Nevada Chilled and Hot Water Systems Contractor (C-21F) Exam Book Package

Prepare for the Nevada Chilled and Hot Water Systems Contractor (C-21F) trade examination with an exam book package built around the code references and technical study materials associated with chilled-water and hot-water systems. This package combines the books permitted for use during the C-21F examination with additional study references that support refrigeration, air-conditioning, boiler, piping, equipment, controls, and safety knowledge.

The Nevada C-21F Chilled and Hot Water Systems subclassification is part of the Nevada C-21 Refrigeration and Air-Conditioning classification. The authorized scope includes the installation of boilers, chillers, coils, cooling towers, piping, pumps, storage tanks, valves, and other equipment used in the production and transfer of water for temperature control.

The exam-room-approved references included with this package are the Uniform Mechanical Code, 2018, Uniform Plumbing Code, 2018, and Code of Federal Regulations - 29 CFR Part 1926 (OSHA). Candidates should become familiar with these references before exam day because the Nevada C-21F examination is open book.

The package also includes Modern Refrigeration and Air Conditioning, 22nd edition and Low Pressure Boilers, 5th Edition. These are study materials and are not allowed into the C-21F trade examination. Candidates should use them before test day to strengthen their understanding of equipment, system operation, refrigeration concepts, boilers, controls, and troubleshooting principles.

Successful C-21F preparation requires more than simply owning the books. Candidates should understand chilled-water and hot-water system components, piping arrangements, valves, pumps, heat-transfer equipment, boilers, chillers, cooling towers, controls, and safety practices while also developing the ability to locate applicable code provisions efficiently.

Exam Details

The Nevada C-21F Chilled and Hot Water Systems trade examination is administered through PSI for candidates authorized to test through the Nevada State Contractors Board.

• Exam: Nevada C-21F Chilled and Hot Water Systems
• Testing Provider: PSI
• Number of Questions: 50
• Time Allowed: 2 hours
• Minimum Passing Score: 35 correct answers

The examination content is divided into the following subject areas:

• Piping: 15 questions
• Water Cooling Equipment: 10 questions
• Water Heating Equipment: 10 questions
• Valves and Controls: 8 questions
• Safety: 7 questions

Piping is the largest individual section of the examination. Candidates should review piping materials, joining methods, system layouts, supports, valves, fittings, circulation, expansion, insulation relationships, equipment connections, and code requirements that apply to chilled-water and hot-water systems.

Water Cooling Equipment includes equipment and principles associated with the production and transfer of chilled water. Candidates should understand chillers, coils, cooling towers, pumps, heat-transfer relationships, circulation, equipment components, and common system arrangements.

Water Heating Equipment requires knowledge of equipment used to generate and distribute heated water. Preparation should include boilers, circulation equipment, storage tanks, pumps, piping, controls, and related mechanical-system principles.

Valves and Controls focuses on the components used to regulate system flow, temperature, pressure, and equipment operation. Candidates should understand the purpose and application of valves, control devices, pumps, and related components in chilled-water and hot-water systems.

Safety represents seven questions. Candidates should study jobsite hazards, personal protective equipment, ladders, tools, material handling, hot-work considerations, equipment safety, and other construction practices relevant to mechanical-system installation.

Open Book Test

The Nevada C-21F Chilled and Hot Water Systems examination is an open-book test. The exam-room-approved references included in this package are:

• Uniform Mechanical Code, 2018
• Uniform Plumbing Code, 2018
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)

Candidates should practice using these books throughout preparation instead of waiting until the final days before the examination. Open-book testing rewards candidates who know the structure of their references and can quickly identify which book is most likely to contain the required information.

The Uniform Mechanical Code supports study involving mechanical systems, equipment, ventilation relationships, hydronic systems, mechanical piping, appliances, and other requirements connected with the C-21F scope.

The Uniform Plumbing Code supports piping-related preparation and code navigation involving water systems, materials, fittings, installation requirements, and related plumbing provisions that may apply to chilled-water and hot-water work.

OSHA 29 CFR Part 1926 supports construction-safety preparation and is one of the references permitted for the current C-21F examination. Candidates should know how to locate safety requirements efficiently while also understanding common safety principles without relying on a lookup for every question.

The following included study references are not allowed into the C-21F trade examination:

• Modern Refrigeration and Air Conditioning, 22nd edition
• Low Pressure Boilers, 5th Edition

These books should be used to develop technical knowledge before test day. Modern Refrigeration and Air Conditioning can reinforce system components, refrigeration principles, controls, equipment, heat transfer, and troubleshooting concepts. Low Pressure Boilers can support preparation involving boiler construction, operation, controls, accessories, piping relationships, and safety.

Licensing Steps

The Nevada State Contractors Board regulates the C-21F Chilled and Hot Water Systems subclassification. Passing the trade examination is one part of the complete Nevada contractor licensing process.

1. Confirm the C-21F classification. Determine that Chilled and Hot Water Systems matches the contracting work the business intends to perform.
2. Identify the qualifying individual. Designate the individual who will satisfy the applicable technical experience and examination requirements.
3. Document qualifying experience. Prepare records describing relevant work involving chilled-water systems, hot-water systems, boilers, chillers, coils, cooling towers, pumps, piping, valves, storage tanks, and related equipment.
4. Prepare the Nevada contractor license application. Gather business information, qualifier information, experience documentation, financial information, and required supporting materials.
5. Submit the application. The Nevada State Contractors Board reviews the applicant's qualifications before examination eligibility is established.
6. Complete applicable background requirements. Follow required fingerprint, disclosure, and background procedures.
7. Meet financial responsibility requirements. Provide the applicable financial documentation required during the Nevada contractor licensing process.
8. Receive examination eligibility. Candidates who must test can proceed with scheduling after authorization.
9. Schedule the C-21F examination through PSI. Arrange the Chilled and Hot Water Systems trade examination after eligibility has been established.
10. Prepare for the trade examination. Study piping, water cooling equipment, water heating equipment, valves and controls, safety, and code navigation.
11. Prepare for the applicable Nevada management examination. Nevada contractor licensing includes business and law or management qualification in addition to the trade examination.
12. Complete required examinations. Satisfy the applicable trade and management testing requirements unless an authorized waiver applies.
13. Complete remaining licensing requirements. Address applicable bonding, financial responsibility, background, and other Nevada State Contractors Board requirements before license issuance.

State Requirements

The Nevada C-21F Chilled and Hot Water Systems subclassification authorizes the installation of boilers, chillers, coils, cooling towers, piping, pumps, storage tanks, valves, and other equipment used in the production and transfer of water for the control of temperatures.

This scope requires candidates to understand how mechanical components work together as complete hydronic systems. Work may involve the equipment that produces heated or chilled water as well as the piping, pumps, tanks, valves, controls, and related components used to transfer that water through the system.

Candidates should distinguish the C-21F scope from other C-21 subclassifications involving refrigeration, air conditioning, maintenance, solar air conditioning, sheet metal, or industrial piping. The C-21F subclassification specifically centers on chilled-water and hot-water systems used for temperature control.

For the standard Nevada contractor licensing pathway, the qualifying individual generally must document at least four years of qualifying experience within the applicable experience period required by the Nevada State Contractors Board.

Qualifying experience should relate directly to the requested classification. Applicants should maintain organized records describing the equipment installed or serviced, the work performed, responsibilities held, and the period during which the experience was obtained.

Passing the C-21F trade exam does not automatically issue a contractor license. Applicants must also satisfy the applicable management qualification, financial responsibility, bonding, background, and other Nevada State Contractors Board requirements.

Reference Books

• Uniform Mechanical Code, 2018
  Exam-room-approved code reference supporting preparation involving mechanical systems, equipment, hydronic-system requirements, mechanical piping, appliances, and other code provisions relevant to chilled-water and hot-water work.
• Uniform Plumbing Code, 2018
  Exam-room-approved code reference supporting piping-related study, materials, fittings, installation requirements, water-system provisions, and other plumbing-code topics relevant to the C-21F examination.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Exam-room-approved safety reference supporting construction-safety preparation involving personal protective equipment, ladders, tools, material handling, fall hazards, and other jobsite requirements.
• Modern Refrigeration and Air Conditioning, 22nd edition
  Study reference supporting refrigeration, air-conditioning, system components, controls, equipment operation, heat-transfer principles, troubleshooting, and mechanical-system knowledge. This book is not allowed into the C-21F trade examination.
• Low Pressure Boilers, 5th Edition
  Study reference supporting boiler fundamentals, components, operation, controls, accessories, safety, piping relationships, and related hot-water-system concepts. This book is not allowed into the C-21F trade examination.

Exam Room Approved Books

• Uniform Mechanical Code, 2018
  Approved for use during the Nevada C-21F Chilled and Hot Water Systems trade examination.
• Uniform Plumbing Code, 2018
  Approved for use during the Nevada C-21F Chilled and Hot Water Systems trade examination.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Approved for use during the Nevada C-21F Chilled and Hot Water Systems trade examination.

The Modern Refrigeration and Air Conditioning and Low Pressure Boilers books are study references and should be used before exam day to strengthen trade knowledge. Candidates should be prepared to answer questions based on those technical subjects without having those books available during the examination.

Test Information and Study Materials

A strong C-21F study plan should begin with the examination weighting. Piping represents 15 of the 50 questions, while Water Cooling Equipment and Water Heating Equipment each account for 10. Together, these three subjects make up most of the examination.

Prioritize piping. Review materials, fittings, joining methods, system layouts, supports, flow relationships, circulation, equipment connections, expansion considerations, valves, and applicable mechanical and plumbing-code provisions.

Study water cooling equipment. Review chillers, cooling towers, coils, pumps, storage systems, heat transfer, circulation, operating relationships, and equipment components used in chilled-water systems.

Study water heating equipment. Review boilers, pumps, storage tanks, controls, valves, piping, heat-transfer equipment, and system-operation principles associated with heated-water systems.

Review valves and controls. Understand the function of common valves, control devices, pumping equipment, temperature controls, and related components that regulate hydronic-system operation.

Prepare for safety. Use OSHA to review jobsite hazards, protective equipment, ladders, tools, materials, and safe construction practices. Safety represents seven questions and should be treated as a significant exam category.

Practice code navigation. Work directly with the Uniform Mechanical Code, Uniform Plumbing Code, and OSHA reference during study. Learn which reference applies to different types of questions so you do not waste time searching the wrong book.

Use the study-only books for technical depth. Modern Refrigeration and Air Conditioning and Low Pressure Boilers can help reinforce equipment operation and system concepts that go beyond direct code questions.

Use timed practice. Candidates have two hours for 50 questions. Timed exercises can help develop a realistic pace and improve decisions about when a reference lookup is necessary.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep supports Nevada C-21F Chilled and Hot Water Systems Contractor candidates through organized study guidance, trade-focused review, practice-oriented preparation, reference navigation, and confidence-building study structure.

The C-21F examination combines piping, mechanical equipment, heating equipment, cooling equipment, valves, controls, and safety. Organized preparation helps candidates divide this broad material into manageable subjects instead of trying to study the entire classification at once.

Reference-navigation preparation focuses on learning how to use the Uniform Mechanical Code, Uniform Plumbing Code, and OSHA efficiently. Candidates can practice identifying which reference applies to a question, locating the relevant material, and returning to the problem without losing unnecessary time.

Trade-focused review reinforces the technical knowledge needed for questions that cannot be answered through code navigation alone. Chillers, boilers, cooling towers, pumps, coils, valves, piping systems, storage tanks, and controls all require practical understanding.

Practice-oriented preparation can help candidates identify weaker areas. A candidate with extensive piping experience may need additional review of boilers or cooling equipment, while another may need more work with controls, safety, or code navigation.

By combining approved exam-room references with refrigeration and boiler study materials, structured review, and reference-navigation practice, 1 Exam Prep helps candidates build an organized preparation strategy for the Nevada C-21F Chilled and Hot Water Systems Contractor examination.

Frequently Asked Questions

What books are included in the Nevada C-21F Exam Book Package?

The package includes the Uniform Mechanical Code, 2018; Uniform Plumbing Code, 2018; OSHA 29 CFR Part 1926; Modern Refrigeration and Air Conditioning, 22nd edition; and Low Pressure Boilers, 5th Edition.

Is the Nevada C-21F examination open book?

Yes. The Nevada C-21F Chilled and Hot Water Systems trade examination is open book with the approved references.

Which books are allowed into the C-21F exam?

The Uniform Mechanical Code, 2018; Uniform Plumbing Code, 2018; and OSHA 29 CFR Part 1926 are the exam-room-approved references included in this package.

Which included books are not allowed into the exam?

Modern Refrigeration and Air Conditioning, 22nd edition and Low Pressure Boilers, 5th Edition are study references and are not allowed into the C-21F trade examination.

How many questions are on the Nevada C-21F exam?

The examination contains 50 questions.

How much time is allowed for the C-21F examination?

Candidates have two hours to complete the examination.

What score is required to pass?

The minimum passing score is 35 correct answers out of 50 questions.

What is the largest exam category?

Piping is the largest individual category with 15 questions.

What equipment should I understand for the C-21F exam?

Preparation should include boilers, chillers, coils, cooling towers, pumps, storage tanks, valves, controls, piping systems, and other equipment associated with producing and transferring water for temperature control.

Why should I practice using the code books before test day?

Regular navigation practice helps candidates identify the correct reference and locate applicable requirements more efficiently during the timed open-book examination.

What does the Nevada C-21F classification cover?

The C-21F classification covers installation of boilers, chillers, coils, cooling towers, piping, pumps, storage tanks, valves, and other equipment used in the production and transfer of water for temperature control.

Does passing the C-21F examination automatically issue a Nevada contractor license?

No. Passing the trade exam is one part of the licensing process. Applicants must also satisfy applicable experience, management, financial responsibility, bonding, background, and other Nevada State Contractors Board requirements.

Who is this package best for?

This package is designed for candidates preparing for the Nevada C-21F Chilled and Hot Water Systems trade examination who want both the approved exam-room references and technical study books covering refrigeration and boiler concepts.