A2L Refrigerant Safety Practice Exam 50 Questions

A2L REFRIGERANT

SAFETY PRACTICE EXAM

50 QUESTIONS

Question 1: Under ASHRAE Standard 34 safety classi�cation, what does the letter A in A2L indicate?

Choices:

1) Lower toxicity 2) Higher toxicity 3) Non�ammable 4) High pressure

Correct Answer: Lower toxicity

Explanation: The letter A identi�es the lower-toxicity class. The 2L portion describes lower �ammability with a low burning velocity.Page 1

Question 2: What characteristic most directly distinguishes an A2L refrigerant from an A1 refrigerant?

Choices:

1) It is always a hydrocarbon 2) It has lower �ammability rather than no �ame propagation 3) It has higher toxicity 4) It cannot be recovered Correct Answer: It has lower �ammability rather than no �ame propagation Explanation: A1 refrigerants have no �ame propagation under the classi�cation test, while A2L refrigerants are mildly �ammable and require ignition-control precautions.

Question 3: Which refrigerant is commonly classi�ed as A2L?

Choices:

1) R-32

2) R-744

3) R-717

4) R-290

Correct Answer: R-32

Explanation: R-32 is an A2L refrigerant. R-744 is carbon dioxide, R-717 is ammonia, and R-290 is propane with di�erent safety classi�cations.Page 2

Question 4: Why is ventilation important when working with an A2L refrigerant in an enclosed area?

Choices:

1) It raises system pressure for leak testing 2) It prevents refrigerant fractionation 3) It reduces the chance of a �ammable concentration and oxygen displacement 4) It eliminates the need for leak detection Correct Answer: It reduces the chance of a �ammable concentration and oxygen displacement Explanation: Ventilation helps prevent refrigerant from accumulating to a potentially �ammable concentration and also reduces the asphyxiation hazard from oxygen displacement.

Question 5: What is the safest assumption about the location of leaked A2L

refrigerant in a poorly ventilated room?

Choices:

1) It will always rise to the ceiling 2) It may collect in low areas because many refrigerants are heavier than air 3) It instantly becomes harmless 4) It remains only inside the equipment cabinet Correct Answer: It may collect in low areas because many refrigerants are heavier than air Explanation: Many HVAC refrigerants are heavier than air and can accumulate near �oors, pits, and other low points, so ventilation and leak checks must account for those areas.Page 3