Macs 609 Test Answers

Question: 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

Question: 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

Question: 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

Question: Which type of mobile A/C system will usually require additional time / precautions to extract all the refrigerant?

Answer: Accumulator type

Question: Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as low as:

Answer: 0.15 ounces per year

Question: 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

Question: Why is it necessary to insure that service port caps containing good seals are installed?

Answer: To minimize refrigerant loss

Question: Which of the following statements is correct about flushing A/C systems?

Answer: Flushing solvents may remain in A/C systems, causing problems

Question: 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

Question: Which type of tank must be used during the transfer of refrigerant?

Answer: Question 10 options:

Tanks marked DOT 4BA