Now that I've been looking at this for a while, there is no easy way to feed Refrigerant into a completely vacuumed system,
(with a vacuumed line-set attached).
Because of the Schrader core valve, needs +pressure inside the line-set to stay sealed.
If there is a vacuum in the line-set, removing the pump hose will allow the 14 PSI
to be sucked inside the line-set. If the large service valve was open, air would
fill the whole system. The Scharder core is basicly a one-way check valve..
Which can be pulled open, from the inside (by low pressure).
Notice that
Pump Down info.. That's going to come in very handy, after I get all the testing done.
Since I might move it over to the house and deploy it on a new HX or another Sanyo indoor unit.