Determining Amount of Freon in Machine

[cvb141]

Johnie ,
Doesn't the valve open clockwise and close counter clock wise?
Jerry

[ZMonet]

For me, the valve is certainly open because freon can escape.  I just can't figure out why I can't get a reading.  If the compressor were not running properly is it possible for it to show no reading?  Since some freon is being forced out that would seem to mean that there is pressure coming from the compressor.  I believe I have both the valves on the gauges closed so I don't know what else it could be.

As an aside, how much freon does an empty original Ideal Slider take?  10 oz?  How do you measure in 10 oz if you have a 12 oz can?  Can you just add some freon...then start the compressor and see if it makes a difference and then add more as necessary?  I assume once you tap the can you only have so much time before leakage from the tap starts to occur.  I have oil charge as well...should that be added with the R12?

[globalcompressors]

Don't just add freon without getting a true reading from the
gauges. Get a working set 1st, and find out what the "static" pressure is...turn the machine on...see what the gauge pulls
down to. If it doesn't move, and the gauges are good, your compressor either isn't running or not pumping.

Jerry, you're right...counterclockwise...valve seat is fully closed.
Clockwise...opening up.

You only need to "crack" it half a turn or so to get a solid reading
or to "bump" the charge.

Eric