Navien NFC-175 Installation & Operation Manual page 97

Item
Set the space heating pump over-run
time.
17. Boiler Pump
Delay**
Setting range: 3 – 40 min
●
Default: 40 min
●
Set the DHW wait time.
18. DHW Wait Time
Setting range: 0 – 20 min
●
Default: 3 min
●
Set the recirculation or HotButton
operation time.
19. Recirc. Interval
Time
Setting range: 1 – 120 min
●
Default: 20 min
●
Set the recirculation interval time.
20. Recirc. Sampling
Setting range: 1 – 120 min
●
Time
Default: 30 min
●
Set the temperature range to turn off
recirculation or HotButton operation.
21. Recirc. Off Diff.
Temp
Setting range: 5°F (3°C) – 54°F (30°C)
●
Default: 9°F (5°C)
●
Set On-Demand recirculation to
activate according to pipe length
when HotButton is installed, and
Thermal Bypass and external surface
22. Fixture Dist.
thermometer is disabled.
(HotButton)
Setting range: 15 ft (4.5 m) – 660 ft
●
(198 m) (5 ft (1.5 m)intervals)
Default: 30 ft (9 m)
●
Set the time for service notification.
Setting range: 30 – 3650 days (10
●
years)
23. Service Notif Time
It can be set in 10 day increments.
●
Default: 1820 days (5 years)
●
Set the service notification according to
the operating times.
Setting range: 300 – 36500 cycles
24. Service Notif Cycl
●
It can be set in 100 cycle increments.
●
Default: 18200 cycles
●
25. Service contact # View the service contact information.
Initialize all parameter settings (panel
26. Factory Reset
and main controller) to factory default.
Change the parameter setting
password.
Rotate the Command dial (
27. P/W Change
change numbers and places, and press
the Command dial (
password.
Description
) to
) to save the new
If you enter an incorrect password 10 times or no
Note
●
input from the front panel display for 5 minutes, the
boiler will return to Normal mode.
To return to the previous mode, press the Reset
●
button.
The Factory default password is "1234".
●
If you make no inputs for 10 seconds in the
●
Parameter Edit mode, the current parameter value
will be saved automatically.
Press and hold the Back button (
●
Edit mode for 5 seconds to reset individual
parameters to their default values.
When you reset one of the following parameters, the
●
corresponding parameter will be reset automatically:
- Supply Min or Max capacity limit
- Return Min or Max capacity limit
* The anti-fast cycling time is the duration that the boiler stops its space
heating operation when the space heating supply or return temperatures
reach the set values for boiler operation stop temperatures. The boiler
will not resume space heating until the duration elapses, even when the
space heating supply or return temperatures return to within the set
ranges.
** Boiler Pump Delay is the duration the circulation pump continues to run
between the space heating supply or return temperature reaching the
set point and the burner turning off. If the space heating supply or return
temperature remains outside of the boiler operation temperature range
for a set period, the pump stops for 10 mins, runs again for 5 mins, and
then repeats the cycle.
11.4.4 Configuring a Cascade System
To view and configure the cascade settings, press the Back button
( ) and the Menu button (
and then select "4. Cascade Status and Set".
Rotate the Command dial (
or to increase/decrease setting values. Press the Command dial
( ) to select a parameter or to confirm after making changes.
) in Parameter
) simultaneously for 3 seconds,
) to switch between the parameters
Operating the Boiler 97