Navien NCB500-2S/37K Service Manual page 113

112 Inspection and Maintenance Schedule
SET BOILER TO MAXIMUM RATE
In accordance with boiler instructions, set
boiler to operate at maximum rate (full load
combustion to stabilise.
Do not insert analyser probe during this
Note
period to avoid possible "flooding" of sensor.
CARRY OUT FLUE INTEGRITY CHECK USING ANALYSER
Insert analyser probe into air inlet test point and allow readings to
stabilise.
where no air inlet test point is provided then a flue integrity check
Note
with the analyser is not possible. The installer should verify that
flue integrity has been visually checked in accordance with the
yellow "Prior to CO and combustion ratio check" box above before
proceeding to the "Check CO and combustion ratio at maximum
rate" stage below.
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