Maintenance port
Refer to "5.8 Maintenance" for detailed inspection
procedures of the Navien Common Vent Collar Kit
(Back-draft Damper).
When using a common vent in a
Note
cascade system, backflow devices
are required to prevent exhaust from
entering the building.
Gasket
Maintenance port cover
Fix screw
5.3 Starting the Common Vent
System
5.3.1 Common Vent Collar Kit Assembly
Follow the instructions below to assemble the
Common Vent Collar Kit on the NPE water heater
units:
1. Remove the screws from the exhaust vent
adapter.
2. Open the front cover.
Detach the exhaust vent adapter from the top
of the unit. Disconnect the Vent Installation
Detector (VID) wiring from the harness.
3. Connect the Common Vent Collar Kit to the
exhaust duct of the water heater unit.
Installing a Common Vent System
71
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