Commercial Refrigeration Training

Lesson 1 • Refrigerants: Properties and Classification

Identifies refrigerant families, their thermodynamic properties, and environmental impact ratings. Prepares technicians to select and handle refrigerants correctly.

Lesson 2 • The Refrigeration Cycle Explained

Traces the vapour-compression cycle through each stage from evaporation to condensation. Links thermodynamic theory to physical system components.

Lesson 3 • Heat Transfer and Thermodynamic Basics

Covers conduction, convection, and radiation as they apply to cooling systems. Establishes the physical foundation for all subsequent refrigeration concepts.

Lesson 1 • Evaporators and Cooling Coils

Describes evaporator coil designs for walk-in coolers, display cases, and reach-in units. Explains how evaporator sizing affects temperature pull-down and humidity.

Lesson 2 • Condensers and Heat Rejection

Covers air-cooled, water-cooled, and evaporative condenser designs and their operating conditions. Links condenser performance to overall system efficiency.

Lesson 3 • Expansion Devices and Flow Control

Analyses thermostatic expansion valves, electronic expansion valves, and fixed orifice devices. Demonstrates how flow control affects evaporator performance.

Lesson 4 • Refrigerant Piping and Accessories

Covers suction, discharge, and liquid line sizing along with essential accessories. Proper piping design prevents oil return issues and pressure losses.

Lesson 1 • Reading Wiring Diagrams and Schematics

Teaches ladder diagrams, pictorial wiring diagrams, and schematic symbols specific to refrigeration. Accurate diagram reading is essential for efficient troubleshooting.

Lesson 2 • Motors, Contactors, and Starters

Examines single-phase and three-phase motors, contactors, and motor starters used in compressors and fans. Covers starting methods and overload protection.

Lesson 3 • Electrical Safety and Basic Concepts

Reviews voltage, current, resistance, and power as applied to refrigeration equipment. Establishes lockout/tagout and personal protective equipment protocols.

Lesson 4 • Electronic Control Boards and Diagnostics

Introduces microprocessor-based controllers and their diagnostic outputs. Prepares technicians to interpret fault codes and use digital multimeters effectively.

Lesson 1 • Recovery Equipment and Procedures

Covers recovery machine operation, cylinder handling, and required vacuum levels by refrigerant type. Proper recovery prevents refrigerant release and equipment damage.

Lesson 2 • Refrigerant Safety and First Aid

Addresses physiological hazards of refrigerant exposure including frostbite, asphyxiation, and toxicity. Prepares technicians to respond to accidental releases.

Lesson 3 • Refrigerant Charging Techniques

Demonstrates vapour and liquid charging methods and the use of manifold gauge sets. Correct charge levels are critical to system efficiency and component longevity.

Lesson 4 • Regulatory Requirements for Refrigerant Handling

Outlines certification requirements and environmental regulations governing refrigerant use. Compliance protects technicians from liability and reduces environmental harm.

Lesson 1 • Walk-In Cooler and Freezer Construction

Covers insulated panel systems, door hardware, and floor construction for walk-in units. Proper construction minimises heat gain and prevents moisture infiltration.

Lesson 2 • Rack Refrigeration Systems

Introduces parallel compressor rack systems used in supermarkets and large foodservice operations. Covers suction group configuration and electronic rack controllers.

Lesson 3 • Food Safety Temperature Requirements

Links refrigeration performance to food safety temperature standards for perishable products. Technicians understand how equipment failures translate to food safety risks.

Lesson 4 • Open and Closed Display Case Operation

Compares multi-deck open cases, coffin cases, and glass-door reach-in units. Explains airflow curtain design and its role in maintaining product temperature.

Lesson 1 • Initial Startup and Control Setup

Guides technicians through energising the system, setting control parameters, and verifying operation. Correct initial settings establish baseline performance for future comparison.

Lesson 2 • System Evacuation Procedures

Details deep vacuum procedures using micron gauges to remove moisture and non-condensables. Proper evacuation is the single most important step for long system life.

Lesson 3 • Pre-Startup Inspection and Verification

Establishes a systematic checklist for verifying mechanical, electrical, and refrigerant connections before energising. Prevents costly startup failures and equipment damage.

Lesson 1 • Diagnosing Refrigerant System Faults

Uses pressure, temperature, and superheat readings to identify overcharge, undercharge, and restriction faults. Connects abnormal readings to specific component failures.

Lesson 2 • Defrost and Temperature Fault Diagnosis

Identifies causes of inadequate defrost, excessive frost buildup, and temperature drift in display cases. Links defrost faults to food safety and energy waste.

Lesson 3 • Systematic Troubleshooting Methodology

Introduces a structured fault-isolation process using symptom analysis and elimination. A repeatable method prevents misdiagnosis and unnecessary part replacement.

Lesson 4 • Electrical and Control Fault Diagnosis

Applies voltage, continuity, and resistance testing to isolate electrical failures in controls and motors. Covers intermittent fault strategies and control board testing.

Lesson 1 • Condenser and Evaporator Coil Maintenance

Details cleaning methods, inspection criteria, and performance benchmarks for heat exchanger coils. Clean coils are the highest-impact maintenance task for energy efficiency.

Lesson 2 • Controls and Sensor Calibration

Verifies accuracy of temperature sensors, pressure controls, and electronic controllers during PM visits. Calibration drift causes energy waste and food safety risks.

Lesson 3 • Maintenance Planning and Scheduling

Establishes frequency-based and condition-based maintenance strategies for commercial refrigeration. Proper scheduling balances labour cost against equipment reliability goals.

Lesson 4 • Compressor and Motor Maintenance

Covers oil level checks, vibration analysis, belt and coupling inspection, and electrical testing. Proactive compressor care prevents the most expensive refrigeration failures.