 in. (7.6
cm)
3 in. (7.6 cm)
Figure 4
4 in. (10.2 cm)
Figure 3
3 in.
(7.6 cm)
3 in.
(7.6 cm)
Vent
Combustion
Air-Inlet
Vent
Combustion
Air-Inlet
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