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- Q624 - General Subjects
187. A high-pressure centrifugal chiller, currently charged with R-134a, is being evaluated for leak testing. The machine is idle, the pressures equalized at 10 psig, with an ambient temperature of 60°F. Using the leak test procedures decision tree and the R-134a pressure-temperature chart, what statement is TRUE? RA-0094_1.jpgRA-0094_2.jpg
The low system pressure (10 psig) compared to the expected saturation pressure (approximately 57 psig) at 60F indicates a suspected leak, requiring refrigerant addition to 35 psig before leak testing, as per the leak test procedures.
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