Navien NFB Series User Manual

96 Operating the Boiler
11.4.8 Operating in Air Purge Mode
To operate the boiler in air purge mode, press the Back button
( ) and the Menu button ( ) simultaneously for 3 seconds, and
then select “8. Air Purge Mode”.
Rotate the Command dial ( ) to switch between the parameters.
Press the Command dial (
) to run an air purge.
The boiler resumes operation in normal operation mode if no input
is detected for 15 minutes.
Press the Back button (
) to return to the previous screen or
menu.
Item Description
1. SH pipe air purge
Run an air purge on the space heating
pipe.
2. DHW pipe air
purge
Run an air purge on the DHW pipe.

Navien NFB Series Specifications

General

Type	Condensing Boiler
Fuel Type	Natural Gas or Propane
Heat Exchanger	Stainless Steel
Vent Type	Direct Vent
Vent Diameter	2" or 3"