Final answer:
When servicing an R-22 system, you cannot add or mix refrigerants, continue to use R-22 refrigerant for a system with a major leak, or release R-22 refrigerant into the atmosphere.
Step-by-step explanation:
When servicing an R-22 system, you CANNOT add or mix refrigerants. R-22 systems are specifically designed to use R-22 refrigerant, and adding a different type of refrigerant can lead to damage and improper functioning of the system.
In addition, you CANNOT continue to use R-22 refrigerant for a system that has a major leak. R-22 is being phased out due to its harmful effects on the environment, and it is important to repair any leaks and transition to an alternative refrigerant.
Furthermore, you CANNOT release R-22 refrigerant into the atmosphere. As mentioned earlier, R-22 is an ozone-depleting substance, and proper recovery and recycling methods should be followed to minimize environmental impact.