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Originally Posted by tangofox007
I thought that the whole point of applying the vacuum was to convert liquids to a gas.
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When you draw vacuum you will convert liquid to gas, but if you draw too quickly the water vapor will actually condense to the point where it freezes, once you have ice in the system, that's it, nothing's coming out.
When you change the pressure of air positive or negatively very quickly you increase the chances of freezing the liquid vapor. Take a can of compressed air or your air compressor and quickly release the air, then feel the outlet port and you will notice it is cold to very cold Similar when drawing vacuum.
So you should draw you vacuum as slowly as possible even down to one inch per hour until you get past 10 inches, by that point most if not all of your vapor is out already and you can draw quicker from then on.
You should also apply some heat, a blow dryer works good to the condensor and especialy the dryer filter as you draw vacuum, this will allow the liquid to turn to gas and be drawn out of the system. Or you can just draw super slow until 29 inches are achieved, in this way you do not run the risk of forming ice or compromising the seals.
I hope that explains it a bit better.