Navien NFB-175H, Installation Manual, Page: 112 / 135

112 Operating the Boiler
Press the Back button ( ) to return to the previous
screen or menu.
Item Description
1. NaviLink Connect
Turn on or turn off
the remote control
capabilities via the
NaviLink connection.
●
Setting range: On/Off
●
Default: Off
2. AHU
Communication
AHU connect is
communication feature
can be used when NFB-H.
AHU has an RS-485
communication function.
●
Setting range: Enable
or Disable
●
Default: Disable
Note
The AHU connection is compatible with
iFlow Air Handlers only. Contact iFlow
directly for more information.
11.6.6 Diagnosing the Boiler System
To run a series of test procedures for a system
diagnosis, press the Back button ( ) and the Menu
button ( ) simultaneously for 3 seconds, and then
select “6. Test Mode”.
Rotate the Command dial ( ) to switch between
the test procedures. Press the Command dial ( ) to
run a test procedure.
Item Description
6. Number of Oper-
Unit
The number of units
currently operating in the
cascade system.
7. Cascade Info.
View the operating status
of individual units in the
cascade system.
8. Vent Type Setting
If not in the cascade
system, the default
setting is Individual Vent.
Note
In the cascade
system, the
default setting is
Common Vent.
9. Cascade Min-
Operation Unit
Set the minimum number
of the operation units for
the cascade system.
●
Setting range: 1 – 32
●
Default: 1
Note
Sub units of a
cascade system
cannot use this
item.
11.6.5 Setting the External Connection
To view and configure the external network
connection, press the Back button ( ) and the
Menu button ( ) simultaneously for 3 seconds,
and then select “5. External Connection”.
Rotate the Command dial ( ) to switch between
the parameters or to increase/decrease setting
values. Press the Command dial ( ) to select a
parameter or to confirm after making changes.