A2L EVALUATION TEST ANSWERS AND QUESTIONS
SET A+
✔✔Currently, the charge limit for systems containing an A3 refrigerant is ___________ -
✔✔150 grams or 5.3 oz
✔✔When installing or servicing a system that is charged with a flammable refrigerant,
always keep a Class ___________ fire extinguisher on the jobsite. - ✔✔B (dry powder)
✔✔The maximum charge size for the A2L equipment being installed will be limited by
the ___________ served by the equipment - ✔✔cubic feet of airspace
✔✔___________ are designed and installed to prevent accumulation and/or ignition of
flammable refrigerant vapors should a leak occur. - ✔✔mitigation strategies
✔✔___________ can activate mechanical ventilation systems, activate a solenoid to
force the system into a pump down, de-energize the system completely, or a
combination of mitigation responses using control logic electronics. - ✔✔active
refrigerant sensors
✔✔refrigerant piping that is installed inside of a wall or floorspace, where it passes
through joists or studs, must be protected by ___________ - ✔✔strike plates
✔✔After installation, the refrigerant piping must ___________ - ✔✔be pressurized to
perform a leak test
✔✔R-410A has an RCL of ___________ PPM - ✔✔140,000
✔✔R-454B has an RCL of ___________ PPM - ✔✔19,000
✔✔R-1234yf has an RCL of ___________ PPM - ✔✔16,000
✔✔R-32 has an LFL of ___________ % - ✔✔14.4
, ✔✔R-600a has an LFL of ___________ % - ✔✔1.8
✔✔R-1234yf has an MIE of ___________ mJ - ✔✔5,000-10,000 mJ
✔✔R-32 has an MIE of ___________ mJ - ✔✔30-100
✔✔R-1234yf has an HOC of ___________ Btu/lb - ✔✔4,408
✔✔R-290 has an HOC of ___________ Btu/lb - ✔✔19,905
✔✔A2L systems are designed with electrical components that are ___________ -
✔✔intrinsically safe
✔✔When performing repairs on a system that is charged with an A2L refrigerant,
discharge capacitors with ___________ - ✔✔a resistor
✔✔When performing repairs on a system that is charged with an A2L refrigerant,
replace components only with parts ___________ - ✔✔specified by the manufacturer
(OEM)
✔✔technicians should refer to the ___________ for target refrigerant recovery levels. -
✔✔EPA recovery efficiency chart
✔✔After recovery of an A2L refrigerant, the system should be ___________ -
✔✔purged with dry nitrogen
✔✔When evacuating an A2L system, the vacuum pump must be___________ -
✔✔rated for use with A2L refrigerants
✔✔For evacuation, some manufacturers of A2L equipment require that the system be
___________ - ✔✔triple evacuated
✔✔When charging an A2L system where ventilation mitigation has been installed, the
maximum allowable charge cannot exceed the ___________ charge weight. - ✔✔M2
✔✔When charging an A2L system where ventilation mitigation has not been installed,
the maximum allowable charge cannot exceed the ___________ charge weight. -
✔✔M1
✔✔___________ should be used to prevent unauthorized access to the refrigerant
circuit. - ✔✔locking refrigerant caps
SET A+
✔✔Currently, the charge limit for systems containing an A3 refrigerant is ___________ -
✔✔150 grams or 5.3 oz
✔✔When installing or servicing a system that is charged with a flammable refrigerant,
always keep a Class ___________ fire extinguisher on the jobsite. - ✔✔B (dry powder)
✔✔The maximum charge size for the A2L equipment being installed will be limited by
the ___________ served by the equipment - ✔✔cubic feet of airspace
✔✔___________ are designed and installed to prevent accumulation and/or ignition of
flammable refrigerant vapors should a leak occur. - ✔✔mitigation strategies
✔✔___________ can activate mechanical ventilation systems, activate a solenoid to
force the system into a pump down, de-energize the system completely, or a
combination of mitigation responses using control logic electronics. - ✔✔active
refrigerant sensors
✔✔refrigerant piping that is installed inside of a wall or floorspace, where it passes
through joists or studs, must be protected by ___________ - ✔✔strike plates
✔✔After installation, the refrigerant piping must ___________ - ✔✔be pressurized to
perform a leak test
✔✔R-410A has an RCL of ___________ PPM - ✔✔140,000
✔✔R-454B has an RCL of ___________ PPM - ✔✔19,000
✔✔R-1234yf has an RCL of ___________ PPM - ✔✔16,000
✔✔R-32 has an LFL of ___________ % - ✔✔14.4
, ✔✔R-600a has an LFL of ___________ % - ✔✔1.8
✔✔R-1234yf has an MIE of ___________ mJ - ✔✔5,000-10,000 mJ
✔✔R-32 has an MIE of ___________ mJ - ✔✔30-100
✔✔R-1234yf has an HOC of ___________ Btu/lb - ✔✔4,408
✔✔R-290 has an HOC of ___________ Btu/lb - ✔✔19,905
✔✔A2L systems are designed with electrical components that are ___________ -
✔✔intrinsically safe
✔✔When performing repairs on a system that is charged with an A2L refrigerant,
discharge capacitors with ___________ - ✔✔a resistor
✔✔When performing repairs on a system that is charged with an A2L refrigerant,
replace components only with parts ___________ - ✔✔specified by the manufacturer
(OEM)
✔✔technicians should refer to the ___________ for target refrigerant recovery levels. -
✔✔EPA recovery efficiency chart
✔✔After recovery of an A2L refrigerant, the system should be ___________ -
✔✔purged with dry nitrogen
✔✔When evacuating an A2L system, the vacuum pump must be___________ -
✔✔rated for use with A2L refrigerants
✔✔For evacuation, some manufacturers of A2L equipment require that the system be
___________ - ✔✔triple evacuated
✔✔When charging an A2L system where ventilation mitigation has been installed, the
maximum allowable charge cannot exceed the ___________ charge weight. - ✔✔M2
✔✔When charging an A2L system where ventilation mitigation has not been installed,
the maximum allowable charge cannot exceed the ___________ charge weight. -
✔✔M1
✔✔___________ should be used to prevent unauthorized access to the refrigerant
circuit. - ✔✔locking refrigerant caps
