Today I vacuumed unit few times, to be sure, that there isn`t any ethylene, cause I cuted a little bit captube (30cm) and I must braze it...ethylene is flammable, so :p

when I finished brazing, I pulled vacuum 3 times and charged unit with propane-butane to 4bar, and then to 6bar with co2.

I turned on the unit, and charged with propane to flush the HX. When HX temp droped to -34*C, I started with adding CO2...and after 30min of tuning to have the possible lowest temp I`ve got this...



HX temp -34*C

Discharge pressure -- I don`t know, I didn`t connected manometer.
Low side pressure -- -0,9bar (vacuum).

Earlier I had -74*C with 3psi low side pressure.

Tomorrow I will have fun with dummy load

Cheers, very happy LukeXE !