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? Illustration RA-0094. Illustration RA-0047

Question

Accepted Answer

The machine has a suspected leak; therefore, the refrigerant pressure should be raised to 35 psig by adding refrigerant prior to checking for leaks.

Answer

The machine definitely does not have a leak; therefore no attempt at leak detection is necessary.

Answer

The machine has a suspected leak; therefore, nitrogen should be added to bring the pressure to 70 psig prior to checking for leaks.

Answer

The machine may or may not have a leak; therefore the machine should be checked for leaks without any adjustments in pressure.

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