Originally Posted by deniseO30
Really small units are really really difficult to charge by gauges Schock, just the hoses hold almost the same amount as the unit LOL Think it's an ounce per ft, if i remember right
That's exactly why I DON'T like to charge by weight in small systems. The refrigerant in your gauges, and even the weight of your hoses themselves can affect the scale! Instead I charge the system, let it pull down with an empty box, and then adjust the charge so I have around 5-10 degrees of superheat at minimum load. It's the way the old fridge guru I apprenticed under taught me, and it has served me well.
I've never noticed any difference in "behavior" between R-134a and R-12. The 134a is about 10% more efficient, but they still change states and do their job in exactly the same way. I don't know what you mean by "react faster"?