MACS 609 CERTIFICATION UPDATED ACTUAL
FINAL EXAMS QUESTIONS AND ANSWERS SURE
A+
✔✔Paid technicians who service or repair MVAC-like appliances (like farm equipment
and off-road vehicles): - ✔✔Must be Certified by the Section 609 program or Section
608 Type II
✔✔During HFC-134a refrigerant recovery, when gauge readings indicate pressure in an
A/C system after a 5-minute pause since the system was drawn into a vacuum, you
should: - ✔✔Repeat the recovery process
✔✔It is not recommended by the US EPA, but adding refrigerant to a leaking A/C
system is: - ✔✔Permitted, unless local or state laws prohibit it
✔✔Mixing CFC-12 and HFC-134a in the same system will: - ✔✔Result in refrigerant
cross-contamination
✔✔Which of the following can result in air-contaminated refrigerant? - ✔✔All of the
answers are true
, ✔✔When two or more refrigerants are mixed, what must be done with the mixture? -
✔✔Send off-site to EPA certified reclaimer for reclamation or destruction
✔✔Which of the following statements is correct about flushing A/C systems? -
✔✔Flushing solvents may remain in A/C systems, causing problems
✔✔The technician's first step in A/C system service should be to: - ✔✔Perform a visual
inspection
✔✔HFO-1234yf is classified as "A2L-mildly flammable." This means: - ✔✔It can ignite
under certain circumstances
✔✔If a large amount of lubricant is removed from a system during refrigerant recovery: -
✔✔The system likely contained too much lubricant
✔✔How much time do manufacturers suggest for proper system evacuation? - ✔✔30 to
45 minutes
✔✔Why are shut-off valves located within 12 inches from the "vehicle end" of A/C
service equipment hoses? - ✔✔To minimize venting of refrigerant
✔✔The U.S. EPA has classified HFO-1234yf as "Acceptable, subject to use conditions."
That means: - ✔✔The refrigerant may only be used in newly manufactured vehicles with
components specifically designed for it
✔✔Select the statement that best describes the chemical and operating characteristics
of HFO-1234yf. - ✔✔HFO-1234yf is similar to, but not the same as, HFC-134a
✔✔SAE standard J2210 was superseded by: - ✔✔SAE J2788
✔✔HFO-1234yf can be used in: - ✔✔Any newly manufactured vehicle with an air
conditioning system designed to use it
✔✔If lubricant is removed by recovery equipment during system refrigerant removal,
what must be done with the lubricant? - ✔✔Dispose of it in accordance with federal,
state and local requirements
✔✔Which of the following is the best way to charge an A/C system? - ✔✔Remove
charge, evacuate system, add correct amount of refrigerant
✔✔The transportation industry is moving to new refrigerants that have a lower: -
✔✔Global Warming Potential (GWP)
FINAL EXAMS QUESTIONS AND ANSWERS SURE
A+
✔✔Paid technicians who service or repair MVAC-like appliances (like farm equipment
and off-road vehicles): - ✔✔Must be Certified by the Section 609 program or Section
608 Type II
✔✔During HFC-134a refrigerant recovery, when gauge readings indicate pressure in an
A/C system after a 5-minute pause since the system was drawn into a vacuum, you
should: - ✔✔Repeat the recovery process
✔✔It is not recommended by the US EPA, but adding refrigerant to a leaking A/C
system is: - ✔✔Permitted, unless local or state laws prohibit it
✔✔Mixing CFC-12 and HFC-134a in the same system will: - ✔✔Result in refrigerant
cross-contamination
✔✔Which of the following can result in air-contaminated refrigerant? - ✔✔All of the
answers are true
, ✔✔When two or more refrigerants are mixed, what must be done with the mixture? -
✔✔Send off-site to EPA certified reclaimer for reclamation or destruction
✔✔Which of the following statements is correct about flushing A/C systems? -
✔✔Flushing solvents may remain in A/C systems, causing problems
✔✔The technician's first step in A/C system service should be to: - ✔✔Perform a visual
inspection
✔✔HFO-1234yf is classified as "A2L-mildly flammable." This means: - ✔✔It can ignite
under certain circumstances
✔✔If a large amount of lubricant is removed from a system during refrigerant recovery: -
✔✔The system likely contained too much lubricant
✔✔How much time do manufacturers suggest for proper system evacuation? - ✔✔30 to
45 minutes
✔✔Why are shut-off valves located within 12 inches from the "vehicle end" of A/C
service equipment hoses? - ✔✔To minimize venting of refrigerant
✔✔The U.S. EPA has classified HFO-1234yf as "Acceptable, subject to use conditions."
That means: - ✔✔The refrigerant may only be used in newly manufactured vehicles with
components specifically designed for it
✔✔Select the statement that best describes the chemical and operating characteristics
of HFO-1234yf. - ✔✔HFO-1234yf is similar to, but not the same as, HFC-134a
✔✔SAE standard J2210 was superseded by: - ✔✔SAE J2788
✔✔HFO-1234yf can be used in: - ✔✔Any newly manufactured vehicle with an air
conditioning system designed to use it
✔✔If lubricant is removed by recovery equipment during system refrigerant removal,
what must be done with the lubricant? - ✔✔Dispose of it in accordance with federal,
state and local requirements
✔✔Which of the following is the best way to charge an A/C system? - ✔✔Remove
charge, evacuate system, add correct amount of refrigerant
✔✔The transportation industry is moving to new refrigerants that have a lower: -
✔✔Global Warming Potential (GWP)
