US 28956-03 | Maintain and service RAC systems and equipment in controlled temperature transport applications

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About this standard This unit standard is for people who maintain and service commercial refrigeration and air conditioning (RAC) equipment in transport applications. People credit ed with this unit standard are able to: prepare to maintain and service RAC systems, maintain and service RAC mechanical systems and components; repair faults in RAC mechanical systems and components; maintain and service RAC electrical and electronic systems and components; repair faults in RAC electrical and electronic systems; retrofit refrigerants; and complete maintenance and/or servicing activities. Show more