Navien NFC-175, Service Manual

Page: 45 / 138

NFC Service Manual 45 Version 1.0
Note
●
If you enter an incorrect password 10 times or no
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 ( ) in Parameter
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.
Item Description
18. DHW Wait Time
Set the DHW wait time.
●
Setting range: 0 – 20 min
●
Default: 3 min
19. Recirc. Interval
Time
Set the recirculation or HotButton
operation time.
●
Setting range: 1 – 120 min
●
Default: 20 min
20. Recirc. Sampling
Time
Set the recirculation interval time.
●
Setting range: 1 – 120 min
●
Default: 30 min
21. Recirc. Off Diff.
Temp
Set the temperature range to turn off
recirculation or HotButton operation.
●
Setting range: 5°F (3°C) – 54°F (30°C)
●
Default: 9°F (5°C)
22. Fixture Dist.
(HotButton)
Set On-Demand recirculation to
activate according to pipe length
when HotButton is installed, and
Thermal Bypass and external surface
thermometer is disabled.
●
Setting range: 15 ft (4.5 m) – 660 ft
(198 m) (5 ft (1.5 m)intervals)
●
Default: 30 ft (9 m)
23. Service Notif Time
Set the time for service notification.
●
Setting range: 30 – 3650 days (10
years)
●
It can be set in 10 day increments.
●
Default: 1820 days (5 years)
24. Service Notif Cycl
Set the service notification according to
the operating times.
●
Setting range: 300 – 36500 cycles
●
It can be set in 100 cycle increments.
●
Default: 18200 cycles
25. Service contact # View the service contact information.
26. Factory Reset
Initialize all parameter settings (panel
and main controller) to factory default.
27. P/W Change
Change the parameter setting
password.
Rotate the Command dial ( ) to
change numbers and places, and press
the Command dial ( ) to save the new
password.