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MACS 609 Certification Exam – Questions And Solutions
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MACS 609 Certification Exam – Questions And Solutions
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MACS 609 Certification Exam – Questions AndSolutions
If lubricant is removed by recovery equipment during system refrigerant
removal, what must be done with the lubricant? ✔️Ans - 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? ✔️Ans -
Question 2 options:
Recycle the HFC-134a before reuse using certified equipment
When can HFC-134a become combustible in a mobile air conditioning
system? ✔️Ans - 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? ✔️Ans - Accumulator type
Electronic leak detectors certified to SAE J2791 have the capacity of
identifying leakage rates as low as: ✔️Ans - 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? ✔️Ans - Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals
are installed? ✔️Ans - To minimize refrigerant loss
Which of the following statements is correct about flushing A/C systems?
✔️Ans - 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? ✔️Ans - 5
minutes
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