Navien NCB-180 Service Manual page 51

Item
This mode is used to configure the lowest outdoor temperature. The boiler
will operate at the high end of the supply or return set-point range at this
outdoor temperature.
(C) Lowest
Outdoor
Outdoor Low Temperature Setting Range
Temperature
Setting
This mode is used to configure the highest outdoor temperature. The
boiler will operate at the high end of the supply or return set-point range
at this outdoor temperature
(D) Highest
Outdoor
Outdoor Low Temperature Setting Range
Temperature
Setting
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 9℉(5℃) and the
return temperature by 5℉(3℃) after a set time elapses.
(E) Boost Interval
Time Setting
This menu is used to configure the desired space heating capacity. When
the boiler operates in the Normal mode, the space heating capacity is
limited to the set value (%)
(F) Max Limited
Calorie for
Heating
48 NCB Service Manual
Description
Setting range
-4℉(-20℃) ~ [Outdoor High Temperature
Set-point - 9℉ (5℃)]
Setting range
[Outdoor Low Temperature Set-point +
9℉(5℃)] ~ 104℉(40℃)
Setting Range
Boost Interval
0-120 min (0 : OFF)
Time
Space Heating Supply
Boost (Fixed Value): 9℉(5℃)
Temperature
Space Heating Return
(Fixed Value): 5℉(3℃)
Setting range
50-100%
Default
14℉ (-10℃)
Default
70℉ (21℃)
Remarks
Default: OFF (0)
Default
100%
Display
For Celsius (℃) mode; ex)
at - 10℃
For Fahrenheit (℉) mode;
ex) at 14℉
Lowest Outdoor Reset is
not used
For Celsius (℃) mode;
ex)at 21℃
For Fahrenheit (℉) mode;
ex) at 70℉
Highest Outdoor Reset is
not used
If Boost Interval Time set
is 30 minutes
MAX limited calorie for
Space heating is 95%
Version 1.0