The ideal candidate should know advanced solid-state controls; oil systems safety controls; mechanical sub-cooling; introduction to head pressure controls for energy reduction; introduction to energy management systems (EMS); refrigeration rack oil systems; advanced de-frost diagnosis; and single and parallel compressor system start-up in a supermarket environment. Journeyman-HVAC, Journeyman-EMS, EMS, Installer, Install, Installation, Service Tech, refridgeration, HVAC, refrigeration, HVAC-R, HVAC/R, diagnostic, commercial, service, mechanical, mechanic, AC, field service, chiller, specialist, HVACR, Electrical, start-up, startup.