Navien NCB-180 Installation & Operation Manual page 54

Types of Heat Load
Supply Set-
Heat Load
point Range
1. Finned Tube 120-180°F
Baseboard (48.5-82°C)
140-180°F
2. Fan Coil
(60-82°C)
3. Cast Iron 100-170°F
Baseboard (37.5-76.5°C)
4. Low Mass 80-140°F
Radiant (26.5-60°C)
5. High Mass 80-120°F
Radiant (26.5-48.5°C)
120-170°F
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–defined "Absolute Min" and
Absolute Max" temperature settings.
Setting the Lowest Outdoor Temperature
Display
Lowest outdoor temperature (°F)
S psi
R O/R
Lowest outdoor temperature not
in use
S R O/R psi
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.
Return Set-
Remarks
point Range
101-147°F
Default
(38-63.5°C)
116-147°F
(46.5-63.5°C)
86-139°F
(30-59°C)
70-116°F
(21-46.5°C)
70-101°F
(21-38°C)
101-139°F
(38-59°C)
Return Control:
User-
Absolute MIN/
defined
MAX Set-point
Description
Outdoor Low Temperature Setting Range
Range
-4°F (-20°C) ~ [Outdoor High
Temperature Set-point - 9°F
(5°C)]
Setting the Highest Outdoor Temperature
Display
Highest outdoor temperature (°F)
S R O/R psi
Highest outdoor temperature not
in use
psi
S R O/R
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 High Temperature Setting Range
Range
[Outdoor Low Temperature
Set-point + 9°F (5°C)] ~ 104°F
(40°C)
Remarks
Default: 14°F (-10°C)
Description
Remarks
Default: 70°F (21°C)
Operating the Boiler 53