Refrigeration Technician Course

Lesson 1 • Laws of Thermodynamics

Explains the first and second laws and their direct implications for refrigeration efficiency. Provides the theoretical framework for evaluating system performance.

Lesson 2 • The Vapor-Compression Refrigeration Cycle

Traces refrigerant flow through compression, condensation, expansion, and evaporation stages. Connects thermodynamic theory to the standard mechanical cycle used in most systems.

Lesson 3 • Heat Transfer Principles

Covers conduction, convection, and radiation as they apply to refrigeration. Establishes the physical basis for all heat-removal processes studied throughout the course.

Lesson 4 • Refrigerants: Properties and Selection

Examines refrigerant classifications, thermodynamic properties, and environmental impact ratings. Prepares technicians to select appropriate refrigerants for specific system requirements.

Lesson 1 • Auxiliary Components and Accessories

Identifies receivers, accumulators, filter-driers, sight glasses, and oil separators and their roles. Reinforces system reliability by explaining how accessories protect core components.

Lesson 2 • Condensers and Heat Rejection

Examines air-cooled, water-cooled, and evaporative condensers and their heat-rejection mechanisms. Links condenser sizing to ambient conditions and system efficiency.

Lesson 3 • Expansion Devices

Covers thermostatic expansion valves, electronic expansion valves, and fixed orifice devices. Explains how each device regulates refrigerant flow and maintains superheat.

Lesson 4 • Compressor Types and Operation

Covers reciprocating, scroll, screw, and centrifugal compressors, including operating principles and application ranges. Connects compressor selection to system capacity and efficiency goals.

Lesson 1 • Refrigerant Charging Procedures

Explains liquid and vapor charging methods, manifold gauge set use, and charge verification techniques. Ensures technicians can achieve correct system charge without overcharging or undercharging.

Lesson 2 • Refrigerant Safety and Hazards

Covers toxicity, flammability, asphyxiation risks, and required personal protective equipment for each refrigerant class. Establishes the safety mindset required before any hands-on refrigerant work.

Lesson 3 • Recovery, Recycling, and Reclaiming

Teaches the distinctions among recovery, recycling, and reclaiming and the equipment used for each process. Connects proper refrigerant management to regulatory compliance and cost control.

Lesson 4 • System Evacuation and Dehydration

Covers vacuum pump selection, micron gauge use, and triple-evacuation procedures to remove moisture and non-condensables. Prepares technicians to achieve the deep vacuum required before charging.

Lesson 1 • Reading Wiring Diagrams and Schematics

Teaches ladder diagrams, pictorial wiring diagrams, and component symbols used in refrigeration equipment. Enables technicians to trace circuits and identify control logic before testing.

Lesson 2 • Thermostats, Pressostats, and Safety Controls

Explains how thermostats, high/low pressure switches, and safety cutouts protect refrigeration systems. Reinforces the link between control settings and system operating limits.

Lesson 3 • Motors and Motor Controls

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

Lesson 4 • Electrical Testing and Measurement

Covers multimeter, clamp meter, and megohmmeter use for voltage, current, resistance, and insulation testing. Prepares technicians to confirm electrical integrity before and after repairs.

Lesson 1 • Electrical Connections and Wiring

Explains power supply verification, disconnect sizing, wire gauge selection, and control wiring termination. Ensures electrical installation meets equipment ratings and safety standards.

Lesson 2 • System Startup and Performance Verification

Guides technicians through pre-startup checklists, initial charge verification, and performance data recording. Confirms the system meets design conditions before handover to the customer.

Lesson 3 • Pressure Testing and Leak Detection

Covers nitrogen pressure testing, electronic leak detector use, and UV dye methods to confirm system integrity. Establishes leak-free status before refrigerant is introduced.

Lesson 4 • Refrigerant Piping and Brazing

Teaches pipe sizing, line set routing, brazing technique with nitrogen purge, and insulation application. Proper piping prevents oil return problems and refrigerant pressure drop.

Lesson 1 • Refrigerant System Fault Diagnosis

Covers diagnosis of overcharge, undercharge, non-condensables, moisture contamination, and restriction faults using gauge readings and temperature data.

Lesson 2 • Airflow and Heat Transfer Faults

Diagnoses condenser and evaporator airflow restrictions, dirty coils, fan motor failures, and defrost system malfunctions. Links airflow problems to abnormal pressure and temperature readings.

Lesson 3 • Systematic Troubleshooting Methodology

Introduces a structured diagnostic process: gather information, identify symptoms, form hypotheses, and test. Prevents random part replacement and reduces diagnostic time.

Lesson 4 • Electrical and Control Fault Diagnosis

Covers diagnosis of failed contactors, capacitors, relays, thermostats, and pressure switches using systematic electrical testing. Reinforces wiring diagram skills from the electrical chapter.

Lesson 1 • Coil Cleaning and Airflow Maintenance

Teaches condenser and evaporator coil cleaning methods, fin straightening, and drain pan maintenance. Restores heat transfer efficiency and prevents biological growth in drain systems.

Lesson 2 • Mechanical Inspection Procedures

Details inspection of compressors, belts, bearings, vibration isolators, and refrigerant piping for wear and leaks. Establishes the physical inspection sequence used on every maintenance visit.

Lesson 3 • Electrical System Maintenance

Covers tightening electrical connections, testing contactors and capacitors, and verifying control setpoints during scheduled visits. Prevents electrical failures that cause compressor damage.

Lesson 4 • Maintenance Documentation and Reporting

Explains service report completion, trend analysis from logged data, and customer report presentation. Enables technicians to demonstrate value and identify deteriorating equipment early.

Lesson 1 • Building Automation and Remote Monitoring

Covers integration of refrigeration systems with building automation, remote monitoring platforms, and alarm management. Prepares technicians to use digital tools for proactive system management.

Lesson 2 • Supermarket Refrigeration Systems

Covers multiplex rack systems, display case circuits, electronic controls, and energy management in supermarket applications. Builds on single-circuit knowledge to address multi-circuit complexity.

Lesson 3 • Parallel Compression and Economizers

Explains parallel compression, flash economizers, and subcooling circuits used to improve efficiency in large systems. Connects advanced cycle modifications to measurable energy savings.

Lesson 4 • Cold Storage and Warehouse Refrigeration

Examines large evaporator coil systems, ammonia and CO2 refrigerant applications, and blast freezing operations. Addresses the scale and safety requirements unique to industrial cold storage.