Re: Vacuum out AC System----cheap way???

Posted by NC Wayne on May 05, 2007 at 16:24:48 from (166.82.164.156):

In Reply to: Vacuum out AC System----cheap way??? posted by Leaky Boot on May 05, 2007 at 06:35:27:

Only been certified for a few years now on mobile equipment but in that time I've seen a couple of systems that weren't "living up to their potential" because they weren't charged right. The first system I opened had been discharged several times and then filled with a can several times over the course of a few years. In other words it had never been properly evacuated any of the times after discharging (due to a small leak) so it had remained full of moisture. Remember if the refrigerant leaves then moisture can get in. When I opened it up the inside of the lines were coated in a slimy residue. I wound up replacing all the lines as well as the compressor to get that system back in operation. It's now been going for several years with no problems. In your case of you open it and immediately close it your not gonna get moisture in it to that degree but there is still gonna be oisture in the air. One good reason for pulling a vacuum is so you can isolate the system with the vacuum on it and make sure there are no system leaks before you spend money on refrigerant that's just gonna leak out. If you can pull a good vacuum and the system will hold it then you can be sure it's gonna keep the refrigerant inside. Not to mention at todays prices who want's to buy a couple of pounds of the stuff and go through the trouble of charging the system a couple of times every year? Secondly moisture in the system can and will cause sludge and corrosion from the inside just as I described above. If your system utilizes an orifice tube then particles caused by corrosion or sludge can get into that orifice and cause system degredation or outright cause it to fail. Lastly there is only so much room in the system and you need x amount of refrigerant for the system to operate to it's potential. If you have to leave out x amount of refrigerant because you left x amount of air in the system then the system is gonna run x amount less efficient than it otherwise would. This means it's having to work harder to do what amount of cooling it is doing and that in itself is gonna reduce the life of the compressor. In the end there's a right way of doing things and a wrong way. Do them the right way and you know the system is gonna work to it's potential and your gonna stay cool this summer, do it the wrong way and your just taking an chance and potentially asking for trouble...and you know if it goes out it's gonna do it on the first day of one of those 100 degree weeks when your way to busy to stop and do it again.....Just my .02.

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