6.2 Recovery Equipment Requirements

Why Equipment Certification Matters

You cannot legally pull refrigerant with just any vacuum pump. Under 40 CFR Part 82, Subpart F, all recovery and recycling equipment must be certified by an EPA-approved testing organization before it can be sold or used. EPA has approved two such organizations: the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) and Underwriters Laboratories (UL).

Certified machines carry a label reading, in effect, "This equipment has been certified by AHRI/UL to meet EPA's minimum requirements for recovery/recycling equipment intended for use with [appliance category]." Expect the exam to ask which organizations certify equipment — the answer is AHRI and UL, not EPA itself and not DOT.

The certification proves the machine can pull refrigerant down to the legally required recovery levels. Machines are tested against a version of the AHRI 740 test protocol, and the exact appendix depends on the manufacturing date — this is the "grandfather" structure the exam loves to probe.

Equipment Grandfather Dates

The date November 15, 1993 is the single most-tested cutoff in this chapter. Equipment built on or after that date must reach deeper evacuation levels than older machines, because the technology had improved. The 2017 split into Appendix B3 (non-flammable) and B4 (flammable) was added so machines could be certified to handle newer A2L mildly flammable refrigerants such as R-32 and R-454B safely.

Self-Contained vs. System-Dependent Recovery

EPA recognizes two fundamentally different machine architectures, and the difference controls what size system you may legally service with each.

Self-Contained (Active) Recovery Equipment

• Has its own compressor or pump and can pull refrigerant out without any help from the appliance.
• Works whether or not the appliance's own compressor still runs.
• Faster, more reliable, and required for larger systems.
• No upper size limit — may be used on appliances of any charge.

System-Dependent (Passive) Recovery Equipment

• Has no compressor of its own; it relies on the appliance's pressure or the appliance's own compressor to push refrigerant into the recovery container.
• Cheaper and simpler, but slower and useless if the system has no pressure and a dead compressor (then only gravity/liquid recovery works).
• Legally limited to appliances containing 15 pounds of refrigerant or less.

This 15-pound ceiling is a frequently tested fact: you may never use system-dependent equipment on an appliance with more than 15 lb of refrigerant. Above that, a self-contained machine is mandatory.

Recovery on Small Appliances vs. Larger Systems

A small appliance is any product fully manufactured, charged, and hermetically sealed in a factory with 5 pounds or less of refrigerant — household refrigerators and freezers, window and PTAC room air conditioners, dehumidifiers, drinking-water coolers, vending machines, and under-counter ice makers. Recovery requirements for small appliances are stated as a recovery efficiency, not a single vacuum number:

• Compressor operating (working): recover 90% of the nameplate charge, or reach a 4-inch Hg vacuum.
• Compressor not operating (inoperative): recover 80% of the nameplate charge, or reach a 4-inch Hg vacuum.

A handy memory hook: a working compressor helps, so you can pull more out — 90%. A dead compressor makes recovery harder — only 80% is required. Larger (non-small) appliances are not measured by a percentage; they are evacuated to the inches-of-mercury levels covered in Section 5.3.

Recovery Equipment Quick Reference

Example: A technician must recover R-134a from an inoperative household refrigerator (nameplate charge listed). Because the compressor is dead, the machine must achieve either 80% of the nameplate charge or a 4-inch Hg vacuum — meeting either one satisfies the rule. If that same refrigerator's compressor were still running, the bar would rise to 90% or 4-inch Hg vacuum.

For the Exam: Equipment is certified by AHRI or UL; system-dependent machines are capped at 15 lb; small-appliance recovery is 90% (compressor on) / 80% (compressor off), or 4 in. Hg either way; never refill a DOT-39 disposable cylinder, and never fill any recovery cylinder past 80%.