Navien NHB Series, Installation & Operation Manual

Page: 101 / 135

101 Operating the Boiler
Item Description
1. Supply Absolute
MIN Set-point
Set the space heating supply minimum
temperature.
Ɣ
Setting range: 77°F (25°C) – [MAX
Set-point – 36°F (20°C)]
Ɣ
Default: 104°F (40°C)
2. Supply Absolute
MAX Set-point
Set the space heating supply maximum
temperature.
Ɣ
Setting range: [MIN Set-point + 36°F
(20°C)] – 194°F (90°C)
Ɣ
Default: 180°F (82°C)
3. Return Absolute
MIN Set-point
Set the space heating return minimum
temperature.
Ɣ
Setting range: 68°F (20°C) – [MAX
Set-point – 18°F (10°C)]
Ɣ
Default: 86°F (30°C)
4. Return Absolute
MAX Set-point
Set the space heating return maximum
temperature.
Ɣ
Setting range: [MIN Set-point + 18°F
(10°C)] – 158°F (70°C)
Ɣ
Default: 149°F (65°C)
5. SH Burner Off
Differential
Set the temperature range to turn off
space heating.
Ɣ
Setting range: 2°F (1°C) – 54°F (30°C)
Ɣ
Default: 4°F (2°C)
6. SH Burner On
Differential
Set the temperature range to turn on
space heating.
Ɣ
Setting range: 2°F (1°C) – 54°F (30°C)
Ɣ
Default: 5°F (3°C)
7. SH Min Limit
Set space heating minimum heat
capacity limit.
Ɣ
Setting range: Space heating Min
capacity (%) – [space heating min
capacity limit -20]) %
Ɣ Default: Boiler’s minimum heat
capacity
8. SH Max Limit
Set space heating maximum heat
capacity limit.
Ɣ
Setting range: (Space heating Min
capacity limit +20) % – 100%
Ɣ
Default: 100%
9. SH Min Burning
Time
Set the low-load combustion time at
initial operation.
Ɣ
Setting range: 1 – 20 min
Ɣ
Default: 1 min
11.6.3 Setting the Operation Parameters
To set the boiler’s operation parameters, tap the Set button ( ) >
Parameter on the screen.
On the password screen, enter the password.
The default factory password is “1234”.
CAUTION
Parameters must be set by a qualified professional with
an extensive understanding of the boiler system. Setting
parameters improperly may lead to property damage or injury.
Note
To save the parameter settings, tap the Save ( )
button on the top right of the screen. If the parameter
settings are saved successfully, the Saved (
)
button will be displayed.