Navien NCB700-42C Installation & Operation Manual page 53

Press the Up button (
between the test procedures. Press the OK button (
test procedure.
During the test mode, the boiler stops combustion.
Note
Press the Back button (
menu.
Item
1. Fan Motor
2. Boiler Pump
3. 3 Way Valve
4. Dual Venturi
52 Operating the Boiler
) or the Down button ( ) to switch
) to return to the previous screen or
Description
Test the fan operation.
From a stopped state, the fan
speed gradually increases and
reaches the maximum speed
at 6500 RPM, and then the fan
speed decreases until the fan
stops operating.
Except for the Power
Note
button ( ), the
buttons do not work
during fan motor test
mode.
Test the boiler pump operation.
On (10 seconds) -> Off (5 seconds)
-> On (10 seconds) for 5 boiler
pump operation cycles
Except for the Power
Note
button ( ), the
buttons do not work
during boiler pump
test mode.
Test the 3 way valve operation.
The 3 way valve is turned on
●
as soon as you enter the test
mode.
Press the OK button (
●
toggle the valve operation
[On (DHW) -> Off (CH)/Off
(CH) -> On (DHW)].
Test the dual venturi operation.
Press the OK button (
to toggle the dual venturi
operation [On (DHW) -> Off (CH)
-> On (DHW)].
10.7.5 Setting the Special Operation Modes
) to run a
To operate the boiler in special operation modes, press the Back
button (
3 seconds, and then select "5. Special Operations".
Press the Up button (
between the operation modes. Press the OK button (
select an operation mode.
The boiler resumes operation in normal operation mode if no
input is detected for 3 hours.
Press the Back button (
menu.
1. Normal
2. 1st MIN
) to
3. 1st MAX
4. CH 2nd MAX
)
5. DHW 2nd MAX
6. 2nd MIN
) and the Menu button ( ) simultaneously for
) or the Down button (
) to return to the previous screen or
Item
Set the boiler to run in normal
operation mode.
Set the boiler to run in 1st stage
minimum operation mode.
Set the boiler to run in 1st stage
maximum operation mode.
Set the boiler to run in 2nd
stage central heating maximum
operation mode.
Set the boiler to run in
2nd stage DHW maximum
operation mode.
Set the boiler to run in 2nd
stage minimum operation
mode.
) to switch
) to
Description