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It would depend, different system with different refigerants would all need purging.

I would do it differently for a commercial system compared to an industrial system.

On commercial systems when there should always be pressure I always purge from the low side, all the way through to the high side of my gauges, on industrial where there may be a vacuum on the suction side I purge from high to low.

If I have a refrigerant bottle I somtimes purge with that.

It is horses for courses for me because I work on so many different types of equipment.

I try not to purge with liquid if I can avoid it.

cool runnings

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