AC Repair Course

Lesson 1 • Workplace Safety Practices

Covers electrical, chemical, and fall hazards common in AC work. Students apply hazard identification and risk mitigation on job sites.

Lesson 2 • Hand and Power Tools for AC Work

Introduces tools used daily by AC technicians and safe operating procedures. Proper tool use reduces injury risk and improves diagnostic accuracy.

Lesson 3 • Overview of the HVAC Trade

Introduces the scope of HVAC work, career pathways, and industry certifications. Establishes context for all technical skills taught throughout the course.

Lesson 4 • Regulatory Compliance Essentials

Explains environmental and safety regulations governing refrigerant handling and equipment disposal. Compliance knowledge prevents fines and protects technician certification.

Lesson 1 • Reading Wiring Diagrams

Teaches schematic and ladder diagram interpretation for residential and light commercial units. Diagram literacy is essential for systematic troubleshooting.

Lesson 2 • Electrical Components in AC Units

Identifies capacitors, contactors, relays, and transformers found in AC systems. Understanding component function enables accurate fault isolation.

Lesson 3 • Using a Multimeter Safely

Demonstrates voltage, resistance, and continuity testing with a digital multimeter. Safe meter use prevents equipment damage and technician injury.

Lesson 4 • Motor Electrical Diagnostics

Applies electrical theory to test compressor and fan motors for faults. Students distinguish winding failures from capacitor and contactor problems.

Lesson 1 • Psychrometrics and Comfort Conditions

Introduces humidity, dew point, and the psychrometric chart for evaluating indoor air conditions. Psychrometric data guides equipment sizing and airflow adjustments.

Lesson 2 • Common Refrigerant Types

Compares refrigerants used in residential and commercial AC systems, including low-GWP alternatives. Refrigerant selection affects handling procedures and system compatibility.

Lesson 3 • Refrigerant Properties and States

Covers refrigerant pressure-temperature relationships, saturation, and superheat/subcooling. Accurate state identification is required for correct system charging.

Lesson 4 • Heat Transfer Fundamentals

Explains conduction, convection, and radiation as they apply to cooling systems. Heat transfer principles underpin every diagnostic and performance evaluation task.

Lesson 1 • Metering Devices

Compares TXVs, fixed orifices, and electronic expansion valves for refrigerant flow control. Metering device selection and adjustment affect superheat and system efficiency.

Lesson 2 • Controls, Thermostats, and Safeties

Covers thermostat wiring, high-pressure and low-pressure switches, and freeze stats. Safety controls protect equipment and must be verified during every service call.

Lesson 3 • Compressor Types and Operation

Covers reciprocating, scroll, and rotary compressors used in residential and light commercial AC. Compressor knowledge is foundational for diagnosis and replacement decisions.

Lesson 4 • Condensers and Condenser Fans

Explains air-cooled condenser design, coil construction, and fan motor operation. Condenser performance directly affects system efficiency and head pressure.

Lesson 1 • Charging by Weight and Superheat

Applies manufacturer charging charts and refrigerant scales to achieve correct charge. Superheat method is used for fixed-orifice systems to prevent compressor flooding.

Lesson 2 • System Evacuation and Dehydration

Demonstrates deep vacuum procedures using a two-stage vacuum pump and micron gauge. Thorough evacuation removes moisture that causes acid formation and compressor failure.

Lesson 3 • Charging by Subcooling and Verification

Uses liquid-line subcooling measurement to charge TXV systems accurately. Final verification confirms system performance meets manufacturer specifications.

Lesson 4 • Manifold Gauge Set Operation

Teaches gauge set connection, zeroing, and reading high-side and low-side pressures. Accurate gauge readings are the starting point for every refrigerant service task.

Lesson 1 • Refrigerant System Fault Diagnosis

Uses pressure readings, superheat, and subcooling data to identify overcharge, undercharge, and restrictions. Refrigerant diagnosis requires mastery of Chapters 3 and 5.

Lesson 2 • Systematic Troubleshooting Methodology

Introduces a structured diagnostic process: gather information, isolate the system, test, and verify. A repeatable method reduces diagnostic time and misdiagnosis.

Lesson 3 • Diagnosing Electrical Faults

Applies multimeter and wiring diagram skills to locate open circuits, shorts, and failed components. Electrical diagnosis builds directly on Chapter 2 measurement techniques.

Lesson 4 • Compressor Diagnostics

Combines electrical and refrigerant data to evaluate compressor mechanical condition. Students distinguish external faults from internal compressor failure before replacement.

Lesson 1 • Refrigerant Leak Detection and Repair

Uses electronic leak detectors, UV dye, and nitrogen pressure testing to locate and repair leaks. Leak repair must precede recharging to prevent repeat service calls.

Lesson 2 • Fan Motor Replacement

Demonstrates condenser and evaporator fan motor removal, wiring, and blade installation. Correct motor rotation and blade pitch are verified before system restart.

Lesson 3 • Capacitor and Contactor Replacement

Covers safe discharge, sizing, and installation of run and start capacitors and contactors. These are the most frequently replaced components in residential AC service.

Lesson 4 • Compressor Replacement Procedure

Covers the full compressor changeout sequence from recovery through startup and performance check. Acid flush and filter-drier replacement protect the new compressor.

Lesson 1 • Filter and Indoor Air Quality Maintenance

Covers filter types, MERV ratings, and replacement intervals for optimal airflow and air quality. Filter selection balances air quality goals with system static pressure limits.

Lesson 2 • Seasonal Maintenance Procedures

Outlines spring startup and fall shutdown tasks for residential and light commercial AC systems. Seasonal maintenance prevents in-season failures and maintains warranty compliance.

Lesson 3 • Refrigerant System Performance Verification

Measures superheat, subcooling, and delta-T to confirm refrigerant charge and heat transfer efficiency. Performance data establishes a baseline for future maintenance comparisons.

Lesson 4 • Maintenance Reporting and Customer Communication

Teaches professional documentation of findings, recommendations, and completed work. Clear reports build customer trust and support upsell opportunities for system upgrades.