Refrigerants

Refrigerant fundamentals — pressure-temperature, glide, oils (POE vs. mineral), recovery, reclaim, A2L safety and EPA 608 rules.

6 guides

• A2L Refrigerants (R-454B / R-32) — Safety and Handling
  What the A2L safety class means, how mildly-flammable refrigerants like R-454B and R-32 differ from R-410A in handling, and the practical safety practices for working on A2L equipment.
• EPA 608 Certification: Types, What's Tested, and How to Pass
  The EPA 608 technician certification from a test-taking angle — the four certification types and what equipment each covers, how the exam is structured (Core plus the type sections), a realistic study approach, and why the cert is legally required to buy and handle refrigerant.
• POE vs Mineral Oil — Refrigerant Oils Explained
  Why the oil in a refrigeration system matters, the difference between mineral oil and POE (polyolester), which refrigerants use which, and why POE's moisture-grabbing nature changes how you service the system.
• R-410A vs R-22 — Operating Differences a Tech Needs to Know
  The practical differences between R-410A and R-22 — operating pressures, oil type, equipment ratings, and why you can't just swap one for the other — for techs working both in the field.
• Refrigerant Glide and Why You Charge Blends as Liquid
  What temperature glide is, the difference between zeotropic and azeotropic refrigerants, why you must charge blends as liquid to avoid fractionation, and how to handle bubble/dew points for superheat and subcooling.
• Refrigerant Recovery and EPA 608 Basics
  The practical EPA 608 rules a service tech lives by — no venting, certification requirements, recovery vs recycle vs reclaim, and how to recover cleanly into a proper cylinder.

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