How do you charge a compound refrigerant into a operating system?

To charge a compound refrigerant into an operating system, first ensure that the system is running and that you are using the correct refrigerant type. Connect the refrigerant canister to the low-pressure service port, then gradually open the valve to allow the refrigerant to flow into the system while monitoring the pressure gauges. Maintain the appropriate pressure levels as specified by the manufacturer, and ensure to avoid overcharging. Finally, check for any leaks and ensure the system is operating efficiently after the charging process.