Hello All, Just have a question on my mind and would really appreciate someone to shed light on. I just started in the supermarket side [from residential] 2 months ago. We are doing grocery store reno's, and I am becoming great at brazing and doing kick plates =]. Anyhow We have 3 walk ins with the evaps to install tomorow. The TXV for each came seperatley. We opened up one of the evaps and I was shown these "orifices" as someone called them, and to make sure I install the correct one for the correct refrigerant. I looked on the package and they were labeled as nozzles. I didnt get as far as seeing if their was any literature on them.
Long story short I was curious why would the system need an orifice if its going to employ a TXV to meter refrigerant? And if it's job isnt to meter refrigerant whats the purpose of it?