G'day all,

In the spirit of the recent question on ensuring your manifold and hoses are as empty as possible before disconnecting, I have a question that has been puzzling me.

I now have a recovery unit. When I recover a system and purge the machine at the end, there always remains a significant quantity of liquid in the hose between the machine and the recovery cylinder.

The only way I've been able to get reasonable results is by finishing up with a cylinder cooling cycle to chill the cylinder _way_ below ambient, and heat the hose up. I still lose quite a bit of vapor, but no liquid this way.

What is the correct way of minimising refrigerant loss at the end of a recovery?