Loading ...
Loading ...
Loading ...
This water heater may also be installed with 3 in. (7.6 cm)
diameter pipe and fittings for the vent and combustion air-
inlet systems.
To connect the vent system piping:
• Install a straight length of 2 in. (5.1 cm) diameter pipe
to the rubber coupling on the blower assembly,
• Followed by a 2 in. (5.1 cm) to 3 in. (7.6 cm) diameter
pipe increaser fitting (See Figure 2).
To connect the combustion air-inlet system piping:
• Install a straight length of 2 in. (5.1 cm) diameter pipe
to the combustion air-inlet piping tee coupling,
• Followed by a 2 in. (5.1 cm) to 3 in. (7.6 cm) diameter
pipe increaser fitting (See Figure 2).
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
tightened 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 1.
• 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.
13
Figure 1
Vent
Combustion air-inlet
2 in.
(5.1cm)
pipe
diameter
2 in.
(5.1cm)
pipe
diameter
Figure 2
3 in.
(7.6 cm) pipe
diameter
Vent
Combustion air-inlet
# Min. 2 1/2 in.
(6.4 cm) to
6 in. (15.2 cm)
Max.Spacing
# Min. 2 1/2 in.
(6.4 cm) to
6 in. (15.2 cm)
Max. Spacing
Long Bend 90° Elbow
Standard Bend 90° Elbow
Short Bend 90° Elbow
Do Not Use
Elbow Examples
OK to Use OK to Use
#
#
Loading ...
Loading ...
Loading ...