A2L EXAMS SCRIPT ANSWERS AND QUESTIONS SET
A+
✔✔___________ is a measurement of the amount of heat released when a substance,
in this case, a refrigerant, burns. - ✔✔Heat of Combustion (HOC)
✔✔________ of a combustible gas is the rate at which a flame front spreads relative to
the unburned gas ahead of the flame. - ✔✔Burning velocity
✔✔____________ are used to determine the maximum concentration of a refrigerant
allowed in an occupied space - ✔✔Refrigerant Concentration Limits (RCL).
✔✔The maximum charge size for the A2L equipment being installed will be limited by
the ________ of airspace served by the equipment. - ✔✔Cubic Feet
✔✔Upon completion of system installation, the ____________ must be left with the
equipment owner. - ✔✔Manufacturers Literature (service manual)
✔✔After a pressure relief valve has been ___________, it should be replaced with a
new one with the same ratings. - ✔✔Actuated
✔✔Name some mitigation strategies - ✔✔1. Active refrigerant alarms
2. Permanent space ventilation
3. Constant airflow
4. Systems with an automatic refrigerant pumpdown
✔✔When brazing copper refrigerant tubing, a ___________ purge is required to prevent
oxidation and scale formation - ✔✔Low pressure nitrogen.
✔✔The accepted industry standard for a quality deep vacuum is _______ microns. -
✔✔500
, ✔✔What equipment is described as "equipment and wiring which is incapable of
releasing sufficient electrical or thermal energy under normal or abnormal conditions to
cause ignition of a specific hazardous atmospheric mixture in its most easily ignited
concentration" - ✔✔Intrinsically Safe (IS)
✔✔When performing repairs on a system that is charged with an A2L refrigerant, start
by ensuring that the unit is ___________ - ✔✔Properly Grounded
✔✔Section 612 of the _____________ requires EPA to evaluate substitutes for ozone-
depleting substances to reduce overall risk to human health and the environment. -
✔✔Clean Air Act (CAA)
✔✔_________ is equal to 760,000 microns. - ✔✔Atmospheric Pressure (0 psig)
✔✔ Cylinders should be stored at temps under _________ - ✔✔125 F
✔✔Refillable cylinders (recovery tanks) should not be filled beyond _____ of their
maximum capacity - ✔✔80%
✔✔A2L refrigerant cylinders are allowed to be shipped ________, fitting into standard
storage racks. - ✔✔Horizontally
✔✔When transporting refrigerant cylinders, industry best practice is to ensure that the
relief valve is at the ________ - ✔✔12 o'clock postion
✔✔When transporting flammable refrigerants, DOT requires that the vehicle be
equipped with which type of fire extinguisher? - ✔✔Class B Dry Powder
✔✔DOT prohibits smoking within ________ of flammable gases. - ✔✔25 feet
✔✔When transporting flammable refrigerants, carrying the ________ for each
refrigerant is also recommended. - ✔✔Safety Data Sheets (SDS)
✔✔When working with flammable refrigerants, only __________ should be used. -
✔✔Spark Free Tools
✔✔Equipment with flammable refrigerant requires a red colored marking on all process
tubes and service connections. The color marking must extend _______ in both
directions from service locations. - ✔✔One inch
✔✔Flammable refrigerant tanks are marked with a ________, and a DOT flammable
gas placard or decal. - ✔✔Red Stripe
A+
✔✔___________ is a measurement of the amount of heat released when a substance,
in this case, a refrigerant, burns. - ✔✔Heat of Combustion (HOC)
✔✔________ of a combustible gas is the rate at which a flame front spreads relative to
the unburned gas ahead of the flame. - ✔✔Burning velocity
✔✔____________ are used to determine the maximum concentration of a refrigerant
allowed in an occupied space - ✔✔Refrigerant Concentration Limits (RCL).
✔✔The maximum charge size for the A2L equipment being installed will be limited by
the ________ of airspace served by the equipment. - ✔✔Cubic Feet
✔✔Upon completion of system installation, the ____________ must be left with the
equipment owner. - ✔✔Manufacturers Literature (service manual)
✔✔After a pressure relief valve has been ___________, it should be replaced with a
new one with the same ratings. - ✔✔Actuated
✔✔Name some mitigation strategies - ✔✔1. Active refrigerant alarms
2. Permanent space ventilation
3. Constant airflow
4. Systems with an automatic refrigerant pumpdown
✔✔When brazing copper refrigerant tubing, a ___________ purge is required to prevent
oxidation and scale formation - ✔✔Low pressure nitrogen.
✔✔The accepted industry standard for a quality deep vacuum is _______ microns. -
✔✔500
, ✔✔What equipment is described as "equipment and wiring which is incapable of
releasing sufficient electrical or thermal energy under normal or abnormal conditions to
cause ignition of a specific hazardous atmospheric mixture in its most easily ignited
concentration" - ✔✔Intrinsically Safe (IS)
✔✔When performing repairs on a system that is charged with an A2L refrigerant, start
by ensuring that the unit is ___________ - ✔✔Properly Grounded
✔✔Section 612 of the _____________ requires EPA to evaluate substitutes for ozone-
depleting substances to reduce overall risk to human health and the environment. -
✔✔Clean Air Act (CAA)
✔✔_________ is equal to 760,000 microns. - ✔✔Atmospheric Pressure (0 psig)
✔✔ Cylinders should be stored at temps under _________ - ✔✔125 F
✔✔Refillable cylinders (recovery tanks) should not be filled beyond _____ of their
maximum capacity - ✔✔80%
✔✔A2L refrigerant cylinders are allowed to be shipped ________, fitting into standard
storage racks. - ✔✔Horizontally
✔✔When transporting refrigerant cylinders, industry best practice is to ensure that the
relief valve is at the ________ - ✔✔12 o'clock postion
✔✔When transporting flammable refrigerants, DOT requires that the vehicle be
equipped with which type of fire extinguisher? - ✔✔Class B Dry Powder
✔✔DOT prohibits smoking within ________ of flammable gases. - ✔✔25 feet
✔✔When transporting flammable refrigerants, carrying the ________ for each
refrigerant is also recommended. - ✔✔Safety Data Sheets (SDS)
✔✔When working with flammable refrigerants, only __________ should be used. -
✔✔Spark Free Tools
✔✔Equipment with flammable refrigerant requires a red colored marking on all process
tubes and service connections. The color marking must extend _______ in both
directions from service locations. - ✔✔One inch
✔✔Flammable refrigerant tanks are marked with a ________, and a DOT flammable
gas placard or decal. - ✔✔Red Stripe
