Navien NCB-24LSWE, Руководство по обслуживанию, Страница: 24 / 144

22 NCB Service Manual
Version 1.0
4. Remove the boiler’s front cover by loosening the 4
Phillips head screws securing it to the case.
CAUTION
Ensure that no cables obstruct the
PCB assembly before inserting it in
position. If the assembly is stuck, do
not force it. Doing so may damage
the cables and result in serious
malfunction.
Check again to ensure that no cables
or any other parts obstruct the PCB
before proceeding.
5. Loosen the screw indicated in the figure below and
connect a manometer to the pressure port. Reset the
manometer to zero before use.
6. Re-open the manual gas valve and check for leaks.
7. Open multiple hot water outlets that that have high
flow rates, such as bathtub taps and shower mixers,
to allow the boiler to operate at its maximum firing
rate.
8. When the boiler reaches the maximum firing rate,
check the inlet gas pressure reading on the
manometer. The gas pressure must be within the
operating range listed in the specifications on page
17.