Navien NCB-24LSWE, Service Manual

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48 NCB Service Manual Version 1.0
Item Description Display
(D) Highest
outdoor
temperature
This mode is used to configure the highest outdoor temperature setting.
The boiler will operate at the highest setting in the supply or return
temperature setting range for that temperature.
Outdoor High Temperature Setting Range
Range Default
(Outdoor low temperature set point + 5
℃
) to 40
℃
21
℃
Highest outdoor
temperature (°C)
Highest outdoor
temperature not used
(E) Boost
Interval
time
The boost interval time is used to prevent interruptions to space heating
when there are changes in heating system conditions in Outdoor Reset
Control mode. When boost interval time is enabled and a set time
elapses, the boiler increases the space heating supply temperature by
5
℃
(41
℉
) and the return temperature by 3
℃
(37
℉
).
Setting Range Default
Boost Interval
Time
0 to120 min (0: OFF) OFF (0)
Boost
Temperature
Supply fixed value: 5
℃
None
Return fixed value: 3
℃
None
Boost interval time set at
30 minutes
(F) Maximum
heating
capacity
This menu configures the desired space heating capacity. When the
boiler operates in <Normal operation mode>, the space heating capacity
is limited to the set value (%)
Range Default
(Space heating capacity
minimum set point + 20%) to
100%
100%
Maximum heating
capacity (%)
Eg.) 95%
(G) Minimum
heating
capacity
This menu configures the desired space heating capacity. When the
boiler operates in <Normal operation mode>, the minimum space
heating capacity is limited to the set value (%).
Range Default
Space heating capacity to
(space heating capacity
maximum set point - 20%)
Space heating minimum
capacity (%)
Minimum heating
capacity (%)
Eg.) 30%
(H) Pump
freezing
temperature
This menu configures the freeze protection temperature for the
circulation pump. When the space heating supply temperature remains
below the set value for more than 10 seconds, the boiler runs the
circulation pump to prevent damage from freezing. The pump runs for
10 minutes, and then stops for 1 minute.
Range Default
6 to 10
℃
10
℃
Eg.) 10
℃