Navien NCB300-28K Installation & Operation Manual page 57

Condensing combi boiler
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Press the Info button (
menu.
Item
1. Fan Motor
2. Boiler Pump
3. 3 Way Valve
56
Operating the Boiler
) 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 Plus button (
or the Minus button (
toggle the valve operation
[On (DHW) -> Off (CH)/Off
(CH) -> On (DHW)].
10.7.3 Setting the Special Operation Modes
To Set the boiler's operation parameters, press the ECO button
(
) and Menu button (
then select "3. OPR"
5sec
Press the Plus button (
between the operation modes. Press the ECO button (
select an operation mode.
The boiler resumes operation in normal operation mode if no
input is detected for 3 hours.
Press the Info button (
menu.
Item
oPE.0 (Normal)
oPE.1 (Min)
)
) to
oPE.2 (CH MAX)
oPE.3 (DHW MAX)
) simultaneously 5 seconds, and
) or the Minus button (
) to switch
) to return to the previous screen or
Description
Set the boiler to run in normal
operation mode.
Set the boiler to run in
minimum operation mode.
Set the boiler to run in central
heating maximum operation
mode.
Set the boiler to run in DHW
maximum operation mode.
) to

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