Low GWP Refrigerant Safety: A2L
Refrigerants (Mildly Flammable)
Questions and Answers.
The process of transferring refrigerant from a sealed system to a refillable cylinder (recovery
tank) approved by the Department of Transportation (DOT) is called - Answer recovery
If different refrigerant types are mixed in the same tank, the mixture may not be able to be
recycled or reclaimed and may have to be - Answer destroyed at the owner's expense
Department of Transportation (DOT) standards require that a recovery tank should not be fill
beyond what percent of its capacity? - Answer 80%
Refillable cylinders are typically certified for how many years of use before they must be
hydrostatically tested? - Answer 5 years
For most residential and light commercial heat pump and air conditioning systems containing
less than 200 pounds of either R-22 or R-410A, the required recovery level is - Answer 0 psig
A complex process that cleans, filters, and tests a refrigerant to meet the "like-new" purity level
specified in AHRI Standard 700 is - Answer reclamation
The two most common non-condensables found in HVACR systems are - Answer air and
nitrogen
When sizing and selecting system components for equipment that is charged with a zeotropic or
near-azeotropic refrigerant blend, what method should be used? - Answer midpoint
When calculating the subcooling of a system charged with a zeotropic or near-azeotropic
refrigerant blend, what values should be used? - Answer bubble point
When calculating the superheat of a system charged with a zeotropic or near-azeotropic
refrigerant blend, which of the following values should be used? - Answer dew point
DOT rules prohibit smoking within how many feet of a cylinder containing a flammable gas? -
Answer 25 feet
When working with flammable refrigerants - Answer a fire extinguisher must be on site
Prior to beginning work on a jobsite where equipment that is charged with a flammable
refrigerant will be used - Answer the jobsite should be evaluated for safety hazards such as
possible ignition sources or the presence of flammable vapors.
What is an example of a zeotropic refrigerant blend? - Answer R-452B
The stage of the evacuation process which removes moisture from a system through
evaporation is called - Answer dehydration
What is classified as an A2L refrigerant? - Answer R-32
Small amounts of moisture can react with the refrigerant and oil in the system causing the
formation of - Answer Acid
What is an example refrigerant that is exempt from the EPA's recovery mandate? - Answer R-
744 (carbon dioxide)
A refrigerant oil that is hygroscopic will - Answer absorb moisture
What is an example of an A3 refrigerant? - Answer R-600a (isobutane)
Refrigerants (Mildly Flammable)
Questions and Answers.
The process of transferring refrigerant from a sealed system to a refillable cylinder (recovery
tank) approved by the Department of Transportation (DOT) is called - Answer recovery
If different refrigerant types are mixed in the same tank, the mixture may not be able to be
recycled or reclaimed and may have to be - Answer destroyed at the owner's expense
Department of Transportation (DOT) standards require that a recovery tank should not be fill
beyond what percent of its capacity? - Answer 80%
Refillable cylinders are typically certified for how many years of use before they must be
hydrostatically tested? - Answer 5 years
For most residential and light commercial heat pump and air conditioning systems containing
less than 200 pounds of either R-22 or R-410A, the required recovery level is - Answer 0 psig
A complex process that cleans, filters, and tests a refrigerant to meet the "like-new" purity level
specified in AHRI Standard 700 is - Answer reclamation
The two most common non-condensables found in HVACR systems are - Answer air and
nitrogen
When sizing and selecting system components for equipment that is charged with a zeotropic or
near-azeotropic refrigerant blend, what method should be used? - Answer midpoint
When calculating the subcooling of a system charged with a zeotropic or near-azeotropic
refrigerant blend, what values should be used? - Answer bubble point
When calculating the superheat of a system charged with a zeotropic or near-azeotropic
refrigerant blend, which of the following values should be used? - Answer dew point
DOT rules prohibit smoking within how many feet of a cylinder containing a flammable gas? -
Answer 25 feet
When working with flammable refrigerants - Answer a fire extinguisher must be on site
Prior to beginning work on a jobsite where equipment that is charged with a flammable
refrigerant will be used - Answer the jobsite should be evaluated for safety hazards such as
possible ignition sources or the presence of flammable vapors.
What is an example of a zeotropic refrigerant blend? - Answer R-452B
The stage of the evacuation process which removes moisture from a system through
evaporation is called - Answer dehydration
What is classified as an A2L refrigerant? - Answer R-32
Small amounts of moisture can react with the refrigerant and oil in the system causing the
formation of - Answer Acid
What is an example refrigerant that is exempt from the EPA's recovery mandate? - Answer R-
744 (carbon dioxide)
A refrigerant oil that is hygroscopic will - Answer absorb moisture
What is an example of an A3 refrigerant? - Answer R-600a (isobutane)
