Connecticut Limited Contractor (S-7) Books Allowed into Exam Package

Prepare for the Connecticut Limited Contractor (S-7) examination with a focused package containing the six technical references allowed into the open-book trade exam. This package is designed for experienced heating professionals, licensed journeypersons, boiler technicians, oil-burner specialists, hydronic installers, pipefitters, service technicians, and qualified applicants pursuing the Connecticut S-7 Limited Contractor license.

The S-7 examination evaluates technical knowledge involving hydronic heating, fuel-gas systems, oil burners, piping, boilers, controls, combustion air, chimneys, flues, vents, insulation, maintenance, and system testing. Candidates must combine practical trade experience with the ability to locate code requirements, sizing information, equipment guidance, and installation rules efficiently during a timed examination.

This package includes the International Mechanical Code, 2021, International Residential Code for One- and Two-Family Dwellings, 2021, NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011, NFPA 54: National Fuel Gas Code Handbook, 2012, Modern Refrigeration and Air Conditioning, 22nd Edition, and NFPA 58: Liquefied Petroleum Gas Code, 2014.

Each reference supports a different part of the examination. The mechanical and residential codes address heating equipment, boilers, piping, appliance installation, combustion air, venting, clearances, and residential system requirements. NFPA 31 covers oil-burning equipment, while NFPA 54 and NFPA 58 support natural-gas and liquefied petroleum gas questions.

Modern Refrigeration and Air Conditioning, 22nd Edition provides broader technical coverage involving heating principles, system components, controls, combustion, piping, equipment operation, maintenance, testing, and troubleshooting. Together, the six books provide a coordinated reference library for the principal subjects included in the Connecticut S-7 trade examination.

The Connecticut S-7 examination is open book and timed. Candidates should not expect to search every book for every question. Successful preparation includes understanding the role of each reference, knowing how each book is organized, practicing with indexes and tables, and developing a reliable method for identifying the correct source quickly.

This product contains standard exam-room reference books. Highlighting and tabbing, online course access, additional study books, Application Service, Business and Law materials, examination registration, government fees, book rental, and professional licensing approval are not identified as included.

Exam Details

The Connecticut S-7 Limited Contractor trade examination contains 60 questions. Candidates receive two hours to complete the test and must earn a minimum score of 70 percent.

The published examination content outline includes:

• Chimneys, Flues, and Vents: 5 questions
• Insulation: 2 questions
• General Knowledge: 6 questions
• Controls: 4 questions
• Hydronics: 10 questions
• Fuel Gas Systems: 10 questions
• Oil Burners: 6 questions
• Piping: 6 questions
• Boilers: 2 questions
• Maintenance and Testing: 4 questions
• Combustion Air: 2 questions

Hydronics and fuel-gas systems are the largest individual examination areas. Candidates should devote substantial study time to hot-water heating principles, system circulation, pumps, expansion tanks, air control, zoning, heat emitters, piping layouts, valves, gas-pipe sizing, appliance connections, pressure regulation, combustion air, and venting.

Chimney, flue, and vent questions may involve approved materials, sizing, clearances, connectors, terminations, draft, appliance categories, and the safe removal of combustion products. Candidates should understand how fuel type, appliance input, vent configuration, building conditions, and equipment location affect venting requirements.

General-knowledge questions may address heating principles, heat transfer, combustion, system components, tools, materials, basic calculations, equipment operation, and safe work practices. Candidates should understand how pressure, temperature, flow, heat output, equipment capacity, and system design affect heating performance.

Control questions may involve thermostats, transformers, relays, zone valves, circulators, aquastats, limit controls, operating controls, safety devices, and basic electrical sequences. Candidates should be able to identify the function of each control and understand how multiple controls interact during startup, normal operation, and shutdown.

Oil-burner questions may cover storage tanks, fuel piping, filters, pumps, burner motors, nozzles, ignition, combustion, draft, flame characteristics, testing, maintenance, and installation requirements. Candidates should understand how fuel pressure, nozzle selection, combustion air, electrode adjustment, draft, and burner setup affect system operation.

Piping questions may involve approved materials, fittings, valves, supports, joining methods, sizing, circulation, expansion, system layout, and installation practices. Candidates should recognize how improper pipe sizing, poor support, incorrect valve placement, or unsuitable materials can affect safety and performance.

Boiler questions may involve boiler components, operating pressure, temperature, relief devices, low-water protection, circulating equipment, controls, and service procedures. Maintenance and testing questions may address inspection, cleaning, troubleshooting, combustion testing, leak testing, startup, shutdown, and verification of safe operation.

Open Book Test

The Connecticut Limited Contractor (S-7) trade examination is an open-book test. Candidates are responsible for bringing their own authorized references to the examination center.

The two-hour testing period allows an average of approximately two minutes per question. Candidates who are unfamiliar with the books may spend too much time searching for information and leave insufficient time for gas-pipe sizing, code interpretation, equipment questions, or technical calculations.

Reference materials may be highlighted, underlined, annotated, or indexed before the examination. Permanent tabs are permitted. Temporary tabs, including removable or repositionable notes, are not allowed.

Candidates may not write in their references during the examination. Loose papers and unauthorized attached materials are not permitted. Questions and answers written into the books must be removed before entering the testing room.

A silent, nonprinting, non-programmable calculator may be used during the examination. Candidates should practice using an approved calculator while completing piping, load, heat, flow, and fuel-gas exercises.

Code questions are based on the listed editions of the approved code books. Candidates should bring the correct editions and become familiar with their chapter organization, indexes, definitions, tables, figures, exceptions, and appendices before test day.

For gas-pipe sizing questions, candidates must use the longest-length method. Preparation should include identifying the total connected load, determining the longest developed length, selecting the correct fuel and pressure table, and choosing a pipe size that provides sufficient capacity.

Use the International Mechanical Code for mechanical-system installation requirements involving boilers, hydronic piping, fuel systems, appliance locations, combustion air, chimneys, vents, clearances, and safety provisions.

Use the International Residential Code for heating and fuel-gas requirements that apply to one- and two-family dwellings. Candidates should become familiar with residential mechanical chapters, fuel-gas provisions, definitions, tables, and appliance-installation requirements.

Use NFPA 31 for questions involving oil-burning equipment, oil storage, fuel supply piping, burner installation, controls, combustion air, venting, and safety. Use NFPA 54 for natural-gas systems and NFPA 58 for liquefied petroleum gas installations.

Use Modern Refrigeration and Air Conditioning for general heating theory, equipment, controls, service procedures, combustion, piping, maintenance, testing, and troubleshooting.

Develop a repeatable search method. Identify the main subject in the question, choose the most relevant book, use the index or table of contents, and review the complete applicable section. Read table headings, notes, exceptions, definitions, and nearby requirements before selecting an answer.

Licensing Steps

The Connecticut Department of Consumer Protection reviews occupational trade applications and determines examination eligibility. PSI administers the examination after the state approves the applicant.

1. Confirm the S-7 classification. Review the Connecticut Limited Contractor license scope and determine whether it matches the heating work you intend to perform or supervise.
2. Meet the qualification requirement. Contractor applicants must document the required journeyperson-level experience or equivalent experience and training accepted by Connecticut.
3. Complete the state application. Submit the occupational licensing application through the process established by the Connecticut Department of Consumer Protection.
4. Provide supporting records. Submit employment, licensing, apprenticeship, classroom training, on-the-job training, education, or equivalent-experience documentation requested by the state.
5. Obtain third-party verification. Employers, supervisors, training programs, licensing authorities, or other organizations may need to verify information.
6. Receive approval to test. The Department of Consumer Protection must approve the applicant’s eligibility before examination registration.
7. Register with PSI. After approval, create or access the testing account, pay the applicable examination charges, and schedule the required testing portions.
8. Prepare the exam-room books. Confirm that the references, permanent tabs, annotations, and calculator comply with the current testing rules.
9. Prepare for the trade exam. Review all published subject areas and practice navigating the six authorized references under timed conditions.
10. Prepare for the Business and Law exam. Contractor applicants must also satisfy the applicable contractor business-examination requirement unless an accepted prior result applies.
11. Take the required examinations. Bring acceptable identification, authorized references, and a permitted calculator to the testing center.
12. Complete the licensing process. Submit passing results, licensing charges, and any remaining documentation required by Connecticut.

The S-7 trade examination and the contractor Business and Law examination are separate testing requirements. Passing the S-7 trade portion does not replace the contractor business examination when both are required.

This Books Allowed into Exam Package does not include the Business and Law reference, Application Service, application preparation, PSI registration, examination charges, state licensing fees, or submission of licensing documents.

State Requirements

The Connecticut S-7 Limited Contractor credential is a contractor-level heating license. It covers a limited scope of hot-water and low-pressure steam-heating work established by Connecticut.

The authorized scope includes qualifying heating systems in buildings not more than three stories high. The total heating load may not exceed 500,000 BTUs, and steam pressure may not exceed 15 pounds.

The license also covers the servicing and installation of oil burners handling up to five gallons per hour. Gas burners and gas piping are included when connected with work permitted under the S-7 classification.

Applicants must document two years as a properly licensed journeyperson or equivalent experience and training accepted by the Connecticut Department of Consumer Protection.

Applicants using an equivalent-experience pathway may need to document classroom education and on-the-job training that correspond to the S-7 classification. Connecticut’s equivalent-experience guidance identifies 12,000 total on-the-job training hours and 576 classroom hours for the S-7 contractor pathway.

Connecticut does not have reciprocal licensing agreements for this occupational classification. Applicants with credentials from another state must still apply and provide documentation for Connecticut’s review.

Only individuals may apply for the occupational license. A company does not receive the individual S-7 professional credential. Business registrations and company-level operating requirements are handled separately.

PSI administers the examinations but does not determine licensing eligibility. The Department of Consumer Protection reviews the applicant’s qualifications and authorizes testing.

After passing the required examinations, the applicant must complete all remaining licensing requirements and submit the applicable state charges. Passing an examination does not by itself authorize contracting work.

A Connecticut occupational contractor license is separate from business registration, tax accounts, insurance, permits, home-improvement registration, and other credentials that may apply to a company’s operations.

Reference Books

• International Mechanical Code, 2021
  This code supports preparation involving boilers, heating equipment, hydronic piping, combustion air, chimneys, vents, fuel systems, appliance installation, clearances, and mechanical safety requirements.
• International Residential Code for One- and Two-Family Dwellings, 2021
  This residential code addresses heating systems, fuel-gas installations, appliance locations, combustion air, piping, venting, clearances, and mechanical requirements for one- and two-family dwellings.
• NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011
  This standard covers oil-burning appliances, burners, storage tanks, fuel piping, controls, combustion air, venting, installation, operation, and related safety provisions.
• NFPA 54: National Fuel Gas Code Handbook, 2012
  This handbook supports study of natural-gas piping, pipe sizing, pressure regulation, appliance installation, combustion air, venting, testing, purging, and fuel-gas safety.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  This technical reference supports general heating knowledge, system components, controls, combustion, equipment operation, piping, service procedures, maintenance, testing, and troubleshooting.
• NFPA 58: Liquefied Petroleum Gas Code, 2014
  This code covers LP-gas containers, regulators, piping, equipment, separation distances, installation, testing, operation, storage, handling, and safety requirements.

Exam Room Approved Books

• International Mechanical Code, 2021
  Allowed for mechanical-system, boiler, piping, combustion-air, chimney, vent, fuel-system, and equipment-installation questions.
• International Residential Code for One- and Two-Family Dwellings, 2021
  Allowed for residential heating, mechanical, fuel-gas, appliance, piping, combustion-air, and venting requirements.
• NFPA 31: Standard for the Installation of Oil-Burning Equipment, 2011
  Allowed for oil-burner, fuel-storage, oil-piping, combustion-air, venting, controls, and equipment-installation questions.
• NFPA 54: National Fuel Gas Code Handbook, 2012
  Allowed for natural-gas piping, longest-length sizing, appliance installation, pressure regulation, testing, combustion air, and venting.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  Allowed for general heating knowledge, controls, equipment, combustion, piping, service, maintenance, and troubleshooting.
• NFPA 58: Liquefied Petroleum Gas Code, 2014
  Allowed for LP-gas containers, regulators, piping, separation distances, equipment, installation, testing, and safety.

Test Information and Study Materials

Build a study schedule around the published examination categories. Give substantial attention to hydronics and fuel-gas systems because these subjects account for a significant portion of the 60-question examination.

Create a reference map that identifies which book should be used for each major subject. Practice going directly to the applicable code, standard, chapter, section, or table instead of searching every reference.

Review gas-pipe sizing with the longest-length method. Practice calculating connected loads, determining developed length, identifying the correct pressure and material table, and choosing an acceptable pipe size.

For hydronic systems, review circulation, pumps, expansion tanks, air separators, heat emitters, zoning, piping layouts, controls, pressure, temperature, and system flow.

For oil-burning equipment, study storage tanks, supply piping, pumps, filters, nozzles, ignition, combustion, draft, burner adjustment, venting, controls, testing, and maintenance.

Practice locating chimney, vent, and combustion-air requirements in the appropriate references. Pay attention to appliance input, building volume, vent type, clearances, connector sizing, and termination conditions.

Complete timed practice sessions using only the six references included in this package. Answer familiar questions first, mark lengthy code searches, and return to them after completing the remaining questions.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Connecticut S-7 candidates organize the authorized references needed for open-book examination preparation. This package brings the six listed exam-room books together so candidates can build a focused technical library.

The references support trade-focused review of hydronic heating, fuel-gas systems, oil burners, piping, boilers, controls, combustion air, chimneys, vents, insulation, maintenance, and system testing.

An organized study process can make a multi-book examination easier to manage. Review one subject at a time, identify the best reference, locate the supporting requirement, and return to the books when reviewing missed practice questions.

Reference-navigation practice is especially important for a two-hour examination. Candidates who understand the purpose and organization of each book can spend less time searching and more time interpreting the question.

This package does not guarantee a passing score, state approval, examination eligibility, or license issuance. Results depend on the candidate’s qualifications, trade experience, technical knowledge, preparation, reference familiarity, and examination performance.

FAQ Section

Which books are included in this package?

The package includes the 2021 International Mechanical Code, the 2021 International Residential Code, NFPA 31 from 2011, the 2012 NFPA 54 Handbook, Modern Refrigeration and Air Conditioning, 22nd Edition, and NFPA 58 from 2014.

Are all included books allowed into the S-7 examination?

Yes. This package contains the six references identified for use during the Connecticut S-7 open-book trade examination, subject to current testing-center rules.

Is the Connecticut S-7 examination open book?

Yes. The Connecticut S-7 Limited Contractor trade examination is open book.

How many questions are on the S-7 trade examination?

The examination contains 60 questions and allows two hours for completion.

What score is required to pass?

A minimum score of 70 percent is required.

Can the books be highlighted and tabbed?

The references may be highlighted, underlined, annotated, or indexed before the examination. Permanent tabs are permitted, but temporary tabs are not allowed.

Can candidates write in the books during the examination?

No. Candidates may not write in their references during the examination.

Are the books already highlighted and tabbed?

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

Does the package include additional study books?

No. This product contains the six books allowed into the S-7 examination. Additional hydronic, oil-burner, or pipefitting study books are not identified as included.

Does an S-7 applicant take a Business and Law examination?

Contractor applicants must satisfy the applicable trade and contractor Business and Law examination requirements unless an accepted prior business-exam result applies.

Does this package include Application Service?

No. Application Service is not included. Candidates are responsible for completing the Connecticut application and submitting the required qualification records.

Are application and examination fees included?

No. State application fees, PSI examination charges, licensing fees, and other third-party costs are not included.

Does purchasing the package guarantee examination approval?

No. Connecticut determines eligibility based on the applicant’s experience, training, licensing history, and supporting documentation.

Does passing the examinations automatically issue the license?

No. Passing the required examinations is one part of the licensing process. The applicant must complete all remaining Connecticut requirements before the license can be issued.