Hello. I hope someone out there will be able to provide me with some good advice. I have a chilly1 2-stage cascade with 2 NF9FX compressors, coil-in-coil HX, and CPEV on the 2nd stage. Gasses are R507 on the 1st stage and r1150 on the 2nd stage. Unit is tuned for variable load (due to the cpev I think). Static pressure is 60psi on the 1st stage and 140psi on the 2nd stage. I am reading about -33C on the HX and -90c on the evap with no load. The unit used to get colder (into the -100c to -110C range unloaded) but I don't remember if the static pressures have changed.... I was wondering if these look like ideal static pressures and if either the high or low stage could use some more gas.
Also, just to make sure...screwing the knob on the CPEV "in" will increase the amount of refrigerant going to the evap and thus allow it accommodate greater loads correct? And screwing it "out" will decrease the refrigerant but lower temps on a lighter load? Another silly question but I'm assuming its safe to screw the CPEV knob all the way in and out when testing...no chance of it coming out or causing a blockage/pressure buildup, right? (I'm assuming thats what the CP part of CPEV means).
Finally, a question of maintenance. I vaguely remember being told something about cycling the unit. Does it need to sit for a certain period of time between sessions? Is there anything I need to do for general maintenance? I would ask the man himself but Chilly1 doesn't check his PMs all the time.
The unit has been in storage for over a year and I kinda forgot how to deal with it in the interval so don't want to take any chances while I'm starting to use it again. Assistance greatly appreciated.
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