MACS 609 CERTIFICATION ACTUAL UPDATED QUESTIONS AND CORRECT
ANSWERS
If lubricant is removed by recovery equipment during Re-install lubricant removed by the recovery equipment
system refrigerant removal, what must be done with the
lubricant?
Before reuse, what must be done with HFC-134a that has Question 2 options:
been recovered from a mobile A/C system using Recycle the HFC-134a before reuse using certified equipment
recovery-only equipment?
When can HFC-134a become combustible in a mobile air If shop air is used in the system in an attempt to check for leaks and HFC-134a is
conditioning system? present
Which type of mobile A/C system will usually require Accumulator type
additional time / precautions to extract all the
refrigerant?
Electronic leak detectors certified to SAE J2791 have the 0.15 ounces per year
capacity of identifying leakage rates as low as:
When recovery/recycling equipment is used to remove Generally, very little, if any
refrigerant from a mobile A/C system, how much
lubricant will be removed during the operation?
Why is it necessary to insure that service port caps To minimize refrigerant loss
containing good seals are installed?
Which of the following statements is correct about Flushing solvents may remain in A/C systems, causing problems
flushing A/C systems?
When using an HFC-134a refrigerant recovery machine, 5 minutes
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?
Which type of tank must be used during the transfer of Question 10 options:
refrigerant? Tanks marked DOT 4BA
When it has been determined that an A/C system has a Perform a leak detection procedure
low refrigerant charge, what should be done?
One effect of some refrigerant gases in the atmosphere Contribute to trapping heat
is that they:
ANSWERS
If lubricant is removed by recovery equipment during Re-install lubricant removed by the recovery equipment
system refrigerant removal, what must be done with the
lubricant?
Before reuse, what must be done with HFC-134a that has Question 2 options:
been recovered from a mobile A/C system using Recycle the HFC-134a before reuse using certified equipment
recovery-only equipment?
When can HFC-134a become combustible in a mobile air If shop air is used in the system in an attempt to check for leaks and HFC-134a is
conditioning system? present
Which type of mobile A/C system will usually require Accumulator type
additional time / precautions to extract all the
refrigerant?
Electronic leak detectors certified to SAE J2791 have the 0.15 ounces per year
capacity of identifying leakage rates as low as:
When recovery/recycling equipment is used to remove Generally, very little, if any
refrigerant from a mobile A/C system, how much
lubricant will be removed during the operation?
Why is it necessary to insure that service port caps To minimize refrigerant loss
containing good seals are installed?
Which of the following statements is correct about Flushing solvents may remain in A/C systems, causing problems
flushing A/C systems?
When using an HFC-134a refrigerant recovery machine, 5 minutes
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?
Which type of tank must be used during the transfer of Question 10 options:
refrigerant? Tanks marked DOT 4BA
When it has been determined that an A/C system has a Perform a leak detection procedure
low refrigerant charge, what should be done?
One effect of some refrigerant gases in the atmosphere Contribute to trapping heat
is that they:
