And i want training that improves field diagnostics on CO2 racks and electronic expansion valves, not just theory… Spent 3 hours last Tuesday on a Hussmann transcritical rack with a Carel EEV hunting (superheat bouncing 4–18°F) after cleaning strainers and recalibrating probes — any courses or webinars that taught you actionable steps for tuning, logging, and preventative checks?
Had a Hussmann transcritical with a Carel driver doing “bouncing 4-18F” until I logged EEV steps and slowed the loop — bumped SH filter to about 10 s, set an 8–10% min open, and capped step change per sample so it stopped overshooting (like teaching the valve to sip, not chug). Most actionable CEUs for me were Danfoss Learning’s CO2 Advanced (https://learning.danfoss.com) and Parker Sporlan’s EEV commissioning; Carel’s EVD/e2v modules are solid too — just don’t over-smooth or you’ll mask real load swings.
Backing @danny_r56 on loop tweaks, but my fix on a similar Hussmann was a noisy suction transducer — SH was “4–18°F” until I replaced it and added a snubber, then the Carel valve settled. For CEUs with real tuning steps, Danfoss Learning’s CO2/EEV diagnostics walks you through 1‑s trending and a quick flash‑gas valve hold test during SH tuning (https://learning.danfoss.com). Since you already cleaned strainers and recal’d probes, try an FGV hold for 5 minutes and see if the bounce follows transducer noise instead of control parameters.
Most practical I’ve taken was Hillphoenix’s CO2 Diagnostics — trend Carel pRack steps, tune PI live, and you leave with a hunting checklist: https://www.hillphoenix.com/learning-center/.