A2L CORRECT FINALS ANSWERS AND QUESTIONS
SET A+
✔✔Refillable cylinders are typically certified for ________ of use before they must be
hydrostatically tested. - ✔✔5 years
✔✔Always ________ air from the refrigerant hoses to prevent refrigerant contamination
and excessive pressure in the recovery tank. - ✔✔Purge
✔✔Never fill a recovery tank beyond _______ of its capacity. - ✔✔80%
✔✔Never mix 2 different refrigerant types in the same ____________ - ✔✔Recovery
Tank
✔✔The term __________ is used to describe any gas that will not condense to a liquid
in the vapor-compression refrigeration cycle - ✔✔Non-condensable
✔✔Refrigeration system evacuation is a combination to two processes: - ✔✔Degassing
and Dehydration
✔✔___________ is the process of removing air and other non-condensables from the
system. - ✔✔Degassing
✔✔The removal of moisture from a system is called ____________ - ✔✔Dehydration
✔✔HVACR systems should be evacuated until a deep vacuum (typically below
___________) is reached. - ✔✔500 microns
✔✔What are some of the many factors that can affect the speed and efficiency of an
evacuation? - ✔✔1. Size of equipment being evacuated
2. Capacity of the vacuum pump and hoses being used
3. Level of moisture/contamination in the system and lines
4. Ambient Temp
, ✔✔A ________ is a very small unit of measurement, used in the HVACR industry to
measure a deep vacuum. - ✔✔Micron
✔✔When brazing a system that has been charged with a flammable refrigerant, the
system charge must be __________ first. - ✔✔Recovered
✔✔A ____________ purge should be done during the brazing process. - ✔✔Low
pressure nitrogen
✔✔After a system installation or repair, the first task that should be performed is a
_______________ - ✔✔Pressurized Leak Test
✔✔To locate small leaks, any of the following methods may be used: - ✔✔1. Ultra sonic
leak detector
2. Microfoam solution (bubbles)
3. Trace Gas and Electronic Leak Detector
✔✔When using an A2L, A2, or an A3 as a refrigerant trace gas, the amount must not
exceed ________ of the lower flammability limit (LFL) for the refrigerant as listed in
ASHRAE Standard 34. - ✔✔25%
✔✔Most, if not all, 2L refrigerants still fall under the jurisdiction of ___________. -
✔✔EPA Section 608
✔✔At the time of this writing, A2L refrigerant cylinders are allowed to be shipped
___________ - ✔✔Horizontally
✔✔DOT regulations require refrigerant cylinders containing over 2.2 lbs of a 2L
refrigerant to be equipped with a ____________ instead of a rupture disc - ✔✔Pressure
Relief Valve.
✔✔__________ requires that if flammable refrigerant cylinders are to be stored in an
enclosure, the enclosure be secure and ventilated - ✔✔OSHA.
✔✔__________ can form when any flouride-containing refrigerant, even non-flammable
A1 refrigerants, undergoes complete or incomplete combustion, or thermal
decomposition. - ✔✔Hydrogen Fluoride (HF)
✔✔___________ is a measurement of the amount of heat released when a substance,
in this case, a refrigerant, burns. - ✔✔Heat of Combustion (HOC)
SET A+
✔✔Refillable cylinders are typically certified for ________ of use before they must be
hydrostatically tested. - ✔✔5 years
✔✔Always ________ air from the refrigerant hoses to prevent refrigerant contamination
and excessive pressure in the recovery tank. - ✔✔Purge
✔✔Never fill a recovery tank beyond _______ of its capacity. - ✔✔80%
✔✔Never mix 2 different refrigerant types in the same ____________ - ✔✔Recovery
Tank
✔✔The term __________ is used to describe any gas that will not condense to a liquid
in the vapor-compression refrigeration cycle - ✔✔Non-condensable
✔✔Refrigeration system evacuation is a combination to two processes: - ✔✔Degassing
and Dehydration
✔✔___________ is the process of removing air and other non-condensables from the
system. - ✔✔Degassing
✔✔The removal of moisture from a system is called ____________ - ✔✔Dehydration
✔✔HVACR systems should be evacuated until a deep vacuum (typically below
___________) is reached. - ✔✔500 microns
✔✔What are some of the many factors that can affect the speed and efficiency of an
evacuation? - ✔✔1. Size of equipment being evacuated
2. Capacity of the vacuum pump and hoses being used
3. Level of moisture/contamination in the system and lines
4. Ambient Temp
, ✔✔A ________ is a very small unit of measurement, used in the HVACR industry to
measure a deep vacuum. - ✔✔Micron
✔✔When brazing a system that has been charged with a flammable refrigerant, the
system charge must be __________ first. - ✔✔Recovered
✔✔A ____________ purge should be done during the brazing process. - ✔✔Low
pressure nitrogen
✔✔After a system installation or repair, the first task that should be performed is a
_______________ - ✔✔Pressurized Leak Test
✔✔To locate small leaks, any of the following methods may be used: - ✔✔1. Ultra sonic
leak detector
2. Microfoam solution (bubbles)
3. Trace Gas and Electronic Leak Detector
✔✔When using an A2L, A2, or an A3 as a refrigerant trace gas, the amount must not
exceed ________ of the lower flammability limit (LFL) for the refrigerant as listed in
ASHRAE Standard 34. - ✔✔25%
✔✔Most, if not all, 2L refrigerants still fall under the jurisdiction of ___________. -
✔✔EPA Section 608
✔✔At the time of this writing, A2L refrigerant cylinders are allowed to be shipped
___________ - ✔✔Horizontally
✔✔DOT regulations require refrigerant cylinders containing over 2.2 lbs of a 2L
refrigerant to be equipped with a ____________ instead of a rupture disc - ✔✔Pressure
Relief Valve.
✔✔__________ requires that if flammable refrigerant cylinders are to be stored in an
enclosure, the enclosure be secure and ventilated - ✔✔OSHA.
✔✔__________ can form when any flouride-containing refrigerant, even non-flammable
A1 refrigerants, undergoes complete or incomplete combustion, or thermal
decomposition. - ✔✔Hydrogen Fluoride (HF)
✔✔___________ is a measurement of the amount of heat released when a substance,
in this case, a refrigerant, burns. - ✔✔Heat of Combustion (HOC)
