AC Refrigerant Charging System Car Air Conditioning Recovery for Freon R134a. Recovery: Recovery refrigerant automatically, and the refrigerant meet the SAE standard. Charge: Charge refrigerant into the perfectly sealed air condition system. Manual operation to purge the waste compressor oil and charge the new oil. Vacuuming: Draw out air from conditioner. Equipped with filter device to eliminate moisture and impurities. Separate compressor oil from the refrigerant and charge new oil.