EPA 609 cheat sheet

Recovery machine categories under SAE J2810/J2788: AC (small systems), J2810 for R-134a, J2788 for R-1234yf; non-automotive machines may not be used on MVAC systems.

Recovery cylinder fill limit: never exceed 80% of cylinder capacity; a scale or float switch must stop transfer at that point.

Recovery cylinder DOT classification: refillable cylinders must be DOT-approved and requalified; single-use disposable cylinders must not be refilled.

Vacuum pump target: evacuate to and hold at least 29.9 inHg (about 500 microns) for the time specified by the OEM, typically 15-45 minutes; a decay test confirms no leak.

Manifold gauge set: blue = low side, red = high side, yellow = service/center; purge air from hoses before opening refrigerant flow.

Charging accuracy: charge by weight using a scale to the OEM-specified charge; pressure-only charging is unreliable because pressure varies with ambient temperature.

Leak detection: use electronic detectors, UV dye, or soap solution; never use open flame or halide torch on R-1234yf systems because of flammability.

R-1234yf is A2L mildly flammable: no open flame, no spark sources, and dedicated equipment/lines separate from R-134a to avoid cross-contamination.

Service hoses and fittings: SAE J2196/J3062 couplers; R-1234yf uses a different coupler than R-134a, so systems cannot be accidentally cross-connected.

Section 609 certification is required for any technician who services or repairs MVAC systems; it is obtained by passing an EPA-approved test and must be kept on file by the employer.

Section 608 applies to stationary refrigeration and A/C, not MVAC; MVAC technicians certify under 609, and knowingly venting refrigerant is prohibited for both programs.

Refrigerant sales restriction: MVAC refrigerant may be sold only to certified technicians, or to a person who certifies intent to resell or to use it for a non-MVAC purpose.

Recovery equipment must be certified to SAE standards and used per the equipment manufacturer's instructions; the technician must be able to show certification records.

Small cans of R-134a (2 lb or less) require self-sealing valves and must carry the required warning label under EPA rules.

Leak repair is not federally mandated for MVAC the way it is for stationary equipment, but venting refrigerant to the atmosphere is illegal, and the technician must recover it.

Recordkeeping: employers must retain proof of technician 609 certification; service records for refrigerant purchase and use are required under the sales restriction and must be made available to EPA on request.

Refrigerant substitutes: a refrigerant must be EPA-acceptable under the Significant New Alternatives Policy (SNAP) before it can be used; unapproved flammable substitutes are illegal in MVAC.

Ozone-depleting refrigerants such as R-12 are subject to a phase-out and cannot be manufactured or imported for new MVAC use in the U.S.; recovered R-12 may be recycled and reused.

Recovery is mandatory before opening any MVAC system, because refrigerant released to the atmosphere is illegal venting under Section 609.

Recovery efficiency: certified equipment must recover at least 90-95% of the refrigerant depending on the standard and whether the system is operating; the exact target comes from the SAE standard the machine is certified to.

Recycling vs. recovery: recovery removes refrigerant from the system; recycling cleans it for reuse in the same or another MVAC system; reclamation restores it to purity spec (AHRI 700) for resale.

Recovered refrigerant may be recycled on-site and reused; it may not be sold or transferred unless it is reclaimed to AHRI 700 by an EPA-certified reclaimer.

Recovery protects the technician: liquid refrigerant contacting skin causes frostbite, and refrigerant vapor displaces oxygen in enclosed spaces.

Recovery reduces cost: recovered R-1234yf and R-134a can be reused, avoiding purchase of new refrigerant and disposal fees.

Cross-contamination: mixing R-134a and R-1234yf makes the mixture unreclaimable and may damage equipment; recover each refrigerant into separate, properly labeled cylinders.

Never vent refrigerant to clear a line or to speed a repair; use recovery equipment even for small residual charges, since small releases add up across the industry.

ODP (ozone depletion potential): R-12 has ODP 1.0 (the reference), R-22 about 0.055, and R-134a and R-1234yf have ODP 0 because they contain no chlorine or bromine.

GWP (global warming potential, 100-yr): R-134a about 1,430; R-1234yf about 4; R-12 about 10,900; CO2 = 1. These values drive the shift to low-GWP refrigerants.

Chlorine from CFCs such as R-12 catalyzes ozone destruction: one chlorine atom can destroy many thousands of ozone molecules before leaving the stratosphere.

Ozone layer function: stratospheric ozone absorbs UV-B; depletion raises skin cancer, cataract, and immune-suppression risk and harms crops and marine plankton.

Climate impact: each kilogram of R-134a released is equivalent to roughly 1.4 tonnes of CO2; refrigerant leaks are a major share of an MVAC system's lifetime climate impact.

R-1234yf is an HFO with very low GWP but is mildly flammable (A2L), so handling requires attention to ignition sources and ventilation.

Indirect effect: an inefficient system or improper charge raises fuel use and CO2 emissions, so correct charging and leak repair reduce climate impact beyond the refrigerant itself.

Illegal venting harms both problems: CFCs damage ozone and warm the climate; HFCs such as R-134a warm the climate strongly even though they do not deplete ozone.