Connecticut Unlimited Heating, Piping and Cooling Contractor (S-1) Exam Book Package

Prepare for the Connecticut Unlimited Heating, Piping and Cooling Contractor (S-1) examination with a comprehensive collection of approved exam-room references and supplemental study books. This package brings together mechanical code requirements, commercial load calculations, oil-burning standards, natural-gas provisions, construction safety, refrigeration and air-conditioning principles, duct sizing, duct construction, liquefied petroleum gas requirements, flammable-gas piping safety, hydronic heating, residential oil burners, and steam-plant operation.

The Connecticut S-1 license is the state’s unlimited heating, piping, and cooling contractor credential. The examination covers a broad range of technical subjects, including fuel-gas systems, refrigeration, hydronics, oil burners, boilers, load calculations, ducts, controls, ventilation, combustion air, chimneys, flues, vents, and heating and cooling principles.

This exam book package includes the references candidates need to study the major S-1 examination categories and practice open-book navigation. The package contains Manual N; the International Mechanical Code; NFPA 31; NFPA 54; OSHA 29 CFR Part 1926; Modern Refrigeration and Air Conditioning; a Ductulator; HVAC Duct Construction Standards; NFPA 58; and NFPA 56.

The package also includes three supplemental study books: Modern Hydronic Heating for Residential and Light Commercial Buildings by John Siegenthaler, P.E., 2022; Residential Oil Burners, 3rd Edition; and Steam Plant Operation, 10th Edition, 2017. These supplemental books provide additional technical explanations and are intended for preparation outside the examination room.

The approved exam-room references address the formal codes, standards, calculations, safety rules, and technical material used for the S-1 examination. The supplemental books help candidates strengthen their understanding of hydronic systems, oil-burner operation, boilers, steam systems, controls, circulation, piping arrangements, combustion, maintenance, and plant operation.

Because the S-1 examination is open book, candidates should become familiar with each approved reference before test day. A large reference collection can be valuable only when the candidate knows which book applies to a question, where major subjects are located, and how to use indexes, tables, definitions, diagrams, and chapter headings efficiently.

This product is a standard exam book package. It does not include highlighting and tabbing services, online course access, book rental, Application Service, a refundable deposit, or business-formation services.

Exam Details

The Connecticut Unlimited Heating, Piping and Cooling Contractor (S-1) 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 category, accounting for 10 of the 80 questions. Candidates should understand gas-piping materials, system demand, sizing, pressure, regulators, appliance connections, testing, combustion air, venting, purging, and related safety requirements.

Gas-pipe sizing questions require use of the longest-length method. Candidates should practice determining the longest measured run, selecting the correct sizing table, identifying connected demand, and applying the selected length consistently when sizing each section of the system.

Load calculations account for seven questions. Manual N supports preparation involving heating and cooling loads for small commercial buildings. Candidates should understand heat gain, heat loss, design conditions, building construction, internal loads, ventilation, infiltration, 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-transfer equipment, terminal units, valves, and controls. Duct preparation should include sizing, airflow, friction rate, velocity, materials, fittings, reinforcement, sealing, and supports. Oil-burner preparation should include fuel delivery, burner components, controls, combustion, tanks, piping, venting, service, and testing.

Refrigerants and refrigeration and chimneys, flues, and vents each account for five questions. Candidates should also prepare for controls, furnaces and heaters, safety, testing, adjusting and balancing, heating and cooling principles, heat pumps, chillers, boilers, combustion air, ventilation, machinery rooms, insulation, and supports.

With 180 minutes available for 80 questions, candidates have an average of approximately two minutes and fifteen seconds per question. That 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 Business and Law reference is separate and is not included in this S-1 trade exam book 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 approved S-1 exam-room references in this package are Manual N; the International Mechanical Code; NFPA 31; NFPA 54; OSHA 29 CFR Part 1926; Modern Refrigeration and Air Conditioning; the Ductulator; HVAC Duct Construction Standards; NFPA 58; and NFPA 56.

Modern Hydronic Heating, Residential Oil Burners, and Steam Plant Operation are supplemental study books. They may be used to deepen technical understanding during preparation but are not listed as approved S-1 exam-room references.

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, hydronic subjects, oil-burning provisions, refrigeration material, ductwork, 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 approved books.

A practical open-book strategy begins by identifying the subject. Mechanical installation, equipment, ventilation, combustion air, ducts, chimneys, vents, piping, or machinery-room questions may lead to the International Mechanical Code.

Small-commercial load-calculation questions may require Manual N. Natural-gas piping, sizing, appliance, venting, regulator, and combustion-air questions may lead to NFPA 54. Oil-burning equipment, tanks, fuel-oil piping, controls, and venting questions may require NFPA 31.

LP gas questions may lead to NFPA 58. Cleaning and purging questions involving flammable gas piping may require NFPA 56. Construction-safety questions may require OSHA 29 CFR Part 1926.

Technical questions involving refrigeration, heating, air conditioning, controls, equipment, hydronics, maintenance, and troubleshooting 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.

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 classroom 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 S-1 trade examination. Study the approved references, use the supplemental books to reinforce technical concepts, and review the full examination outline.
6. Prepare for Business and Law. Obtain the separate Connecticut contractor Business and Law reference and prepare for the required contractor examination.
7. Practice calculations and navigation. Work with gas-pipe sizing, commercial load calculations, duct sizing, technical tables, code provisions, and timed reference searches.
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 requirements. Submit passing results and any remaining documents 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 an unlimited heating, piping, and cooling contractor license. The holder may perform all heating, piping, and cooling work defined under Connecticut law within the authority of the credential.

The S-1 contractor classification is broader than Connecticut’s limited heating, cooling, refrigeration, fuel-gas, or oil-burner licenses. It covers an extensive range of regulated heating, piping, and cooling work, but it does not replace unrelated occupational licenses that may be required for electrical, plumbing, or other separately regulated services.

Applicants must qualify through an accepted Connecticut contractor licensing pathway. For equivalent experience and education review, the S-1 classification identifies 12,000 hours of on-the-job training and 576 classroom hours.

The contractor-level pathway includes the training associated with the underlying trade and additional qualifying experience beyond journeyperson-level preparation. Applicants must submit the records required for the route under which they apply.

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, tax, insurance, and operational obligations.

Connecticut contractor candidates must complete the applicable trade examination and the contractor Business and Law examination. Passing both tests does not remove the requirement to satisfy all application, experience, 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 heat gain, heat loss, design conditions, internal loads, and equipment-sizing inputs.
• International Mechanical Code, 2021
  This approved code covers mechanical equipment, refrigeration systems, ventilation, combustion air, ducts, chimneys, vents, piping, boilers, 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 covers construction hazards, 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, and troubleshooting.
• Ductulator
  This approved tool supports duct sizing, airflow, velocity, friction rate, 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, separation requirements, installation, and safety.
• 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, and fire and explosion prevention for flammable gas piping systems.
• Modern Hydronic Heating for Residential and Light Commercial Buildings, John Siegenthaler, P.E., 2022
  This supplemental study book provides detailed instruction on boilers, circulators, heat emitters, piping arrangements, hydraulic separation, controls, radiant systems, and modern hydronic design.
• Residential Oil Burners, 3rd Edition
  This supplemental study book covers oil-burner components, fuel delivery, combustion, ignition, controls, adjustment, service, testing, and troubleshooting.
• Steam Plant Operation, 10th Edition, 2017
  This supplemental study reference covers boilers, steam generation, plant systems, water treatment, controls, operation, maintenance, safety, and troubleshooting.

Exam Room Approved Books

The approved S-1 exam-room materials included in this package are Manual N, the International Mechanical Code, NFPA 31, NFPA 54, OSHA 29 CFR Part 1926, Modern Refrigeration and Air Conditioning, the Ductulator, HVAC Duct Construction Standards, NFPA 58, and NFPA 56.

Modern Hydronic Heating, Residential Oil Burners, and Steam Plant Operation are supplemental study materials and are not listed as books allowed inside the S-1 examination room.

Candidates are responsible for bringing their approved references and tools to the testing center. The examination location does not provide each candidate with a complete personal reference set.

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 gas-pipe sizing with NFPA 54 using the longest-length method. Use NFPA 56 to review the special hazards and procedures associated with cleaning and purging flammable gas piping.

Use Manual N to practice small-commercial heating and cooling load calculations. Use the Ductulator and HVAC Duct Construction Standards to connect airflow calculations with practical duct sizing and construction requirements.

Use NFPA 31 and Residential Oil Burners to study oil-burning equipment, fuel delivery, tanks, controls, combustion, adjustment, testing, service, and troubleshooting.

Use Modern Hydronic Heating and Steam Plant Operation to strengthen understanding of boilers, steam generation, hydronic circulation, piping arrangements, pumps, expansion control, heat emitters, water treatment, controls, and system operation.

Timed practice should include selecting the correct reference before starting 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 approved exam-room references and supplemental technical books. The package supports study across fuel gas, load calculations, hydronics, oil burners, refrigeration, boilers, ducts, controls, safety, ventilation, and mechanical requirements.

Trade-focused review helps candidates connect each examination category 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.

The supplemental books provide additional technical explanations for hydronic heating, oil-burner systems, boilers, steam equipment, controls, piping, and maintenance. These resources help candidates understand the underlying concepts before researching formal code or standard requirements.

Practice-oriented preparation helps candidates work through calculations, locate technical tables, interpret diagrams, and identify weaker subjects. Reference-navigation practice can also improve the ability to choose the correct book and manage the three-hour examination period.

No exam book package can guarantee examination eligibility, a passing result, application approval, or license issuance. Candidates remain responsible for meeting Connecticut’s qualification requirements, preparing thoroughly, passing the required examinations, and completing every licensing step.

FAQ Section

What books are included in this S-1 package?

The package includes ten approved exam-room references and tools plus three supplemental study books covering hydronics, oil burners, and steam-plant operation.

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.

Are all thirteen books allowed into the examination?

No. Modern Hydronic Heating, Residential Oil Burners, and Steam Plant Operation are supplemental study resources and are not listed as approved exam-room books.

Is a Ductulator included?

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

Does the package include natural-gas, oil, and LP gas references?

Yes. The package includes NFPA 54 for natural gas, NFPA 31 for oil-burning equipment, and NFPA 58 for LP gas systems.

Are the books highlighted and tabbed?

No highlighting or tabbing service is identified as part of this standard S-1 Exam Book Package.

Does this package include online course access?

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

Does this package include the Connecticut Business and Law book?

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

Is this a rental package?

No. This product is a standard book package and is not identified as a rental.

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.