RETA CARO

It is a multiple-choice exam of 110 questions with three hours allowed for completion. The content covers RETA's Industrial Refrigeration I and the ammonia safety chapter of Industrial Refrigeration IV (chapter 7). Confirm current delivery format and scheduling details with RETA when you register.

No. RETA states there is no minimum experience requirement for CARO. It is an entry-level credential intended to demonstrate that an operator has sufficient knowledge to work under supervision in industrial refrigeration. That makes it suitable for trainees and career changers.

RETA does not publish a domain-by-domain percentage breakdown in its certification overview. The exam assesses both Industrial Refrigeration I and the ammonia safety chapter in Industrial Refrigeration IV (chapter 7). Plan to prepare thoroughly for both rather than assuming one dominates.

Certification is valid for three years from the test passage date or the date of the last three-year renewal cycle. Renewal requires documentation of 24 Professional Development Hours (PDH) or 2.4 Continuing Education Units (CEU). RETA emails reminders before expiration, but collecting and submitting documentation is the individual's responsibility.

CARO is the entry-level tier; CIRO assesses more advanced concepts and requires at least two years of documented operator experience. CARO asks for fundamental knowledge and safe engine-room practice, so the difficulty comes from breadth and precision rather than from advanced troubleshooting scenarios.

Yes. RETA states that three of its certification exams, including CARO, are accredited by ANAB (ANSI National Accreditation Board) as having met the ANSI 17024 standard. RETA notes that ANSI standards are recognized internationally and often regarded by regulators such as EPA and OSHA.

Start with Industrial Refrigeration I to build system fundamentals, then work the ammonia safety chapter in Industrial Refrigeration IV (chapter 7) until safety responses are automatic. Finish with timed practice on mixed question sets so you can sustain roughly 110 questions across three hours.

Two common patterns: treating CARO as a safety-only exam and neglecting refrigeration fundamentals, or the reverse. Others misjudge pacing on 110 questions in three hours. Work every review question in both source books, and drill the ammonia safety material until the correct response is immediate.

Not directly without qualifying. RETA requires a current CARO or CIRO credential, or four years of documented industrial refrigeration experience, to take the CRST exam, and documentation must accompany the application. CARO is therefore the usual entry point for newcomers.

RETA's overview states that certification is valid for three years and that reminders are emailed before expiration, with renewal requiring 24 PDH or 2.4 CEU. It does not describe lapse or reinstatement procedures, so contact RETA headquarters directly if your expiration date has passed.