What are the stratagies concerning POE oils. Is there a test kit out. Can you save the oil, lets say someone I want tell you who. fire alarm people.
Drilled a whole through evaporator coil with a 12" long bit.
System open for about a week. Manufacture said to pull a good vaccum and make sure system has driers.
I purged nitrogen through it and evacuated. I was under impression to change oil ?

So I need some info as to when to change the oil and when it is safe to evacuate.