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 57.4 psig with an ambient temperature of 60° F, what statement is true? See illustration RA-0011. See illustration RA-0047.

Question

Accepted Answer

The machine may or may not have a leak, therefore the machine should be checked for leaks.

Answer

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

Answer

The machine definitely has a leak, therefore the refrigerant pressure should be reduced to 35 psig prior to checking for leaks.

Answer

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

🔍 Key Concepts

💭 Think About

✅ Before You Answer