40
7 O
2
Trim
7O
2
Trim
7.1 What happens if a fault occurs in the O
2
trim?
In the event of perturbations, a warning message would be displayed and the O
2
controller
would be deactivated. The specified base value "Without control” or the one for "Air shortage”
is set. The display shows the running text "O
2
trim perturbed”.
The burner is not shut down as a rule.
The corresponding error code can be called up by setting the selector switch to "Status". A
plain text message about the cause of error appears after pressing "Enter".
7.2 Air Deficiency Failure
If the O
2
actual value is significantly smaller than the O
2
setpoint value (below the second
monitoring band) and corrective actions by the ETAMATIC OEM cannot clear this error, then
the trim is deactivated and the base value for air deficiency errors will be put out.
At air deficiency, the ETAMATIC OEM triggers an air deficiency burner shut-down. Therefore
set P 897 to 1.
The error code is H360, "Error shut-down by O
2
trim”.
7.3 Resetting O
2
Errors
O
2
errors are automatically reset with each new burner start-up. This is permissible, since a
100% O
2
measurement test is performed at each start-up.
Manual resetting of O
2
errors is possible at any time, as follows:
press key ETAMATIC OEM in O
2
trim mode
if not, switch over to O
2
trim mode (press key F4 one time)
press "Enter" and call up the cause of error (mandatory!)
press key 7
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