Connecting And Terminating The Vent Pipe - Navien NHB H Series Installation And Operation Manual

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.
WARNING
Carbon Monoxide Hazard
To prevent serious injury or death:
ALWAYS use a bubble test kit to check for leaks.
●
After the boiler is installed, fill with water, turn on the boiler and test for leaks using a bubble test kit.
●
If you see bubbles form, you will need to repair that section of pipe and bubble test again.
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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.
The illustration is intended for reference purposes only.
Note
Installing a Common Vent System 87