It seems like the system is out-gassing something (maybe gunk from it's filter) at about 500 microns.
I'll take it down to 500 and within a few hours, or overnight, it will drift back up to 600.
Whatever process(leak?) is going on, it seems stop at 600.
Maybe just below 600 microns is the 'point' where POE oil gives up it's water molecules?
My check-vac process is to close the service valve and let the lines get down to 300,
before opening the service valve again. And see the meter jump back up around 600!
When left to run for a while, it will get down to 550-570 but then the micron gauge
starts flashing the stable LED.. The operation just stalls..
I'll try changing the oil again and see if there is any improvement.
This is not at all like vaccing a line set.. I'm starting to wonder if there is something
inherent to the system that is going to
regulate the pressure to stay at 600??
I'm saying this, because the system is designed to keep up to
500 PSI inside..
I wonder how low they go at the Factory, before charging?
Heck, they might just be doing a nitrogen flush and then flushing that with R410A gas,
followed by the liquid charge.... Since that seems like a cheaper way to go..
