Navien NCB-20LHWE Installation & Operation Manual page 49

Setting the Heat Load for the Outdoor Reset Control Mode
Display
This mode is used to con gure the heat load type to be used
with the Outdoor Reset Control mode.
A preset or user-de ned temperature range is selected
automatically based on the heat load type selected.
Types of Heat Load
Supply Set-
Heat Load
point Range
1. Finned
Tube 48.5–82°C
Baseboard
2. Fan Coil 60–82°C
3. Cast Iron
37.5–76.5°C
Baseboard
4. Low Mass
26.5–60°C
Radiant
5. High Mass
26.5–48.5°C
Radiant
6. Radiators 48.5–76.5°C
Supply Control:
7. Custom Absolute MIN/
MAX set point
Heat loads 1-6 show the preset temperature ranges based on
the load type selected, while heat load 7 provides a custom
temperature range. When the custom temperature range is in
use, the boiler operates based on the user–de ned "Absolute
Min" and "Absolute Max" temperature settings.
Description
Outdoor Reset heat load types
1: Finned tube baseboard
2: FAN coil
3: Cast iron baseboard
4: Low mass radiant
5: High mass radiant
6: Radiator
7: Custom
Outdoor Reset heat load not
selected
Return Set-
Remarks
point Range
38–63.5°C Default
46.5–63.5°C
30–59°C
21–46.5°C
21–38°C
38–59°C
Return Control:
User-
Absolute MIN/
de ned
MAX set point
Setting the Lowest Outdoor Temperature
Display
This mode is used to con gure 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
Range
-20°C – [Outdoor Max
Temperature set point - 5°C]
Setting the Highest Outdoor Temperature
Display
This mode is used to con gure the highest outdoor
temperature. The boiler will operate at the low end of the supply
or return set-point range at this outdoor temperature.
Outdoor High Temperature Setting Range
Range
[Outdoor Min Temperature set
point + 5°C] – 40°C
Description
Lowest outdoor temperature
(°C)
Lowest outdoor temperature
not in use
Remarks
Default: - 10°C
Description
Highest outdoor temperature
(°C)
Highest outdoor temperature
not in use
Remarks
Default: 21°C
Operating the Boiler 49