Refrigeration Course

Lesson 1 • Refrigeration Terminology and Units

Defines industry-standard terms including tons of refrigeration, BTU, and COP. Ensures accurate communication throughout the course.

Lesson 2 • Pressure and Gas Laws

Introduces Boyle's, Charles's, and Dalton's laws for gas behaviour. Provides the pressure-temperature foundation for refrigerant analysis.

Lesson 3 • Principles of Heat Transfer

Examines conduction, convection, and radiation as they apply to refrigeration equipment. Connects heat movement to system efficiency.

Lesson 4 • Heat and Temperature Basics

Covers sensible heat, latent heat, and temperature scales. Establishes the thermal concepts required for all subsequent refrigeration study.

Lesson 1 • Condensers: Types and Performance

Covers air-cooled, water-cooled, and evaporative condensers. Links condenser design to heat rejection efficiency and system head pressure.

Lesson 2 • Compressor Types and Operation

Examines reciprocating, scroll, rotary, and screw compressors. Establishes how compression raises refrigerant pressure and temperature.

Lesson 3 • Auxiliary Components and Accessories

Reviews filter-driers, sight glasses, accumulators, and oil separators. Shows how accessories protect system reliability and refrigerant quality.

Lesson 4 • Evaporators: Design and Function

Describes direct-expansion and flooded evaporator configurations. Connects evaporator performance to refrigeration load and airflow.

Lesson 1 • Safe Refrigerant Handling Procedures

Covers PPE selection, cylinder safety, and leak response protocols. Directly reduces risk of injury and environmental release during service.

Lesson 2 • Refrigerant Recovery, Recycling, and Reclaim

Distinguishes recovery, recycling, and reclaim processes and equipment requirements. Ensures compliant refrigerant management at end of service.

Lesson 3 • Thermodynamic Properties of Refrigerants

Analyses pressure-enthalpy diagrams and saturation tables for common refrigerants. Connects property data to cycle performance calculations.

Lesson 4 • Environmental and Safety Regulations

Reviews ozone depletion, global warming potential, and regulatory phase-down requirements. Prepares technicians for compliant refrigerant management.

Lesson 1 • Reading Wiring Diagrams

Teaches schematic, ladder, and pictorial diagram interpretation. Enables technicians to trace circuits and verify correct wiring during installation and service.

Lesson 2 • Motors and Motor Protection

Examines single-phase and three-phase motors, starting components, and overload protection. Connects motor selection to compressor and fan applications.

Lesson 3 • Electrical Troubleshooting Techniques

Applies multimeter and clamp-meter diagnostics to refrigeration electrical faults. Integrates electrical knowledge with systematic fault isolation.

Lesson 4 • Control Devices and Switches

Identifies thermostats, pressure switches, time-delay relays, and contactors. Explains how each device governs system start, stop, and safety functions.

Lesson 1 • Piping Design and Fabrication

Addresses copper and steel pipe sizing, routing, and brazing techniques. Correct piping ensures oil return, minimal pressure drop, and leak-free joints.

Lesson 2 • Refrigerant Charging Procedures

Covers charging by weight, sight glass, and superheat/subcooling methods. Correct charge level is critical to efficiency and equipment longevity.

Lesson 3 • Evacuation and Dehydration

Explains deep vacuum procedures, micron gauge use, and triple evacuation. Removes moisture and non-condensable gases that degrade system performance.

Lesson 4 • System Startup and Commissioning

Details pre-startup checks, initial run verification, and performance documentation. Confirms the installed system operates within design specifications.

Lesson 1 • Compressor Fault Diagnosis

Identifies mechanical and electrical compressor failures through performance testing. Prevents unnecessary compressor replacement by confirming root cause.

Lesson 2 • Refrigerant Circuit Fault Analysis

Diagnoses overcharge, undercharge, restriction, and non-condensable contamination. Applies PT analysis to isolate faults within the refrigerant circuit.

Lesson 3 • Electrical and Control Fault Diagnosis

Traces electrical faults in motor circuits, control boards, and safety devices. Integrates electrical skills from Chapter 4 into refrigeration-specific diagnostics.

Lesson 4 • Pressure-Temperature Analysis

Uses PT charts to identify abnormal operating conditions in the refrigerant circuit. Connects pressure and temperature readings to specific component faults.

Lesson 1 • Mechanical Maintenance Procedures

Details compressor oil checks, belt tension, fan blade inspection, and vibration analysis. Prevents mechanical failures through systematic component inspection.

Lesson 2 • Refrigerant Circuit Maintenance

Addresses leak checks, filter-drier replacement intervals, and refrigerant charge verification. Maintains refrigerant integrity and system efficiency over time.

Lesson 3 • Performance Trending and Analysis

Uses logged operating data to detect performance degradation before failure occurs. Connects trend analysis to proactive maintenance decision-making.

Lesson 4 • Heat Exchanger Cleaning and Care

Covers condenser coil cleaning, evaporator defrost verification, and water treatment for cooling towers. Restores heat transfer efficiency and prevents corrosion.

Lesson 1 • System Optimisation and Energy Management

Applies floating head pressure, demand defrost, and variable-speed drives to reduce energy use. Integrates efficiency strategies across all system types studied.

Lesson 2 • Commercial Refrigeration Equipment Types

Surveys walk-in coolers, display cases, reach-in units, and ice machines. Establishes the equipment landscape technicians encounter in commercial settings.

Lesson 3 • Industrial Refrigeration Fundamentals

Introduces ammonia systems, large-tonnage chillers, and industrial process cooling. Highlights differences in scale, refrigerant, and safety requirements.

Lesson 4 • Chiller Systems and Controls

Covers centrifugal, screw, and absorption chillers along with building automation integration. Connects chiller operation to HVAC and process cooling applications.