Recovery Equipment Types
There are two main types of recovery equipment. Self-contained devices have their own compressor and can recover refrigerant regardless of whether the system compressor works. System-dependent devices rely on the system's own compressor or internal pressure differences to push refrigerant into the recovery container. All recovery equipment must be tested and certified by an EPA-approved laboratory.
Self-contained recovery devices have their own compressor; system-dependent devices rely on the system's compressor or pressure.
Liquid vs. Vapor Recovery
Liquid recovery is faster because liquid is denser than vapor, allowing more refrigerant to be moved in less time. The push-pull method is used for recovering large quantities of refrigerant: vapor from the recovery machine pushes liquid refrigerant out of the system into the recovery cylinder. Proper hose size matters because larger hoses reduce recovery time.
Liquid recovery is faster than vapor. The push-pull method is used for large charge quantities.
Recovery Requirements
Special Recovery Situations
When recovering from a system with a burned-out compressor, use appropriate filters to prevent acid and contaminants from damaging recovery equipment. Never mix different refrigerants during recovery, as this creates unknown pressure-temperature relationships. Mixed refrigerants must be sent to a certified reclaimer. Always use the vacuum pump oil recommended by the manufacturer.
Use filters when recovering from burned compressor systems. Never mix refrigerants during recovery.
Recovery Techniques Review
- Self-contained devices have their own compressor; system-dependent devices use the system's compressor or pressure.
- All recovery equipment must be EPA-certified to achieve specific vacuum levels.
- Liquid recovery is faster; push-pull method is used for large quantities.
- Recovery cylinders must never exceed 80% fill; never heat with open flame.
- Use filters when recovering from burned compressor systems to protect recovery equipment.