Navien NCB-24LSWE Service Manual page 49

Item
(A) Outdoor This mode is used to configure the Outdoor Reset Control.
Reset By default, the mode is disabled.
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.
(B) Heating
System
outdoor
reset
control
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.
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.
(C) Lowest
Outdoor Low Temperature Setting Range
outdoor
temperature
Version 1.0
Supply CH set
Heating system
point range
1. Finned tube
48.5-82.0℃
baseboard
60.0-82.0℃
2. Fan coil
3. Cast iron
37.5to76.5℃
baseboard
4. Low mass
26.5to 60.0℃
radiant
5. High mass
26.5 to 48.5℃
radiant
48.5 to 76.5℃
6. Radiator
CH supply
control,
absolute
7. Custom
min/max set
points
Range
-20 ℃ to (Outdoor high temperature set point - 5 ℃ )
Description
Return CH
set point
range
38.0-63.5℃
46.5-63.5℃
30.0 to 59.0℃
21.0 to 46.5℃
21.0 to 38.0℃
38.0 to 59.0℃
CH return
control
absolute
min/max set
points
Display
Outdoor reset in use
Outdoor reset not in use
Outdoor reset heat
system type 1
Remarks
Default
Outdoor reset heating
system not selected
User-
defined
Lowest outdoor
temperature (°C)
Lowest outdoor
temperature not used
Default
-10 ℃
NCB Service Manual 47