Hold your horses now, guys.........
As I read this thread, it has yet to be established what refrigerant this system was originally set up for. (We all know it wasn't built for Hot-Shot).
There's no nameplate info given or TXV identifiers noted anywhere. We don't even know if this compressor is a proper replacement for the job.
It was mentioned that this CS20K6E is multi-rated for R134A HT, R22 MT and R404A EMT (Extended MT). The original post says this is a cooler, so if you check capacities at +20ºF SST/ 120ºF SDT for each of these refrigerants we find that R22 and R404A are about equal at 20,000 Btuh and R134A comes in at around 12,000 Btuh. That's a big difference.
We need a lot more info on this system before we start recommending what refrigerant to be putting in it.
Sgosine557.....How about some info on the TXV, the evaporator coil or the original condensing unit dataplate?