Advanced RETA / Refrigeration Refresher

The Advanced RETA / Refrigeration Refresher (ARR) is for existing ammonia refrigeration operators, technicians and engineers whom want a thorough review of topics learned in Operator 1, 2, and RETA CIRO study guide to prepare for the CIRO certification. Many participants take this class as well just to stay fresh and keep their credential hours up to par. This class is available in person and online. RETA CIRO study guide and online practice test will be made available.  Students are responsible for the certification testing fee, RETA applications, and books to use during the review. We suggest that each candidate for this class have at least 2 years industrial refrigeration experience.  We call this review course

ARTS Advanced RETA / Refrigeration Refresher

Aptitudes needed for success are mathematics, observation, applied technology, locating information, reading for information, normal to abnormal troubleshooting, advanced industrial refrigeration design and concepts, and electrical.  The class in a person is a 3-day session and is taught by a RETA RAI (Jeremy Williams) and online you have six months to complete.  Candidates whom score well on ARTS review course do will in the RETA CIRO exam.  All ARTS certifications are active for a three window and carrier of those credentials must follow all company and regulator procedures. 

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We suggest that you bring you past Ammonia Operator 1 and 2 books and the course will be supplemented with the book “Seeing Industrial Refrigeration from the Inside Out”.  Participants will have the option of sitting for the RETA CIRO Examination after the refresher course.  (Candidates must meet RETA requirements for testing and testing fees are separate). For RETA requirements and testing fees please contact our office.

Review/Refresh Subjects 

  • Safety
  • Ammonia as a Chemical
  • Heat Transfer
  • Saturated / Superheated / Subcooling (Measurements)
  • Compressor Applications
  • Two-Stage
  • Cascade Refrigeration
  • Condensers
  • Purging
  • Refresher Exam of Ammonia Operator 1 material
  • Troubleshooting CIRO Screens
  • Expansion Valves
  • Control Valves
  • Liquid Feed(s) to Evaporators
  • Defrost
  • Enthalpy
  • Psychometric
  • Brake Horse Power (BHP)
  • Kilowatts (Kw)
  • Power Cost in Dollars
  • HP/TON
  • Kw/TON
  • RETA Figures Electrical Schematics and Ladder Diagrams
  • Compression Ratio Calculations
  • Practice Questions relating to CIRO Screen and Calculations
  • Plus More


RETA CIRO Advanced Refresher ARTS

CIRO Certification Review and Refresher