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Navy NEC · Engineering

742B Refrigeration and Air Conditioning Systems Technician

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

A Navy Enlisted Classification: a skill designation sailors hold in addition to their rating.

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Overview

A Refrigeration and Air Conditioning Systems Technician starts, operates, maintains, and overhauls refrigeration, cooling, and air conditioning equipment that uses centrifugal or reciprocating compressors. This technician identifies abnormal conditions, corrects malfunctions, and recovers and recycles refrigerants in accordance with federal requirements.

Core Skills

  • Centrifugal and reciprocating compressor system overhauls
  • Section 608 refrigerant recovery and recycling
  • Cooling equipment and controls fault correction

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Heating, Air Conditioning, and Refrigeration Mechanics and Installers

Your experience operating, troubleshooting and overhauling refrigeration and air conditioning equipment directly supports civilian cooling-system service work.

How to prepare: Ask a local licensing authority or apprenticeship provider to assess your Navy training, documented experience and existing EPA Universal certification for applicable military credit before choosing additional training. Civilian entry typically involves a postsecondary nondegree award and lengthy on-the-job training, although other entry routes exist; some states and localities require trade licensing separate from EPA certification, and employers or manufacturers may require additional qualifications.

What the civilian work involves
  • Test electrical circuits or components for continuity, using electrical test equipment.
  • Study blueprints, design specifications, or manufacturers' recommendations to ascertain the configuration of heating or cooling equipment components and to ensure the proper installation of components.
  • Discuss heating or cooling system malfunctions with users to isolate problems or to verify that repairs corrected malfunctions.

Industrial Machinery Mechanics

Your compressor-based equipment maintenance, malfunction correction and overhaul experience transfers to industrial machinery repair, especially refrigeration-related equipment.

How to prepare: Target industrial maintenance openings involving compressors or refrigeration equipment, and compare their equipment-specific repair duties with your documented overhaul experience to identify training gaps.

What the civilian work involves
  • Repair or maintain the operating condition of industrial production or processing machinery or equipment.
  • Disassemble machinery or equipment to remove parts and make repairs.
  • Reassemble equipment after completion of inspections, testing, or repairs.

Notes & Sources

  • NEC 742B requires EPA Universal certification, and EPA Section 608 certifications do not expire; retain evidence of your existing certification rather than seeking it again.
Evidence for this guidance (5 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC 742B

    [1] NEC entry "742B - Refrigeration and Air Conditioning Systems Technician"; cached text line 17673; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: Centrifugal and reciprocating compressor system overhauls, Section 608 refrigerant recovery and recycling, Cooling equipment and controls fault correction, Heating, Air Conditioning, and Refrigeration Mechanics and Installers (O*NET 49-9021.00), Industrial Machinery Mechanics (O*NET 49-9041.00)

  2. O*NET: Heating, Air Conditioning, and Refrigeration Mechanics and Installers

    [2] O*NET 30.3 occupational data

    Supports: Heating, Air Conditioning, and Refrigeration Mechanics and Installers (O*NET 49-9021.00)

  3. US EPA: Section 608 Technician Certification Requirements

    [3] Requirements and Types of Certifications; updated July 15, 2026

    Supports: Heating, Air Conditioning, and Refrigeration Mechanics and Installers (O*NET 49-9021.00)

  4. Bureau of Labor Statistics: Heating, Air Conditioning, and Refrigeration Mechanics and Installers

    [4] How to Become; Education and Training; Licenses, Certifications, and Registrations; updated August 27, 2026

    Supports: Heating, Air Conditioning, and Refrigeration Mechanics and Installers (O*NET 49-9021.00)

  5. O*NET: Industrial Machinery Mechanics

    [5] O*NET 30.3 occupational data

    Supports: Industrial Machinery Mechanics (O*NET 49-9041.00)

Defense contractor jobs for 742B

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

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