Only reset is possible. It is not possible to add an offset to the run hour counter.
6.34.8 Fan priority update
In parameter 6562, the priority update rate (hours between priority rearrange) is selected:
If the fan priority update is set to 0 hours, the order of priority will be fixed at: Fan A, fan B, fan C and fan D.
AGC 100 Designer's Reference Handbook
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Additional functions
DEIF A/S Page 101 of 152