Power Engineer with 15+ years of experience in pulp and paper, power generation, and oil & gas processing facilities. Operating Manager at Power Engineering 101, helping students prepare for Canadian power engineering certification exams.
Somewhere in Canada right now, an operator is watching over a refrigeration system keeping a food processing plant at temperature, an ice arena ready for the next game, or a pharmaceutical facility within its required storage range. That person holds a refrigeration operator certificate of qualification, a provincially regulated credential that authorizes them to be the person legally in charge of an industrial refrigeration plant.
This certification sits within the power engineering and operating engineer system, which means it is about running a stationary plant safely, not installing or servicing equipment in the field.
There are two levels: class B, which most candidates pursue first, and class A, which opens the door to larger plants and higher-paying roles. Requirements are set by each province, but the exam syllabus is standardized nationally through SOPEEC.
The following article covers the full certification process across Canada: class B and class A exam requirements, province-by-province details, salary ranges, and how to prepare with Power Engineering 101. So keep reading.
What does a refrigeration operator do?
Refrigeration operators oversee large-scale refrigeration systems in industrial and commercial settings. Their day-to-day responsibilities include monitoring system pressures and temperatures, performing routine maintenance on compressors, condensers, evaporators, and pumps, troubleshooting equipment faults, maintaining logbooks, and following safety protocols for working with refrigerants such as ammonia, CO2, and HFCs.
Industries that regularly employ refrigeration operators include:
- Food processing and cold storage facilities
- Ice arenas and curling rinks
- Pharmaceutical and biotech facilities
- Petrochemical and industrial plants
- Commercial buildings and data centres
- Hospitals and healthcare facilities
How a refrigeration system works
Understanding the basics helps you see why operators are essential. A vapour compression refrigeration system removes heat from a space or product by cycling a refrigerant through four stages:
- Compression: the compressor raises the refrigerant gas to high pressure and temperature.
- Condensation: the condenser releases heat to the environment, turning the refrigerant into a liquid.
- Expansion: the metering device drops the pressure, causing the refrigerant to cool rapidly.
- Evaporation: the evaporator absorbs heat from the space being cooled, and the cycle repeats.
Refrigeration operators monitor and control each stage of this cycle to keep systems running safely and efficiently. Even a small deviation in pressure or temperature can lead to equipment damage, product loss, or a safety incident, which is why provincial certification is mandatory for plants above a certain capacity.
Class B vs. class A refrigeration operator: what is the difference?
The two certification levels determine what type and size of plant you are authorized to supervise. Class B is the entry-level certificate; class A authorizes oversight of larger, more complex systems and typically comes with higher pay and more responsibility
| Class B refrigeration operator | Class A refrigeration operator | |
| Plant authorization | Class B and Class A refrigeration plants | Class A refrigeration plants (the highest classification) |
| Responsibility | Operator in charge of a class B plant; may assist in a class A plant | Operator or chief engineer in a Class A plant |
| Prerequisite (Ontario) | None, you can write the class B exam without a prior certificate | Class B certificate or 3rd class power engineer certificate |
| Typical industries | Ice arenas, cold storage, food processing, and smaller industrial plants | Large industrial refrigeration, ammonia systems, and petrochemical plants |
| Salary range | Approx. $55,000–$75,000/year | Approx. $70,000–$90,000+/year |
How to become a refrigeration operator in Canada?
The certification process follows the same general path in most Canadian provinces, though the specific hours, exam formats, and regulatory bodies differ. Here is the typical sequence:
Step 1: Gain practical experience in a refrigeration plant
Before you can apply for a certificate of qualification, you need to accumulate a set number of hours working in a registered, attended refrigeration plant under the supervision of a licensed operating engineer or operator. The required hours depend on the certification class and the province.
Step 2: Complete a recognized training course (optional but recommended)
You are not required to complete a formal course before writing the exam, but completing one has two advantages: it reduces the required practical hours, and it significantly improves your exam results.
Power Engineering 101 offers a Refrigeration Plant Operator A course that follows the SOPEEC syllabus and is designed to prepare you for the provincial exam. For class B candidates who want to test their readiness before the exam, the Refrigeration Plant Operator B practice exam generates randomized 100-question practice tests aligned to the exam syllabus.
Step 3: Write the certification exam
Once you meet the eligibility requirements, you apply to your province’s safety authority to write the exam. The exam format, number of questions, and time limit vary by province and class level. See the exam details section below for specifics.
Step 4: Apply for your certificate of qualification
After passing the exam and completing the required practical hours, you submit your application to your provincial authority along with a testimonial of qualifying experience signed by your chief operating engineer and the applicable fee. Your certificate of qualification is then issued and is valid as long as you keep it in good standing.
Note: In Ontario, TSSA requires that you obtain your certificate within five years of passing your exam. If you wait longer, you will need to rewrite.
Refrigeration operator class B certification requirements (Ontario)
In Ontario, the Technical Standards and Safety Authority (TSSA) governs refrigeration operator certification under the Operating Engineers Regulation (Ontario Regulation 219/01).
The following details are sourced directly from the TSSA Class B Certification and Examination Guide.
Practical experience requirement
- 1,440 hours as a trainee in a class A or class B refrigeration plant
- 1,280 hours if you have completed a full-time TSSA-approved time-reduction refrigeration B program
Since June 14, 2021, you have the option to pursue your exam and accumulate your experience hours at the same time, rather than completing one before the other.
Class B exam format (Ontario)
| Detail | Class B (Ontario/TSSA) |
| Format | 150 multiple-choice questions |
| Duration | 3.5 hours |
| Passing mark | 65% |
| Rewrite policy | Allowed after 60 days |
| Prerequisite | None, you can write at any time once eligible |
| Exam locations | Ministry of Labour exam centres or TSSA-approved centres |
Class B exam topics
The TSSA class B syllabus covers the following subject areas:
- Acts, regulations, and codes (including the Technical Standards and Safety Act, CSA B52: Mechanical Refrigeration Code, and CSA Z94.4)
- Safety: gas detection, exposure limits, personal protective equipment, confined space, fire protection
- Administration: mechanical drawing, maintenance planning, materials and welding
- Refrigeration fundamentals: thermodynamic principles, refrigerants (CFCs, HCFCs, HFCs), vapour compression and absorption cycles
- Pumps and compressors: types of compressors, prime movers, hermetic vs. open-type designs
- Controls and instrumentation: metering devices, safety controls, piping, receivers
- Condensers and cooling towers: air-cooled, water-cooled, and evaporative types
- Evaporators and cooling coils: construction types, chillers, thermal storage
- Operation and maintenance: startup/shutdown procedures, leak testing, defrosting, oil removal
- Electrical: circuit breakers, relays, motor starters
- Air conditioning: psychrometrics, air conditioning systems, Legionella risks
- Mathematics and science: basic refrigeration calculations, including compression capacity, system tonnage, and CSA B52 calculations
The Power Engineering 101 Refrigeration Plant Operator B practice exam generates randomized exams aligned to these topics, with detailed feedback after each attempt so you can identify and address weak areas before the real exam.
Refrigeration operator class A certification requirements (Ontario)
The Class A certificate authorizes you to act as the operator in charge of a Class A refrigeration plant, which is the highest plant classification in Ontario. The following details are sourced from the TSSA Class A Certification and Examination Guide, effective October 2024.
Prerequisites
To write the class A exam, you must first hold one of the following:
- Refrigeration operator class B certificate•
- 3rd class power engineer certificate or higher
Practical experience requirement
- 1,920 hours in a class A refrigeration plant•
- 1,760 hours if you have completed a full-time TSSA-approved time-reduction refrigeration training program
Class A exam format (Ontario)
| Detail | Class A (Ontario/TSSA) |
| Format | 100 multiple-choice questions |
| Duration | 3 hours |
| Passing mark | 65% |
| Rewrite policy | Allowed after 60 days |
Important: the class A exam format changed in January 2025. It was previously a written (essay-style) exam. As of January 1, 2025, there are now 100 multiple-choice questions. If you have study materials that reference the older format, make sure they are current. The Power Engineering 101 Refrigeration Plant Operator A course is built around the SOPEEC syllabus and includes practice exams that reflect the current multiple-choice format.
Class A exam topics
The class A examination builds on all class B knowledge and adds:
- Advanced acts, regulations, and codes: Technical Standards and Safety Act, CSA B52 and B51, CEPA E2 Environmental Emergency Regulations
- Safety: detailed hazard management for refrigeration plants
- Operation and management: system operation, auxiliaries, pumps and compressors, basic electricity and lubrication principles
- Advanced refrigerants, processes, and systems: halocarbons, azeotropes, steam-jet, air-cycle, and absorption systems, hermetic centrifugal machines
- Industrial systems: multi-stage and cascade refrigeration, purge systems, liquid receivers, operating, and troubleshooting
- Thermodynamics and calculations: reversed Carnot cycle, pressure-enthalpy charts, coefficient of performance, refrigerating effect, piston displacement, tonnes of refrigeration
Refrigeration operator certification by province
Not all Canadian provinces and territories recognize the refrigeration operator certification. The table below includes only the provinces where a recognized equivalent exists, based on the TSSA Labour Mobility Matched Equivalency document. Provinces and territories not listed, including Alberta, New Brunswick, Yukon, Northwest Territories, and Nunavut, do not have a recognized equivalent to Ontario’s Refrigeration Operator Class A or Class B certificate.
If your province is not listed, contact your local safety authority directly to confirm what certification requirements apply in your jurisdiction.
| Province | Regulatory authority | Certificate name | Key notes |
| Ontario | TSSA (Technical Standards and Safety Authority) | Refrigeration Operator Class B / Class A | Class B: 150 questions, 3.5 hrs. Class A: 100 questions, 3 hrs (from Jan 2025). 65% pass. See tssa.org. |
| British Columbia | Technical Safety BC (TSBC) | Refrigeration Operator Certificate | Recognized equivalent to Ontario’s Class B only: Power Engineer 5th class refrigeration endorsement. No recognized equivalent to Class A. 100 questions, 3 hrs, 65% pass. Three attempts allowed. See technicalsafetybc.ca. |
| Saskatchewan | TSASK (Technical Safety Authority of Saskatchewan) | Refrigeration Operator | Recognized equivalent to Ontario’s Class B only: Refrigeration Operator. No recognized equivalent to Class A. The SOPEEC syllabus applies. See tsask.ca. |
| Manitoba | Trades Examination, Certification and Licensing, Labour and Immigration | Refrigeration Operator | Recognized equivalent to Ontario’s Class B only: Refrigeration Operator. No recognized equivalent to Class A. The Manitoba Power Engineers Act governs. Confirm current requirements with the provincial authority. |
| Nova Scotia | Department of Labour, Skills and Immigration (Technical Safety Act) | Refrigeration Plant Operator Licence: 1st class / 2nd class | Class A equivalent: Refrigeration 1st class. Class B equivalent: Refrigeration 2nd class. Grade 12 required. Provincial exam administered through the Nova Scotia Apprenticeship Agency. |
| Newfoundland and Labrador | Apprenticeship and Trades Certification Division (ATCD) | Refrigeration Operator A / B (Certificate of Competency) | Class A equivalent: Refrigeration A. Class B equivalent: Refrigeration B. Certification required under the ATCD. See gov.nl.ca/atcd. |
| Prince Edward Island | PEI Inspection Services (Boilers and Pressure Vessels Act) | Refrigeration Operator Class A / Class B | Class A equivalent: Refrigeration A. Class B equivalent: Refrigeration B. Confirm current requirements with PEI Inspection Services. |
| Quebec | CNESST | Class A (MMFA) / Class B (MMFB) | Class A equivalent: Class A (MMFA). Class B equivalent: Class B (MMFB). Confirm current requirements with the provincial authority. |
Always verify current requirements directly with your provincial authority before you begin, as hours and exam formats can change.
How to prepare for the refrigeration operator exam
Most candidates who struggle with the exam do so not because the material is too advanced, but because they underestimate the breadth of the syllabus. The exam covers everything from the Mechanical Refrigeration Code to psychrometrics to ammonia safety, across 12 subject areas for class B alone.
Study resources from Power Engineering 101:
Power Engineering 101 offers two dedicated resources for refrigeration operator candidates:
- Refrigeration Plant Operator B practice exam: a monthly subscription that generates randomized 100-question exams from a question bank aligned to the SOPEEC syllabus. Each attempt gives you a full breakdown of correct and incorrect answers. Candidates are generally exam-ready when they can consistently score 80% or above without memorizing the questions.
- Refrigeration Plant Operator A course: a self-paced course with seven study guides, practice exams, and unlimited 1-on-1 tutor support. Six months of access with free reactivations and a guaranteed exam success policy. Covers terminology, legislation, thermodynamics, industrial systems, and refrigeration calculations.
Recommended textbooks:
The TSSA recommends the PanGlobal Refrigeration Operator series as the primary study material for both class B and class A. You will also need:
- CSA B52: Mechanical Refrigeration Code
- CSA B51: Boilers and Pressure Vessels Code (for class A)
- The Technical Standards and Safety Act and the Operating Engineers Regulation.
Study tips
- Start with the TSSA exam guide for your class (B or A) and use the syllabus as your study checklist
- Do not skip the calculations section; refrigeration tonnage, compression capacity, and CSA B52 calculations appear on both exams
- Practice with timed exams to get used to the 3.5-hour (class B) or 3-hour (class A) time constraint
- If you score below 80% on practice exams consistently, consider the Power Engineering 101 tutorial course before sitting the provincial exam
Refrigeration Operator Salary in Canada
Compensation for refrigeration operators varies by certification class, province, industry, and years of experience. Class A operators command higher wages because they are authorized to oversee larger, more complex systems. Alberta and Ontario generally offer higher pay due to demand from industrial and food processing sectors.
| Entry level | Experienced | Senior / class A | |
| Approximate annual salary | $50,000–$60,000 | $65,000–$80,000 | $80,000–$95,000+ |
According to the Government of Canada Job Bank wage data, refrigeration technicians in Canada typically earn between $21 and $55 per hour, depending on region and specialization. Industrial refrigeration operators working in ammonia systems or large food processing facilities tend to sit at the higher end of this range, particularly in Ontario and Alberta.
Additional certifications, such as a power engineer class certificate, can also increase earning potential, as some employers require or prefer candidates who hold both qualifications.
Where refrigeration operators work
Refrigeration operators are employed across a wide range of industries wherever large-scale refrigeration is critical to operations:
- Food processing and cold storage: meat processing plants, dairy facilities, produce distribution centres, and freezer warehouses depend on continuous refrigeration. This is one of the largest employers of class B and class A operators in Canada.
- Ice arenas and recreation facilities: arenas require year-round refrigeration operation, and many municipalities require class B certification or higher for the operator in charge.
- Pharmaceutical and life sciences: vaccines, biologics, and temperature-sensitive medications require precise refrigeration management.
- Petrochemical and industrial plants: refrigeration is used in process cooling and in maintaining stable conditions during production.
- Hospitals and healthcare facilities: medical refrigeration for specimen storage, blood banks, and operating room cooling systems.
- Commercial buildings and facility management: large HVAC and chilled water systems in office towers, data centres, and hotels often require a licensed refrigeration operator
Refrigeration Operators FAQ
Can I write the refrigeration operator class B exam without any previous certification?
Is a refrigeration operator the same as a power engineer?
However, holding a refrigeration operator certificate does not make you a licensed power engineer, and vice versa. You can read more about power engineering certification in our how to become a power engineer guide.
I want to become a refrigeration operator, although I hold a bachelor degree in petroleum engineering, how do I get through and what courses do I require to achieve this.