Navien NFB-175 Mode D'emploi page 45

3.6.11 Wiring Diagram - Optional Supply/Return Temperature Sensors
To control the boiler supply or return water temperature using the external temperature sensors, configure the system accordingly.
Note
On the front panel, press the Menu button (
Method to select one of the control modes.
<NFB>
SUPPLY
Temperature sensor
Thermal insulation
) to enter the setting menu, and then select 3. Space Htg Operation > 4. SH Control
W
R
C
W
R
C
W
R
RETURN OUTDOOR DHW TANK
Cable tie
Installing the System Piping 45