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Installing a Common Vent System
9.6 Common Vent Termination
Clearances
9.6.1 Direct Vent Application – Vertical
Installation
End
Cap
12"
(30 cm)
min.
36" (91cm) min.
Exhaust
Intake
12"
(30 cm)
min.
9.6.2 Venting Intake and Exhaust to
Different Locations
Intake
End
Cap
Exhaust
9.5 Setting up the Common Vent
System
Refer to the following figures when setting the
common vent type.
To view and configure the cascade settings, press
the Back button (
) and the Menu button (
)
simultaneously for 3 seconds, and then select
“4. Cascade Status and Settings”.
Rotate the Command dial (
) to switch between
the parameters or to increase/decrease setting
values. Press the Command dial (
) to select “8.
Vent Type Setting”.
Note
For more information on the vent type
settings, refer to “11.6.4 Configuring a
9.4 Connecting and Terminating the Vent Pipe
Refer to the following example to install the common vent system. The installation area should be measured
to ensure that sufficient space is available to install the boiler units and the common vent system. Ensure that
the common vent system is installed near the boiler units while satisfying all clearance requirements that are
specified in this manual as well as the Installation Manuals supplied with the boiler units.
9.4.1 Connecting the Main Pipe Runs to Wye Joint or Wye Assembly
After connecting the wye joint or wye assembly, connect the main trunk pipe to each side of the wye joint or wye
assembly. Each trunk pipe is connected to the other wye joint or wye assembly. Refer to “Connecting Pipes with
Cement” on page 80 for more information.
DANGER
If the connections leak, harmful flue gas may cause personal injury or death. After completing the installation
and filling the boiler with water, turn on the water heater and test for leaks using a bubble test kit. After
applying the soap solution, bubbles will form on the connection if any leaks exist.
9.4.2 Installing the System Termination
End caps, pipe elbows or tee joints can be used at the open ends of the intake and exhaust vent pipes. Refer to
the following installation examples that depict how the parts are fitted at the end of the common vent system
piping.
Note
The illustration is intended for reference purposes only.
Summary of Contents for NFB-175H
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