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When O3 / Sanitizer is turned ON, the knob right away moves to the LOW setting (9 o'clock position). Is this normal?

Yes, this is normal. The LOW O3 / Sanitizer setting (ozone output) equates to approximately 500 sq.ft. coverage on all machines. This is what you should start with no matter how big your house is, and then test from there to see if you actually need a higher O3 / Sanitizer setting.