1|Page
MACS 609 CERTIFICATION EXAM (LATEST 2026/2027)
|| MOST RECENT EXAM 2026|2027 ACTUAL
COMPLETE REAL VERIFIED EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ | GUARANTEED SUCCESS!!
NEWEST EXAM!!!
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
Which type of mobile A/C system will usually require
additional time / precautions to extract all the refrigerant? -
Answer-Accumulator type
Electronic leak detectors certified to SAE J2791 have the
capacity of identifying leakage rates as low as: - Answer-
0.15 ounces per year
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
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Why is it necessary to insure that service port caps
containing good seals are installed? - Answer-To minimize
refrigerant loss
Which of the following statements is correct about flushing
A/C systems? - Answer-Flushing solvents may remain in
A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine,
after competing 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
Which type of tank must be used during the transfer of
refrigerant? - Answer-Question 10 options:
Tanks marked DOT 4BA
When it has been determined that an A/C system has a
low refrigerant charge, what should be done? - Answer-
Perform a leak detection procedure
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One effect of some refrigerant gases in the atmosphere is
that they: - Answer-Contribute to trapping heat
Mixing CFC-12 and HFC-134a in the same system will: -
Answer-Result in refrigerant cross contamination
How much moisture is removed from a mobile A/C system
during a typical evacuation? - Answer-Possibly none
Paid technicians who service or repair mobile A/C systems
using HFC-22 as refrigerant, or service cargo refrigeration
equipment: - Answer-Must be Section 608 Type II certified
HFO-1234yf is classified as "A2L-mildly flammable." This
means: - Answer-It can ignite under certain circumstances
Section 609 of the Clean Air Act requires that
recovery/recycling equipment: - Answer-Must be
registered with the EPA
What is the advantage of using refrigerant identification
equipment? - Answer-Allows the ability to determine what
type of refrigerant is in system
MACS 609 CERTIFICATION EXAM (LATEST 2026/2027)
|| MOST RECENT EXAM 2026|2027 ACTUAL
COMPLETE REAL VERIFIED EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ | GUARANTEED SUCCESS!!
NEWEST EXAM!!!
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
Which type of mobile A/C system will usually require
additional time / precautions to extract all the refrigerant? -
Answer-Accumulator type
Electronic leak detectors certified to SAE J2791 have the
capacity of identifying leakage rates as low as: - Answer-
0.15 ounces per year
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
,2|Page
Why is it necessary to insure that service port caps
containing good seals are installed? - Answer-To minimize
refrigerant loss
Which of the following statements is correct about flushing
A/C systems? - Answer-Flushing solvents may remain in
A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine,
after competing 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
Which type of tank must be used during the transfer of
refrigerant? - Answer-Question 10 options:
Tanks marked DOT 4BA
When it has been determined that an A/C system has a
low refrigerant charge, what should be done? - Answer-
Perform a leak detection procedure
, 3|Page
One effect of some refrigerant gases in the atmosphere is
that they: - Answer-Contribute to trapping heat
Mixing CFC-12 and HFC-134a in the same system will: -
Answer-Result in refrigerant cross contamination
How much moisture is removed from a mobile A/C system
during a typical evacuation? - Answer-Possibly none
Paid technicians who service or repair mobile A/C systems
using HFC-22 as refrigerant, or service cargo refrigeration
equipment: - Answer-Must be Section 608 Type II certified
HFO-1234yf is classified as "A2L-mildly flammable." This
means: - Answer-It can ignite under certain circumstances
Section 609 of the Clean Air Act requires that
recovery/recycling equipment: - Answer-Must be
registered with the EPA
What is the advantage of using refrigerant identification
equipment? - Answer-Allows the ability to determine what
type of refrigerant is in system
