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O2 Probe field calibration instruction
It's important to calibrate the O2 Probe periodically in order to achieve accurate oxygen measure-
ment and maintain optimum combustion efficiency. Calibration of the probe can be accomplished by
the following steps:
1. Start a burner cycle.
2. At the pre-purge phase, place the Burnerlogix FSG (or equivalent) in "check mode" by utilizing
the RUN/CHECK slide switch located on the side of the Burnerlogix control. When in check mode,
the FSG will stay in the pre-purge state indefinitely.
3. Keep system in pre-purge for at least 5 minutes in order to purge all traces of burnt/unburnt fuel.
This purge time is needed to create the free-air (20.95% oxygen concentration) condition that is
expected in order for the probe to calibrate properly. Extended purge time may be required for larger
systems.
Note: System with multiple boilers with common flue gas outlet should be managed properly to
avoid "fouling" of the probe with stack gases generated by adjacent boiler in operation.
4. After 5 minutes (or more) purge time, go to the PPC4000 display (NXD410 or Touchscreen) and
navigate to the O2 SETUP menu.
5. Initiate the O2 probe calibration by executing the CALIBRATE NOW option. Calibration time is
less than 15 seconds.
6. Observe the O2 reading after calibration to make sure that the O2 readout is about (20.8% ±
0.1%).
7. Upon successful calibration, remove the FSG from check mode to allow the system to continue
normal burner sequence.
