Posted by MarkB_MI on February 10, 2021 at 03:22:00 from (174.230.0.171):
In Reply to: Pulling down AC posted by David G on February 09, 2021 at 18:54:28:
The danger of pulling a vacuum too long is you can boil the refrigerant oil. You have to get below 250 microns to do that; a good vacuum pump can pull 50 microns or less, but that's not the whole picture. Most hose sets aren't good enough to pull a decent vacuum, even if your pump is up to the task. If you use copper line instead of hoses, you'll have better results.
Bottom line: you'll never know what's actually going on without a micron gauge. You can buy a decent gauge for 150 bucks. Without a micron gauge, I wouldn't worry about two hours using a typical pump. If this is a new unit where the refrigerant is still sealed in the compressor, there's no risk of boiling the oil since it's segregated from the vacuum until you open the valves.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
