A2L Properties and Classification 2

Question 1

Which ASHRAE Standard provides the primary classification system for refrigerant safety groups including the A2L category?

Accepted Answer

ASHRAE Standard 34

Answer

ASHRAE Standard 15

Answer

ASHRAE Standard 62.1

Answer

ASHRAE Standard 90.1

Question 2

What refrigerant does R-454B replace, and what is its primary application?

Accepted Answer

R-410A — residential and light commercial split-system air conditioners

Answer

R-22 — retrofitting older commercial refrigeration systems

Answer

R-134a — mobile air conditioning in passenger vehicles

Answer

R-404A — commercial supermarket refrigeration display cases

Question 3

What is the chemical name and molecular formula of R-32, a key A2L refrigerant?

Accepted Answer

Difluoromethane (CH₂F₂)

Answer

Tetrafluoroethane (C₂H₂F₄)

Answer

Chlorodifluoromethane (CHClF₂)

Answer

Pentafluoroethane (C₂HF₅)

Question 4

Under the EPA Section 608 regulations, which technicians are required to recover A2L refrigerants before disposing of or servicing equipment?

Accepted Answer

Any certified EPA Section 608 technician (Type I, II, III, or Universal)

Answer

Only Universal certified technicians for A2L work

Answer

A2L refrigerants are exempt from recovery requirements due to their low GWP

Answer

Only technicians with additional A2L-specific EPA certification

Question 5

What is the normal boiling point of R-32 and how does it compare to R-410A?

Accepted Answer

-51.7°C for R-32 vs -51.4°C for R-410A — nearly identical boiling points

Answer

-10°C for R-32 vs -51.4°C for R-410A — R-32 is much warmer boiling

Answer

-78°C for R-32 vs -51.4°C for R-410A — R-32 boils much colder

Answer

+5°C for R-32 vs -51.4°C for R-410A — R-32 is a high-pressure liquid

Question 6

R-452B is another A2L refrigerant used as an R-410A replacement. What refrigerants does it contain?

Accepted Answer

R-32, R-125, and R-1234yf in a ternary blend

Answer

R-32 and R-134a in a binary blend

Answer

Pure R-1234ze(E) as a single-component refrigerant

Answer

R-1234yf and R-134a in a binary blend