Quote:
Originally Posted by beenthere
I got tired of filling them. Thats time that can be spent doing other things.
Back when I used them. They didin't have digital scales yet(atleast not portable ones).
I did however, discover that they can be a great training aid, when you want to teach someone about saturation_p/t.
PS: When you want to put 4 pounds in the 5 pound cyclinder, and at 3.2 pounds its pressure is equal to the tank your filling from. You are using a recovery machine to remove the vapor to get the rest of the liquid refrigerant in, right?
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Believe me when I say I'm not advocating their use on a daily basis unless your partial to them and set up for it, but I can't simply dismiss them as antiquated technology either, as they are still a valid precision charging method with 1/4 oz accuracy. On the same note though, IMO, anyone that thinks their charging in the field to 1/10oz accuracy with a digital scale or refrigerant meter is fooling themselves, no matter what the scale/meter manufacturer says.
The 5lb models that I have are overkill for what I use them for. The last time I used one of mine was back in June with a total charge of 12.5 oz of R22. I would never even get close to 3 or 4 lbs using one of these. You can use the recover pump or the tank method, which I believe is also outlined in the manual.
I've heard that you could also use an empty evacuated recovery cylinder in a 5 gallon bucket of ice water, depending on how much vapor you really need to bleed off. Haven't tried that one yet, but it sounds feasable.
As long as you use a new clean evacuated recovery cylinder, this collected vapor is still virgin refrigerant and can be used in another system, so it’s not wasted.
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