A2L MAIN SET ANSWERS AND QUESTIONS SET A+
✔✔DOT standards require that a recovery tank should not be filled beyond what
percentage of its capacity? - ✔✔80%
✔✔refillable cylinders are typically certified for how many years of use before they must
be hydrostatically tested? - ✔✔5 years
✔✔for most residential and light commercial heat pump and AC systems containing less
than 200 pounds of either R-22 or R-410A, the required recovery level is? - ✔✔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? - ✔✔reclamation
✔✔the two most common non-condesables found in HVACR systems are? - ✔✔Air and
Nitrogen
✔✔when sizing and selecting system components for equipment that is charged with a
zeotropic or near-azeotropic refrigerant blend, which of the following methods should be
used? - ✔✔midpoint
✔✔when calculating the subcooling of a system with a zeotropic or near-azeotropic
refrigerant blend, which of the following values should be used? - ✔✔bubble point
✔✔when calculating the superheat of a system charged with - ✔✔dew point
✔✔DOT rules prohibit smoking within how many feet of a cylinder containing a
flammable gas? - ✔✔25 feet
✔✔when working with flammable refrigerants.. - ✔✔a fire extinguisher should be onsite
(type b)
✔✔DOT standards require that a recovery tank should not be filled beyond what
percentage of its capacity? - ✔✔80%
✔✔refillable cylinders are typically certified for how many years of use before they must
be hydrostatically tested? - ✔✔5 years
✔✔for most residential and light commercial heat pump and AC systems containing less
than 200 pounds of either R-22 or R-410A, the required recovery level is? - ✔✔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? - ✔✔reclamation
✔✔the two most common non-condesables found in HVACR systems are? - ✔✔Air and
Nitrogen
✔✔when sizing and selecting system components for equipment that is charged with a
zeotropic or near-azeotropic refrigerant blend, which of the following methods should be
used? - ✔✔midpoint
✔✔when calculating the subcooling of a system with a zeotropic or near-azeotropic
refrigerant blend, which of the following values should be used? - ✔✔bubble point
✔✔when calculating the superheat of a system charged with - ✔✔dew point
✔✔DOT rules prohibit smoking within how many feet of a cylinder containing a
flammable gas? - ✔✔25 feet
✔✔when working with flammable refrigerants.. - ✔✔a fire extinguisher should be onsite
(type b)
