If I have a conventional txv in a system with fan cycling and head pressure control and I set the superheat at say 10 degrees when ambient is low (Winter) would I see a drop in superheat when the ambient rises in the summer?
I believe you would due to an increase in head pressure which is a opening force. Am I right? I had this discussion with another tech who said the valve will maintain the same superheat throughout all seasons. To me a change in head pressure is no different than a change in spring pressure. Both are opening forces and changing either one will effect superheat.