Best Practice:
First, they should prepare the system before brazing by removing the drier inside the condenser & install brazed copper tubing in its place.

Then a new properly sized filter drier should be installed on the liquid line exterior of the condenser.

If it is a copper coil they can purge the system with dry nitrogen & then flow it at just under 3-psig while they braze the hole & the other changes.

Then the system needs to be purged again & double or triple evacuated down to 500 microns, then down to 400 microns & see how well it holds.

Then they can weigh in a proper charge according to the size & length of the refrigerant lines.

Then after checking the airflow CFM & cleanliness of the coils & blower wheel blades, they can then use superheat, & subcooling if a TXV metering device, to balance the charge to the conditions of the heatload.

This is the "Best Practice," doubt they will do the practice to that extent. - udarrell

Here is a link that might be useful: Balancing the Refrigerant Charge to normal load conditions