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Refrigerant Recovery Procedures Reference

Reference Process Updated Jun 19, 2026 · HVAC · Appliance Repair

Why this matters

Federal law (EPA Section 608) requires recovery of refrigerant from any system before opening for service. Venting refrigerant to atmosphere is illegal - penalties are severe. Recovery also recovers the customer's refrigerant for potential reuse OR proper disposal. The tech who recovers correctly maintains certification + avoids fines + does right by the planet. This is the field card.

EPA 608 in one paragraph

EPA Section 608 of the Clean Air Act regulates refrigerant handling. Four certification tiers: Type I (small appliances ≤5 lb), Type II (high-pressure systems - residential AC, heat pumps), Type III (low-pressure systems - chillers), Universal (all three). Service techs on residential AC need Type II minimum; Universal preferred. Certification is for life unless revoked. Refrigerant cannot be vented; must be recovered; recovery equipment must be EPA-certified.

Recovery equipment

Recovery machine: refrigerant-pumping device that pulls refrigerant from the system + pushes it into a recovery cylinder. EPA-certified (look for AHRI-700 testing).

Recovery cylinder: DOT-approved tank for storing recovered refrigerant. Color-coded by refrigerant type (R-22 light green, R-410A rose, mixed/contaminated YELLOW with grey).

Manifold gauges: connect to system service ports + recovery machine. Read pressures during recovery.

Hoses: refrigerant-rated hoses with ball valves at machine end (prevent loss during disconnect).

Recovery levels (EPA)

The system must be pulled down to specific vacuum levels before opening:

For systems containing more than 200 lb of refrigerant (commercial):

  • 0 inHg vacuum for normal recovery
  • Specific levels for individual refrigerants

For systems containing less than 200 lb (residential):

  • 0 psig (atmospheric) for high-pressure refrigerants OR
  • 4 inHg vacuum if recovery equipment manufactured pre-1993
  • 10 inHg vacuum if recovery equipment manufactured post-1993

Most residential recovery: pull to 0 psig minimum. Deeper vacuum = more refrigerant recovered.

Pre-recovery checklist

  1. Verify recovery cylinder NOT overfilled (80% max by weight; cylinder has stamped tare weight + max gross weight)
  2. Verify recovery machine has correct oil level (depends on machine; check manual)
  3. Verify hoses + fittings rated for refrigerant
  4. Verify recovery cylinder matches refrigerant type (DON'T mix refrigerants in cylinder)
  5. Sufficient ventilation if working indoors

Basic recovery procedure

  1. Identify refrigerant in the system (label on outdoor unit; equipment nameplate). NEVER assume.

  2. Connect manifold gauges to high + low service ports

  • Yellow center hose to recovery machine inlet
  • Recovery machine outlet to cylinder

  1. Open service valves on system (if equipped; mid-position on king valves)

  2. Open recovery machine + cylinder valves

  3. Start recovery machine + open manifold valves

  • High side first (pulls liquid faster)
  • Low side second (vapor)
  1. Monitor pressures + cylinder weight
  • System pressure drops
  • Cylinder weight increases
  1. Pull to required vacuum (per EPA level above)
  • Watch the gauge; recovery machine pulls system into vacuum

  1. Stop recovery machine when target reached

  2. Close all valves (cylinder first, then machine)

  3. Disconnect carefully (ball valves prevent loss)

  4. Tag cylinder with refrigerant type + date + your name

Recovery vs reclamation vs recycling

Recovery: removing refrigerant from system into a cylinder. Tech-level procedure.

Recycling: cleaning recovered refrigerant + reusing it in the SAME system. Some recovery machines have recycling capability built-in.

Reclamation: refining recovered refrigerant to ARI-700 purity standards + reusing. Industrial process at a reclamation facility. Required for resale.

A tech who recovers + reuses in the same system = recovery + recycling (legal). A tech who pours recovered refrigerant from one system into another customer's system = illegal (not reclaimed).

Recovery cylinder management

Tare weight: empty cylinder weight (stamped on cylinder + recorded; verify periodically).

Filled weight: tare + refrigerant.

Max gross weight: 80% of cylinder rated capacity.

Re-tare: when refilling, account for new tare each time.

Cylinder maintenance: requalified by DOT every 5 years (hydrotest). Get this done OR cylinder is invalid.

Cylinder labeling: refrigerant type, date, your name, source if mixed.

Recovered refrigerant fate

After recovery, the refrigerant can be:

  1. Reused in the same system (legal recovery + recycling)
  2. Sent to reclamation (must be ARI-700 certified before reuse in another system)
  3. Sent to destruction (for contaminated OR obsolete refrigerant; some reclamation services destroy)

Mixed / unknown refrigerant has minimal resale value + is destroyed.

Common recovery problems

Recovery machine runs but pressure doesn't drop:

  • Service valve not opening
  • Schrader core stuck (oil OR debris)
  • Hose / fitting leak
  • Cylinder shutoff valve closed

Cylinder fills slowly:

  • Cold cylinder (warm it in sun OR with cylinder heat blanket)
  • Outlet restriction on recovery machine
  • Low charge in system

Cylinder reaches 80% before system pulled down:

  • Cylinder too small for system charge
  • Switch to a second cylinder OR use larger initially

System pressure rises after recovery:

  • Trapped refrigerant in a section
  • Open additional service ports if available
  • May require time + heat to liberate trapped refrigerant

Recovery machine overheats:

  • Long pull on large system
  • Allow cooling periods
  • Match machine capacity to system

Safety during recovery

  • Eye protection + gloves always (high-pressure refrigerant can cause frostbite + eye damage)
  • Ventilation if indoor (although recovered, leaks can occur)
  • Don't smoke: refrigerants near open flame can decompose into toxic compounds (phosgene-related)
  • Hose connection check: hoses CAN come loose under high pressure; verify before pressurizing
  • Don't disconnect under pressure: depressurize hoses first

R-22 phaseout context

R-22 (HCFC) phased out of new production in 2010 + completely in 2020.

  • R-22 still in service in existing residential AC equipment
  • Recovery still required; recovered R-22 can be reused IN THE SAME SYSTEM
  • Recycled R-22 from a facility is rare + expensive
  • Replacement refrigerants: R-410A for new, OR R-407C / R-448A / R-449A as drop-ins (with system modifications)

R-410A + newer refrigerants

R-410A is current standard for new residential AC.

  • Higher operating pressures than R-22
  • DIFFERENT recovery cylinder color (rose)
  • Recovery process same; pressures different
  • Don't mix with R-22 OR other refrigerants in cylinder

References

  • EPA Section 608 (40 CFR Part 82, Subpart F)
  • AHRI 700 (refrigerant purity specification)
  • AHRI 740 (recovery + recycling equipment performance)
  • DOT 49 CFR 173 (cylinder requalification)
  • Manuall internal: Refrigerant Types Reference, HVAC Common Error Codes

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