Navien NFC-250/175H Installation Manual page 55

3.7.10 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,
Note
●
configure the system accordingly. On the front panel, press the Menu button (
setting menu, and then select 2. Space Htg Operation > 5. 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.
<NFC-H>
Temperature
SUPPLY
TEMPERATURE SENSOR
Sensor
Return Temperature Sensor (optional)
Thermal insulation
RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2
R C R C
W W
Cable tie
Installing the System Piping
lLWCO
AC24VL
AC24VN
T/S_ZONE1
R C
W
) to enter the
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