Macs 609 Certification Qestions With Verified Solutions

MACS 609 CERTIFICATION QESTIONS WITH
VERIFIED SOLUTIONS


If lubricant is removed by recovery equipment during system refrigerant removal, what must be done with the lubrican
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- answersRe-install lubricant removed by the recovery equipment
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Before reuse, what must be done with HFC-134a that has been recovered from a mobile A/C system using recovery-
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only equipment? - answersQuestion 2 options:
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Recycle the HFC-134a before reuse using certified equipment me, me, me, me , me, me, me,




When can HFC-134a become combustible in a mobile air conditioning system? - answersIf shop air is used in the
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system in an attempt to check for leaks and HFC-134a is present
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Which type of mobile A/C system will usually require additional time / precautions to extract all the refrigerant? -
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answersAccumulator type
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Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as low as: - answers0.1
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ounces per year
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When recovery/recycling equipment is used to remove refrigerant from a mobile A/C system, how much lubricant will
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removed during the operation? - answersGenerally, very little, if any
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Why is it necessary to insure that service port caps containing good seals are installed? - answersTo minimize
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refrigerant loss
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Which of the following statements is correct about flushing A/C systems? - answersFlushing solvents may remain in
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A/C systems, causing problems
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When using an HFC-134a refrigerant recovery machine, after competing the first recovery process, how long must yo
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wait, then check the machine's gauges for a rise in pressure above vacuum, which would indicate that the system still
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contains some refrigerant? - answers5 minutes
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Which type of tank must be used during the transfer of refrigerant? - answersQuestion 10 options:
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Tanks marked DOT 4BA me, me, me,




When it has been determined that an A/C system has a low refrigerant charge, what should be done? - answersPerfo
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a leak detection procedure
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One effect of some refrigerant gases in the atmosphere is that they: - answersContribute to trapping heat
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Mixing CFC-12 and HFC-134a in the same system will: - answersResult in refrigerant cross contamination
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How much moisture is removed from a mobile A/C system during a typical evacuation? - answersPossibly none
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