37
6 O
2
Trim
6.4 Calling Fault History O
2
trim
Display:
The display hides the O
2
history automatically after 5 sec. O
2
trim faults, which last for more
than 30 sec are stored. They are only stored in the EEPROM once the fault is cleared up or
the ETAMATIC leaves the operating mode or control or base firing rate.
6.5 Automatic Function Monitoring During Operation
6.5.1 Test During Burner Start
The actual O
2
value is checked to ensure that during pre-purge it corresponds to the air value
(equal to or greater than 18 vol.% O
2
and less than 24 vol.% O
2
).
After ignition, the actual O
2
value must reach a value equal to or below 14% within 45 seconds.
Reaching the threshold value is monitored. If one of the two parameters is not met, O
2
trim is
deactivated. The control unit outputs the value “Base value without control”.
Switch over to fuel/air ratio control mode, if necessary press M.
Use key 4 and 5 to browse the fault history.
1 147 1 000 487
current fault internal firing
rate
curve set operating hours
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