MACS 609 CERTIFICATION QUESTIONS WITH COMPLETE SOLUTIONS
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
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
