Navien NCB700-2S Plus 42K, Installation & Operation Manual

Page: 71 / 100

Operating the Boiler 71
Item Description
10. CH Min Limit
Set the central heating
minimum heat capacity limit.
●
Setting range: Central heating
minimum capacity (%) –
[central heating minimum
capacity limit-20] %
●
Default: Boiler’s minimum
heat capacity
11. CH Max Limit
Set the central heating
maximum heat capacity limit.
●
Setting range: (Central
heating minimum capacity
limit + 20) % – 100%
●
Default: 100%
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 minimum
capacity limit +20] % – 100%
●
Default: 100%
14. DHW Wait Time
Set the DHW wait time.
●
Setting range: 0 – 20 min
●
Default: 5 min
15. CH Min Burning Time
Set the low-load combustion
time at initial operation.
●
Setting range: 0 – 20 min
●
Default: 1 min
16. Burning Acceleration
Time
Set the time to reach the
maximum central heating
capacity after initial operation.
●
Setting range: 0 – 20 min
●
Default: 3 min
17. DHW Priority Time
Set the time duration that
the boiler will remain in DHW
priority.
18. Service Notify 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)
Press the Back button ( ) to return to the previous screen or
menu.
Item Description
1. Supply MIN Set-point
Set the central heating supply
minimum temperature.
●
Setting range: 25°C – [MAX
Set- point – 20°C]
●
Default: 40°C
2. Supply MAX Set-point
Set the central heating supply
maximum temperature.
●
Setting range: [MIN Set-point
+ 20°C] – 90°C
●
Default: 85°C
3. Return MIN Set-point
Set the central heating supply
minimum temperature.
●
Setting range: [MAX Set-
point - 10°C]
●
Default: 30°C
4. Return MAX Set-point
Set the central heating supply
maximum temperature.
●
Setting range: [MIN Set-point
+ 10°C] – 70°C
●
Default: 65°C
5. CH Burning Off Diff
Set the temperature range to
turn off central heating.
●
Setting range: 0°C – 30°C
●
Default: 2°C
6. CH Burning On Diff
Set the temperature range to
turn on central heating.
●
Setting range: 1°C – 30°C
●
Default: 3°C
7. Anti Fast Cycling Time*
Set the anti-fast cycling time.
●
Setting range: 0 – 20 min
●
Default: 3 min
8. Freeze protection
Set the pump freeze protection
temperature.
●
Setting range: 6°C – 10°C
●
Default: 10°C
Note
The system
freeze protection
temperature is set
based on the pump
freeze protection
temperature.
9. Boiler Pump Delay
Set the boiler pump off delay
time.
●
Setting range: 30 – 40 min
●
Default: 40 min