MACS 609 CERTIFICATION QUESTIONS AND
ANSWERS
If lubricant is removed by recovery equipment during system refrigerant removal, what
must be done with the lubricant? - Answer -Re-install lubricant removed by the
recovery equipment
Before reuse, what must be done with HFC-134a that has been recovered from a
mobile A/C system using recovery-only equipment? - Answer -Question 2 options:
Recycle the HFC-134a before reuse using certified equipment
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
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
ANSWERS
If lubricant is removed by recovery equipment during system refrigerant removal, what
must be done with the lubricant? - Answer -Re-install lubricant removed by the
recovery equipment
Before reuse, what must be done with HFC-134a that has been recovered from a
mobile A/C system using recovery-only equipment? - Answer -Question 2 options:
Recycle the HFC-134a before reuse using certified equipment
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
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
