ESCO A2L Refrigerant Transition and Retrofit Considerations 2

Question 1

When transitioning from R-410A to R-454B, which system component most commonly requires adjustment or replacement?

Accepted Answer

The expansion device (TXV or EEV)

Answer

The thermostatic expansion valve (TXV) or electronic expansion valve (EEV) often requires adjustment or replacement because R-454B has different thermodynamic properties and pressure-enthalpy characteristics than R-410A.

Question 2

Which A2L refrigerant is a single-component (pure) refrigerant increasingly used in new residential split systems as a lower-GWP alternative to R-410A?

Accepted Answer

R-32

Answer

R-32 is a pure, single-component A2L refrigerant used globally in new residential HVAC equipment as a lower-GWP alternative to R-410A, with the benefit of no fractionation during leaks or partial recoveries.

Question 3

What is the approximate GWP of R-454B compared to R-410A's GWP of approximately 2,088?

Accepted Answer

GWP of approximately 467

Answer

R-454B has a GWP of approximately 467, representing roughly a 78% reduction compared to R-410A's GWP of about 2,088, making it a primary candidate under the AIM Act HFC phasedown schedule.

Question 4

When is it ever permissible to mix an A2L refrigerant with a remaining R-410A charge in a system?

Accepted Answer

It is never permissible to mix different refrigerant types

Answer

Mixing different refrigerant types is never permissible because it creates a contaminated mixture with unknown properties that cannot be legally reclaimed or reused, per EPA and industry standards.

Question 5

Why must technicians use recovery equipment specifically rated for flammable refrigerants when recovering A2L refrigerants?

Accepted Answer

To prevent ignition from spark-producing components inside standard recovery machines

Answer

A2L refrigerants are mildly flammable, so recovery equipment must be listed and rated for flammable refrigerants to eliminate internal ignition sources such as motor brushes and switches that could ignite refrigerant-air mixtures.

ESCO A2L - ESCO A2L Refrigerant Certification Practice Test

ESCO A2L - ESCO A2L Refrigerant Certification Practice Test

ESCO A2L Refrigerant Transition and Retrofit Considerations 2