Connecticut Unlimited Heating, Piping and Cooling Contractor (S-1) Books Allowed into Exam Package

Prepare for the Connecticut Unlimited Heating, Piping and Cooling Contractor (S-1) examination with a focused package containing the approved references and tools used during open-book testing. This collection brings together commercial load-calculation guidance, mechanical-code requirements, oil-burning standards, natural-gas provisions, 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-1 examination covers a broad range of heating, piping, cooling, refrigeration, fuel-gas, oil-burning, hydronic, boiler, ductwork, ventilation, load-calculation, and safety subjects. Candidates must combine practical contractor-level knowledge with the ability to locate technical information efficiently in several different references.

This package includes Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition; International Mechanical Code, 2021; NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011; NFPA 54 - National Fuel Gas Code Handbook, 2012; 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 portion of the examination. Manual N addresses qualifying small-commercial heating and cooling load calculations. The International Mechanical Code supports mechanical-system, equipment, ventilation, combustion-air, piping, duct, chimney, vent, boiler, and refrigeration requirements. NFPA 31 addresses oil-burning equipment, while NFPA 54 and NFPA 58 cover natural-gas and LP gas systems.

NFPA 56 supports preparation involving cleaning and purging procedures for flammable gas piping. OSHA 29 CFR Part 1926 addresses construction-site safety. Modern Refrigeration and Air Conditioning supports technical review involving refrigeration, heating, cooling, hydronics, equipment, controls, maintenance, and troubleshooting. HVAC Duct Construction Standards and the Ductulator support duct construction and sizing preparation.

The S-1 examination is open book, but the number of references makes organized preparation especially important. Candidates should learn which book applies to each subject, where major chapters and tables are located, and which index terms produce useful results. Opening the wrong book or searching page by page can use valuable examination time.

Studying with the books allowed into the examination helps candidates build a repeatable process. A candidate can identify the primary subject, select the most likely reference, locate the supporting provision or table, read the complete section, and then evaluate the available answers.

This product contains the listed S-1 trade examination references and tools. It does not include highlighting and tabbing services, online course access, book rental, Application Service, a refundable deposit, the separate Connecticut contractor Business and Law book, or supplemental hydronic, oil-burner, and steam-plant study books.

What You Get

Exam Details

The Connecticut Unlimited Heating, Piping and Cooling Contractor (S-1) trade examination contains 80 questions. Candidates are allowed three hours to complete the examination, and a minimum score of 70 percent is required to pass.

The S-1 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: 3 questions
• Refrigerants and Refrigeration: 5 questions
• Testing, Adjusting and Balancing: 3 questions
• 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: 5 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
• Load Calculations: 7 questions
• Boilers: 3 questions

Fuel-gas systems are the largest examination category, accounting for 10 questions. Candidates should understand gas-piping materials, system demand, sizing, regulators, appliance connections, pressure, testing, combustion air, venting, purging, and related safety requirements.

Gas-pipe sizing preparation should include the longest-length method. Candidates should practice determining the longest measured run, identifying the applicable table, calculating or identifying connected demand, and using the selected length consistently throughout the system-sizing process.

Load calculations account for seven questions. Manual N supports preparation involving heating and cooling loads for qualifying small-commercial buildings. Candidates should understand design conditions, heat gain, heat loss, building construction, infiltration, ventilation, internal loads, solar effects, and equipment-sizing inputs.

Hydronics, ducts, and oil burners each account for six questions. Hydronic preparation should include boilers, pumps, circulators, expansion control, piping arrangements, heat emitters, controls, and system operation. Duct preparation should include airflow, sizing, friction rate, velocity, materials, fittings, reinforcement, sealing, and supports.

Oil-burner preparation should include burner components, fuel delivery, tanks, piping, ignition, combustion, draft, controls, venting, testing, service, and troubleshooting. NFPA 31 provides the installation standard used for many oil-burning questions.

With 180 minutes available for 80 questions, candidates have an average of approximately two minutes and fifteen seconds per question. This time includes reading the question, identifying the subject, selecting the correct reference, locating the supporting information, and choosing an answer.

S-1 contractor candidates must also complete the applicable Connecticut contractor Business and Law examination. The separate Business and Law reference is not included in this trade-books package.

Open Book Test

The Connecticut S-1 Unlimited Heating, Piping and Cooling Contractor 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 S-1 trade examination use. Candidates are responsible for bringing the applicable materials to the testing center because a complete personal reference set is not provided to each examinee.

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

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

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 primary subject. Mechanical equipment, refrigeration machinery rooms, ventilation, combustion air, ducts, chimneys, vents, boilers, or piping questions may lead to the International Mechanical Code.

Small-commercial heating and cooling load-calculation questions may require Manual N. Natural-gas piping, sizing, appliance installation, pressure regulation, testing, combustion-air, and venting questions may lead to NFPA 54.

Oil-burning equipment, tanks, fuel-oil piping, controls, combustion air, and venting questions may require NFPA 31. LP gas container, regulator, storage, piping, and equipment questions may lead to NFPA 58.

Questions involving cleaning or purging flammable gas piping may require NFPA 56. Construction-safety questions may lead to OSHA 29 CFR Part 1926. Refrigeration, heating, cooling, equipment, controls, hydronics, 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 practice recognizing whether a question concerns duct design calculations or physical construction requirements before choosing a source.

Licensing Steps

1. Review the S-1 license scope. Confirm that the Connecticut Unlimited Heating, Piping and Cooling Contractor classification matches the services you intend to provide.
2. Document the qualifying pathway. Gather records showing the applicable education, supervised on-the-job training, occupational license history, and contractor-level experience.
3. Complete the contractor application. Submit the applicable S-1 application and supporting documentation to the Connecticut Department of Consumer Protection.
4. Receive examination eligibility. Connecticut reviews the applicant’s qualifications and determines whether the candidate may proceed to testing.
5. Prepare for the trade examination. Study the approved S-1 references, review the examination outline, and practice calculations and reference navigation.
6. Prepare for Business and Law. Obtain the separate Connecticut contractor Business and Law reference and prepare for the required contractor examination.
7. Practice open-book research. Learn which book applies to each subject and practice locating provisions, definitions, diagrams, formulas, and technical tables under timed conditions.
8. Schedule the required examinations. Follow the testing provider’s registration and scheduling procedures after eligibility is granted.
9. Complete the examinations. Pass the S-1 trade examination and the applicable Connecticut contractor Business and Law examination.
10. Complete license issuance. Submit passing results and any remaining documentation or licensing fees required by Connecticut.

Passing the required examinations does not automatically issue the S-1 license. Applicants must complete Connecticut’s qualification, application, examination, documentation, and license-issuance requirements.

State Requirements

The Connecticut S-1 credential is the Unlimited Heating, Piping and Cooling Contractor license. The holder may perform all heating, piping, and cooling work defined within the authority of the credential.

The S-1 classification is broader than Connecticut’s limited heating, cooling, refrigeration, oil-burner, and fuel-gas licenses. It covers a wide range of regulated systems, equipment, piping, controls, heating, refrigeration, air-conditioning, and related work.

The S-1 credential does not automatically replace unrelated occupational licenses. Electrical, plumbing, fire-protection, and other separately regulated work may require additional licensing when it falls outside the authorized heating, piping, and cooling scope.

Applicants must qualify through an accepted Connecticut contractor licensing pathway and provide the supporting documentation required for that route. Records may include classroom education, supervised training, occupational license history, employment verification, and contractor-level experience.

The occupational contractor license is issued to an individual. A company, LLC, corporation, or other business entity is separate from the individual S-1 credential and may have additional registration, insurance, tax, and operational responsibilities.

Connecticut contractor candidates must complete the applicable trade examination and the contractor Business and Law examination. Passing both examinations does not remove the requirement to satisfy all application, qualification, documentation, and license-issuance requirements.

Reference Books

• Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  This approved exam-room reference supports heating and cooling load calculations for qualifying small-commercial buildings, including design conditions, heat gain, heat loss, internal loads, ventilation, and equipment-sizing inputs.
• International Mechanical Code, 2021
  This approved code covers mechanical equipment, refrigeration systems, machinery rooms, ventilation, combustion air, ducts, chimneys, vents, boilers, piping, and related installation requirements.
• 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.
• 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.
• 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, equipment, controls, maintenance, testing, and troubleshooting preparation.
• 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 materials are included and approved for applicable use during the Connecticut S-1 trade examination:

• Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  Use this reference for small-commercial heating and cooling load-calculation questions.
• International Mechanical Code, 2021
  Use this code for mechanical equipment, refrigeration systems, ventilation, combustion air, ducts, chimneys, vents, boilers, and piping.
• NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011
  Use this standard for oil-burning equipment, tanks, piping, controls, combustion air, and venting requirements.
• NFPA 54 - National Fuel Gas Code Handbook, 2012
  Use this reference for natural-gas piping, sizing, appliances, regulators, combustion air, venting, and testing.
• 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, equipment, controls, 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 support requirements.
• 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.

This package is limited to the books and tools allowed into the S-1 trade examination. Supplemental hydronic heating, residential oil-burner, and steam-plant books are not included.

Test Information and Study Materials

A productive S-1 study plan should begin with fuel-gas systems, load calculations, hydronics, ducts, oil burners, refrigeration, and venting because these subjects represent a substantial portion of the examination.

Practice natural-gas sizing with NFPA 54 and become comfortable locating the correct tables. Review cleaning and purging procedures in NFPA 56, including planning, monitoring, ignition-source control, and safe discharge considerations.

Use Manual N to practice small-commercial heating and cooling load calculations. Focus on design temperatures, heat gain, heat loss, ventilation, infiltration, internal loads, building construction, and equipment-sizing inputs.

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, piping, storage, separation, and equipment requirements.

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

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

How 1 Exam Prep Helps You Reach Your Goal

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

Trade-focused review helps candidates connect each subject with the correct source. 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 calculations, locate technical tables, interpret diagrams, and research missed questions. This process strengthens both trade knowledge and familiarity with the approved references.

Reference-navigation practice is especially important for an examination using several books. Candidates can learn to identify the subject quickly, choose the correct reference, locate an effective index term, and read the complete supporting provision within the available time.

A structured study approach also helps candidates identify weaker categories. Additional preparation can be directed toward fuel gas, load calculations, hydronics, oil burners, ducts, refrigeration, 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 required examinations, and completing the licensing process.

FAQ Section

What is included in this S-1 package?

The package includes ten references and tools approved for use during the Connecticut S-1 trade examination.

Are all included books allowed into the S-1 examination?

Yes. The listed references and Ductulator are included specifically for applicable open-book S-1 trade examination use.

Is the Connecticut S-1 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-1 examination?

The S-1 trade examination contains 80 questions. Candidates have three hours to complete the test and must earn a minimum score of 70 percent.

What is the largest S-1 examination category?

Fuel-gas systems are the largest category with 10 questions. Load calculations follow with seven questions.

Is NFPA 56 included?

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

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 approved S-1 trade exam-room references and tools listed above.

Does this package include online course access?

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

Does this package include the Business and Law book?

No. The separate Connecticut contractor Business and Law reference is not included in this S-1 trade examination package.

Does purchasing this package guarantee an S-1 license?

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