Protocol will depend on size of collection, amount of gas in column and whether or not you have a valve from material column to collection pot. You don’t want to heat the column and send dark oil down into the collection in the case of OP @australis . That valve is a game changer
It’s quite a complicated situation unless we know your whole set up.
I really dont run passive, but if your solvent tank is cold enough it should pull a vacuum on the rest of your system