Connecticut Unlimited Heating, Piping and Cooling Journeyperson (S-2) Books Allowed into Exam Package

Prepare for the Connecticut Unlimited Heating, Piping and Cooling Journeyperson (S-2) examination with a focused package containing the approved references and tools used during open-book testing. This collection brings together mechanical-code requirements, natural-gas provisions, oil-burning standards, construction-safety regulations, refrigeration and air-conditioning material, duct-sizing tools, duct-construction standards, liquefied petroleum gas requirements, and flammable-gas piping safety.

The Connecticut S-2 examination covers an extensive range of heating, piping, cooling, refrigeration, fuel-gas, oil-burning, hydronic, boiler, ductwork, ventilation, and safety subjects. Candidates must combine practical journeyperson-level trade knowledge with the ability to identify the correct reference and locate technical information within a limited testing period.

This package includes the International Mechanical Code, 2021; NFPA 54 - National Fuel Gas Code Handbook, 2012; NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011; Code of Federal Regulations - 29 CFR Part 1926 (OSHA); Modern Refrigeration and Air Conditioning, 22nd Edition; a Ductulator; HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition; NFPA 58 - Liquefied Petroleum Gas Code, 2014; and NFPA 56: Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping, 2023.

Each reference supports a different part of the S-2 examination. The International Mechanical Code addresses equipment, machinery rooms, ventilation, combustion air, piping, ducts, boilers, chimneys, flues, vents, and related mechanical requirements. NFPA 54 supports preparation involving natural-gas systems, while NFPA 31 covers oil-burning equipment and NFPA 58 addresses liquefied petroleum gas.

NFPA 56 supports questions involving cleaning and purging flammable gas piping. OSHA 29 CFR Part 1926 addresses construction-site safety. Modern Refrigeration and Air Conditioning reinforces technical knowledge involving refrigeration, hydronics, heating, cooling, controls, equipment operation, maintenance, and troubleshooting.

The HVAC Duct Construction Standards reference addresses duct materials, fittings, reinforcement, fabrication, sealing, and supports. The Ductulator provides a practical tool for reviewing airflow, velocity, friction rate, and duct sizing.

Because the S-2 examination is open book, candidates should use these references throughout preparation. The number of books makes it especially important to recognize the primary subject of each question before beginning a search. Opening the wrong reference or searching page by page can consume valuable examination time.

This product contains the listed books and tool allowed into the S-2 trade examination. It does not include supplemental hydronic, oil-burner, or steam-plant study books, highlighting and tabbing services, online course access, book rental, Application Service, or a refundable deposit.

What You Get

Exam Details

The Connecticut Unlimited Heating, Piping and Cooling Journeyperson (S-2) examination contains 70 questions. Candidates are allowed three hours to complete the examination, and a minimum score of 70 percent is required to pass.

The S-2 examination content outline includes the following subject areas:

• Insulation: 1 question
• Hangers and Supports: 2 questions
• Sound, Vibration and Seismic Control: 1 question
• Heating and Cooling Principles: 4 questions
• Refrigerants and Refrigeration: 5 questions
• Testing, Adjusting and Balancing: 1 question
• Controls: 4 questions
• Machine Room: 1 question
• Air-Conditioning and Heat-Pump Equipment: 3 questions
• Furnaces and Heaters: 4 questions
• Hydronics: 6 questions
• Chimneys, Flues and Vents: 3 questions
• Combustion Air: 2 questions
• Fuel Gas Systems: 10 questions
• Ducts: 6 questions
• Chillers: 2 questions
• Ventilation and Exhaust: 2 questions
• Safety: 4 questions
• Oil Burners: 6 questions
• Boilers: 3 questions

Fuel-gas systems are the largest category, accounting for 10 of the 70 questions. Candidates should understand gas-piping materials, connected demand, sizing procedures, pressure regulation, appliance connections, testing, combustion air, venting, cleaning, purging, and related installation and safety principles.

Gas-pipe sizing questions require use of the longest-length method. Candidates should practice identifying the longest measured run, choosing the applicable sizing table, determining connected demand, and applying the selected length consistently throughout the sizing process.

Hydronics, ducts, and oil burners each account for six questions. Hydronic preparation should include boilers, pumps, circulators, piping arrangements, expansion control, heat emitters, valves, controls, system operation, and maintenance.

Duct preparation should include airflow, friction rate, velocity, sizing, materials, fittings, reinforcement, sealing, supports, and air-distribution performance. Oil-burner preparation should address fuel delivery, burners, tanks, piping, ignition, combustion, draft, controls, venting, service, testing, and troubleshooting.

Refrigerants and refrigeration account for five questions. Candidates should understand the refrigeration cycle, refrigerants, compressors, condensers, evaporators, metering devices, pressure-temperature relationships, system operation, maintenance, and troubleshooting.

Heating and cooling principles, controls, furnaces and heaters, and safety each account for four questions. Candidates should also review heat pumps, chimneys, flues, vents, boilers, combustion air, chillers, ventilation, machinery rooms, insulation, testing, balancing, hangers, supports, sound, vibration, and seismic control.

With 180 minutes available for 70 questions, candidates have an average of approximately two minutes and thirty-four seconds per question. This time includes reading the question, identifying the subject, selecting the correct reference, locating the supporting information, and choosing an answer.

Open Book Test

The Connecticut S-2 Unlimited Heating, Piping and Cooling Journeyperson examination is an open-book test. Candidates may bring approved references and permitted tools into the examination center under the applicable testing rules.

The books and Ductulator included in this package are approved for applicable use during the S-2 examination. Candidates are responsible for bringing their own materials because the testing center does not provide each examinee with a complete personal reference set.

Approved references may be highlighted, underlined, annotated, and indexed before the examination. Permanent tabs may be used to identify chapters, definitions, tables, fuel-gas subjects, oil-burning provisions, refrigeration topics, ductwork, hydronic material, safety requirements, and boiler information.

Temporary tabs, removable notes, loose papers, and inserted pages are not permitted. Candidates may not write in the references during the examination, and examination questions or answers may not be recorded inside the approved books.

This standard package is not identified as highlighted or tabbed. Candidates who plan to add permitted highlighting, annotations, or permanent tabs should complete that preparation before examination day and follow the applicable testing-center rules.

A practical open-book strategy begins by identifying the main subject. Questions involving mechanical equipment, machinery rooms, ventilation, combustion air, piping, ducts, chimneys, vents, boilers, or refrigeration installations may lead to the International Mechanical Code.

Natural-gas piping, appliance installation, regulators, pressure, sizing, testing, combustion-air, and venting questions may lead to NFPA 54. Oil-burning equipment, tanks, fuel-oil piping, controls, combustion, and venting questions may require NFPA 31.

LP gas container, storage, regulator, piping, equipment, and separation questions may require NFPA 58. Questions involving cleaning or purging flammable gas piping may lead to NFPA 56.

Construction-safety questions may require OSHA 29 CFR Part 1926. Refrigeration, air conditioning, hydronics, heating equipment, heat pumps, controls, maintenance, and troubleshooting questions may be supported by Modern Refrigeration and Air Conditioning.

Duct-construction questions may require HVAC Duct Construction Standards, while duct-sizing questions may involve the Ductulator. Candidates should determine whether the question concerns system sizing or physical duct construction before selecting a source.

Licensing Steps

1. Review the S-2 license scope. Confirm that the Connecticut Unlimited Heating, Piping and Cooling Journeyperson classification matches the work you intend to perform.
2. Complete the qualifying pathway. Complete a registered apprenticeship program or an equivalent experience-and-training pathway accepted by Connecticut.
3. Gather supporting records. Prepare apprenticeship documents, classroom records, employment verification, and other materials required for the applicable application route.
4. Complete the journeyperson application. Submit the applicable S-2 application, supporting documentation, and required state fees to the Connecticut Department of Consumer Protection.
5. Receive examination eligibility. Connecticut reviews the applicant’s qualifications and determines whether the candidate may proceed to testing.
6. Prepare for the S-2 examination. Study the approved references, review the content outline, and practice locating provisions, definitions, diagrams, and tables.
7. Practice calculations. Work with gas-pipe sizing, duct sizing, airflow, velocity, friction rate, system demand, and related technical problems.
8. Schedule the examination. Follow the testing provider’s registration and scheduling procedures after receiving eligibility.
9. Complete the S-2 examination. Take the 70-question test within the three-hour examination period.
10. Complete license-issuance requirements. Submit any remaining examination results, documents, or licensing fees required by Connecticut.

Passing the examination does not automatically issue the S-2 license. Applicants must complete Connecticut’s training, application, examination, documentation, and license-issuance requirements.

State Requirements

The Connecticut S-2 credential is an Unlimited Heating, Piping and Cooling Journeyperson license. The holder may perform all heating, piping, and cooling work defined within the authority of the credential.

The S-2 classification is broader than Connecticut’s limited heating, cooling, refrigeration, fuel-gas, and oil-burner journeyperson credentials. It covers an extensive range of heating, piping, air-conditioning, refrigeration, hydronic, boiler, oil, gas, ventilation, and related system work.

The S-2 license does not automatically replace occupational licenses required for unrelated electrical, plumbing, fire-protection, or other separately regulated work. License holders must remain within the legally authorized scope of the credential.

The S-2 credential is a journeyperson license and does not provide independent contracting authority. The holder performs authorized work while employed by or under the supervision of an appropriately licensed contractor.

Applicants generally qualify by completing the applicable registered apprenticeship program or an accepted equivalent experience-and-training pathway. The equivalent-experience pathway identifies 8,000 hours of on-the-job training and 576 classroom hours for the S-2 classification.

Supporting records may be required to establish apprenticeship completion, classroom instruction, supervised employment, or equivalent qualifications. Applicants with out-of-state credentials or training should follow the applicable Connecticut review process.

Candidates should review the license scope carefully before applying. Connecticut offers several unlimited and limited heating, cooling, piping, refrigeration, oil, gas, and related occupational classifications, and the selected license should match the work the applicant intends to perform.

Reference Books

• International Mechanical Code, 2021
  This approved exam-room code covers mechanical equipment, refrigeration systems, machinery rooms, ventilation, combustion air, ducts, chimneys, vents, boilers, piping, and related installation requirements.
• NFPA 54 - National Fuel Gas Code Handbook, 2012
  This approved reference covers natural-gas piping, sizing, pressure regulation, appliance installation, combustion air, venting, testing, and related safety provisions.
• NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011
  This approved standard covers oil-burning equipment, fuel-oil tanks, piping, controls, combustion air, venting, installation, and safety requirements.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  This approved safety reference addresses construction hazards, personal protective equipment, fall protection, ladders, scaffolds, excavation, electrical safety, and jobsite responsibilities.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  This approved technical reference supports refrigeration, air conditioning, heating, hydronics, controls, equipment operation, maintenance, testing, and troubleshooting.
• Ductulator
  This approved tool supports duct sizing, airflow, velocity, friction-rate relationships, and air-distribution calculations.
• HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition
  This approved reference covers duct materials, fabrication, reinforcement, fittings, sealing, supports, and construction requirements.
• NFPA 58 - Liquefied Petroleum Gas Code, 2014
  This approved standard covers LP gas containers, storage, regulators, piping, equipment, installation, separation requirements, and related safety provisions.
• NFPA 56: Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping, 2023
  This approved standard addresses planning, cleaning, purging, monitoring, ignition-source control, and fire and explosion prevention for flammable gas piping systems.

Exam Room Approved Books

The following references and tool are included and approved for applicable use during the Connecticut S-2 trade examination:

• International Mechanical Code, 2021
  Use this code for equipment, refrigeration systems, ventilation, combustion air, ducts, chimneys, vents, boilers, piping, and mechanical installation requirements.
• NFPA 54 - National Fuel Gas Code Handbook, 2012
  Use this reference for natural-gas piping, sizing, appliances, regulators, combustion air, venting, and testing.
• NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011
  Use this standard for oil-burning equipment, fuel-oil tanks, piping, controls, combustion air, and venting.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Use this reference for construction-safety questions and jobsite responsibilities.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  Use this reference for refrigeration, heating, cooling, hydronics, controls, equipment, maintenance, and troubleshooting.
• Ductulator
  Use this tool for duct sizing, airflow, velocity, and friction-rate calculations.
• HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition
  Use this reference for duct fabrication, materials, reinforcement, fittings, sealing, and supports.
• NFPA 58 - Liquefied Petroleum Gas Code, 2014
  Use this standard for LP gas containers, regulators, storage, piping, equipment, installation, and safety.
• NFPA 56: Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping, 2023
  Use this standard for cleaning and purging procedures involving flammable gas piping systems.

This package is limited to the references and tool allowed into the S-2 examination. Supplemental books such as Modern Hydronic Heating, Residential Oil Burners, and Steam Plant Operation are not included.

Test Information and Study Materials

A productive S-2 study plan should begin with fuel-gas systems, hydronics, ducts, oil burners, and refrigeration because these subjects represent a substantial portion of the examination.

Use NFPA 54 to study natural-gas piping, pressure, sizing, regulators, appliances, testing, combustion air, and venting. Practice the longest-length sizing method until the process can be completed accurately under timed conditions.

Use NFPA 56 to review the hazards and procedures associated with cleaning and purging flammable gas piping. Study planning, monitoring, discharge locations, ignition-source control, communication, and safe operating procedures.

Use NFPA 31 to study oil-burning equipment, tanks, fuel-oil piping, controls, combustion air, venting, installation, and safety. Use NFPA 58 for LP gas containers, regulators, storage, piping, equipment, separation, and installation requirements.

Use the Ductulator and HVAC Duct Construction Standards together. The Ductulator supports airflow and sizing calculations, while the construction standard addresses materials, fabrication, fittings, reinforcement, sealing, and supports.

Use Modern Refrigeration and Air Conditioning to strengthen technical knowledge involving refrigeration cycles, hydronics, furnaces, heat pumps, boilers, controls, equipment operation, maintenance, and troubleshooting.

Timed reference practice should include selecting the correct source before beginning the search. Candidates should use indexes, tables of contents, chapter headings, definitions, diagrams, and technical tables to locate the precise supporting information.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Connecticut S-2 candidates prepare with an organized collection of books and tools approved for trade examination use. The package supports study across fuel gas, hydronics, oil burners, refrigeration, boilers, ducts, ventilation, controls, safety, and mechanical requirements.

Trade-focused review helps candidates connect each examination category with the correct reference. Mechanical questions can be researched in the International Mechanical Code, natural-gas questions in NFPA 54, oil-burning questions in NFPA 31, and LP gas questions in NFPA 58.

Practice-oriented preparation helps candidates work through gas-pipe sizing, duct sizing, technical tables, diagrams, and system-operation questions. Missed questions can be researched in the applicable references to strengthen both trade knowledge and open-book navigation skills.

Reference familiarity is especially important for an examination using several sources. Candidates can practice identifying the topic, choosing the correct book, locating an effective index term, and reading the complete supporting section before selecting an answer.

A structured study approach also helps candidates identify weaker categories. Additional preparation can be directed toward fuel gas, hydronics, oil burners, refrigeration, ducts, controls, boilers, safety, or venting based on practice results.

No exam book package can guarantee examination eligibility, a passing score, application approval, or license issuance. Candidates remain responsible for satisfying Connecticut’s qualification requirements, preparing thoroughly, passing the examination, and completing the licensing process.

FAQ Section

What is included in this S-2 package?

The package includes eight approved reference books and standards plus a Ductulator for applicable use during the Connecticut S-2 examination.

Are all included references allowed into the S-2 examination?

Yes. The listed books, standards, and Ductulator are included for applicable open-book S-2 examination use.

Is the Connecticut S-2 examination open book?

Yes. Candidates may bring approved references and permitted tools into the examination center under the applicable testing rules.

How many questions are on the S-2 examination?

The S-2 examination contains 70 questions. Candidates have three hours to complete the test and must earn a minimum score of 70 percent.

What is the largest S-2 examination category?

Fuel-gas systems are the largest category with 10 questions. Hydronics, ducts, and oil burners each account for six questions.

Is NFPA 56 included?

Yes. NFPA 56, 2023 is included for preparation involving cleaning and purging flammable gas piping systems.

Is a Ductulator included?

Yes. A Ductulator is included for duct-sizing, airflow, velocity, and friction-rate preparation.

Are the books highlighted and tabbed?

No highlighting or tabbing service is identified as part of this standard Books Allowed into Exam Package.

Does this package include supplemental study books?

No. This package is limited to the listed references and tool allowed into the S-2 examination room.

Does this package include online course access?

No. This product is a printed examination book package and does not include online course access.

Does the S-2 license allow independent contracting?

No. The S-2 credential is a journeyperson license. The holder performs authorized work while employed by or under the supervision of an appropriately licensed contractor.

Does purchasing this package guarantee an S-2 license?

No. Applicants must meet Connecticut’s qualification requirements, receive examination eligibility, pass the examination, complete the licensing process, and receive state approval.