What is the maximum allowable moisture level in recycled R-12 that is to be returned to a mobile air conditioning system?

The maximum allowable moisture level in recycled R-12 that is to be returned to a mobile air conditioning system is set at 15 parts per million (PPM) by weight. This standard is crucial because moisture in refrigerants can lead to several issues, including corrosion of system components, reduced efficiency, and potential failure of the air conditioning system. Maintaining low moisture levels helps ensure the reliability and longevity of the system, as moisture can react with other chemicals in the refrigerant or the lubricating oil, leading to the formation of acidic compounds. By adhering to the 15 PPM moisture level, technicians can help maintain optimal performance and prevent damage to the system.