Core: Section 608 Fundamentals, Venting Prohibition, and Refrigerant Handling
Core: Section 608 fundamentals
The Core domain tests the rules that apply to every refrigerant job under EPA Section 608: the venting prohibition, certification, refrigerant classes, recovery/recycling/reclamation, and safe cylinder handling. Expect definition and compliance questions rather than equipment-specific procedures.
Clean Air Act framework
Section 608 of the Clean Air Act governs stationary refrigeration and air-conditioning equipment. It makes it illegal to knowingly vent ozone-depleting refrigerants and their substitutes during maintenance, service, repair, or disposal. Technicians who service, maintain, repair, or dispose of covered appliances must be certified. Motor vehicle air conditioners are covered separately under Section 609.
Refrigerant classes and ODP
CFCs such as R-11 and R-12 have the highest ozone-depletion potential. HCFCs such as R-22 and R-123 have lower ODP but are still ozone-depleting. HFCs such as R-134a and R-410A have zero ODP, but they are regulated substitutes and are not a license to vent. HFOs are lower-GWP alternatives. Always recover refrigerant before opening a system.
Handling rules
Use recovery equipment certified for the refrigerant and appliance type. Never fill a recovery cylinder above 80% of its capacity. Do not mix refrigerant types in one cylinder. Evacuate and leak-check before charging; use dry nitrogen, never oxygen or compressed air, for pressure testing. Label recovered refrigerant and keep records.
Worked example
A technician opens a sealed refrigerator containing 3 lb of R-12. Because the charge is at or below 5 lb, it is a small appliance. The technician must recover the refrigerant before opening the circuit. With the compressor running, recover at least 90% of the charge; with it off, at least 80%. An accepted alternative target is 4 in Hg vacuum. Venting the remainder is illegal. The reasoning: Section 608's venting ban applies, and the small-appliance recovery target depends on compressor operation.
Traps
Do not assume a small release is legal. Do not treat HFCs as unregulated for venting purposes. Do not skip certification because the appliance is small. Do not use oxygen or air to pressure-test. Do not overfill a recovery cylinder or mix refrigerants.