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Read these instructions thoroughly and make sure
you understand all steps and procedures before
proceeding with the installation.
1. Connect the vent system piping to the blower
assembly using the already installed 3 in.
(7.6 cm) diameter rubber coupling and
clamps.
2. 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).
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 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
To connect the vent system piping,
• Install a straight length of 3 in. (7.6 cm)
diameter pipe to the rubber coupling on the
blower assembly,
• Followed by a 3 in. (7.6 cm) to 4 in.
(10.2 cm) diameter pipe increaser fitting
(See Figure 4).
To connect the combustion air-inlet system piping,
• Install a straight length of 3 in. (7.6 cm)
diameter pipe to the combustion air-inlet
piping tee coupling,
• Followed by a 3 in. (7.6 cm) to 4 in.
(10.2 cm) diameter pipe increaser fitting
(See Figure 4).
For vent and combustion air-inlet terminals,
• Use 3 in. (7.6 cm) diameter, Schedule 40,
PVC, 90°, 1/4 standard bend elbows (not
supplied).
DO NOT use unequal diameters of pipe and
fittings for the vent and combustion air-inlet
systems except as defined previously.
NOTICE: The difference between the vent and
combustion air-inlet system equivalent lengths
must be no greater than 5 ft. (1.5 m).
IMPORTANT: Ensure that all the coupling
clamps are tight before allowing the water heater
to operate.
When using CPVC or ABS pipe and fittings, use
90° elbows of the corresponding size and material
for the vent terminal and combustion air-inlet
terminals.
The vent and combustion air-inlet terminals of
the water heater must be installed in the same
atmospheric 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 ft.
(30.5 cm) of pipe, including pipe increasers
(if used), from the blower exhaust coupling
before transitioning into any elbow.
• The vent and combustion air-inlet
terminations are not included in the
equivalency calculations.
NOTICE: A 90°, 1/4 standard bend or long
bend elbow is equivalent to 5 ft. (1.52 m) of
straight pipe. A 45°, 1/8 standard bend or long
bend elbow is equivalent to 2.5 ft. (0.76 m) of
straight pipe.
DO NOT use short bend elbows. Use only
standard and/or long bend elbows. See examples
below.
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/h
65 Gallon With Inputs of 65,000 & 56,000 Btu/h
75 Gallon With Inputs of 75,100 & 70,000 Btu/h
Elbow Examples
Long Bend 90° Elbow
Standard Bend 90° Elbow
Short Bend 90° Elbow
Do Not Use OK to Use OK to Use
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