Im working on a twin circuit carrier system on R22. The problem is with the EXV on circuit A, not being able to open more than 19.1%. I have observed this via CCN and the chiller controller.
Using the test feature on the controller, it seems i am able to open the vavle to 100%.
Anyone able to suggest where to look next, as to why the valve will not open beyond 19.1%, which is resulting in a system pumpdown.