Posted by Bob P. on October 22, 2000 at 13:40:15: via: or 157.238.208.176
In Reply to: Long/boring - NO WAY! It is an honor... posted by JJMuccio on October 22, 2000 at 12:28:40:
Great post! A lot of good information here.
I believe the statements about moisture in new oil. When working on a new system or adding a full oil charge, I have always put the oil into a charging cylinder first and put it under vacuum. I have seen it bubble for up to 1 hour (new, fresh out of sealed bottles).
Don't always get this chance though. I've used a lot of the small 2oz refrigerant / oil charges and "hoped" they were dry.
I was intrigued with the statement that some new dyers are already wet. Other than a vacuum, how would you ever draw out the moisture? Heat obviously. I'm not sure how much of the moisture would come out of a dryer if it were already saturated with mositure and only a vacuum was used. I have tried to always pull a long, deep vacuum, but I haven't resorted to heat lamps yet (keep in mind that I do as much residential as automotive so "starting the engine" doesn't always work for heat).
This post raised a lot of questions in my mind. I wonder at what point one of those sight glass / dry indicators with the green ring would turn yellow? How many ppm of water would it take in the system? I've installed them on residential units and they have always remained green when I check them later. Don't believe I've ever seen a moisture indicator installed on an auto ac system.
Need to give the moisture issue more thought.