started messing with the service valves on the unit. They are the type where
you unscrew a hex-nut cap and that reveals a 1/4" male stud which you use
to open/close the technician's pressure gauges connecting ports. Well, I found out that the valves don't just close the tech's ports. They also close the refrigeration loop.

It was hard for me to tell when the valves were fully closed or when they were fully open so I
Basically cycled both of them from fully opened(or closed) to the other extreme position and counted
The number of turns in between and then let them back off again half the number of turns. That was my dumb but certain way of making sure both valves are open enough so that the refrigerant
Flow isn’t blocked.



Check out this web page.

http://www.muellerindustries.com/wudfs/rsaiv.pdf