| 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? |
| A) The machine definitely does not have a leak, therefore no attempt at leak detection is necessary. |
| B) The machine may or may not have a leak, therefore the machine should be checked for leaks. |
| C) The machine definitely has a leak, therefore the refrigerant pressure should be reduced to 35 psig prior to checking for leaks. |
| D) The machine definitely has a leak, therefore nitrogen should be added to bring the pressure to 70 psig prior to checking for leaks. |
