49
6 O
2
Trim
If a fault occurs in the O
2
trim will be deactivated, and depending on the cause the preset cor-
rection value for "Deactivated O
2
control” or "Air deficiency” would be shown as
output. The burner does not shut down.
In the event of an "Air deficiency fault” you can enforce a burner shutdown with parameter 897.
you can select the base values for deactivated O
2
trim and air deficiency in the parameter 896.
Recommended settings:
for P 901 / P 902 and P 917 / P 918
Base value for deactivated O
2
trim = neutral value
Base value for air deficiency < base value for deactivated O
2
trim
NOTICE
The neutral value is obtained from the selected correction mode:
+50%/-50% neutral value 500 = 50% correction mode
+60%/-40% neutral value 600 = 60%
The following approximate overall picture results for burner output:
Fig. 6-4 factory settings
8 → correction input base value for deactivated O
2
trim
P 901/P 902
9 → correction input base value for air deficiency
P 917/P 918
Parameter Factory Settings
901/902 Base value for “Deactivated O
2
trim” = 300
917/918 Base value for "Air deficiency” = 150
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