Macs 609 Certification Questions With Correct Answers

HFO-1234yf is classified as "A2L-mildly flammable." This means: {Ans: It can ignite under certain circumstances}One effect of some refrigerant gases in the atmosphere is that they: {Ans: Contribute to trapping heat}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? {Ans: 5 minutes}When performing engine pre-heat for refrigerant removal, the technician should do ALL of the following EXCEPT: {Ans: Make sure the compressor is operating}Specific safety information for managing incidents involving refrigerants and other chemicals (inhalation, spills, fires, etc) is found in the: {Ans: Material safety data sheet (MSDS) for the chemical}If lubricant is removed by recovery equipment during system refrigerant removal, what must be done with the lubricant? {Ans: Re-install lubricant removed by the recovery equipment}