Navien NFC-175 Installation & Operation Manual page 46

3.7.9 Wiring Diagram - Optional Supply/Return Temperature Sensors
Supply Temperature
Sensor (recommended)
To control the boiler supply or return water temperature using the external temperature sensor, configure the system
Note
●
accordingly. On the front panel, press the Menu button (
> 4. SH Control Method to select one of the control modes.
For best performance, wrap the sensor and pipe section with thermal insulation.
●
A single temperature sensor is supplied with the boiler. Additional temperature sensors are available for purchase. Contact
●
Navien for more information.
46 About the Boiler
<NFC>
SUPPLY
Temperature Sensor
TEMPERATURE SENSOR
Return Temperature Sensor (optional)
Thermal insulation
) to enter the setting menu, and then select 3. Space Htg Operation
RETURN OUTDOOR T/S_ZONE3
R C
W
Cable tie