Navien NFC-175 Installation & Operation Manual page 96

After entering the parameter setting screen, rotate the Command
dial ( ) to switch between the parameters or to increase/
decrease setting values. Press the Command dial (
parameter or to confirm after making changes.
Press the Back button (
menu.
Item
1. Supply MIN Set-
point
2. Supply MAX Set-
point
3. Return MIN Set-
point
4. Return MAX Set-
point
5. SH Burner Off Diff
6. SH Burner On Diff
7. SH Min Limit
96 Operating the Boiler
) to select a
) to return to the previous screen or
Description
Set the space heating supply minimum
temperature.
Setting range: 77°F (25°C) – [MAX
●
Set-point – 36°F (20°C)]
Default: 104°F (40°C)
●
Set the space heating supply maximum
temperature.
Setting range: [MIN Set-point + 36°F
●
(20°C)] – 194°F (90°C)
Default: 180°F (82°C)
●
Set the space heating return minimum
temperature.
Setting range: 68°F (20°C) – [MAX
●
Set-point – 18°F (10°C)]
Default: 86°F (30°C)
●
Set the space heating return maximum
temperature.
Setting range: [MIN Set-point + 18°F
●
(10°C)] – 158°F (70°C)
Default: 149°F (65°C)
●
Set the temperature range to turn off
space heating.
Setting range: 2°F (1°C) – 54°F (30°C)
●
Default: 4°F (2°C)
●
Set the temperature range to turn on
space heating.
Setting range: - 2°F (1°C) – 54°F (30°C)
●
Default: 5°F (3°C)
●
Set space heating minimum heat
capacity limit.
Setting range: Space heating Min
●
capacity (%) – [space heating min
capacity limit -20]) %
Default: Boiler's minimum heat
●
capacity
Item
Set space heating maximum heat
capacity limit.
8. SH Max Limit Setting range: (Space heating Min
●
capacity limit +20) % – 100%
Default: 100%
●
Set the low-load combustion time at
initial operation.
9. SH Min Burning
Time Setting range: 1 – 20 min
●
Default: 1 min
●
Set the time to reach the maximum
space heating capacity after initial
10. Burning
operation.
Acceleration Time
Setting range: 0 – 20 min
●
Default: 1 min
●
Set the anti-fast cycling time.
11. Anti Fast Cycling
Setting range: 0 – 20 min
●
Time*
Default: 3 min
●
Set the DHW supply minimum
temperature.
Setting range: DHW minimum
●
12. DHW Min Limit capacity (%) – [DHW MAX capacity
limit - 20] %
Default: Boiler's minimum heat
●
capacity
Set the DHW supply maximum
temperature.
13. DHW Max Limit Setting range: [DHW Min capacity
●
limit + 20] % – 100%
Default: 100%
●
Set the pump freeze protection
temperature.
Setting range: 43°F (6°C) – 50°F (10°C)
●
Default: 50°F (10°C)
14. Freeze protection ●
Note
Set the Auto-Fill Pressure.
15. Auto-Fill Pressure
Setting range: 12 - 50 psi
●
Default: 12 psi
●
Set the high system water pressure.
16. High Sys Pressure
Setting range: 40 – 80 psi
●
Default: 50 psi
●
Description
The system freeze protection
temperature is set based on
the pump freeze protection
temperature.