Navien NCB-150E Service Manual page 53

Item
This menu may be used to make changes to the maximum return
temperature range the Return Control mode is in use. When configuring the
Custom mode in the Outdoor Reset Control mode, the return temperature
(P) Return Absolute changes based on the return absolute MAX temperature range.
MAX Set-point
This menu may be used to make changes to the minimum return temperature
range the Return Control mode is in use. When configuring the Custom mode
in the Outdoor Reset Control mode, the return temperature changes based
(Q) Return Absolute
on the return absolute MIN temperature range.
MIN Set-point
This menu may be used to allow the boiler to maintain the space heating
system water pressure to ensure that a sufficient amount of water is in the
system. When the system pressure falls 4 PSI below the set value, the boiler
opens the makeup water feeding valve for a maximum of 2 minutes until
the system is filled and water pressure exceeds the set value. After filling
(R) AWS Operation
the system, the boiler runs the circulation pump for 15 seconds in the space
Pressure setting heating mode before completing the process. The makeup water feeding
valve operates only when there is no space heating or DHW demand.
This menu may be used to set the number of water heaters initially activated
during DHW stand-by periods.
(S) Initial operating
unit number setting
52 NCB-E Service Manual
Description
Setting range
[MIN Set-point + 18°F(10°C)] - 158°F(70°C)
Setting range
68°F(20°C) - [MAX Set-point - 18°F(10°C)]
Setting range
12-30 PSI
Setting range
0-16
Display
For Celsius (°C) mode;
ex) at 65°C
For Fahrenheit (°F) mode;
Default
ex) at 149°F
149°F(65°C)
For Celsius (°C) mode;
ex) at 30°C
For Fahrenheit (°F) mode;
Default
ex) at 86°F
86°F(30°C)
If water pressure is 18 psi
Default
6 PSI
If initial operating water heaters
number is 3
Default
0
Version 1.4