Yes, a vacuum pump can be used to recover refrigerant from air conditioning systems. To do so, the system must be isolated and all of the components should be checked for any leaks. The vacuum pump should then be connected to the service port of the system and turned on. Here are some steps one needs to take when using a vacuum pump:
• Ensure that all valves in the system are closed before connecting the vacuum pump
• Make sure that there is no debris or condensation within the lines
• Connect hoses securely and use appropriate fittings
• Monitor levels regularly while recovering refrigerant
• Check for leaks after recovery has been completed