Does the freezer need to be on the flow chart as a preventative control
Does the freezer need to be on the flow chart as a preventative control
If you mean HACCP flow, yes it needs to be there and risk assessed- normally part of your prerequisite program.
Would have to see more of your process to know if your freezer is a PC, maybe for you it's just a step in the process
However, ALL steps need to be included on your flow chart, regardless of PC, CCP or a simple process step
Yes
Does the freezer need to be on the flow chart as a preventative control
If you're storing material in it that alone will put it on the flow chart.
If you're making a claim that your storage temperature is preventing spoilage or pathogen growth, that would be a fairly standard biological preventative control.