frozen cascade

[kayl]

What captube you running on that second stage?

im using 2.6m 0.031" and around 1.9m on the hot gas bypass.

Nice one Kayl -100c at 250w

Thanxs, i still have a fair amount of insulating to do so that should get a tad colder when finished

My static pressure on this unit was 200PSI, last cascade i did was closer to 300psi, so the expansion tank has really helped reduce my static pressure

Might want to try a very short segment of capillary tubing setup post HX that'll dump all the R1150 from the HX and rob the evap of refrigerant. I need to re-do mine to put a solenoid on the oil return also but this does work rather nicely on my evap, it warms up very quickly. Not a perfect solution but I didn't want to dump oil laden refrigerant into the evap.

Im still thinking not sure what way to go. But i think alot shorter length might work. I didnt want to go to short at the start as i didnt want the hotgas bypass to be too aggressive, didnt think it would have little to no effect at this length considering im pumping hot gas into the head.
Does your oil sep have a float?? I didn’t want to use to many solenoids in the cascade and only wanted one to battle the cold boot. I also didn’t want to stick cold fluids through the solenoid.

I have one n00b question regarding the quantity of 'shot of propane'. If you use R402a with mineral oil, is it okay (since R402a contains some % of R290)? How about R404a? How much is this 'shot' of propane?

the general rule ppl use is pull a vacuum then break that with r290 through the high side till ya reach 0psi on the low side then charge with r404a/r507 what ever you want. r402a only has 2% propane in their blend to carry the oil.