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C-21D Refrigeration and Air Conditioning Maintenance Contractor (2018-03-29)

The repair and replacement of any parts of existing units or systems of air-conditioning and refrigeration, including the compressors, motors, relays, coils, heat exchangers and other appurtenances and equipment, but not the replacement of complete condenser assemblies on remote systems, air handlers or any work that may alter the design of an existing system.

60 Questions
70% Minimum Passing Score
2 Hours

These products apply to test outline dated 2018-03-29

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Open Book These books are allowed while taking your test.
Closed Book These books are for pre-test study only and are not available for use during the test.

  • Closed Book

    Troubleshooting and Servicing Modern Air Conditioning and Refrigeration Systems

    2nd Edition


    The book details a variety of topics and troubleshooting procedures, including the following: refrigerant pressures, states, and conditions, subcooling and superheat, compression systems, metering devices, system charge, diagnosing air conditioning systems, systematic troubleshooting, alternative refrigerants, refrigerant blends an oils, leak detection - evacuation and clean up procedures, ozone depletion and global warming. Troubleshooting and Servicing Modern Air Conditioning and Refrigeration Systems discusses the changes affecting the refrigeration and air conditioning industries with an emphasis on the phaseout of CFC and HCFC refrigerants. Detailed sections on the most current leak detection and evacuation methods are included, as well as a section on alternative refrigerants and retrofit guidelines. The book also includes refrigerant changeover guidelines for the following conversions: R-12 to R-134a; R-12 to R-401A; R-12 to R-401B; R-502 to R-402A/R-408A; and R-502 to R-404A/R-507.

  • Open Book

    Blank Quick Reference Tabs


  • Closed Book

    Modern Refrigeration and Air Conditioning 20th Edition

    20th Edition


    Modern Refrigeration and Air Conditioning is the HVACR standard for a new generation of learner. Whether you're in a digital or print, on-ground or hybrid environment, this integrated learning solution will engage students with resource elements including textbook content, an online learning platform, video clips, narrated animations, digital activities, questions, and hands-on lab activities to assess and to reinforce learning based upon the original HVACR industry standard.

  • Closed Book

    Code of Federal Regulations, 29 CFR Part 1926 (OSHA) 2019

    Publication Year: 2019


    All Federal Construction Regulations (29 CFR 1926) are included in this “perfect bound” book in an easy-to-read, two-color layout.

    All 29 CFR 1926 regulations for construction industry are included along with the following items:

    29 CFR 1903 regulations covering inspections, citations, and penalties
    29 CFR 1904 regulations covering recording and reporting occupational injuries and illnesses
    OSHA keyword dictionary
    Easy to find OSHA interpretations

  • Open Book

    Uniform Mechanical Code 2012


    Uniform Mechanical Code 2012 provides complete requirements for the installation and maintenance of heating, ventilating, cooling and refrigeration systems, while at the same time allowing latitude for innovations and new technologies.