A Futuristic Litter Box, & Is My Line Size Too Small, Or Do I Have Too Much Load ?? Episode 534

KE2 Chaos, Glycol Lockouts, and Coolselector Pipe Sizing (Plus the Fancy Litter Box Debate)

Brett Wetzel and Kevin Compass open the Advanced Refrigeration Podcast joking about an “automatic litter box” before jumping into a hectic week of glycol case startups and ongoing frustration with KE2 controllers reverting settings, freezing in defrost, and causing temperature control issues even after firmware updates that wipe settings. They discuss glycol skids hard-locking out from small pressure losses and the need to overcharge to prevent random shutdowns, then shift into a practical walkthrough of Danfoss Coolselector for transcritical CO2 piping and electronic expansion valve sizing. Using examples, they show how capacity, line length, pressure drop, and velocity change with pipe size, why winter load matters for oil return, and how oversized or over-open valves can drive excessive mass flow and pressure drop; they also cover limiting max valve opening percentage and briefly reference AKV pulse valve duty cycle behavior.