Navien NCB-24LSWE Installation & Operation Manual page 45

Setting the Boost Interval Time
Display
The boost interval time may be set to prevent interruption in
space heating while using the Outdoor Reset Control mode,
due to changes in heat load conditions. With the boost interval
time enabled, the boiler increases the space heating supply
temperature by 5°C and the return temperature by 3°C after a
set time elapses.
Boost Interval Time and Temperature Setting
Setting Range
Boost Interval
OFF (0), 1–120 min
Time
Space Heating Supply (Fixed
Value): 5°C
Boost
Temperature
Space Heating Return (Fixed
Value): 3°C
Setting the Max Heat Capacity for Space Heating
Display
This menu is used to configure the desired space heating
capacity. When the boiler operates in the Normal mode, the max
space heating capacity is limited to the set value (%).
Space Heating Max Heat Capacity Setting Range
Range
[Space Heating Min Heat
Capacity set point + 20%] –
100%
46 Operating the Boiler
Description
Boost interval time (min)
Remarks
Default:
OFF (0)
Description
Space heating max heat
capacity (%)
Remarks
Default: 100%
Setting the Min Heat Capacity for Space Heating
Display
This menu is used to configure the desired space heating
capacity. When the boiler operates in the Normal mode, the min
space heating capacity is limited to the set value (%).
Space Heating Min Heat Capacity Setting Range
Range
Space Heating Min Heat
Capacity – [Space Heating Max
Heat Capacity set point - 20%]
Setting the Pump Freeze Protection Temperature
Display
This menu is used to configure the circulation pump freeze
protection temperature.
When the space heating supply temperature stays below the set
value for longer than 10 seconds, the boiler runs the circulation
pump to prevent freeze damage (the pump runs for 10 minutes,
then stops for 1 minute).
Default: 10°C
●
Range: 6–10°C
●
Description
Space heating min heat
capacity (%)
Remarks
Default: Space heating min
heat capacity (%)
Description
Pump freeze protection
temperature (°C)