We recently started doing work on some fan coils with CHW coils and HW coils. One of first things I see is oil dripping from drain line of AAV at one of the CHW coils. Go to clean strainers ( totally clogged) and find lots of oil in the Chw.This is on military base. Talk with Public works and sure enough one of the two 180 ton RTA chillers was replaced several years ago because of leaking evap. as well as other problems.
We will be contacting water treatment companies with experience is this.
Would like to hear anyones experience and ideas on clean up. Chilled water coils have two way valves and im assuming all or most of about 50 coils have clogged strainers at this point.