After leak testing with R22 and nitrogen, what should be the next step?

After completing leak testing with R22 and nitrogen, the next appropriate step is to recharge the system. During the leak testing process, the system is pressurized with nitrogen to identify any leaks. Once leak testing is successfully completed and no leaks are found, the technician needs to ensure that the system is safely recharged with the appropriate refrigerant, which in this case is R22.

Sealing the system is important, but it typically occurs after confirming that there are no leaks and before the addition of refrigerant. Venting refrigerants and nitrogen to open air is not an advisable or safe practice, as it can be harmful to the environment and is regulated in many areas. Starting the system would not be appropriate until it has been properly charged with refrigerant, as operating the system without the correct charge can lead to damage.

Hence, recharging is the logical next step following successful leak testing, ensuring that the system operates efficiently and effectively.