Page | 1
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? -
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
, Page | 2
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
Which of the following statements is correct about flushing A/C
systems? - correct 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
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? -
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
, Page | 2
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
Which of the following statements is correct about flushing A/C
systems? - correct 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
