Navien NCB-24LSWE, Service Manual

Page: 49 / 144

NCB Service Manual 47 Version 1.0
Item Description Display
(A) Outdoor
Reset This mode is used to configure the Outdoor Reset Control.
By default, the mode is disabled.
Outdoor reset in use
Outdoor reset not in use
(B) Heating
System
outdoor
reset
control
This mode is used to configure the type of heating system that Outdoor
Reset Control mode is used with.
A preset or user-defined temperature range is automatically selected
based on the selected heating system.
Heating system
Supply CH set
point range
Return CH
set point
range
Remarks
1. Finned tube
baseboard
48.5-82.0
℃
38.0-63.5
℃
Default
2. Fan coil
60.0-82.0
℃
46.5-63.5
℃
3. Cast iron
baseboard
37.5to76.5
℃
30.0 to 59.0
℃
4. Low mass
radiant
26.5to 60.0
℃
21.0 to 46.5
℃
5. High mass
radiant
26.5 to 48.5
℃
21.0 to 38.0
℃
6. Radiator
48.5 to 76.5
℃
38.0 to 59.0
℃
7. Custom
CH supply
control,
absolute
min/max set
points CH return
control
absolute
min/max set
points
User-
defined
Heating systems 1-6 use a preset temperature range based on the
selected system. The temperature range for System 7 can be customised.
When a customised temperature range is used, the boiler operates based
on user-defined “Absolute Min” and “Absolute Max” temperature
settings.
Outdoor reset heat
system type 1
Outdoor reset heating
system not selected
(C) Lowest
outdoor
temperature
This mode is used to configure the lowest outdoor temperature setting.
The boiler will operate at the highest setting in the supply or return
temperature setting range for that temperature.
Outdoor Low Temperature Setting Range
Range Default
-20
℃
to (Outdoor high temperature set point - 5
℃
) -10
℃
Lowest outdoor
temperature (°C)
Lowest outdoor
temperature not used