1 | Page
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MACS 609 CERTIFICATION QUESTIONS
AND ANSWERS
If lubricant is removed by recovery equipment during system
| | | | | | | |
refrigerant removal, what must be done with the lubricant? -
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correct answer- Re-install lubricant removed by the recovery
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equipment
|
Before reuse, what must be done with HFC-134a that has been
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recovered from a mobile A/C system using recovery-only
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equipment? - correct answer- Question 2 options:
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Recycle the HFC-134a before reuse using certified equipment
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When can HFC-134a become combustible in a mobile air
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conditioning system? - correct answer- If 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? - correct answer-
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Accumulator type
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, 2 | Page
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Electronic leak detectors certified to SAE J2791 have the | | | | | | | |
capacity of identifying leakage rates as low as: - correct
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answer- 0.15 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 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 vacuum,
| | | | | | | | | | |
which would indicate that the system still contains some
| | | | | | | | |
refrigerant? - correct answer- 5 minutes
| | | | | |
| | | | | |
MACS 609 CERTIFICATION QUESTIONS
AND ANSWERS
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
| |
, 2 | Page
| | | | | |
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 vacuum,
| | | | | | | | | | |
which would indicate that the system still contains some
| | | | | | | | |
refrigerant? - correct answer- 5 minutes
| | | | | |
