Operating The Boiler; Turning The Boiler On Or Off; Adjusting The Temperature - Navien NFC-175 Installation & Operation Manual

11. Operating the Boiler

11.1 Turning the Boiler On or Off

To turn the boiler on or off, press the Power button for 0.3 seconds.
When the power is on, the boiler automatically enters normal
operation mode, and the boiler's operating conditions are
displayed on the screen.
The boiler status icons remain displayed when the
Note
boiler is turned off.

11.2 Adjusting the Temperature

11.2.1 Adjusting the Space Heating Temperature
To adjust the heating temperature:
1. In normal operation mode, rotate the Command dial
( ) . The space heating temperature(
screen.
86 Operating the Boiler
) is highlighted on the
2. Press the Command dial (
temperature. The highlighted section will flash.
3. Rotate the Command dial (
decrease the temperature.
4. Press the Command dial (
5. Press the Back button (
mode, or rotate the Command dial (
operation conditions.
You can adjust the temperature while the highlighted section is
flashing. Once the flashing stops, the current temperature setting
is stored.
The space heating temperature cannot be adjusted
Note
●
when the Outdoor Reset Control is used.
The space heating temperature cannot be adjusted
●
if the boiler is operating as a sub unit in a cascade
system. The main unit's set temperature will be
displayed on the screen.
In case of outdoor reset sensor malfunction, the
●
boiler will operate at this set temperature.
Take note of the original heating temperature in case
●
you want to restore it to the default.
The default space heating supply water temperature
●
range is 104°F (40°C, Absolute MIN) to 180°F (82°C,
Absolute MAX).
The default space heating return water temperature
●
range is 86°F (30°C, Absolute MIN) to 149°F (65°C,
Absolute MAX).
You can adjust the temperature ranges in the
●
parameter settings menu.
The boiler will retain your settings during a power
●
outage.
) to select the space heating
) to the right or left to increase or
) to confirm the new temperature.
) to return to normal operation
) to adjust other