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post #12 of Old 07-02-2013
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Re: Adler Barbour CU-100 short cycling

Originally Posted by deniseO30 View Post
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.

Point is, with 134 and refrigeration systems like these. They will get cold/freeze.. until later. much later. It takes quite some time for the pressures to stabilize when the little compressor is running if it's over charged. the discharge pressure will rise.. slow, very slowly. But yes, Schock, we all do it R-12 and other CFC freons still react faster then compounds like 134. I don't like it.. but it's here to stay

I still run R-12 in my old car it's great. It's weird sitting in a newer car or truck and waiting for the 134 to start cooling
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"?

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