All of the following statements are true EXCEPT:

A. if mineral oil is mistakenly installed in an R-134A system, it will not lubricate the compressor properly and will separate in the accumulator.
B. moisture causes fewer problems in R-134A systems because it mixes with the PAG oil.
C. moisture control in R-134A is provided by the desiccant in the receiver/dryer or the evaporator.
D. commercial refrigeration units use ester oils, which are hygroscopic.


Answer: D

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