Navien NHB Series, Installation & Operation Manual

Page: 102 / 135

102 Operating the Boiler
Item Description
19. Boiler Pump Delay
Set the SH pump over-run time.
Ɣ
Setting range: ON/OFF
Ɣ
Default: OFF
20. DHW Demand On
Differential
Set the DHW On temperature when
using the DHW temperature sensor.
Ɣ
Setting range: 0°F (0°C) – 18°F (10°C)
Ɣ
Default: 5°F (3°C)
21. DHW Demand Off
Differential
Set the DHW Off temperature when
using the DHW temperature sensor.
Ɣ
Setting range: 0°F (0°C) – 9°F (5°C)
Ɣ
Default: 0°F (0°C)
22. Service
Notification Time
Ɣ
Setting range: 30 –
3650 days (10 years)
Ɣ
It can be set in 10 day increments.
Ɣ
Default: 1820 days (5 years)
23. Service
Notification Cycle
Set the service notification according to
the operating times.
Ɣ Setting range: 300 – 36500 cycles
Ɣ It can be set in 100 cycle increments.
Ɣ Default: 18200 cycles
24. Service Contact
Phone Number
View the service contact information.
25. Factory Reset
Initialize all parameter settings (panel
and main controller) to factory default.
26. P/W Change
Change the parameter setting
password.
Note
Ɣ
If you enter an incorrect password 10 times or do not
press any buttons for 5 minutes, the boiler will return
to Normal mode.
Ɣ
The Factory default password is “1234”.
Ɣ
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
- Lowest Outdoor Temperature or Highest Outdoor
Temperature
* 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.
Item Description
10. Burning
Acceleration Time
Set the time to reach the maximum
space heating capacity after initial
operation.
Ɣ
Setting range: 0 – 20 min
Ɣ
Default: 3 min
11. Anti Fast Cycling
Time*
Set the anti-fast cycling time.
Ɣ
Setting range: 0 – 20 min
Ɣ
Default: 3 min
12. DHW Min Limit
Set the DHW supply minimum
temperature.
Ɣ Setting range: DHW minimum
capacity (%) – [DHW MAX capacity
limit - 20] %
Ɣ
Default: Boiler’s minimum heat
capacity
13. DHW Max Limit
Set the DHW supply maximum
temperature.
Ɣ
Setting range: [DHW Min capacity
limit + 20] % – 100%
Ɣ
Default: 100%
14. Freeze Protection
Set the pump freeze protection
temperature.
Ɣ
Setting range: 43°F (6°C) – 50°F (10°C)
Ɣ
Default: 50°F (10°C)
Note
The system freeze protection
temperature is set based on
the pump freeze protection
temperature.
15. Low System
Pressure
Set the low water system pressure.
Ɣ Setting range: 4 – 17 psi
Ɣ Default: 6 psi
16. High System
Pressure
Set the low water system pressure.
Ɣ
Setting range: 40 – 141 psi
Ɣ
Default: 70 psi
17. Boiler pump
operation(DHW)
Turn on or turn off the boiler pump in
DHW mode.
Ɣ
Setting range: ON/OFF
Ɣ
Default: OFF
18. DHW Pump
Operation
Turn on or turn off the DHW pump
when space heating and DHW modes
are required at the same time while
using space heating mode.
Ɣ
Default: ON