A2L STUDY GUIDE QUESTIONS WITH ACCURATE
ANSWERS
____ ______ climate necessitates slightly lower airflow 325-350 cfms per ton of
cooling correct answer High humidity climates
A _____ refrigerant blend is a mixture of two or more refrigerant that can
separate or fractionate into its original components correct answer Zeotropic
a globally recognized, independent safety certification organization. Approves
additional refrigeration system components. correct answer Underwriters
laboratories UL
A proper ______/_____ procedure should be used when the equipment is de-
energized correct answer Lockout/tagout
A refrigerant ODP measures what? correct answer ozone depletion potential, It's
ability to destroy ozone in the stratosphere
A term used to describe the range of boiling or condensing temperatures at a
given pressure correct answer Temperature glide
After installation, the refrigerant piping for an A2 L system must be correct
answer Pressurized with dry nitrogen to perform a leak test
After reaching the required recovery level on a system that is charged with a 2L
refrigerant a _____ sweep must be done to remove any residual refrigerant vapor
correct answer Nitrogen
, All additional system components such as filter line dryers, receivers, and
accumulators must be designed, tested, and __ ____ in order to be installed on a
system that is charged with A2L refrigerant correct answer UL listed
An ______ refrigerant blend behaves like a simple compound refrigerant. It
follows a single pressure/temperature chart and does not separate into its
component parts. correct answer Azeotropic
An industry accepted mitigation strategy used when installing equipment charged
with a two hour refrigerant is correct answer Permanent space ventilation
An upper case letter designation is used when refrigerant blends are correct
answer Composed of the same refrigerant, but with different percentages of each
ASHRAE correct answer American Society of Heating, Refrigerating and Air-
Conditioning Engineers
ASHRAE Standard 15 correct answer a safety standard for refrigeration systems
that outlines safe practices for design, construction, installation, and operation
ASHRAE Standard 34 correct answer An ASHRAE standard that names refrigerants
and assigns safety classifications according to their flammability and toxicity.
Ashray standard 15 Requires that some systems that are charged with a _____
_____ require an indoor fan to be energized by an active refrigerant sensor as a
mitigation step to keep the flammable refrigerant levels below it's _____ ____
______ correct answer Flammable refrigerant, lower flammability level LFL
ANSWERS
____ ______ climate necessitates slightly lower airflow 325-350 cfms per ton of
cooling correct answer High humidity climates
A _____ refrigerant blend is a mixture of two or more refrigerant that can
separate or fractionate into its original components correct answer Zeotropic
a globally recognized, independent safety certification organization. Approves
additional refrigeration system components. correct answer Underwriters
laboratories UL
A proper ______/_____ procedure should be used when the equipment is de-
energized correct answer Lockout/tagout
A refrigerant ODP measures what? correct answer ozone depletion potential, It's
ability to destroy ozone in the stratosphere
A term used to describe the range of boiling or condensing temperatures at a
given pressure correct answer Temperature glide
After installation, the refrigerant piping for an A2 L system must be correct
answer Pressurized with dry nitrogen to perform a leak test
After reaching the required recovery level on a system that is charged with a 2L
refrigerant a _____ sweep must be done to remove any residual refrigerant vapor
correct answer Nitrogen
, All additional system components such as filter line dryers, receivers, and
accumulators must be designed, tested, and __ ____ in order to be installed on a
system that is charged with A2L refrigerant correct answer UL listed
An ______ refrigerant blend behaves like a simple compound refrigerant. It
follows a single pressure/temperature chart and does not separate into its
component parts. correct answer Azeotropic
An industry accepted mitigation strategy used when installing equipment charged
with a two hour refrigerant is correct answer Permanent space ventilation
An upper case letter designation is used when refrigerant blends are correct
answer Composed of the same refrigerant, but with different percentages of each
ASHRAE correct answer American Society of Heating, Refrigerating and Air-
Conditioning Engineers
ASHRAE Standard 15 correct answer a safety standard for refrigeration systems
that outlines safe practices for design, construction, installation, and operation
ASHRAE Standard 34 correct answer An ASHRAE standard that names refrigerants
and assigns safety classifications according to their flammability and toxicity.
Ashray standard 15 Requires that some systems that are charged with a _____
_____ require an indoor fan to be energized by an active refrigerant sensor as a
mitigation step to keep the flammable refrigerant levels below it's _____ ____
______ correct answer Flammable refrigerant, lower flammability level LFL
