Hey everybody,

Newbie here.
I have two Trane RTAA 125 ton Chillers looped in parallel. We are having our condenser coils replaced with new ones as they were very deteriorated as we are near the coast. Here is where the problem begins. Both chiller ( which have two circuits each) were running fine with no faults before removal of coils. After coil replacement on one chiller, I'm getting a Oil System Fault on both circuits of that chiller. They run for about 30- 45 minutes before they shut down on this fault. This fault has never shown up in the (5) Five years I've been here. All sensors were good before and still appear to be working fine. The condenser fan staging has been checked as well as the heater circuits. Has anyone ever run into this problem? OR does anyone have any suggestions? I'm just trying to help these guys what I can. They've been to TRANE, and not a lot of help from them. No parameters were changed for this install. They did say that it was low on R22 on ***** on one circuit and they added some.