CO2 Hot Gas Defrost Causing Flood back & The Happiest Place In The World & He’s still Angry Episode 535 Audio

CO2 Hot Gas Defrost Causing Flood back & The Happiest Place In The World & He’s still Angry Episode 535 Rusty Cases, Wet Racks & Hot Gas Defrost Chaos (CO₂ Rack Tuning Gone Wild)Hosts Brett Wetzel and Kevin Compass recap a hectic week on the Advanced Refrigeration Podcast, starting with widespread issues from a case manufacturer in Mexico where components arrive severely rusted or even full of water, leading to leaks, missing rack parts, long evacuation times, and concerns that contractors will rush vacuums.They also describe multiple failing case controllers that output erratic signals and drop communication.The conversation shifts to Brett’s work in Vermont teaching and troubleshooting a ZeroZone CO₂ rack hot gas defrost setup, including inlet pressure regulator and relief protection, and how an incorrectly set regulator caused flash tank turbulence, flash gas bypass over-opening, low medium-temp superheat, oil carryover, and compressor issues—especially with horizontal “laydown” flash tanks.They discuss PID tuning challenges, valve reliability, and an oil dump line piping detail that can vent oil straight out of the receiver.