John Wood Power Direct Vent (ENERGY STAR) - Manual (Page 10)

Vent Pipe Runs
WARNING
This unit includes an air intake terminal and
an exhaust vent terminal.
1. The exhaust vent system must not, under any circum-
stances, be run downhill then run uphill thus forming a
valley. It may leave a space to accumulate condensation
and block vent pipe.
2. Horizontal runs require a minimum 3mm (1/8 in.) rise
per 1.5m (5 ft) and a support every 1.2m (4 ft.). Ensure
there is enough height between heater and termination
to raise vent pipe runs the required distance.
3. Vertical runs require a support every 1.5m (5 ft.) that
must provide proper support to prevent stress on the
pipes.
Figure 4. Correct Pipe Fittings
90° SHORT SWEEP ELBOW
(MORE RESTRICTIVE)
90° LONG SWEEP ELBOW
(LESS RESTRICTIVE)
Vent Pipe Termination
This water heater includes one (1) pair of more restrictive
Vent Termination Screens and one (1) pair of less restrictive
Vent Termination Screens. For safety and optimum efficien-
cy performance, ensure the correct Vent Termination Screen
is installed for the vent length in your installation.
Note: Before installing the Power Direct Vent Water Heater,
it is recommended that the location of the pipe terminations
(air intake and exhaust vent) be determined.
Use the more restrictive Vent Termination Screen shown
in Figure 5 when the equivalent vent length (see Table 1)
is between 2.1 and 7.6m (7 and 25 ft.). Install the Vent
Termination Screen in the Termination Elbow as shown, on
both the air intake pipe and the exhaust pipe.
Figure 5. Vent Termination Screen (more restrictive)
for equivalent vent lengths from 2.1 to 7.6m
(7 to 25 ft.).
Use the less restrictive Vent Termination Screen shown
in Figure 6 when the equivalent vent length (see Table 1)
is between 7.6 and 15.2m (25 and 50 ft.). Install the Vent
Termination Screen in the Termination Elbow as shown, on
both the air intake pipe and the exhaust pipe.
Figure 6. Vent Termination Screen (less restrictive)
for equivalent vent lengths from 7.6 to
15.2m (25 to 50 ft.).
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