I was being taught how to do a start up on a rack by a well respected J-man in our company and i am still unclear about some things and what better place to get all answers to my ?s than here.This rack was a zero zone rack with scroll compressor, all regulator vales was of the A8 type. Dont have model /ser#'s, just have a question on how the ddr should be set and where should my diff pressures should be measured.
I observed him putting the system into defrost and then setting the valve, is this correct? Also when i asked where is differential is measured i was unclear of his explanation.I thaught valves of this type should be set with no cases in defrost and the differential should be measured betwen the liquid header and dischrage header? Any replies are thanked in advance and please explain how this should work.