Hi guys, I've got a bit of an issue I don't fully understand yet. I have a carrier 30GXR249-A-640EL. This client wanted me to take a look at it today while we were there for some other work. What went from half working went to offline- both circuits are failing out on T124 and T125. Ambient today was 100 and chilled water got up pretty warm to 85. I started to familiarize myself with the chiller- first system a was offline. I dind't make any changes to anything- was in observation mode. I sat down to see what the error was about and say that it was the float switch in the oil res was open. The client was insisting that it was out filters being plugged, but after gaining understanding of the error, I dind't aggree with that. As I was sitting there the b circuit tripped on the same lock out. So, I read further in the manual and gained the best understanding I could for the crash course time I had.
What senarios cause oil loss on these chillers? With what I could understand, it looks like the oil simply comes back with the refrigerant in the suction stream, is this true or is there eductors like Yorks? The chiller is in neglect- B was carpeted over and was running about 220/40 4 degree delta and with A running one comp fully loaded it was about 160/30 with 2 degree delta. I suspect that the a systems are low on refrigerant considering the various spots of oil I saw and the A system evap only at 30 psi with 85 degree water- exv was at 80% I believe. Both sight glasses are bubbling badly.
My current theory is B is loosing oil from running higher than needed head and slightly undercharged and A seems to be undercharged.
I dind't go too much farthur with it- wanted to read some more without someone breathing down my neck and hopefully get some experience passed onto me here. Thanks.