Navien NCB-180, Service Manual

Page: 51 / 149

48 NCB Service Manual Version 1.0
Item Description Display
(C) Lowest
Outdoor
Temperature
Setting
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.
Outdoor Low Temperature Setting Range
Setting range Default
-4
℉
(-20
℃
) ~ [Outdoor High Temperature
Set-point - 9
℉
(5
℃
)]
14
℉
(-10
℃
)
For Celsius (
℃
) mode; ex)
at - 10
℃
For Fahrenheit (
℉
) mode;
ex) at 14
℉
Lowest Outdoor Reset is
not used
(D) Highest
Outdoor
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
Outdoor Low Temperature Setting Range
Setting range Default
[Outdoor Low Temperature Set-point +
9
℉
(5
℃
)] ~ 104
℉
(40
℃
)
70
℉
(21
℃
)
For Celsius (
℃
) mode;
ex)at 21
℃
For Fahrenheit (
℉
) mode;
ex) at 70
℉
Highest Outdoor Reset is
not used
(E) Boost Interval
Time 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.
Setting Range Remarks
Boost Interval
Time
0-120 min (0 : OFF) Default: OFF (0)
Boost
Temperature
Space Heating Supply
(Fixed Value): 9
℉
(5
℃
)
Space Heating Return
(Fixed Value): 5
℉
(3
℃
)
If Boost Interval Time set
is 30 minutes
(F) Max Limited
Calorie for
Heating
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 (%)
Setting range Default
50-100% 100%
MAX limited calorie for
Space heating is 95%