Connecticut Limited Contractor (S-7) Exam Book Package

Prepare for the Connecticut Limited Contractor (S-7) examination with a coordinated collection of mechanical codes, fuel-gas standards, oil-burning requirements, hydronic-heating resources, piping guidance, and HVAC technical references. This package combines the books identified for use during the open-book trade examination with additional study references that support broader preparation for the S-7 Limited Contractor license.

The Connecticut S-7 license applies to a defined area of heating work. Candidates preparing for this contractor-level credential should understand hot-water and low-pressure steam heating systems, fuel-gas systems, oil burners, boilers, piping, hydronic controls, combustion air, chimneys, flues, vents, insulation, maintenance, and system testing.

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.

The package also includes Residential Oil Burners, 3rd Edition, Pipefitter’s Handbook, and Modern Hydronic Heating for Residential and Light Commercial Buildings by John Siegenthaler, P.E., 2022. These additional study books support preparation involving oil-burner operation, piping practices, hydronic design, system components, heat distribution, controls, troubleshooting, and residential heating applications.

The S-7 examination requires more than general heating experience. Candidates must be able to identify the correct reference, locate technical requirements efficiently, interpret tables and diagrams, perform basic piping or system calculations, and apply code provisions to practical installation and service situations.

This Connecticut S-7 exam book package is designed for experienced heating technicians, S-8 journeypersons, oil-burner professionals, hydronic installers, boiler technicians, pipefitters, service professionals, and qualified applicants pursuing a contractor-level heating license.

This product contains the listed exam and study books. Online course access, highlighting and tabbing, Application Service, examination registration, contractor business-exam materials, 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 examination 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 categories. Candidates should devote substantial study time to hot-water heating principles, circulating systems, pumps, expansion tanks, air control, zoning, heat emitters, piping arrangements, valves, system controls, gas piping, appliance connections, pressure regulation, combustion, and venting.

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

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

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

Oil-burner questions may cover fuel storage, supply piping, burner components, pumps, nozzles, ignition, combustion, draft, flame characteristics, service procedures, testing, and installation requirements. Preparation should also include oil-burning equipment safety and the relationship among firing rate, burner setup, combustion air, and venting.

Piping questions may involve pipe materials, valves, fittings, supports, sizing, joining methods, expansion, circulation, flow, and installation practices. Candidates should be familiar with common hydronic and fuel-gas piping arrangements and know how improper sizing or installation can affect performance and safety.

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

Open Book Test

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

The following books in this package are identified for use during the S-7 trade examination:

• 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
• NFPA 58: Liquefied Petroleum Gas Code, 2014

The following books are included as additional study references but are not identified as books allowed in the examination room:

• Residential Oil Burners, 3rd Edition
• Pipefitter’s Handbook
• Modern Hydronic Heating for Residential and Light Commercial Buildings, John Siegenthaler, P.E., 2022

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 for fuel-gas sizing, piping, heat, flow, and other trade calculations that may appear during preparation.

For gas-pipe sizing questions, candidates must use the longest-length method. Practice locating the correct sizing table, identifying the system pressure and pipe material, determining the longest developed length, and selecting the required pipe size based on the connected load.

The two-hour time limit allows an average of approximately two minutes per question. Candidates who are unfamiliar with the books may lose time searching multiple references. A strong preparation plan includes knowing which reference is most useful for each subject.

Use the mechanical and residential codes for installation requirements, equipment locations, combustion air, venting, boilers, piping, and residential system provisions. Use NFPA 31 for oil-burning equipment, NFPA 54 for natural-fuel-gas questions, and NFPA 58 for liquefied petroleum gas requirements.

Use Modern Refrigeration and Air Conditioning for general heating knowledge, equipment operation, controls, combustion, piping, service, maintenance, and troubleshooting. Use the additional study books to build deeper knowledge before practicing with only the references permitted in the examination room.

Licensing Steps

The Connecticut Department of Consumer Protection reviews applications and determines eligibility for occupational trade examinations. PSI administers the examinations after the applicant receives state approval.

1. Confirm the S-7 classification. Review the license scope and determine whether it matches the heating work you intend to perform or supervise.
2. Meet the experience requirement. S-7 applicants must document two years as a properly licensed journeyperson or equivalent experience and training.
3. Complete the contractor application. Submit the required information to the Connecticut Department of Consumer Protection.
4. Provide supporting documentation. Supply employment, licensing, training, education, or equivalent-experience records requested by the state.
5. Obtain third-party verification when required. Employers, supervisors, training providers, or licensing agencies may need to confirm submitted information.
6. Receive approval to test. Connecticut must determine that the applicant meets the qualification requirements before examination registration.
7. Register with PSI. After approval, create or access the testing account, pay the applicable examination charges, and schedule the required examination portions.
8. Prepare for the S-7 trade examination. Review the content outline and practice using the approved books under timed conditions.
9. Prepare for the Business and Law examination. Connecticut requires the Business and Law examination for contractor license classifications unless a qualifying prior result applies.
10. Take the required examinations. Bring acceptable identification, approved references, and a permitted calculator.
11. Complete the licensing process. Submit the passing score reports, licensing charges, and any remaining documents required by Connecticut.

The S-7 trade exam and contractor Business and Law exam are separate testing requirements. Passing one examination does not replace the other when both are required for the contractor license.

This exam book package does not include the Business and Law reference, Application Service, state application preparation, examination scheduling, government fees, or submission of licensing documents.

State Requirements

The Connecticut S-7 Limited Contractor license permits work limited to hot-water or steam-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 covered by the S-7 license.

The S-7 is a contractor-level credential. Applicants must have two years of experience as a properly licensed journeyperson or demonstrate equivalent experience and training accepted by the Connecticut Department of Consumer Protection.

Applicants using equivalent experience or an out-of-state credential must provide enough documentation for Connecticut to evaluate their training and work history. Previous employment or licensing in another jurisdiction does not automatically establish eligibility.

PSI administers the examination but does not decide whether an applicant qualifies for the license. The Connecticut Department of Consumer Protection reviews qualifications and grants examination eligibility.

After passing the required examinations, the applicant must complete the remaining licensing requirements and submit the applicable state charges. A passing examination result alone does not authorize contracting work.

An occupational contractor license is separate from business registration, tax accounts, insurance, permits, and other operating requirements. A company may need additional Connecticut registrations depending on its structure, services, and customer contracts.

Reference Books

• International Mechanical Code, 2021
  This code supports preparation involving mechanical equipment, heating systems, boilers, hydronic piping, combustion air, chimneys, vents, fuel systems, installation clearances, and safety requirements.
• International Residential Code for One- and Two-Family Dwellings, 2021
  This residential code addresses heating equipment, mechanical systems, fuel-gas installations, combustion air, venting, piping, appliance locations, and 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, fuel tanks, oil piping, installation, combustion air, venting, controls, and related safety requirements.
• NFPA 54: National Fuel Gas Code Handbook, 2012
  This handbook supports study of natural-gas piping, sizing, appliance installation, pressure regulation, combustion air, venting, testing, and fuel-gas safety.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  This technical reference supports general heating knowledge, equipment, controls, combustion, piping, service procedures, system operation, maintenance, and troubleshooting.
• NFPA 58: Liquefied Petroleum Gas Code, 2014
  This code covers LP-gas containers, piping, regulators, equipment, installation, separation distances, testing, operation, and safety requirements.
• Residential Oil Burners, 3rd Edition
  This study reference supports review of oil-burner components, fuel delivery, burner setup, ignition, combustion, draft, testing, maintenance, and troubleshooting.
• Pipefitter’s Handbook
  This practical reference supports preparation involving piping materials, fittings, valves, measurements, calculations, layout, installation methods, and pipefitting practices.
• Modern Hydronic Heating for Residential and Light Commercial Buildings, John Siegenthaler, P.E., 2022
  This study reference explains hydronic system design, heat transfer, circulators, piping arrangements, zoning, controls, heat emitters, expansion, air management, and system performance.

Test Information and Study Materials

Begin with hydronics and fuel-gas systems because these subjects represent a significant part of the examination. Review system layouts, piping arrangements, circulators, zone controls, heat emitters, gas-pipe sizing, appliance connections, regulators, combustion air, and venting.

Create a reference map showing which book covers each major subject. Practice moving directly to the most relevant code, standard, chapter, or table instead of searching every book.

Review fuel-gas sizing with the longest-length method. Practice identifying appliance loads, developed length, pipe material, pressure, and the correct table before selecting a pipe size.

For oil-burner preparation, review tanks, supply piping, pumps, filters, nozzles, ignition, draft, combustion, burner adjustment, testing instruments, maintenance, and troubleshooting.

For hydronic systems, study pressure, temperature, flow, heat transfer, circulators, expansion tanks, air separators, zoning, boilers, valves, controls, and common piping configurations.

Complete timed practice sessions using only the six books permitted in the examination room. Answer familiar questions first, mark longer code searches, and return to difficult items after completing the remaining questions.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps Connecticut S-7 candidates organize the technical references needed for contractor examination preparation. This package combines the listed exam-room books with additional study resources covering oil burners, pipefitting, and modern hydronic-heating systems.

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

An organized study structure makes a multi-book examination easier to manage. Candidates can review one subject at a time, identify the best reference, locate the supporting information, and return to the books when reviewing missed practice questions.

Reference-navigation practice is especially important for a two-hour open-book exam. Familiarity with code organization, indexes, tables, diagrams, and chapter locations can help candidates use their testing time more effectively.

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

FAQ Section

How many books are included in this package?

The package includes nine books covering mechanical codes, residential requirements, oil-burning equipment, natural gas, LP gas, refrigeration and heating principles, oil burners, pipefitting, and hydronic heating.

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 exam?

The trade 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 every book in this package be taken into the exam?

No. Six books are identified for exam-room use. Residential Oil Burners, Pipefitter’s Handbook, and Modern Hydronic Heating are additional study references.

Can the exam books be highlighted and tabbed?

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

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

Yes. Contractor applicants must satisfy the applicable trade examination and Business and Law examination requirements unless a qualifying prior result applies.

What work does the S-7 license cover?

The license covers qualifying hot-water or low-pressure steam-heating systems in buildings not over three stories high, subject to the state’s heating-load, steam-pressure, burner, and gas-work limitations.

What experience is required?

Applicants must document two years as a properly licensed journeyperson or equivalent experience and training accepted by Connecticut.

Does this package include Application Service?

No. Application Service is not identified as included with this exam book package.

Are examination and licensing fees included?

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

Does purchasing the books guarantee examination approval?

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

Does passing the exam 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.