A high-pressure centrifugal chiller currently charged with R-134a is being evaluated for the need for leak testing. Using the leak-test procedures decision tree illustrated and the R-134a pressure-temperature chart illustrated, with the machine idle and the pressures equalized at 10 psig with an ambient temperature of 60 ° F, what statement is true? GS-RA-47 Illustration GS-RA-47: the U.S. Coast Guard has not released this illustration.
Official USCG Answer & Rule Citation
Correct Answer: Option B — The machine has a suspected leak, therefore the refrigerant pressure should be raised to 35 psig by adding refrigerant prior to checking for leaks.
Under USCG National Maritime Center examination standards, the accepted correct answer is: The machine has a suspected leak, therefore the refrigerant pressure should be raised to 35 psig by adding refrigerant prior to checking for leaks..
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