Navien NFB-175 Mode D'emploi page 91

In the password screen, Rotate the Command dial (
numbers and places, and press the Command dial (
the password.
The factory default password is "1234".
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 ( ) to return to the previous screen or
menu.
Item
Set the space heating supply minimum
temperature.
1. Supply MIN Set-
Setting range: 77°F (25°C) – [MAX
●
point
Set-point – 36°F (20°C)]
Default: 104°F (40°C)
●
Set the space heating supply maximum
temperature.
2. Supply MAX Set-
Setting range: [MIN Set-point + 36°F
●
point
(20°C)] – 194°F (90°C)
Default: 180°F (82°C)
●
) to change
) to enter
) to select a
Description
Item
Set the space heating return minimum
temperature.
3. Return MIN Set-
Setting range: 68°F (20°C) – [MAX
●
point
Set-point – 18°F (10°C)]
Default: 86°F (30°C)
●
Set the space heating return maximum
temperature.
4. Return MAX Set-
Setting range: [MIN Set-point + 18°F
●
point
(10°C)] – 158°F (70°C)
Default: 149°F (65°C)
●
Set the temperature range to turn off
space heating.
5. SH Burner Off Diff
Setting range: 2°F (1°C) – 54°F (30°C)
●
Default: 4°F (2°C)
●
Set the temperature range to turn on
space heating.
6. SH Burner On Diff
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
●
7. SH Min Limit capacity (%) – [space heating min
capacity limit -20]) %
Default: Boiler's minimum heat
●
capacity
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
●
Description
Operating the Boiler 91