Oklahoma Refrigeration Contractor Exam Book Package

Prepare for the Oklahoma Refrigeration Contractor examination with a focused exam book package built around the primary technical references used for this Oklahoma mechanical contractor licensing test. This package gives candidates the books needed to study refrigeration systems, electrical controls, refrigerants, piping, refrigeration equipment, system operation, troubleshooting, maintenance, repair, and construction safety.

The Oklahoma Refrigeration Contractor Exam Book Package includes the International Mechanical Code, 2018, Modern Refrigeration and Air Conditioning, 22nd Edition, and Code of Federal Regulations - 29 CFR Part 1926 (OSHA).

The Refrigeration Contractor exam requires a broad understanding of commercial refrigeration systems and the components that make those systems operate. Candidates should be comfortable with electrical theory and controls, refrigerant characteristics, piping materials and pressure testing, compressors, condensers, evaporators, receivers, accumulators, expansion devices, dryers, system troubleshooting, installation, maintenance, and repair.

Because the examination is open book, preparation should include regular use of the approved references. Candidates should learn how each book is organized and practice locating code provisions, electrical information, refrigeration concepts, component information, and safety requirements efficiently before test day.

This exam book package provides a strong foundation for candidates who want to prepare directly from the technical resources associated with the Oklahoma Refrigeration Contractor examination. Combining trade knowledge with repeated reference navigation can help create a more organized and purposeful study routine.

Exam Details

The Oklahoma Refrigeration Contractor examination tests a candidate's knowledge of the operation, installation, maintenance, repair, fabrication, alteration, or extension of refrigeration systems. The examination includes electrical components, piping, refrigerants, refrigeration components, system operations, and safety.

The examination contains 80 questions. Candidates are allowed 210 minutes to complete the test. The required passing score is 70%, which corresponds to 56 correct answers.

The examination is divided into six major content areas:

• Electrical Knowledge and Controls: 20 questions
• Refrigerants: 10 questions
• Piping: 5 questions
• Refrigeration Equipment and Components: 20 questions
• Refrigeration Systems Operations: 20 questions
• Safety: 5 questions

Electrical Knowledge and Controls is a major portion of the examination. Candidates should review general electrical theory and knowledge, motors, AC and DC circuits, meters, controls, and relays. Refrigeration contractors frequently work with electrically operated equipment and control systems, making electrical troubleshooting an important part of the trade.

Refrigerants account for 10 questions and include refrigerant types, refrigerant systems, and refrigerant theory. Candidates should understand how refrigerants behave within refrigeration systems and how system conditions affect performance.

Piping includes piping supports, piping materials and sizes, and piping pressure tests. Candidates should understand how refrigeration piping is installed, supported, selected, and tested as part of a complete system.

Refrigeration Equipment and Components accounts for 20 questions. This section includes valves, compressors, condensers, evaporators, receivers, accumulators, expansion devices, and dryers. Candidates should understand the purpose of each component and how the components interact during the refrigeration cycle.

Refrigeration Systems Operations also accounts for 20 questions and covers system troubleshooting, system operation, installation, maintenance, and repair. This area requires candidates to apply technical knowledge to the operation and servicing of refrigeration equipment.

The Safety portion includes construction and workplace safety topics applicable to refrigeration work. Candidates should be prepared to recognize appropriate safety practices when working around equipment, electrical systems, refrigerants, tools, ladders, and potentially hazardous working conditions.

Open Book Test

The Oklahoma Refrigeration Contractor examination is an open-book test. Candidates may use approved reference materials during the examination according to the testing provider's rules.

The International Mechanical Code, 2018 with applicable Oklahoma revisions is an approved code reference for the examination. Code questions are based on the listed code edition.

Modern Refrigeration and Air Conditioning, 22nd Edition is currently permitted as an examination reference. This technical textbook provides extensive coverage of refrigeration theory, equipment, electrical controls, system installation, service, troubleshooting, and related HVAC/R subjects.

The applicable Code of Federal Regulations - 29 CFR Part 1926 construction safety material is also permitted for examination use and supports preparation for safety-related questions.

Approved reference materials may be highlighted, underlined, and indexed before the examination session. Permanent tabs may be used to organize approved books. Temporary tabs such as Post-it notes are not permitted.

The open-book format does not replace technical preparation. Candidates have 210 minutes for 80 questions, giving an average of approximately two minutes and thirty-seven seconds per question. Searching through unfamiliar references for every answer can quickly consume available time.

Practice identifying the subject of a question before opening a reference. A mechanical-code question may lead to the International Mechanical Code, while a refrigeration-theory or component question may be addressed in Modern Refrigeration and Air Conditioning. Construction safety questions may require the OSHA reference.

Learning which book is most useful for each subject can make open-book preparation more efficient.

Licensing Steps

1. Gain qualifying mechanical trade experience. Oklahoma mechanical contractor applicants must satisfy the applicable experience requirements for contractor licensing.
2. Meet journeyman-level qualifications. Contractor applicants must meet the qualification requirements applicable to an Oklahoma mechanical journeyman.
3. Complete additional contractor experience. Oklahoma requires an additional year of qualifying mechanical trade experience for contractor-level licensing.
4. Apply for the Refrigeration Contractor classification. Mechanical licensing is administered through the Oklahoma Construction Industries Board.
5. Receive examination eligibility. Applicants must be approved before scheduling the required contractor examinations.
6. Prepare for the Refrigeration Contractor examination. Study refrigeration systems, electrical controls, refrigerants, piping, components, troubleshooting, maintenance, repair, safety, and reference navigation.
7. Complete the applicable contractor examinations. Contractor candidates must satisfy the technical and Business and Law examination requirements applicable to Oklahoma mechanical contractor licensing.
8. Complete active contractor requirements. After satisfying the examination requirements, contractors must meet applicable Oklahoma bond, insurance, and licensing requirements for active contractor status.

State Requirements

Oklahoma mechanical contractor licensing is administered through the Oklahoma Construction Industries Board. The Refrigeration Contractor classification allows the license holder to install, alter, modify, service, maintain, or repair refrigeration products, systems, or equipment, including process piping associated with refrigeration work.

Applicants for an Oklahoma mechanical contractor license must meet the same qualification requirements applicable to a mechanical journeyman and complete an additional one year of experience in the mechanical trade.

Mechanical contractors must have the required relationship with the mechanical firm connected to the contractor license. Oklahoma requires a mechanical contractor to be a permanent employee, owner, partner, or officer of the mechanical firm.

Passing the applicable examinations is one part of obtaining contractor status. Oklahoma also establishes requirements for maintaining an active mechanical contractor license, including applicable bond and commercial general liability insurance requirements.

Mechanical contractors are responsible for maintaining required insurance coverage and complying with Oklahoma mechanical licensing laws and regulations. Contractors must also follow applicable requirements involving apprentices, license display, supervision, and regulated mechanical work.

Mechanical journeymen and contractors are subject to continuing education requirements established by Oklahoma. Maintaining licensing compliance is an ongoing responsibility after the initial examination and licensing process has been completed.

Reference Books

• International Mechanical Code, 2018
  The 2018 International Mechanical Code is an approved code reference for the Oklahoma Refrigeration Contractor examination. It contains requirements affecting mechanical systems, refrigeration equipment, installation, ventilation, piping, equipment location, safety, and other mechanical system provisions. Candidates should become comfortable navigating the code and locating applicable chapters, definitions, and requirements.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  This comprehensive refrigeration and air-conditioning reference covers refrigeration principles, electrical fundamentals, controls, motors, refrigerants, compressors, condensers, evaporators, metering devices, piping, system operation, troubleshooting, installation, maintenance, and repair. The 22nd Edition is permitted for the Oklahoma Refrigeration Contractor examination.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  This federal construction safety reference contains OSHA standards applicable to construction work. It supports preparation for safety topics involving employee protection, ventilation, first aid, personal protective equipment, hazardous materials, lockout/tagout procedures, ladders, and other workplace safety requirements.

These books should be used throughout preparation instead of being opened for the first time shortly before the examination. Repeated use can help candidates become more familiar with how information is organized and which reference is most useful for a particular question.

Test Information and Study Materials

A strong Oklahoma Refrigeration Contractor study plan should be organized around the six major examination categories. Candidates should spend additional time on the larger sections while still preparing across the entire content outline.

Electrical Knowledge and Controls accounts for 20 questions and should receive substantial preparation. Review electrical theory, voltage, current, resistance, motors, AC and DC circuits, meters, controls, and relays. Refrigeration troubleshooting often requires technicians to determine whether a system problem is electrical, mechanical, or related to refrigeration-system operation.

Practice understanding control sequences rather than simply memorizing individual components. Learn how thermostats, relays, contactors, motors, and other control devices work together to start, stop, regulate, and protect refrigeration equipment.

Refrigerants should be studied with attention to refrigerant types, refrigerant theory, and how refrigerants operate within complete systems. Understanding pressure and temperature relationships can help candidates evaluate system behavior and recognize abnormal operating conditions.

Piping should include piping supports, material selection, pipe sizing, and pressure testing. Candidates should understand how refrigeration piping affects system performance and why proper installation and testing are important.

Refrigeration Equipment and Components is another 20-question category. Study compressors, condensers, evaporators, valves, receivers, accumulators, expansion devices, and dryers individually, then review how each component functions as part of the complete refrigeration cycle.

For compressors, understand their function within the refrigeration cycle and how operating problems can affect system performance. Review common compressor-related concepts and troubleshooting considerations.

For condensers and evaporators, study heat transfer and the role each component plays in changing the condition of the refrigerant. Understanding refrigeration theory can make component questions easier to interpret.

Review expansion devices and their role in controlling refrigerant flow. Candidates should also understand the purpose of receivers, accumulators, dryers, and common refrigeration valves.

Refrigeration Systems Operations accounts for another 20 questions and deserves significant study time. This area includes troubleshooting, system operation, installation, maintenance, and repair.

Troubleshooting preparation should focus on understanding symptoms and system relationships. Instead of memorizing isolated problems, practice thinking through how pressure, temperature, airflow, refrigerant conditions, electrical controls, and equipment components interact.

System installation and maintenance should also be reviewed carefully. Candidates should understand why proper installation procedures affect system reliability, efficiency, and service life.

Safety preparation should include the OSHA construction requirements relevant to refrigeration work. Review safety training, ventilation, first aid, personal protective equipment, hazardous materials, lockout/tagout procedures, and ladder safety.

Timed practice is useful because the exam includes 80 questions with 210 minutes available. Candidates should practice answering familiar questions efficiently and reserving additional time for technical calculations, troubleshooting questions, and reference lookups.

Reference navigation should be incorporated into practice sessions. Select a subject, identify which book is likely to contain the answer, and locate the applicable information. This process can help candidates become faster at moving between the International Mechanical Code, Modern Refrigeration and Air Conditioning, and OSHA material.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep supports Oklahoma Refrigeration Contractor candidates through organized study guidance, refrigeration trade-focused review, practice-oriented preparation, reference navigation, and a structured approach to contractor exam preparation.

This exam book package gives candidates access to technical references covering mechanical code requirements, refrigeration theory and components, electrical controls, system troubleshooting, and construction safety. Working directly from the references can help candidates connect trade knowledge with the material available during the open-book examination.

1 Exam Prep encourages candidates to divide preparation into manageable categories. Electrical controls, refrigerants, piping, equipment, system operations, and safety can each be studied separately before being combined into broader practice sessions.

Practice-oriented preparation can help candidates identify weaker areas. Someone who understands refrigeration theory but needs more work with electrical controls can devote additional time to circuits, motors, meters, relays, and control systems. Candidates who struggle with troubleshooting can spend more time reviewing system operation and diagnostic principles.

Reference navigation is also an important part of preparation. Candidates should learn where mechanical code requirements are located, how Modern Refrigeration and Air Conditioning is organized, and where important OSHA safety topics can be found.

A structured study routine can help candidates approach a broad 80-question contractor examination more systematically. The goal is to strengthen technical knowledge, improve familiarity with refrigeration systems, build efficient reference-navigation habits, and develop confidence through repeated preparation.

1 Exam Prep provides a focused framework for candidates working toward the Oklahoma Refrigeration Contractor examination without making guarantees about passing or licensing outcomes.

Frequently Asked Questions

What books are included in the Oklahoma Refrigeration Contractor Exam Book Package?

The package includes the International Mechanical Code, 2018; Modern Refrigeration and Air Conditioning, 22nd Edition; and Code of Federal Regulations - 29 CFR Part 1926 covering OSHA construction standards.

Is the Oklahoma Refrigeration Contractor exam open book?

Yes. The Oklahoma Refrigeration Contractor examination is an open-book test using approved reference materials.

How many questions are on the exam?

The Oklahoma Refrigeration Contractor examination contains 80 questions.

How much time is allowed for the exam?

Candidates are allowed 210 minutes to complete the examination.

What score is required to pass?

The required passing score is 70%, which corresponds to 56 correct answers.

What are the largest sections of the exam?

Electrical Knowledge and Controls, Refrigeration Equipment and Components, and Refrigeration Systems Operations each contain 20 questions and together make up the majority of the examination.

What refrigeration components should I study?

Study valves, compressors, condensers, evaporators, receivers, accumulators, expansion devices, and dryers, along with how these components operate together within a refrigeration system.

Does the exam include electrical questions?

Yes. Electrical Knowledge and Controls accounts for 20 questions and includes electrical theory, motors, AC and DC circuits, meters, controls, and relays.

Is Modern Refrigeration and Air Conditioning, 22nd Edition allowed for the exam?

Yes. The 22nd Edition is currently permitted as a reference for the Oklahoma Refrigeration Contractor examination.

Why is OSHA 29 CFR Part 1926 included?

The examination includes workplace and construction safety topics, and 29 CFR Part 1926 contains OSHA requirements relevant to construction and mechanical work.

What does an Oklahoma Refrigeration Contractor license cover?

The classification allows the license holder to install, alter, modify, service, maintain, or repair refrigeration products, systems, or equipment, including associated process piping.

How should I use these books while studying?

Use the references alongside practice-oriented study. Become familiar with where code requirements, electrical information, refrigeration theory, component information, troubleshooting material, and safety requirements are located so reference navigation becomes more efficient.