Technician • Field‑ready • Refrigeration

Professional AC Mechanic Course (LMS)

A practical, safety-first course covering refrigeration theory, refrigerants, installation, controls, fault diagnosis and energy-efficient HVAC practices—content prepared by trainers with 10+ years of industry experience.

45+ Lessons 10 Labs Certification
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Key Skills
  • Safe refrigerant handling & leak detection.
  • Compressor, expansion device & heat-exchanger troubleshooting.
  • Controller setup, sensors calibration, and commissioning.
Regulatory & Safety

Compliant refrigerant handling, PPE, and environmental responsibility.

Tools & Testers

Manifold sets, vacuum pumps, leak detectors, gauges, and charging scales.

Field Diagnostics

Systematic fault-finding with thermography and performance benchmarking.

1) Orientation & Outcomes

Define competencies, career paths, and expected deliverables for field technicians and service engineers.

This module sets expectations—safety culture, customer communication, documentation, and the assessment rubric for practical and theory evaluations.

2) Refrigeration Fundamentals

Understand thermodynamic cycles and heat transfer applied to refrigeration systems.

  • Vapor-compression cycle: compressor, condenser, expansion device, evaporator.
  • Properties of refrigerants: pressure-temperature relationships, phase diagrams.
  • Superheat & subcooling: measurement and significance for system health.

3) Tools & Safety

Safe tool usage, PPE, and environmental compliance when dealing with refrigerants and high-voltage components.

  • Manifold gauge sets, vacuum pumps, leak detectors, electronic scales, and thermography cameras.
  • PPE for oxygen-deficient spaces, safe cylinder handling, and MSDS understanding.
Lab Task

Demonstrate safe recovery of refrigerant into a cylinder using an approved recovery unit.

4) Components & Systems

Identify and test key components: compressors, TXVs, capillary tubes, condensers and evaporators.

  • Compressor types & failure modes.
  • Heat exchangers: fin & tube, plate, evaporator coil servicing.
  • Expansion devices: thermostatic expansion valve (TXV) vs fixed orifice.

5) Refrigerants & Handling

Regulations, environmental impact (GWP/ODP), safe storage, and charging procedures.

  • Modern refrigerants (R32, R410A alternatives) and retrofit considerations.
  • Leak detection techniques and acceptable leak rates for different systems.
  • Charging by superheat/subcooling vs weight—practical examples.

6) Installation & Piping

Best practices for pipe routing, insulation, brazing, vacuuming, and commissioning procedures.

  • Liquid & suction line sizing, oil traps, and service valve positioning.
  • Brazing techniques, nitrogen purge, and pressure/vacuum test protocols.
  • Insulation types and preventing condensate/thermal bridging.

7) Controls & Electricals

Wiring, starters, contactors, overloads, sensors, and controller configuration.

  • Basic motor starters (DOL, star-delta), overload settings, and motor protection.
  • Thermostats, pressure switches, defrost controls, and BMS integration basics.
  • Safe isolation procedures and electrical test points for commissioning.

8) Troubleshooting & Repair

Structured fault-finding workflows, common failure modes, and repair strategies.

  • Symptoms: low cooling, high discharge temps, short-cycling—diagnostic flowcharts.
  • Using gauges, thermistors, clamp meters, and oil analysis to pinpoint issues.
  • Common fixes: valve replacement, compressor burnout protocols, leak repair & re-test.

9) Efficiency & Commissioning

Performance benchmarking, energy-saving measures, commissioning checklists and handover documentation.

  • Key performance indicators: EER, SEER, sensible heat ratio, and methods to measure them.
  • Commissioning report: baseline readings, adjustments, and customer briefing.
  • Retrofit strategies for efficiency improvements and refrigerant upgrades.

10) Projects, Assessment & Certification

Capstone projects, practical exams, and a verifiable field competency certificate.

  • Practical assessments: install & commission a split AC or small RTU with full documentation.
  • Theory quizzes and scenario-based viva.
  • Portfolio: lab reports, commissioning sheets, and before/after performance metrics.

Labs & Practical Tasks

Hands-on exercises to validate safe, standard-compliant work.

Vacuum & Leak Test

Evacuate a system to required microns and perform an extended leak test.

Charge by Weight

Demonstrate correct refrigerant charging using scale and target superheat.

Sensor Calibration

Calibrate thermostats and temperature sensors; verify control response.

Assessments & Certification

Auto-graded theory checks plus instructor-reviewed practicals and commissioning evidence.

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Ready to become a certified AC technician?

Enroll for structured labs, downloadable checklists, and a verified certificate on completion.

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