I have 2 York centrifugal chillers with SS starters (I believe 14L). Unit #1 has been running fine and #2 was the backup chiller. I rotated chillers and started #2. After approx. 5 min., the unit shut down on Half Phase. I tried it again and the same thing happened. I checked the York Operation, Start-up and Service instruction and referenced the troubleshooting flow chart for Half Phase. It states that if the chiller runs, the “Shutdown was caused by AC powerline disturbance”. I have several questions.
1) If I have a powerline disturbance but the other chiller runs, what should I be looking for?
2) The flow chart rules out a bad SCR or a bad trigger board because the unit initially runs. Couldn’t these components still be faulty?
3) Any suggestions as to my next steps to be taken?
I appreciate your help!