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Before any MVAC system can be opened for service - whether to replace a compressor, repair a leak, or flush the system - all refrigerant must be recovered into approved containers. Using proper, certified recovery equipment is both a legal requirement under Section 609 and a critical environmental practice.
Section 609 requires that recovery equipment used on MVAC systems meet SAE (Society of Automotive Engineers) standards. Using non-certified equipment is a violation of the law.
The SAE publishes standards for MVAC service equipment. These standards define performance requirements, safety features, and certification criteria. Key SAE standards include:
| SAE Standard | Covers |
|---|---|
| SAE J2788 | R-134a recovery/recycling/recharging equipment - accuracy, efficiency, and design requirements |
| SAE J2843 | R-1234yf recovery/recycling/recharging equipment - includes A2L safety features |
| SAE J2099 | Standard of purity for recycled R-134a for use in mobile air conditioning systems |
| SAE J1771 | Technician certification for handling refrigerants in MVAC systems (the original 609 exam standard) |
| SAE J2297 | Ultraviolet leak detection in R-134a mobile air conditioning systems |
| SAE J1989 | Service procedure for recovery and recycling equipment for mobile AC systems (legacy standard) |
The exam most commonly references SAE J2788 (R-134a equipment) and SAE J2843 (R-1234yf equipment). Remember: R-1234yf equipment must meet a different, higher standard due to the A2L flammability classification.
Recovery-only machines remove refrigerant from the vehicle system and store it in a recovery cylinder. The refrigerant is NOT cleaned during this process. Recovery-only equipment:
R/R/R units are the industry standard for automotive AC shops. These machines perform all three functions:
R/R/R units allow refrigerant to be reused in the same shop immediately after recycling, reducing refrigerant costs and waste. They must meet SAE J2788 (R-134a) or SAE J2843 (R-1234yf) standards.
R-1234yf CANNOT be recovered or recharged using standard R-134a equipment. Because R-1234yf is mildly flammable (A2L), SAE J2843-compliant equipment must include additional safety features including leak detection, grounding, and explosion-proof components. Cross-contaminating these refrigerants can cause system failures and safety hazards.
Section 609 sets minimum recovery efficiency standards - the percentage of refrigerant that must be removed from the system before service. Equipment must meet these minimums:
| System Condition | Required Recovery Efficiency |
|---|---|
| System with operating compressor | 90% (by mass) or achieving 102 mm Hg vacuum |
| System without operating compressor | 80% (by mass) or achieving 102 mm Hg vacuum |
In practice, certified R/R/R machines are designed to exceed these minimums automatically. The machine will continue running until the system pressure reaches the required vacuum level.
Recovered refrigerant must be stored in DOT-approved recovery cylinders. These are different from new refrigerant cylinders:
Mixing refrigerants in a recovery cylinder renders the entire contents worthless - it cannot be recycled or reclaimed. The mixed refrigerant must be destroyed at significant cost. If you encounter an MVAC system with unknown refrigerant, use an identifier before recovering.
When the refrigerant type in a vehicle system is unknown - which is common with older vehicles or systems that may have been improperly serviced - a refrigerant identifier must be used before connecting recovery equipment.
Refrigerant identifiers analyze the gas composition and display the refrigerant type and purity. They can detect:
Proper procedure for connecting MVAC recovery equipment: