ESCO A2L - ESCO A2L Refrigerant Flammability Classifications and Risk Assessment Questions and Answers Flashcards

What ASHRAE Standard 34 safety group classification applies to A2L refrigerants?

Answer: A2L

A2L refrigerants are classified under ASHRAE 34 safety group A2L, indicating lower toxicity and lower flammability with a burning velocity at or below 10 cm/s.

What is the maximum burning velocity that qualifies a refrigerant for the A2L classification under ASHRAE 34?

Answer: 10 cm/s

ASHRAE 34 defines A2L refrigerants as having a maximum burning velocity of 10 cm/s, distinguishing them from higher-flammability A2 and A3 refrigerants.

Which A2L refrigerant is designated as the primary low-GWP replacement for R-410A in new US residential HVAC equipment?

Answer: R-454B

R-454B (marketed as Opteon XL41) is the primary A2L refrigerant designated to replace R-410A in new residential HVAC systems due to its significantly lower GWP of approximately 466.

In the ASHRAE 34 safety classification system, what does the letter 'A' prefix indicate?

Answer: Lower toxicity

In ASHRAE 34 classifications, the letter 'A' indicates lower toxicity, meaning the refrigerant's TLV-TWA is greater than 400 ppm, while 'B' indicates higher toxicity.

Compared to A3 refrigerants like propane (R-290), A2L refrigerants require what type of energy to ignite?

Answer: Higher minimum ignition energy

A2L refrigerants have a higher minimum ignition energy (MIE) than A3 refrigerants, meaning they are harder to ignite and require more energy from an ignition source to combust.

Which A2L refrigerant is widely used in mini-split systems globally and is increasingly found in US residential ductless equipment?

Answer: R-32

R-32 is a single-component A2L refrigerant widely used in mini-split systems, particularly in Asia and increasingly in US residential ductless HVAC equipment.