It's been quite a while since I've had an opportunity to visit a refrigeration production facility, but one thing that sticks with me is that I never observed any provisions for nitrogen flow while brazing. Like, what's the point in taking all that care in piping up a system if all the coils and units are full of black cornflakes?
I went through the operation at Phoenix in Conyers, Ga maybe 15 yrs ago and they were using some kind of new inert gas shielded brazing deal. Is that common today? I dunno and I'm a little out of touch.
I'd just like to know that the stuff we buy is put together as carefully as when we here in the field go to install it.