RTUS A2L CORE 2 QUESTIONS WITH ACCURATE
ANSWERS
____ contain hydrogen, fluorine, and carbon and do not deplete the ozone as
they have no chlorine, and most have a high GWP correct answer HFCs
____ refrigerants contain hydrogen and carbon and are classified by ASHRAE in
the A3 safety group, which are highly flammable, and are often referred to as
natural refrigerants correct answer HCs
____ refrigerants have a very low, single digit, GWP and most are mildly
flammable (A2L) correct answer HFOs
A ____ should always be used to measure the vacuum level correct answer
Micron Gauge
A refrigerant that is in a mixed state (liquid and vapor) is said to be? correct
answer Saturated
A term used to describe the range of boiling (or condensing) temperatures for a
refrigerant at a given pressure correct answer Temperature Glide
Adding _____ heat to a substance will cause it to change state correct answer
Latent
AHRI Guideline N, Assignment of Refrigerant Container Colors, specifies that all
refrigerants should have one uniform paint color _____ correct answer Light
Green/Grey
, All refrigerant oils are ____ meaning that they absorb moisture correct answer
Hygroscopic
ASHRAE Standard ____ is used to classify a refrigerant according to the potential
hazards involved with its use, specifically toxicity and flammability correct answer
34
Certain refrigerants, such as ____ and ____ are exempt from the EPA's recovery
mandate correct answer R290 (Propane) and R600a (Isobutane)
Flammability, which indicates a refrigerant's ability to burn, is represented in
ASHRAE standards with a ____ designation correct answer Number
Flammable refrigerants must continue to include a _____ on the top of the
container correct answer Red Band
High side saturation temperature - Liquid line temperature correct answer
Subcool
In air conditioning applications the industry standard for airflow across the
evaporator is ____ per ton of cooling correct answer 400 CFM (Cubic Feet Per
Minute)
Liquid charging is done with the cylinder in the correct answer Inverted position
Never fill a recovery tank beyond ____ of its capacity correct answer 80%
ANSWERS
____ contain hydrogen, fluorine, and carbon and do not deplete the ozone as
they have no chlorine, and most have a high GWP correct answer HFCs
____ refrigerants contain hydrogen and carbon and are classified by ASHRAE in
the A3 safety group, which are highly flammable, and are often referred to as
natural refrigerants correct answer HCs
____ refrigerants have a very low, single digit, GWP and most are mildly
flammable (A2L) correct answer HFOs
A ____ should always be used to measure the vacuum level correct answer
Micron Gauge
A refrigerant that is in a mixed state (liquid and vapor) is said to be? correct
answer Saturated
A term used to describe the range of boiling (or condensing) temperatures for a
refrigerant at a given pressure correct answer Temperature Glide
Adding _____ heat to a substance will cause it to change state correct answer
Latent
AHRI Guideline N, Assignment of Refrigerant Container Colors, specifies that all
refrigerants should have one uniform paint color _____ correct answer Light
Green/Grey
, All refrigerant oils are ____ meaning that they absorb moisture correct answer
Hygroscopic
ASHRAE Standard ____ is used to classify a refrigerant according to the potential
hazards involved with its use, specifically toxicity and flammability correct answer
34
Certain refrigerants, such as ____ and ____ are exempt from the EPA's recovery
mandate correct answer R290 (Propane) and R600a (Isobutane)
Flammability, which indicates a refrigerant's ability to burn, is represented in
ASHRAE standards with a ____ designation correct answer Number
Flammable refrigerants must continue to include a _____ on the top of the
container correct answer Red Band
High side saturation temperature - Liquid line temperature correct answer
Subcool
In air conditioning applications the industry standard for airflow across the
evaporator is ____ per ton of cooling correct answer 400 CFM (Cubic Feet Per
Minute)
Liquid charging is done with the cylinder in the correct answer Inverted position
Never fill a recovery tank beyond ____ of its capacity correct answer 80%
