10
INSTALLATION OF VENT SYSTEM
WARNING
THE OPTIONAL INTAKE VENTING ARRANGEMENT AND THE
EXHAUST VENTING ARRANGEMENT MUST BE INSTALLED TO
RUN DIRECTLY TO THE OUTDOORS AND NOT IN ANY WAY
BE CONNECTED TO ANOTHER VENTING SYSTEM (I.E.
FURNACE, DRYERS OR SPACE HEATERS). IT IS CRUCIAL THAT
THE VENTING ARRANGEMENT BE KEPT SEPARATE FROM
OTHER VENTING SYSTEMS. IF THIS WARNING IS IGNORED,
AND THE SYSTEM IS VENTED INCORRECTLY, IT MAY CAUSE
IMPROPER OPERATION, FIRE, EXPLOSION, OR ASPHYXIATION.
1. Plan the route of the vent system from the vent termination to
the planned location of the appliance. Layout the total vent
system to use the minimum of vent pipe and elbows possible.
2. This unit is certified for the use of 4-inch PVC pipe for venting.
The maximum length of 80-equivalent feet of 4-inch PVC pipe
may be used for the intake venting arrangement and a maximum
length of 80-equivalent feet of 4-inch PVC pipe may be used on
the exhaust venting arrangement. The maximum number of
90 degree elbows for the 4-inch venting is six (6) in the intake
and six (6) on the exhaust. A 90 degree elbow is equal to five (5)
equivalent feet of 4-inch pipe. One 90 degree elbow is equaled
to two 45 degree elbows.
Table 2. VENT LENGTH TABLE
3. The unit is certified to a minimum amount of 4-inch pipe for the
exhaust venting arrangement of 15-equivalent feet. This is the
minimum amount of pipe required for the exhaust venting
arrangement. The intake venting arrangement is certified to use
a minimum of 0-equivalent feet of 4-inch PVC pipe.
4. The 3-inch PVC terminals supplied with the unit must be used
with the 4-inch venting by adding a 4" x 3" reducer coupling at
the venting terminals. A reducing coupling is also required
immediately before the 3-inch blower adapter (intake) if direct
venting is installed.
IMPORTANT
When multiple units are direct vented through a wall (4-inch venting),
all intake vent terminals should be no lower than the highest exhaust
vent terminal.
NOTE: This unit can be vented using only PVC (Class 160, ASTM
D-2241 Schedule 40, ASTM D-1785 ; or Cellular Core Schedule
40 DWV, ASTM F-891) , Schedule 40 CPVC (ASTM F-411), or
ABS (ASTM D-2661) pipe. The fittings, other than the
TERMINATIONS should be equivalent to PVC-DWV fittings meeting
ASTM D-2665 (Use CPVC fittings, ASTM F-438 for CPVC pipe
and ABS fittings, ASTM D-2661/3311 for ABS pipe. If CPVC or
ABS pipe and fittings are used, then the proper cement must be
used for all joints, including joining the pipe to the Termination
(PVC Material). PVC Materials should use ASTM D-2564 Grade
Cement; CPVC Materials should use ASTM F-493 Grade Cement
and ; ABS Materials should use ASTM D-2235 Grade Cement.
NOTE: for Water Heaters in locations with high ambient
temperatures (above 100°F or 38°C) and/or insufficient dilution air,
it is recommended that CPVC or ABS pipe and fittings (MUST USE
SUPPLIED VENT TERMINAL) be used.
5. It is important that condensate not be allowed to buildup in the
exhaust vent pipe. To prevent this from happening the pipe should
be installed with a slight, 1/8 inch (3mm) per 5 feet (152 cm) of
pipe maximum downward slope.
6. The vent system should be supported every 5 feet (152 cm) of
vertical run and every 3 feet (91cm) of horizontal run of vent
pipe length.
NOTE: Stress levels in the pipe and fittings can be significantly
increased by improper installation. If rigid pipe clamps are used to
hold the pipe in place, or if the pipe cannot move freely through a
wall penetration, the pipe may be directly stressed, or high thermal
stresses may be formed when the pipe heats up and expands.
Install accordingly to minimize such stresses.
FIGURE 12
VENT PIPE PREPARATION
1. INITIAL PREPARATION
A. Make sure the solvent cement you are planning to use is
designed for the specific application you are attempting.
B. Know the physical and chemical characteristics and
limitations of the PVC, PVC cellular core, ABS or CPVC
piping materials that you are about to use.
C. Know the reputation of your pipe and cement manufacturer
and their products.
D. Know your own qualifications or those of your contractor.
The solvent welding technique of joining PVC, PVC cellular
core, ABS or CPVC pipe is a specialized skill just as any
other pipe fitting technique.
E. Closely supervise the installation and inspect the finished
job before start-up.
Number 4" PVC
of 90°
Maximum
Maximum
Elbows
Feet. of Pipe
Meters of Pipe
ONE (1)
75'
22.9 m
TWO (2)
70'
21.3 m
THREE (3)
65'
19.8 m
FOUR (4)
60'
18.3 m
FIVE (5)
55'
16.8 m
SIX (6)
50'
15.2 m
OUTLET VIEW
INLET VIEW
