Navien NCB-180, Service Manual

Page: 52 / 149

Item Description Display
(G) Pump Freezing
Temperature
Setting
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).
Setting range Default
43-50
℉
(6-10
℃
) 50
℉
(10
℃
)
For Celsius (
℃
) mode; ex)
at 10
℃
For Fahrenheit (
℉
) mode;
ex) at 50
℉
(H) Anti Fast
Cycling Time
The anti-fast cycling time is the duration that the boiler stops its space
heating operation when the space heating supply or return temperatures
reach the set values for boiler operation stop temperatures. The boiler will
not resume space heating until the duration elapses, even when the space
heating supply or return temperatures return to within the set ranges.
Setting range Default
0-20 minutes 3 minutes
If Anti Fast Cycling Time
set is 3 minutes
(I) CH Pump Over-
run Time
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.
Setting range Default
3-40 minutes 40 minutes
If CH PUMP Over-run
Time set is 40 minutes
(J) Max Limited
Calorie for Hot
water
This menu is used configure the desired DHW capacity. When the boiler
operates in the Normal mode, the DHW capacity is limited to the set value
(%)
Setting range Default
50-100 % 100 %
If Max limited hot water
calories is 100%
(K) DHW Wait Time
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.
Setting range Default
0-20 minutes 5 minutes
If DHW Wait Time set is 5
minutes