Navien NCB-180 Installation & Operation Manual page 56

Setting the Pump Overrun Time
Display
Pump overrun time (min)
S psi
R O/R
The pump overrun time is the duration that the circulation
pump will continue to run when the space heating supply or
return temperatures reach the set values for boiler operation
stop temperatures and the burner turns off. If the space heating
supply or return temperature remains out of the boiler operation
temperature range after the set time, the boiler stops the pump for
10 minutes, runs it again for 5 minutes, and then repeats the cycle.
Default: 40 minutes
●
Setting Range: 3-40 minutes
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Setting the DHW Max Heat Capacity
Display
DHW max heat capacity (%)
S psi
R O/R
This menu is used to configure the desired DHW capacity. When
the boiler operates in the Normal mode, the DHW capacity is
limited to the set value (%).
Default: 100%
●
Setting Range: 50-100%
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Setting the DHW Wait Time
Display
DHW wait time (min)
S R O/R psi
The DHW wait time is the duration that the boiler maintains the
DHW supply mode after a DHW demand. With the DHW wait time
enabled, a faster DHW supply may be available when there is a
subsequent DHW demand. The boiler switches the 3-way valve to
space heating mode when the set time elapses.
Default: 5 minutes
●
Setting Range: 0-20 minutes
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Description
Description
Description
Setting the Burner-Off Temperature
Display
Burner-off temperature (°F)
S psi
R O/R
During space heating, the boiler turns off the burner when the
space heating supply temperature meets or exceeds the burner-off
temperature.
Burner-Off Temperature Range
Range
0-54°F (0-30°C)
Setting the Burner-On Temperature
Display
Burner-on temperature (°F)
S psi
R O/R
During space heating, the boiler turns on the burner when
the space heating supply temperature is below the burner-on
temperature.
Burner-On Temperature Range
Range
5-54°F (3-30°C)
Description
Remarks
Default: 0°F (0°C)
Description
Remarks
Default: 5°F (3°C)
Operating the Boiler 55