CO2 Diagnosis Ejectors, Parallel, Compression, Oil Issues, What Am I Doing ??? -Episode-509 Audio

•Brett Wetzel and Kevin Compass open theadvanced Refrigeration podcast with complaints about constant travel and terrible hotels, including broken blinds, bad smells, and cockroaches, plus a rule for avoiding sketchy areas. Kevin recounts a brutal week on a jobsite with an electrical contractor who miswired coils, phases, and controls, causing repeated troubleshooting, power trips, and a major shutdown when rooftop unit drainage spilled into an electrical trough. He then describes training in Chino, California on a Hussmann CO₂ rack with redundant valves, a suspected stuck oil solenoid causing overheated oil lines and high bypass activity, and how correcting it reduced compressor speed. They debate ejectors and parallel compression control, flash tank instability, oil pressure issues, controller limitations, and note miswired electric defrost heaters and CO₂-to-CO₂ heat exchanger failures.