And I'm saying it "ain't that easy." As I mentioned, "lower end" systems with piston/ orifices can sometimes "not" be sized properly--even if they are "sized properly" because of wide variation in operating conditions. It's one thing to size systems in a climate like tucson and quite another "up here" and I have been there done that. That is why, EG, back in the day, some systems required add-on head controls. It's why under those conditions (and it not always can be done or is done) talk the customer into "more money" for a TXV instead of an orifice. Or maybe even two smaller systems that can be staged. As I ALSO mentioned--some modern systems with capacity control HELP TO alleviate this problem.
