Connecticut Limited Warm Air, Air Conditioning And Refrigeration System Journeyperson D-2 Exam - Online Practice Questions

Prepare for the Connecticut D-2 Limited Warm Air, Air Conditioning and Refrigeration System Journeyperson Exam with online practice questions focused on the HVAC, refrigeration, fuel gas, ductwork, safety, controls, equipment, and mechanical-code knowledge covered by the licensing examination. This preparation product includes 3 months access, giving candidates time to work through practice questions, identify weaker subjects, review the applicable references, and develop a more organized study routine.

The Connecticut D-2 examination is designed for journeyperson candidates working with limited warm air, air conditioning, and refrigeration systems. The scope includes the installation, repair, replacement, maintenance, and alteration of qualifying systems and related piping, pumping equipment, fuel gas equipment, and sheet metal work within the limits of the credential.

The D-2 trade examination contains 60 questions, allows 2 hours for completion, and requires a minimum passing score of 70%. It is an open-book examination, so candidates need both strong trade knowledge and the ability to navigate the applicable references efficiently.

This online practice product is organized around the major technical resources associated with the exam, including the International Mechanical Code, 2021, NFPA 54 - National Fuel Gas Code Handbook, 2012, Modern Refrigeration and Air Conditioning, 22nd edition, the Ductulator, HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition, and NFPA 58 - Liquefied Petroleum Gas Code, 2014.

The examination covers subjects ranging from heating and cooling principles to refrigeration, controls, furnaces, heat pumps, fuel gas systems, ductwork, ventilation, chillers, workplace safety, and equipment installation. Fuel Gas Systems and Refrigerants and Refrigeration receive substantial emphasis, making them important areas for repeated practice.

The included 3 months access allows candidates to use the online practice questions throughout their preparation period. Practice can be combined with direct reference-book study so candidates develop a better understanding of both the technical material and where important information is located.

What You Get

• Online Practice Questions: Exam-focused practice for the Connecticut D-2 Limited Warm Air, Air Conditioning and Refrigeration System Journeyperson examination.
• Course Access: 3 months access included.
• HVAC and Refrigeration Review: Practice involving heating and cooling principles, refrigerants, equipment, controls, furnaces, heat pumps, chillers, and system operation.
• Fuel Gas Preparation: Review of natural gas and LP-Gas concepts associated with the D-2 examination.
• Ductwork Preparation: Practice involving duct systems, construction standards, airflow concepts, and Ductulator use.
• Reference Navigation Practice: Study designed to encourage more efficient use of the mechanical, fuel gas, refrigeration, duct, and safety references.

Exam Details

The Connecticut D-2 Limited Warm Air, Air Conditioning and Refrigeration System Journeyperson examination contains 60 questions. Candidates are allowed 2 hours to complete the examination and must earn a minimum score of 70% to pass.

The official examination content is divided into the following subject areas:

• Insulation: 1 question
• Hangers and Supports: 2 questions
• Sound, Vibration and Seismic Control: 1 question
• Heating and Cooling Principles: 5 questions
• Refrigerants and Refrigeration: 8 questions
• Testing, Adjusting and Balancing: 1 question
• Controls: 3 questions
• Machine Room: 1 question
• A/C and Heat Pump Equipment: 5 questions
• Furnaces and Heaters: 4 questions
• Chimneys, Flues and Vents: 2 questions
• Combustion Air: 2 questions
• Fuel Gas Systems: 10 questions
• Ducts: 6 questions
• Chillers: 2 questions
• Ventilation and Exhaust: 3 questions
• Safety: 4 questions

Fuel Gas Systems is the largest individual content area with 10 questions. Candidates should be prepared for subjects involving fuel gas piping, sizing, appliance connections, combustion air, valves, pressure, venting, and related installation requirements.

Refrigerants and Refrigeration account for 8 questions. Candidates should understand the refrigeration cycle, refrigerant conditions, compressors, condensers, metering devices, evaporators, pressure-temperature relationships, and basic system operation.

Ducts account for 6 questions, while Heating and Cooling Principles and A/C and Heat Pump Equipment each account for 5. These subjects combine trade knowledge with code and reference navigation.

Open Book Test

The Connecticut D-2 Limited Warm Air, Air Conditioning and Refrigeration System Journeyperson examination is an open-book test.

Candidates can use the approved references during the examination, but an open-book format should not be treated as a substitute for studying. With 60 questions and a two-hour testing period, candidates need to recognize topics quickly and know which reference is most likely to contain the applicable information.

The International Mechanical Code, 2021 supports preparation for mechanical-system requirements involving equipment, refrigeration, machinery rooms, ventilation, exhaust, ducts, combustion air, and other mechanical installations.

NFPA 54 is particularly important for natural-gas subjects. For gas-pipe sizing questions based on this reference, candidates should be prepared to use the longest length method.

NFPA 58 supports preparation involving liquefied petroleum gas systems, including LP-Gas equipment, containers, piping, installation, and safety requirements.

Modern Refrigeration and Air Conditioning, 22nd edition supports trade knowledge involving refrigeration theory, HVAC equipment, system components, controls, service procedures, heating, cooling, heat pumps, and troubleshooting concepts.

The Ductulator and HVAC Duct Construction Standards support preparation involving duct sizing, airflow, friction, velocity, fabrication, reinforcement, connections, supports, and metal or flexible duct construction.

During preparation, candidates should practice reading the question first, identifying the central subject, selecting the appropriate reference, and then locating the applicable information. This approach can reduce unnecessary searching across multiple books.

Licensing Steps

The D-2 examination is part of Connecticut's occupational licensing process for heating, piping, and cooling trades. Candidates must meet the applicable qualification requirements before completing the journeyperson licensing process.

1. Confirm the D-2 classification. Make sure the Limited Warm Air, Air Conditioning and Refrigeration System Journeyperson credential matches the trade work you intend to perform.
2. Complete the qualifying training pathway. Connecticut requires completion of a registered apprenticeship program or equivalent experience and training for the D-2 examination.
3. Prepare the required documentation. Organize apprenticeship, classroom training, work experience, or equivalency records needed for the application.
4. Apply through the Connecticut Department of Consumer Protection. Submit the applicable journeyperson license application and supporting materials.
5. Receive examination eligibility. Eligibility to take the licensing examination is determined through the state licensing process.
6. Prepare for the D-2 examination. Study the official content areas and practice using the listed exam references.
7. Schedule the PSI examination. After eligibility is established, candidates can schedule the applicable exam through PSI.
8. Complete the examination and licensing requirements. After successfully completing the required examination, follow the state process for issuance of the applicable D-2 credential.

State Requirements

The Connecticut D-2 credential is the Limited Warm Air, Air Conditioning and Refrigeration System Journeyperson license.

The holder may perform the installation, repair, replacement, maintenance, or alteration of warm air, air conditioning, and refrigeration systems, including necessary piping used for the conveyance of heating or cooling media and associated pumping equipment.

The scope also includes LP gas supplied by gas containers, natural gas piping, approved gas appliances, gas utilization equipment and accessories within the limitations of the credential. The license also includes sheet metal work as it pertains to the D-2 scope.

The D-2 license does not include the installation or servicing of oil burners of any size.

A D-2 journeyperson performs qualifying work while employed by a contractor licensed for that work. Applicants must complete a registered apprenticeship program or equivalent experience and training to qualify for the license examination.

Connecticut's D-2 apprenticeship-equivalency framework identifies 4,000 hours of on-the-job training and 432 hours of related classroom instruction for this classification. The work-training structure includes safety, pipe and tube work, warm-air heating and cooling, residential and commercial cooling, commercial and industrial refrigeration, and associated trade knowledge.

Reference Books

• International Mechanical Code, 2021
  This code supports preparation involving refrigeration systems, mechanical equipment, ducts, ventilation, exhaust, combustion air, machinery rooms, installation requirements, and other mechanical-code subjects.
• NFPA 54 - Standard for National Fuel Gas Code Handbook, 2012
  This fuel gas reference supports preparation involving natural gas piping, sizing, appliance connections, combustion air, venting, pressure, valves, and related installation requirements.
• Modern Refrigeration and Air Conditioning, 22nd edition
  This HVAC and refrigeration reference supports study involving the refrigeration cycle, components, refrigerants, furnaces, air conditioning, heat pumps, controls, service procedures, system operation, and troubleshooting concepts.
• Ductulator
  This HVAC sizing tool supports preparation involving duct airflow, friction rate, velocity, duct dimensions, and air-distribution calculations.
• HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition
  This reference supports preparation involving metal and flexible duct construction, reinforcement, supports, connections, fabrication, and installation practices.
• NFPA 58 - Standard for Liquid Petroleum Gas Code, 2014
  This code supports preparation involving LP-Gas systems, containers, piping, equipment, installation, storage, and safety requirements.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  This safety reference supports examination preparation involving construction workplace safety and OSHA requirements applicable to the trade.

Exam Room Approved Books

The Connecticut D-2 examination permits approved reference materials in the examination center. The listed references include:

• International Mechanical Code or International Mechanical Code Commentary, 2015, 2018, or 2021 Edition
  Candidates may use one of the listed editions for mechanical-code questions, including the International Mechanical Code, 2021 included in this study list.
• NFPA 54 - National Fuel Gas Code or National Fuel Gas Code Handbook, 2012
  Used for natural gas systems, piping, sizing, combustion, venting, and related requirements.
• Code of Federal Regulations - 29 CFR Part 1926 or approved OSHA selections
  Used for construction safety subjects included on the D-2 examination.
• Modern Refrigeration and Air Conditioning, 22nd edition
  Used for HVAC and refrigeration trade-knowledge subjects.
• ACCA Ductulator
  Used for duct sizing and airflow calculations.
• HVAC Duct Construction Standards, 2005, 3rd Edition
  Used for duct construction and installation requirements.
• NFPA 58 - Liquefied Petroleum Gas Code, 2014
  Used for LP-Gas system requirements.

Test Information and Study Materials

A strong D-2 preparation plan should give additional attention to the most heavily tested subjects while still reviewing every category on the examination outline.

Fuel Gas Systems should receive significant study time because this category contains 10 questions. Candidates should practice fuel-gas piping concepts, sizing, pressure, valves, appliance connections, combustion air, venting, and installation requirements. Reference navigation in NFPA 54 should become familiar before exam day.

Refrigerants and Refrigeration should include the basic refrigeration cycle and the functions of the compressor, condenser, metering device, and evaporator. Study refrigerant pressures and temperatures, system operating conditions, heat transfer, superheat, subcooling, and component relationships.

Ductwork preparation should combine construction knowledge with airflow calculations. Practice using the Ductulator for friction, velocity, airflow, and duct-sizing problems while also reviewing HVAC Duct Construction Standards for installation and fabrication requirements.

Heating and Cooling Principles should include heat transfer, sensible heat, latent heat, temperature relationships, humidity, airflow, and the basic principles that determine how HVAC systems heat and cool occupied spaces.

A/C and Heat Pump Equipment preparation should address component operation, cooling cycles, heating modes, reversing operation, airflow, controls, and system performance.

Furnaces and Heaters should include burners, heat exchangers, controls, combustion, safeties, airflow, venting, and equipment operation.

Controls should include thermostats, switches, relays, contactors, sensors, safety devices, and basic operating sequences. Understanding how controls interact with equipment can help candidates analyze practical system questions.

Ventilation and Exhaust preparation should include airflow, required ventilation, exhaust-system principles, duct arrangements, and mechanical-code provisions affecting these systems.

Chillers should be reviewed for their general refrigeration-cycle operation, components, controls, and relationship to larger cooling systems.

Safety should include applicable construction workplace requirements. Candidates should be prepared for OSHA-related questions involving common hazards encountered during HVAC and refrigeration work.

The online practice questions are most useful when missed answers lead to additional study. If fuel-gas questions create difficulty, return to NFPA 54. If duct questions are weak, use the Ductulator and duct construction standards. If refrigeration questions are difficult, return to Modern Refrigeration and Air Conditioning.

Because the D-2 exam is open book, repeated reference navigation is an important part of preparation. Practice using tables of contents, indexes, definitions, charts, tables, chapter headings, and cross-references rather than relying on an unfamiliar book for the first time during the exam.

The included 3 months access provides time to work through the material in stages. Candidates can complete practice questions, track weaker categories, revisit applicable references, and repeat difficult subjects throughout the access period.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep supports Connecticut D-2 candidates through organized study guidance, HVAC and refrigeration trade review, practice-oriented preparation, reference navigation, and structured online practice questions.

The D-2 examination covers a broad range of technical material. Practice questions help candidates identify whether additional preparation is needed in fuel gas systems, refrigeration, ductwork, controls, heat pumps, furnaces, ventilation, chillers, mechanical code, or safety.

Reference navigation is especially valuable for an open-book examination. Candidates can practice recognizing the subject of a question, choosing the appropriate reference, and locating the applicable requirement without spending unnecessary time searching unrelated material.

Trade-focused review also helps candidates connect individual exam subjects. Refrigeration equipment depends on refrigerants, airflow, controls, electrical components, mechanical installation, piping, and safe operating practices. Understanding these relationships can make technical questions easier to interpret.

The included 3 months access creates a structured preparation window for repeated practice. Candidates can study one subject, complete related questions, review mistakes, return to the references, and then revisit the topic later to reinforce retention.

1 Exam Prep's goal is to help candidates approach the Connecticut Limited Warm Air, Air Conditioning and Refrigeration System Journeyperson D-2 examination with stronger trade knowledge, improved reference-navigation skills, and a more organized study structure without guaranteeing a passing score or licensing approval.

How many questions are on the Connecticut D-2 exam?

The D-2 Limited Warm Air, Air Conditioning and Refrigeration System Journeyperson examination contains 60 questions.

How much time is allowed for the D-2 examination?

Candidates are allowed 2 hours to complete the examination.

What is the passing score for the Connecticut D-2 exam?

The minimum passing score is 70%.

Is the Connecticut D-2 examination open book?

Yes. The D-2 examination is an open-book test using approved reference materials.

What is the largest subject on the D-2 exam?

Fuel Gas Systems is the largest individual content area with 10 questions.

Does the D-2 exam cover refrigeration?

Yes. Refrigerants and Refrigeration account for 8 questions on the examination.

Does the exam cover duct systems?

Yes. Ducts account for 6 questions, and both the Ductulator and HVAC Duct Construction Standards are among the exam references.

Can I use the 2021 International Mechanical Code?

Yes. The International Mechanical Code, 2021 is one of the listed editions permitted for the D-2 examination.

Is Modern Refrigeration and Air Conditioning, 22nd edition an exam reference?

Yes. Modern Refrigeration and Air Conditioning, 22nd edition is listed as a reference for the D-2 examination.

What training is required to qualify for the D-2 license examination?

Applicants must complete a registered apprenticeship program or equivalent experience and training. Connecticut identifies 4,000 hours of on-the-job training and 432 classroom hours for the D-2 apprenticeship-equivalency framework.

Can a D-2 journeyperson service oil burners?

No. The D-2 scope does not include the installation or servicing of oil burners of any size.

How long is access to the online practice questions?

This product includes 3 months access.

How should I use these online practice questions?

Use the questions to measure your understanding, identify weak exam categories, return to the appropriate reference for additional study, and repeat difficult subjects until the material and reference locations become more familiar.

Do the online practice questions guarantee a passing score?

No. The online practice questions provide structured preparation and study support. Examination results depend on each candidate's experience, technical knowledge, study, reference familiarity, and performance on exam day.