LICENSE/CERTIFICATION: Shelby County 1st class refrigeration operator's license, EPA Universal Certification, and OSHA 10 Certification or higher required OR obtain Shelby County 1st class refrigeration operator's license, EPA Universal Certification, and OSHA 10 Certification within six months of hire. Installs, inspects, troubleshoots, and repairs mechanical equipment such as refrigeration units, pumps, compressors, ductwork, sheet metal systems, and large-scale machinery weighing up to 15 tons.