A2L -Low Global Warming Potential
(LGWP) MACS 609 CERTIFICATION
Exam and All Actual Answers.
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - Answer
Approved by some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - Answer Contribute to
trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - Answer
Sludge
When it has been determined that an A/C system has a low refrigerant charge, what should be
done? - Answer Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - Answer Acid
Which of the following is unlikely to affect refrigerant charge accuracy? - Answer A/C
Compressor
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery equipment
has: - Answer Quick-couple design
What is the advantage of using refrigerant identification equipment? - Answer Allows the
ability to determine what type of refrigerant is in system
If an HFC-134a A/C system still has pressure after the first refrigerant recovery process is
complete (including the five-minute pause), additional recovery is necessary until the system
vacuum level remains stable for: - Answer 2 minutes
Paid technicians who service or repair buses using HCFC-22 as refrigerant, and/or service or
repair aircraft or ship/boat cargo refrigeration equipment: - Answer Must be Section 608
Type II Certified
Specific safety information for managing incidents involving refrigerants and other chemicals
(inhalation, spills, fires, etc.) is found in the: - Answer Material safety data sheet (MSDS) for
the chemical
, To what does Global Warming Potential (GWP) refer? - Answer Relative ability to produce
global warming effect
When performing engine pre-heat for refrigerant removal, the technician should do ALL of the
following EXCEPT: - Answer Make sure the compressor is operating
PAG lubricant: - Answer Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates
as low as: - Answer 0.15 ounce (4 grams) per year
When using an HFC-134a refrigerant recovery machine, after completing the first recovery
process, how long must you wait, then check the machine's gauges for a rise in pressure above
vacuum, which would indicate that the system still contains some refrigerant? - Answer 5
minutes
A/C system service equipment hoses must be equipped with shutoff valves located within
_______ from the "vehicle end" of the hoses. - Answer 12 inches
To what does Ozone Depletion Potential (ODP) refer? - Answer Relative ability to destroy
ozone
Which type of tank must be used during the transfer of refrigerant? - Answer Tanks marked
DOT 4BA
When can HFC-134a become combustible in a mobile air conditioning system? - Answer If
shop air is used in the system in an attempt to check for leaks and HFC-134a is present
Mineral-based lubricants are used in which type of mobile A/C system? - Answer CFC-12
How much moisture is removed from a mobile A/C system during a typical evacuation? - Answer
Possibly none
When recovery/recycling equipment is used to remove refrigerant from a mobile A/C system,
how much lubricant will be removed during the operation? - Answer Generally, very little, if
any
Mobile A/C system design changes, new service procedures and equipment have been
developed for what reason? - Answer To reduce lifetime refrigerant emissions
(LGWP) MACS 609 CERTIFICATION
Exam and All Actual Answers.
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - Answer
Approved by some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - Answer Contribute to
trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - Answer
Sludge
When it has been determined that an A/C system has a low refrigerant charge, what should be
done? - Answer Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - Answer Acid
Which of the following is unlikely to affect refrigerant charge accuracy? - Answer A/C
Compressor
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery equipment
has: - Answer Quick-couple design
What is the advantage of using refrigerant identification equipment? - Answer Allows the
ability to determine what type of refrigerant is in system
If an HFC-134a A/C system still has pressure after the first refrigerant recovery process is
complete (including the five-minute pause), additional recovery is necessary until the system
vacuum level remains stable for: - Answer 2 minutes
Paid technicians who service or repair buses using HCFC-22 as refrigerant, and/or service or
repair aircraft or ship/boat cargo refrigeration equipment: - Answer Must be Section 608
Type II Certified
Specific safety information for managing incidents involving refrigerants and other chemicals
(inhalation, spills, fires, etc.) is found in the: - Answer Material safety data sheet (MSDS) for
the chemical
, To what does Global Warming Potential (GWP) refer? - Answer Relative ability to produce
global warming effect
When performing engine pre-heat for refrigerant removal, the technician should do ALL of the
following EXCEPT: - Answer Make sure the compressor is operating
PAG lubricant: - Answer Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates
as low as: - Answer 0.15 ounce (4 grams) per year
When using an HFC-134a refrigerant recovery machine, after completing the first recovery
process, how long must you wait, then check the machine's gauges for a rise in pressure above
vacuum, which would indicate that the system still contains some refrigerant? - Answer 5
minutes
A/C system service equipment hoses must be equipped with shutoff valves located within
_______ from the "vehicle end" of the hoses. - Answer 12 inches
To what does Ozone Depletion Potential (ODP) refer? - Answer Relative ability to destroy
ozone
Which type of tank must be used during the transfer of refrigerant? - Answer Tanks marked
DOT 4BA
When can HFC-134a become combustible in a mobile air conditioning system? - Answer If
shop air is used in the system in an attempt to check for leaks and HFC-134a is present
Mineral-based lubricants are used in which type of mobile A/C system? - Answer CFC-12
How much moisture is removed from a mobile A/C system during a typical evacuation? - Answer
Possibly none
When recovery/recycling equipment is used to remove refrigerant from a mobile A/C system,
how much lubricant will be removed during the operation? - Answer Generally, very little, if
any
Mobile A/C system design changes, new service procedures and equipment have been
developed for what reason? - Answer To reduce lifetime refrigerant emissions
