The pressure of a low pressure chiller is raised for leak testing by :

The pressure of a low pressure chiller is raised for leak testing by
 
  A) Circulating warm water through the chiller bundle
  B) Adding nitrogen to the chiller bundle
  C) Adding refrigerant to the chiller bundle
  D) Operating the chiller

 Q. 2

Define predictive maintenance.
 
  A) Performing maintenance and testing whenever the system quits operating correctly
  B) Replacing all system components on a rotating basis
  C) Monitoring key performance indicators and performing maintenance when these indicators show a need for maintenance
  D) Performing maintenance and testing based on a regular schedule

 Q. 3

When leak testing a low pressure chiller, the pressure should not be allowed to exceed 10 psig
 
  A) to avoid freezing the chiller bundle
  B) to avoid causing high compressor current draw
  C) to avoid opening the high pressure cutout and shutting the system down
  D) to avoid breaking the rupture disk and losing the refrigerant charge