Oklahoma - HVACR JOURNEYMAN LIMITED

Oklahoma HVACR Journeyman Limited Exam: Complete 2026 Study Guide

Passing the Oklahoma HVACR Journeyman Limited exam is the key step between working under supervision and operating with real professional standing in the trades. The exam covers six technical areas — from refrigeration cycles to gas piping to electrical controls — and you need to answer 42 out of 60 questions correctly to pass. That's a 70% passing score, and with 180 minutes on the clock, preparation is what separates candidates who pass on the first try from those who don't. This guide breaks down exactly what's on the exam, shows you real sample questions, and points you to the best study resources available.

Oklahoma HVACR Journeyman Limited Exam Overview

Here's what to expect on test day:

• Total scored questions: 60
• Time limit: 180 minutes (3 hours)
• Passing score: 70% — you need at least 42 correct answers
• Exam format: Multiple-choice

The exam is administered by a proctored testing provider. You'll work through questions across six technical topic areas, some of which require calculation and code knowledge, others that test your practical understanding of system components and procedures.

The 180-minute window is generous — that's 3 minutes per question on average — but don't treat it as a reason to skip preparation. Many questions require you to think through multi-step scenarios or recall specific code requirements, and those take time if the material isn't fresh.

Topics Covered on the Oklahoma HVACR Journeyman Exam

The exam draws from six content areas. Here they are ranked by their weight on the actual exam, so you know where to focus your study time.

1. Refrigeration and Air Conditioning Systems — 13 items

The single heaviest topic. Expect questions on the compression refrigeration cycle, refrigerant classification and EPA Clean Air Act regulations, metering devices (TXVs, capillary tubes, EEVs), and hands-on procedures like recovery, evacuation, and charging.

2. Electrical Knowledge and Controls — 15 items

This is the most heavily weighted area by raw item count. You'll need Ohm's law and Watt's law calculations, an understanding of single-phase and three-phase motor types, motor starting relays, and pressure/temperature controls.

3. Air Distribution Systems — 10 items

Duct construction, system configurations (radial, extended plenum, SDHV), ACCA Manual D sizing procedures, damper types, and duct insulation and sealing requirements per IMC Chapter 6.

4. Heating Systems — 10 items

Gas and oil-fired heating, hydronic system components, heat pump operation including reversing valves, and electric resistance heating.

5. Natural Gas — 9 items

Gas piping materials, sizing methods, pressure testing, combustion air requirements, and venting categories (Type B, direct-vent, Categories I–IV).

6. Safety — 3 items

Lockout/tagout procedures, fire extinguisher use (P.A.S.S.), refrigerant cylinder safety, PPE selection, and GHS/SDS hazard communication.

Sample Questions from the Oklahoma HVACR Journeyman Exam

Here are five questions representative of what you'll see on test day. Think through each one — then check your reasoning against our free practice exam to see how you actually do.

Question 1 — Refrigeration and Air Conditioning Systems

A journeyman technician is installing a heat pump system that uses two standard thermostatic expansion valves (TXVs). Because standard TXVs only allow refrigerant flow in one direction, what additional component must be installed in parallel with each TXV to allow proper refrigerant circulation in both heating and cooling modes?

• A) A pressure-regulating valve
• B) A solenoid valve
• C) A filter-drier
• D) A check valve

This question tests your understanding of how heat pump refrigerant circuits are configured to handle bidirectional flow.

Question 2 — Air Distribution Systems

When fuel-burning appliances such as furnaces and water heaters operate in a building, what effect do they tend to have on building air pressure?

• A) They equalize indoor and outdoor pressures through the flue
• B) They have no effect on building air pressure
• C) They create a positive pressure by heating the air
• D) They create a negative pressure by consuming indoor air for combustion and exhausting it outside

This one bridges combustion air requirements with building science — a practical concept that shows up in both air distribution and natural gas topics.

Question 3 — Refrigeration and Air Conditioning Systems

After drier replacement, superheat rises but pressures normal. Cause?

• A) TXV wide open
• B) Moisture entering TXV
• C) Low evaporator load
• D) Restriction at drier outlet

Short, clinical phrasing like this mirrors real diagnostic scenarios. You need to reason from symptom to cause.

Question 4 — Natural Gas

You are sizing a gas piping system and need to determine the total connected load. According to the IFGC, how should the maximum gas demand be calculated?

• A) Use 75% of the largest appliance input rating plus 50% of remaining appliances
• B) Use the sum of the maximum input of all appliances served, assuming all could operate at full capacity simultaneously
• C) Use the average input rating of all appliances multiplied by a 1.25 safety factor
• D) Use only the two largest appliance input ratings combined

This is a code-knowledge question. Knowing the IFGC method for calculating maximum gas demand is essential for the gas piping section.

Question 5 — Heating Systems

You are converting a residential furnace from natural gas to LP gas. Which component must be removed and replaced with a differently sized version to accommodate the different fuel?

• A) The heat exchanger
• B) The gas manifold
• C) The ignition control module
• D) The spuds (burner orifices)

A field-relevant question that tests whether you understand the mechanical differences between natural gas and LP conversions.

Not sure you got them right? Take the free practice exam to check your knowledge and get a feel for the real test format — no account required.

What Types of Questions to Expect

Here's a breakdown of the depth and style of questions by topic area, along with how many practice questions we've built for each:

• Electrical Knowledge and Controls (57 practice questions): Expect Ohm's law and Watt's law calculations, ladder diagram interpretation, motor capacitor identification, and scenarios involving starting relays and pressure/temperature control settings.
• Natural Gas (50 practice questions): Gas pipe sizing using IFGC capacity tables, identifying allowable pipe materials (steel, CSST, copper, PE), pressure test requirements, combustion air calculations, and matching appliances to correct venting categories.
• Air Distribution Systems (82 practice questions): Duct system configuration identification, Manual D sizing logic, register and diffuser selection, damper type and placement, and duct sealing/insulation requirements from IMC Chapter 6.
• Refrigeration and Air Conditioning Systems (73 practice questions): Refrigerant cycle component function, EPA Section 608 regulations, handling and recovery procedures, metering device selection and diagnosis, and system charging scenarios.
• Heating Systems (53 practice questions): Burner and ignition system identification, oil burner combustion testing, hydronic system components, heat pump reversing valve operation, and electric heating element types.
• Safety (15 practice questions): LOTO procedure steps, fire extinguisher operation (P.A.S.S. method), refrigerant cylinder pressure hazards, PPE selection for specific tasks, and reading GHS safety data sheets.

In total, we offer 330 practice questions across all six topic areas.

Recommended Study Materials

These are the books you'll want before you sit for this exam.

International Mechanical Code 2021 — The IMC is the primary code reference for duct systems, equipment installation clearances, and ventilation requirements. Chapter 6 covers duct construction and insulation directly. This is a must-have if you want to answer code-specific duct questions with confidence.

International Fuel Gas Code 2021 — The IFGC governs everything from gas piping materials and sizing to combustion air and venting. Nine exam items draw from this material. Read the gas pipe sizing tables closely — the exam will test your ability to apply them.

Modern Refrigeration and Air Conditioning, 20th Edition — This is the textbook that most HVACR programs use, and for good reason. It covers the refrigeration cycle, refrigerant handling, metering devices, and system diagnosis in clear, technical detail. With 13 exam items on refrigeration and air conditioning, this book earns its place on your desk.

Mathematics for Plumbers and Pipefitters, 8th Edition — Don't underestimate the calculation questions. This resource helps reinforce the math skills you'll need for Ohm's law, Watt's law, and gas pipe sizing — the kind of applied arithmetic that shows up across multiple topic areas.

Study Tips for the Oklahoma HVACR Journeyman Exam

Start with your weakest topics, not your strongest. It's tempting to review what you already know. But the exam doesn't reward comfort — it rewards breadth. Electrical and refrigeration together account for 28 of the 60 scored items, so gaps there are costly.

Work through calculations by hand. Ohm's law, Watt's law, and gas pipe sizing aren't hard once you've practiced them — but you have to actually practice them. Write out the formulas and run through sample problems until the process is automatic.

Know your code references. A meaningful portion of the exam is code-knowledge based. Don't just skim the IMC and IFGC — look up the specific sections that appear in the topic list (combustion air, duct insulation, pipe sizing) and read them carefully.

Use timed practice. You have 3 minutes per question, which feels like a lot until it isn't. Practicing under time pressure conditions your pacing for the real test.

Don't ignore safety. Three items doesn't sound like much, but a missed point is still a missed point. The LOTO procedure, P.A.S.S. method, and GHS labeling requirements are straightforward and easy to lock in with a quick review.

Frequently Asked Questions

How many questions are on the Oklahoma HVACR Journeyman Limited exam?
The exam has 60 scored questions. You have 180 minutes to complete it.

What score do I need to pass?
You need a 70% — that's 42 correct answers out of 60 scored questions.

What's the best way to prepare for the exam?
Start with the official code books (IMC and IFGC) and a solid HVACR textbook like Modern Refrigeration and Air Conditioning. Then reinforce your knowledge with timed practice questions. Start with the free exam to gauge where you stand, then move to full practice sessions that mirror the real exam format.

Is the free practice exam enough to pass?
The free exam gives you 10 questions per attempt and is a good starting point for understanding the format and question style. For serious preparation, the full practice exam — which matches the real exam's 60-question format, topic breakdown, and time limit — gives you the depth and variety you need.

Can I retake the free practice exam?
Yes. The free exam can be retaken as many times as you like, no account or payment required. It draws from a limited question pool, so use it to warm up, then invest in the full exam for comprehensive prep.

Ready to Pass the Oklahoma HVACR Journeyman Exam?

This exam is thorough, but it's very passable with focused preparation. The content isn't designed to trick you — it's designed to confirm that you understand the systems you'll be working on in the field. Use the right code books, build your calculation skills, and get real practice under timed conditions.

Start today: take the free practice exam and see where you stand. Ten questions, no account needed, no pressure — just a clear picture of what you know and where to focus next. When you're ready to go deeper, the full practice exam is there to take your prep the rest of the way.