| 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? Illustration GS-RA-47 |
| A) The machine has a suspected leak; therefore nitrogen should be added to bring the pressure to 70 psig prior to checking for leaks. |
| 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. |
| C) The machine definitely does not have a leak; therefore no attempt at leak detection is necessary. |
| D) The machine may or may not have a leak; therefore the machine should be checked for leaks without any adjustments in pressure. |
