Navien NPE-210A User Manual

54 Installing a Common Vent System
Maintenance Port
Navien Backflow Damper has a maintenance port to allow you to
easily inspect the operating condition of the damper plate.
Damper plate
Maintenance port
Maintenance port
Gasket
Maintenance port cover
Fix screw
Refer to “5.9 Maintenance” for detailed inspection procedures.
Navien Backflow Damper (Back-draft Damper)
Note
When using a common vent in a cascade system,
backflow devices are required to prevent exhaust
from entering the building.
5.3 Starting the Common Vent System
5.3.1 Backflow Damper Assembly
Follow the instructions below to assemble the backflow damper
on the NPE water heater units:
1. Remove the screws from the exhaust vent adapter.
2. Detach the exhaust vent adapter.
3. Connect the backflow damper to the exhaust duct of the water
heater unit.

Navien NPE-210A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Venting	PVC, CPVC
Water Connection Size	3/4" NPT
Gas Connection Size	3/4" NPT
Voltage	120V
Temperature Range	98°F - 140°F
Ignition Type	Electronic
Warranty	15 years heat exchanger, 5 years parts
Energy Efficiency	Condensing