Under for your interest, the topic, Troubleshooting The
Refrigerent System With Superheat & Subcooling.
It ststes under critical temperture differences.
The low side superheat should be between 20 and 30 de-
grees. A/C manuals i have looked at show adjusting super
heat on fixed orfice systems down to 5 degrees. What am
i missing here?

Thanks for any help.