Navien NFB Series User Manual

92 Operating the Boiler
Item Description
21. Boiler Pump
Delay**
Set the space heating pump over-run
time.
●
Setting range: 3 – 40 min
●
Default: 40 min
22. DHW Demand
On Diff
When the DHW temperature sensor is
used:
●
Setting range: 0–10°C (0–18°F)
●
Default: 3°C (5°F)
23. DHW Demand
Off Diff
When the DHW temperature sensor is
used:
●
Setting range: 0–5°C (0–9°F)
●
Default: 0°C (0°F)
24. 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)
25. 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
26. Service contact # View the service contact information.
27. Factory Reset
Initialize all parameter settings (panel
and main controller) to factory default.
28. 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.
Item Description
12. DHW Min Limit
Set the DHW supply minimum
temperature.
●
Setting range: DHW minimum
capacity (%) – [DHW MAX capacity
limit - 20] %
●
Default: Boiler’s minimum heat
capacity
13. DHW Max Limit
Set the DHW supply maximum
temperature.
●
Setting range: [DHW Min capacity
limit + 20] % – 100%
●
Default: 100%
14. Freeze protection
Set the pump freeze protection
temperature.
●
Setting range: 43°F (6°C) – 50°F (10°C)
●
Default: 50°F (10°C)
Note
The system freeze protection
temperature is set based on
the pump freeze protection
temperature.
15. Low Sys Pressure
Set the low water system pressure.
●
Setting range: 4 – 17 psi
●
Default: 6 psi
16. High Sys Pressure
Set the high water system pressure.
●
Setting range: 40 – 80 psi
●
Default: 50 psi
17. Boiler pump
Oper(DHW)
Turn on or turn off the boiler pump in
DHW mode.
●
Setting range: On/Off
●
Default: Off
18. Sys pump
Oper(DHW)
Turn on or turn off the system pump in
DHW mode.
●
Setting range: On/Off
●
Default: Off
19. Zone2 pump
Oper(DHW)
Turn on or turn off Zone 2 pump in
DHW mode.
●
Setting range: On/Off
●
Default: Off
20. DHW pump
Oper(DHW pri)
Turn on or turn off the DHW pump
in DHW mode when both the space
heating and DHW demands are
present.
●
Setting range: On/Off
●
Default: On

Navien NFB Series Specifications

General

Type	Condensing Boiler
Fuel Type	Natural Gas or Propane
Heat Exchanger	Stainless Steel
Vent Type	Direct Vent
Vent Diameter	2" or 3"