Secondary Low temp refrigeration back to 404a parallel system

[allanbaker]

We have to convert a Low temp system to a normal DX system parallel. Only problem is reusing the evaporator coils. They have had Temper -40 fluid running in them and now we want to go back to *****.....mmmmm big moisture issue. Any suggestions!!??

[Brian_UK]

Good flush with clean liquid, find a way to blow warm, dry, air through the tubing, then evacuate.

Repeat warm, dry air and evacuation then just evac and see what results you get.

[oldesky]

Brian's advice is good. I would just add flushing the liquid with a diaphragm type pump helps as it tends to pulse the liquid and shifts residue that normaly is hard to move. i would finish off with dry nitrogen before evacuation.