A2L UPDATED TEST PAPER ANSWERS AND
QUESTIONS SET A+
✔✔when a technician is disposing of a piece of equipment that was charged with a
flammable refrigerant, it must have a lavel affixed to it, which states: - ✔✔the date that
the equipment was decommissioned and the refrigerant was recovered.
✔✔where can information regarding recommended personal protective equipment
(PPE) for a specific refrigerant be found? - ✔✔the Safety Data Sheets (SDS) for the
refrigerant.
✔✔which of the following must be done when removing an existing R-410A system and
installing a system that is charged with an A2L? - ✔✔the installation area must be
evaluated to ensure that it meets the manufacturer's specifications and local buildings
codes.
✔✔before beginning the installation of a system that is charged with an A2L refrigerant:
- ✔✔Verify that all the components being installed are designed for the use with A2L
refrigerants.
✔✔when installing a system that is charged with a flammable refrigerant, which of the
following can be installed to energize mitigation responses? - ✔✔Active refrigerant
sensor.
✔✔intrisically safe electrical components: - ✔✔can be worked on while live within a
flammable atmosphere.
✔✔when performing service on the electrical components of a system that is charged
with an A2L refrigerant, which of the following is an unacceptable practice? -
✔✔discharging all capacitors with a screwdriver prior to beginning any repair.
✔✔patterns of adding refrigerant to an A2L system of at least once per three-year
period, should be concidered: - ✔✔proof of a leak
, ✔✔after reaching the required recovery level on a system that is charged with an A2L
refrigerant: - ✔✔a nitrogent sweep should be done to remove any residual refrigerant
vapor.
✔✔after installation, the refrigerant piping for an A2L system must be: - ✔✔pressurized
with dry nitrogen to perform a leak test.
✔✔if the pressure relief valve has been activated on a system that is charged with a
flammable refrigerant: - ✔✔it should be replaced with a new valve of the same rating.
✔✔upon completion of an A2L system installation. - ✔✔the manufacturer's literature
must be kept on file by the contractor performing the installation.
✔✔to reduce the possible ignition source of from being introduced into the work areas
of a flammable refrigerant system: - ✔✔designate a safe work perimeter around the
work area.
✔✔the process of transferring refrigerant from a sealed system to a refillable cylinder
approved by the Department of Transportation is called? - ✔✔recovery
✔✔if different refrigerant types are mixed in the same tank, the mixture may not be
recycled or reclaimed and may have to be.. - ✔✔destroyed at the owners expense.
✔✔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
QUESTIONS SET A+
✔✔when a technician is disposing of a piece of equipment that was charged with a
flammable refrigerant, it must have a lavel affixed to it, which states: - ✔✔the date that
the equipment was decommissioned and the refrigerant was recovered.
✔✔where can information regarding recommended personal protective equipment
(PPE) for a specific refrigerant be found? - ✔✔the Safety Data Sheets (SDS) for the
refrigerant.
✔✔which of the following must be done when removing an existing R-410A system and
installing a system that is charged with an A2L? - ✔✔the installation area must be
evaluated to ensure that it meets the manufacturer's specifications and local buildings
codes.
✔✔before beginning the installation of a system that is charged with an A2L refrigerant:
- ✔✔Verify that all the components being installed are designed for the use with A2L
refrigerants.
✔✔when installing a system that is charged with a flammable refrigerant, which of the
following can be installed to energize mitigation responses? - ✔✔Active refrigerant
sensor.
✔✔intrisically safe electrical components: - ✔✔can be worked on while live within a
flammable atmosphere.
✔✔when performing service on the electrical components of a system that is charged
with an A2L refrigerant, which of the following is an unacceptable practice? -
✔✔discharging all capacitors with a screwdriver prior to beginning any repair.
✔✔patterns of adding refrigerant to an A2L system of at least once per three-year
period, should be concidered: - ✔✔proof of a leak
, ✔✔after reaching the required recovery level on a system that is charged with an A2L
refrigerant: - ✔✔a nitrogent sweep should be done to remove any residual refrigerant
vapor.
✔✔after installation, the refrigerant piping for an A2L system must be: - ✔✔pressurized
with dry nitrogen to perform a leak test.
✔✔if the pressure relief valve has been activated on a system that is charged with a
flammable refrigerant: - ✔✔it should be replaced with a new valve of the same rating.
✔✔upon completion of an A2L system installation. - ✔✔the manufacturer's literature
must be kept on file by the contractor performing the installation.
✔✔to reduce the possible ignition source of from being introduced into the work areas
of a flammable refrigerant system: - ✔✔designate a safe work perimeter around the
work area.
✔✔the process of transferring refrigerant from a sealed system to a refillable cylinder
approved by the Department of Transportation is called? - ✔✔recovery
✔✔if different refrigerant types are mixed in the same tank, the mixture may not be
recycled or reclaimed and may have to be.. - ✔✔destroyed at the owners expense.
✔✔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
