Refrigeration Course

Lesson 1 • Heat Transfer and Thermodynamic Principles

Covers conduction, convection, and radiation as they apply to cooling systems. Establishes the physical laws that underpin every refrigeration process.

Lesson 2 • The Basic Refrigeration Cycle

Introduces the vapour-compression cycle and its four fundamental stages. Provides the conceptual framework for all subsequent system study.

Lesson 3 • Refrigerants: Properties and Classification

Surveys refrigerant families, numbering systems, and key physical properties. Prepares students to select appropriate refrigerants for given applications.

Lesson 1 • Condensers and Heat Rejection Devices

Covers air-cooled, water-cooled, and evaporative condensers. Explains how condenser design affects system head pressure and efficiency.

Lesson 2 • Compressors: Types and Operation

Examines reciprocating, scroll, screw, and centrifugal compressors. Links compressor selection to system capacity and efficiency requirements.

Lesson 3 • Auxiliary Components and Accessories

Covers receivers, accumulators, oil separators, and filter-driers. Shows how accessories protect system reliability and refrigerant quality.

Lesson 4 • Evaporators and Cooling Coils

Describes direct-expansion and flooded evaporator designs and their applications. Connects evaporator performance to refrigerating effect and load matching.

Lesson 1 • Regulatory Requirements for Refrigerant Use

Outlines certification requirements, phase-down schedules, and record-keeping obligations. Connects regulatory compliance to professional licensing and environmental responsibility.

Lesson 2 • Refrigerant Recovery and Reclaim Procedures

Teaches push-pull recovery, vapour recovery, and liquid recovery techniques. Ensures students can remove refrigerant without atmospheric release.

Lesson 3 • Refrigerant Safety and Hazard Awareness

Identifies toxicity, flammability, and asphyxiation risks associated with common refrigerants. Establishes the safety mindset required before any hands-on work.

Lesson 1 • Motors, Starters, and Contactors

Covers single-phase and three-phase motor types, starting methods, and protection devices. Connects motor selection and protection to compressor and fan reliability.

Lesson 2 • Electrical Fundamentals for Technicians

Reviews voltage, current, resistance, and power as applied to refrigeration circuits. Provides the electrical foundation needed for safe equipment work.

Lesson 3 • Control Devices and Safety Switches

Examines thermostats, pressure switches, time-delay relays, and defrost controls. Shows how control devices protect equipment and maintain setpoints.

Lesson 4 • Reading Wiring Diagrams and Schematics

Teaches ladder diagrams, pictorial wiring diagrams, and schematic symbols. Enables students to trace circuits and identify component relationships.

Lesson 1 • Brazing and Soldering Techniques

Develops silver brazing and soft soldering skills for leak-free refrigerant joints. Nitrogen purging during brazing prevents oxidation and system contamination.

Lesson 2 • System Evacuation and Dehydration

Explains triple evacuation, deep vacuum procedures, and micron gauge use. Moisture removal is critical to preventing acid formation and compressor failure.

Lesson 3 • Pressure Testing and System Startup

Covers standing pressure tests with nitrogen and initial system startup checks. Validates installation integrity before refrigerant is introduced.

Lesson 4 • Copper Tubing and Pipe Sizing

Teaches ACR tubing selection, pipe sizing for suction and liquid lines, and pressure drop calculations. Proper sizing prevents capacity loss and oil return problems.

Lesson 1 • Compressor Fault Diagnosis

Covers electrical and mechanical compressor failures including valve, bearing, and winding faults. Accurate compressor diagnosis prevents unnecessary replacement.

Lesson 2 • Diagnostic Methodology and Tools

Introduces the five-step diagnostic process and essential measurement tools. A structured approach reduces diagnostic time and prevents misdiagnosis.

Lesson 3 • Diagnosing Expansion and Evaporator Faults

Identifies TXV hunting, restricted orifices, iced coils, and airflow deficiencies. Expansion and evaporator faults are among the most common field service issues.

Lesson 4 • Interpreting System Operating Pressures

Teaches reading suction and discharge pressures against expected values for given conditions. Pressure analysis is the primary tool for identifying refrigerant and mechanical faults.

Lesson 1 • Display Cases and Merchandisers

Examines open and closed display case types, anti-sweat heaters, and night curtains. Display case performance directly affects product quality and energy costs.

Lesson 2 • Walk-In Coolers and Freezers

Covers panel construction, door hardware, floor heating, and unit cooler selection. Walk-ins are the most common commercial refrigeration application.

Lesson 3 • Multiplex Rack Refrigeration Systems

Explains parallel compressor racks, suction groups, and electronic rack controllers. Rack systems serve multiple cases from a centralised plant.

Lesson 4 • Refrigeration Load Calculations

Teaches heat load estimation including transmission, infiltration, product, and equipment loads. Accurate load calculation ensures correct system sizing.

Lesson 1 • Preventive Maintenance Programme Design

Establishes maintenance intervals, task lists, and priority systems for refrigeration assets. A structured PM programme reduces emergency calls and extends equipment life.

Lesson 2 • Refrigerant System Checks

Performs leak checks, charge verification, and filter-drier condition assessment during PM visits. Refrigerant integrity checks protect the environment and system efficiency.

Lesson 3 • Service Reporting and Customer Communication

Teaches work order completion, deficiency reporting, and professional customer interaction. Clear documentation protects technicians and builds client trust.

Lesson 4 • Mechanical Maintenance Procedures

Details condenser coil cleaning, belt and bearing inspection, and compressor oil analysis. Mechanical maintenance prevents the most common causes of system failure.