Sr, senior, Service Tech, refridgeration, HVAC, refrigeration, HVAC-R, HVAC/R, diagnostic, commercial, service, install, mechanical, mechanic, apprentice, AC, field service, chiller, specialist, HVACR, supermarket, rack systems . T h e Service Tech 3-Industrial is responsible for r epairing, maintaining , diagnosing , testing and performing schedul ed inspections on advanced mechanical refrigeration systems and associated equipment throughout the facility.