Question 1 of 270705eccef9dbacbc34ba4d45f14

Which group of three refrigerants are considered low pressure refrigerants under the Clean Air act rules?

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Question 1 of 27070
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Q

Which group of three refrigerants are considered low pressure refrigerants under the Clean Air act rules?

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🔍 Key Concepts

• Clean Air Act refrigerant categories (low, medium, high pressure) • Typical evaporator pressures of common CFC and HCFC refrigerants at normal chiller temperatures • How centrifugal chillers are usually classified (very low evaporating pressures)

💭 Think About

• Look at which of these refrigerants are typically used in large low‑pressure centrifugal chillers, rather than in high‑pressure DX (direct expansion) systems. • Think about the saturation pressure of each refrigerant around typical chiller temperatures (e.g., about 40°F). Which ones have pressures below atmospheric? • Compare the groups: in each option, is there any clearly high‑pressure refrigerant mixed into the set?

✅ Before You Answer

• Verify which refrigerants are commonly listed as low‑pressure in EPA/Clean Air Act study material tables. • Check which refrigerants in the options are actually high‑pressure or medium‑pressure (they cannot belong in a low‑pressure group). • Confirm that all three refrigerants in your chosen group match the low‑pressure category; if even one is high or medium pressure, that choice is incorrect.