Which of the following refrigerants is an...

Question 1 / 270705eccef9dbacbc34ba4d45f12

Question 1 of 270705eccef9dbacbc34ba4d45f12

Which of the following refrigerants is an interim retrofit replacement for R-11?

Question 1 of 27070

Which of the following refrigerants is an interim retrofit replacement for R-11?

🔍 Key Concepts

• CFCs vs HCFCs vs HFCs and where R-11 fits in those groups • The idea of an interim retrofit (drop-in or near drop‑in) for existing R-11 centrifugal chillers • Which refrigerants are mainly used for new designs versus retrofit replacements for older low‑pressure systems

💭 Think About

• First, identify what type of refrigerant R-11 is (low-pressure, older CFC used in large chillers) and why it needed a phaseout • Then, think about which listed option was specifically marketed as a low‑pressure replacement for R‑11 in existing equipment, not just any general-purpose refrigerant • Eliminate options that are high‑pressure refrigerants or primarily used in small systems like domestic refrigerators or automotive A/C

✅ Before You Answer

• Verify which option is a low-pressure refrigerant designed for large centrifugal chillers similar to R‑11 applications • Check which option is classified as an HCFC that was used as a transitional or interim replacement during the CFC phaseout • Make sure the choice you pick was actually approved and commonly used as a retrofit for R‑11, not just an environmentally friendlier refrigerant in general

Question 1 of 27070

Which of the following refrigerants is an interim retrofit replacement for R-11?

R-500

R-134a

R-12

R-123

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