Navien NHB-055 Service Manual page 51

Item
(C) Lowest Outdoor
Temperature
Setting
(D) Highest Outdoor
Temperature
Setting
(E) Boost Interval
Time Setting
Version 1.0
This mode is used to configure the heat load type to be used with the
Outdoor Reset Control mode
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
-4°F(-20°C) ~ [Outdoor High Temperature
Set-point - 9°F(5°C)]
This mode is used to configure the heat load type to be used with the
Outdoor Reset Control mode
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
[Outdoor Low Temperature Set-point +
9°F(5°C)] ~ 104°F(40°C)
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°F(5°C) and the return temperature by
5°F(3°C) after a set time elapses.
Setting
Boost Interval Time 0-120 min (0 : OFF)
Space Heating Supply
(Fixed Value): 9°F(5°C)
Boost Temperature
Space Heating Return
(Fixed Value): 5°F(3°C)
Description
14°F(-10°C)
70°F(21°C)
Range Remarks
Default : OFF (0)
For Celsius (°C) mode;
ex) at - 10°C
For Fahrenheit (°F) mode;
ex) at 14°F
Default
Lowest Outdoor Reset is not used
For Celsius (°C) mode;
ex)at 21°C
For Fahrenheit (°F) mode;
ex) at 70°F
Default
Highest Outdoor Reset is not used
If Boost Interval Time set is
30 minutes
Display
NHB Service Manual 51