|QUESTIONS AND VERIFIED ANSWERS|GRADED A+|PASS FIRST AT-
EPA Section 609 certification - ANSWER To legally service Motor Vehicle Air Conditioning
(MVAC) systems and purchase automotive refrigerant.
R-12 refrigerant phase-out reason - ANSWER It contributed to depletion of the earth's
ozone layer.
Global Warming Potential (GWP) of R-1234yf - ANSWER 4
Prohibited practice when servicing MVAC systems - ANSWER Intentionally venting refrig-
erant into the atmosphere.
Minimum time required for A/C system operation with fluorescent dye for leak detection -
ANSWER 15 minutes.
Refrigerant that is mildly flammable and requires specific safety procedures - ANSWER
Safety equipment required when servicing MVAC systems - ANSWER Safety goggles with
side shields and insulated gloves.
What is cross contamination in MVAC systems ? - ANSWER Having refrigerant other than
the type designated on the system information label
How often should refrigerant handling equipment be calibrated ? - ANSWER According to
manufacturer's specifications
1
, What percentage of its gross weight capacity should a refrigerant storage tank never exceed
? - ANSWER 60 %
When checking for evaporator leaks using an electronic detector , how long should you wait
after turning off the blower ? - ANSWER 13 minutes
What is the proper procedure if contaminated refrigerant is detected ? - ANSWER Dis-
pose of it properly through EPA - certified facilities
Which document contains essential safety information about refrigerants ? - ANSWER
Safety Data Sheet ( SDS )
What is the minimum vacuum level required for R - 1234yf systems before recharging ? - AN-
SWER 0.011 MPa A ( 3.32 in . Hg absolute )
How should refrigerant cylinders be stored ? - ANSWER Below 52 degrees C ( 125 degrees
F)
What percentage of the total charge does a R - 1234yf system receive initially during auto-
mated charging ? - ANSWER 15 %
What is the proper procedure if a leak is detected during system charging ? - ANSWER Lo-
cate and repair the leak before continuing
Which standard applies to R - 1234yf recovery / recycling / recharging equipment ? - AN-
SWER SAE J2843
What should be done with disposable refrigerant containers that appear empty ? - AN-
SWER Remove remaining refrigerant before disposal
2
EPA Section 609 certification - ANSWER To legally service Motor Vehicle Air Conditioning
(MVAC) systems and purchase automotive refrigerant.
R-12 refrigerant phase-out reason - ANSWER It contributed to depletion of the earth's
ozone layer.
Global Warming Potential (GWP) of R-1234yf - ANSWER 4
Prohibited practice when servicing MVAC systems - ANSWER Intentionally venting refrig-
erant into the atmosphere.
Minimum time required for A/C system operation with fluorescent dye for leak detection -
ANSWER 15 minutes.
Refrigerant that is mildly flammable and requires specific safety procedures - ANSWER
Safety equipment required when servicing MVAC systems - ANSWER Safety goggles with
side shields and insulated gloves.
What is cross contamination in MVAC systems ? - ANSWER Having refrigerant other than
the type designated on the system information label
How often should refrigerant handling equipment be calibrated ? - ANSWER According to
manufacturer's specifications
1
, What percentage of its gross weight capacity should a refrigerant storage tank never exceed
? - ANSWER 60 %
When checking for evaporator leaks using an electronic detector , how long should you wait
after turning off the blower ? - ANSWER 13 minutes
What is the proper procedure if contaminated refrigerant is detected ? - ANSWER Dis-
pose of it properly through EPA - certified facilities
Which document contains essential safety information about refrigerants ? - ANSWER
Safety Data Sheet ( SDS )
What is the minimum vacuum level required for R - 1234yf systems before recharging ? - AN-
SWER 0.011 MPa A ( 3.32 in . Hg absolute )
How should refrigerant cylinders be stored ? - ANSWER Below 52 degrees C ( 125 degrees
F)
What percentage of the total charge does a R - 1234yf system receive initially during auto-
mated charging ? - ANSWER 15 %
What is the proper procedure if a leak is detected during system charging ? - ANSWER Lo-
cate and repair the leak before continuing
Which standard applies to R - 1234yf recovery / recycling / recharging equipment ? - AN-
SWER SAE J2843
What should be done with disposable refrigerant containers that appear empty ? - AN-
SWER Remove remaining refrigerant before disposal
2
