9
7.
Vent Pipe Installation
Vent Terminal Installation
•
Follow the installation instructions included with the vent terminal. It is suggested that the appliance be vented horizontally
through a sidewall. If a vertical vent termination is required, it must follow the requirements of this section (p.9-12).
Vent Terminal Installation Precautions
Note the following vent terminal installation requirements
• Do not install the vent terminal indoors • Install the vent terminal with a downward slope
upward
slope
downward
slope
• Install with the proper length protruding through the wall
•
Avoid storing hazardous
objects near the terminal
Gasoline
Gas
Proper installation. The
red line can be seen,but
the red rectangle cannot
be seen from the outside.
Vent terminal
Vent terminal
not far
enough
too far
Snow
drift
Tree
•
Avoid installing the terminal where obstacles will block it
•
Clearance from vent terminal.
If multiple boilers are installed, terminals
must be separated by a minimum of
either 12" horizontally or 60" vertically.
Vent terminal
Vent terminal
60" or more
• Do not cover the vent terminal with any type of
protective screen or enclosure. Blocked terminals
can cause abnormal combustion resulting in undes-
ired performance from the boiler.
12" or more
Model
Wall thickness (in.)
VT4-TL-5 3.5" to 5.1"
VT4-TL-8 5.1" to 8.3"
VT4-TL-14 8.3" to 14.6"
VT4-TL-27 14.6" to 27.2"
Vent terminal models
• Use only the following models of Noritz
vent terminals with this boiler.
•
VT4-TL
•
VT4-TS
(for long vent runs)
(to be installed directly
on top of the appliance)
Vent
terminal
•
Vent terminal size variations are listed in the table below.
Choose the model according to the wall thickness required.
Boiler
Straight pipe
Use a listed Category III vent adapter
to connect the flue collar to the vent
system. Use Category III vent pipe
for the entire length of the exhaust pipe.
Elbows
Elbow
Vent terminal
sloping down
Intake pipe
Exhaust
pipe
Vent system installation example
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