Use & Care Manual

Read these instructions thoroughly and make sure
you understand all steps and procedures before pro-
ceeding with the installation.
Determine the location for the concentric terminal
then make a 5 in. (12.7 cm) a hole through the roof
and interior ceiling(s) to accommodate the terminal,
vent and combustion air-inlet system pipes and
install a weather-seal boot/flashing (not supplied)
for 4 -1/2 in. (12.4 cm) PVC pipe.
The concentric terminal assembly is designed to
accept 3 in. (7.6 cm) diameter pipe.
If 2 in. (5.1 cm) diameter pipe is used.
● Then either 2 in. x 3 in. (5.1 cm x 7.6 cm) pipe
increasers.
● Or flush bushings must be installed to the vent
and combustion air-inlet connections of the ter-
minal assembly.
● DO NOT use the concentric terminal assembly
with 4 in. (10.2 cm) vent and combustion air-
inlet systems.
Disassemble the concentric terminal assembly.
● Note: The concentric terminal assembly con-
sists of an inner, straight vent pipe, an outer,
straight combustion air-inlet pipe, a Wye fitting
and rain cap.
From inside the building, insert the outer, straight
combustion air-inlet pipe through the weather-seal
boot flashing so that the height from the roof to the
rear of the rain cap when installed is as specified in
the diagram.
NOTICE: The concentric terminal assembly
may be reduced in length as follows:
●
Measure for desired installation length then
cut the outer, straight combustion air-inlet
pipe accordingly but not less than 12 in.
(30 cm).
●
Measure and cut the straight inner vent pipe
of the concentric terminal assembly so it is 13
in. (5.1 cm) longer in length than the outer,
straight combustion air-inlet pipe
● Ensure that there is no insulation or debris in
the pipe.
Assemble the vent pipe assembly.
● Clean and cement the rain cap to the inner,
straight vent pipe.
From the outside, slide the vent pipe with rain cap
assembly through the combustion air-inlet pipe
until the rain cap if fully seated on the pipe.
● Clean and cement the rain cap to the combustion
air-inlet pipe.
● Clean and cement a 3 in. (7.6 cm) diameter,
ULC-S636 approved, Schedule 40, PVC, 90°
street elbow to the rain cap.
● Clean and cement a short, straight section of
3 in. (7.6 cm) diameter, ULC-636 approved
straight pipe to the 90° street elbow.
● Clean and cement a 3 in. (7.6 cm) diameter,
Schedule 40, PVC, 90°, ¼ standard bend, ULC-
S636 approved elbow to the short, straight sec-
tion of pipe.
From the inside, clean and cement the wye fitting
to the vent and combustion air-inlet pipes of the
termination assembly.
Complete the installation of the remainder of the
vent system and attach it to the vent connector fit-
ting on the water heater’s blower assembly.
● Horizontal lengths of the vent system must
slope downward toward the water heater a
minimum of 1/8 in. per foot (10 mm per m).
27
The location of the vent and combustion air-inlet terminal depends on the following minimum
clearances and considerations:
Minimum 18 in. (46 cm) exposed pipe above roof.
Maximum 2 ft. (61 cm) above roof level without additional support for vent.
Four (4) ft. (1.22 m) from any gable, dormer or other roof structure with building interior
access (i.e., vent, window, etc.).
Six (6) ft. (1.8 m) of a mechanical air supply inlet.
Vertical Vent - Alternate Concentric Terminal Installation:
Contact Manufacturer's National Service Department for Kit information, see "If
You Need Service" section.