MACS 609 Certification – Complete Study Guide
and Exam Preparation Material
If lubricant is removed by recovery equipment during system refrigerant removal, what
must be done with the lubricant? - correct 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? - correct 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? - correct
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? - correct answer -Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage
rates as low as: - correct 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? - correct answer -
Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals are installed? -
correct answer -To minimize refrigerant loss
and Exam Preparation Material
If lubricant is removed by recovery equipment during system refrigerant removal, what
must be done with the lubricant? - correct 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? - correct 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? - correct
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? - correct answer -Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage
rates as low as: - correct 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? - correct answer -
Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals are installed? -
correct answer -To minimize refrigerant loss
