What AHRI 700 actually is

AHRI Standard 700 (originally ARI 700) is the North American industry standard for refrigerant purity. It specifies the maximum allowable contaminant levels for refrigerants that have been reclaimed through chemical analysis, cleaning, and verification. A reclaimer operating under AHRI 700 certification must test each batch of refrigerant against the standard's limits before it can be sold as reclaimed refrigerant.

Reclaim is a higher standard than recycle. Recycled refrigerant is cleaned on-site by the technician and returned to the same owner for continued use in the same appliance; reclaimed refrigerant has been independently processed and verified to meet AHRI 700 purity, and it can be sold to any certified buyer.

The contaminants that AHRI 700 limits

AHRI 700 specifies purity limits for six categories of contaminant:

1. Moisture. Measured in parts per million by weight (ppm). Limits vary by refrigerant type — typically 10 to 20 ppm for HFCs, higher for some hydrocarbons.

2. Acidity. Measured as ppm by weight of hydrochloric acid (HCl). Limit is typically 1.0 ppm or less, depending on the refrigerant.

3. High-boiling residue. Volatile organic compounds that remain liquid at the evaporation temperature. Limit is typically 0.01 percent by weight.

4. Chlorides. Salt ions that indicate corrosion or contamination. Qualitative test — pass or fail, not a numeric limit.

5. Particulates. Solid debris visible through a clear sample. Visual test — must be "essentially clear."

6. Non-condensables. Gases (mostly air) that do not condense at refrigerant condensing temperatures. Measured by gas chromatography or pressure-temp relationship. Limit is typically 1.5 percent by volume at 25 °C for most refrigerants.

7. Other refrigerants. Cross-contamination from another refrigerant type. Must be below 0.5 percent for most pairs, lower for some specific pairs.

For each refrigerant, AHRI 700 has a specific table of limits. The Universal exam tests the principle (these contaminants must be controlled and tested) more than the exact number for each refrigerant — but knowing a few representative values (10 ppm moisture, 1.0 ppm acidity, 1.5 percent non-condensables) is sufficient for the exam.

The reclaim process

A reclaimer operating under AHRI 700 typically performs these steps:

1. Initial analysis — gas chromatography to identify the refrigerant and any cross-contamination.
2. Distillation — separates high-boiling contaminants.
3. Adsorption — passes the refrigerant through beds of molecular sieve and activated carbon to remove moisture and acid.
4. Filtration — removes particulates.
5. Final analysis — gas chromatography and titration to verify the result meets AHRI 700 limits.
6. Certification — a Certificate of Reclamation is issued, with a unique lot number that follows the cylinder through resale.

The reclaim process is regulated separately from recovery. Recovery is what a service technician does on a job site; reclaim is what a specialized facility does to return refrigerant to AHRI 700 purity.

The reclaim vs recycle distinction on the exam

This is one of the highest-yield distinctions on the Universal exam. Memorize it:

• Recover: Extract refrigerant from an appliance, in any condition, for the purpose of storage, transport, or disposal.
• Recycle: Clean recovered refrigerant on-site using recycling equipment; reuse in the same owner's appliance. Does NOT require AHRI 700 verification.
• Reclaim: Process recovered refrigerant to AHRI 700 purity at a certified facility; resale is legal.

The exam will offer a scenario where a technician cleans refrigerant using a recycling machine and asks whether the cleaned refrigerant can be sold. The answer is no — only AHRI 700 reclaimed refrigerant can be sold. Recycled refrigerant must be returned to the same owner for continued use in the same appliance.

Why the standard matters in the field

If you service a supermarket rack, you have a constant temptation to recover refrigerant, run it through your on-site recycler, and top off the system with the recycled refrigerant. That is legal — but only if the recovered refrigerant stays in the same appliance under the same owner.

If you recover refrigerant from an appliance that is being decommissioned and try to put that refrigerant into a different customer's system, that is illegal. You must either:

• Send the refrigerant to an AHRI 700 reclaimer and buy back AHRI 700 reclaimed refrigerant, or
• Document that you are transferring refrigerant under the same operator between appliances owned by the same operator, which is permitted under specific conditions.

The exam makes this distinction clearly. Read the scenario's wording about ownership.

The 2024 AIM Act changes

The AIM Act and EPA's HFC management rule have layered additional requirements on top of AHRI 700:

• Reclaimed HFC percentage requirements — equipment sold with HFC refrigerants must contain increasing percentages of reclaimed material over time.
• Allocation tracking — HFCs produced or imported are tracked through a quarterly allowance system.
• Labeling requirements — cylinders containing reclaimed HFCs must be labeled "Reclaimed HFC" and may not be sold as "virgin" refrigerant.

For a technician buying R-410A today, expect to see reclaimed-content cylinders as a normal part of the supply mix. Verify the cylinder label and confirm the lot number.

Common exam traps

• Believing that recycled refrigerant can be sold. It cannot.
• Confusing AHRI 700 with AHRI 740. AHRI 740 is the standard for recovery/recycling equipment performance; AHRI 700 is for refrigerant purity.
• Forgetting the Certificate of Reclamation. Every AHRI 700 cylinder must have one; it is the document that proves the refrigerant can be legally sold.
• Assuming "refrigerant in a cylinder" is automatically legal. It is not; the cylinder must be within its hydrostatic test date, and the refrigerant must be properly documented.

A practical closing note

AHRI 700 is the technical backbone of the refrigerant economy. Every reclaimed cylinder you buy from a wholesaler has passed these limits, and every lot is traceable to the reclaimer that processed it. The standard exists so that reclaimed refrigerant performs identically to virgin refrigerant — without the environmental cost. Memorize the contaminant categories and the reclaim vs recycle distinction; together they account for several questions on the Universal exam.