Navien NCB-180 Service Manual page 54

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
(Q) Return
temperature changes based on the return absolute MIN temperature
Absolute MIN
range.
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
the system, the boiler runs the circulation pump for 15 seconds in the
(R) AWS Operation
space heating mode before completing the process. The makeup water
Pressure
feeding valve operates only when there is no space heating or DHW
Setting
demand.
This menu may be used to initialize all the parameters set with the boiler.
To initialize all parameters.
(S) All Parameters
Press the + or – buttons to change the display "yes"
Initialization
Press the "Mode" button.
When "No" appears on the display again, press the "mode" button.
This menu may be used to set a new password to access the parameter
setting menu.
To set a new password:
1. Move to [T.PSC] and press the "Mode" button. The current password is
displayed, with the first digit flashing.
2. Press the + or – buttons to change numbers.
3. Press the [Diagnostic] button to change places.
4. When you are done setting the password, press the [Mode] button to
save it. The new password is displayed on the front panel for 3 seconds,
(T) Password
before the boiler returns to the parameter setting mode.
Change mode
Setting range
68℉(20℃) ~ [MAX Set-point - 18℉(10℃)]
Setting range
12-30 PSI
NOTE
If you do not press the [Mode] button for 10 seconds after setting a
new password, the new password is automatically saved and [T.PSC]
is displayed on the front panel.
Description
For Celsius (℃) mode; ex)
at 30℃
For Fahrenheit (℉) mode;
Default
ex) at 86 ℉
86℉(30℃)
If water pressure is 18 psi
Default
12 PSI
If entering <Parameter
Initializing mode>,
press [+] / [-] button,
or
When entering
<Password Change
mode>, the password set
will be displayed.
The 1st Segment of
password set flashes at
500ms intervals.
Display