43
Installing a Vent (For common vent installation only)
Maintenance
Periodically check the damper condition inside the backflow
damper through the maintenance port to ensure optimal
performance of the system. Follow the instructions to check the
damper condition and replace the backflow damper if necessary.
1
Remove the screw that fixes the maintenance port cover to
the backflow damper, and then remove the gasket and the
maintenance port cover.
Gasket
Maintenance
port cover
Fix screw
Maintenance port
2
Through the maintenance port, check the operating condition
of the damper plate inside the backflow damper.
Damper pad is CLOSED.
Damper pad is OPEN.
3
Reinstall the gasket and maintenance port cover, and then fix
them with a set screw.
4
Visually inspect the maintenance port to ensure that the
gasket is properly installed between the maintenance port
and the maintenance port cover.
Example of a Typical Installation
The following illustration depicts an example of a common vent
system installed for a cascade system of 8 VR Water heater units.
Notice
The illustration is intended for reference purpose only.
Drain hose installation is not required if there is slope in the
horizontal exhaust.
Slope
Exhaust Termination Tee
Intake 90° Elbow
Termination
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