The goal of the course is to give participants a good understanding of the processes of Refrigeration and Air-conditioning in other to enhance their performance in servicing and maintenance of Refrigeration and Air-conditioning equipment. Participants will carry out practical activities on vacuuming, system charging, brazing, pump down, electrical connections etc.

 At the end of the course, participants will be able to:

  1. Understand the operational concept of Refrigeration and Air-conditioning
  2. Acquire troubleshooting skills of Refrigeration and Air-conditioning and utility systems
  3. Identify, Use and Maintain Refrigeration and Air-conditioning tools
  4. Carry out repairs and maintenance of Refrigeration & Air-conditioning systems
  5. Observe safe practices in dealing with components relating to Refrigeration & Air-conditioning and utility system.

Module 1: Introduction to Heating Ventilation and Air-Condition (HVAC) system

  • Refrigeration and Air-condition Overview
  •    Refrigeration system
  • Vapour compression (Introduction)
  • Vapour absorption
  • Differences between vapour compression and vapour absorption system
  • Method of Heat Transfer
  • Science of Refrigeration
  • State of mater and refrigerant
  • Temperature, pressure, heat and boiling Point

Module 2: Refrigerant

  • Refrigerant overview
  • Refrigerant type
  • Molecular composition of refrigerants: CFC, HFC and HCFC
  • Refrigerant application and replacement

Module 3: Vapour Compression System

  • Basic refrigeration cycle
  • Condition of refrigerant inside each component of a refrigeration system
  • Saturation card, system pressure and temperature

Module 4: Refrigeration Components

  • Compressors
  • Hermetic, semi-hermetic and open type
  • Rotary, reciprocating and centrifugal compressor
  • Service valves: SSV, DSV, LLSV and Schraeder
  • Maintenance
  • Metering Devices
  • Expansion valve: Thermostatic, automatic and electronic
  • Capillary, float and restricted orifices
  • Maintenance
  • Evaporators
    • Type: Dry expansion and flooded
    • Forced convection, bare tube, plate and finned
    • Maintenance
  • Condenser
    • Type: Shell and tube, Tube in tube and Shell and coil
    • Cooling tower and evaporative condenser
    • Maintenance
    • Other Components and ancillaries
    • Filter, dryer and sight glass
    • Suction accumulator, oil separator etc
    • Maintenance

Module 5: Refrigeration Tools, Instruments, Gauges operation and maintenance

  • Tools, Instruments and gauges and materials and Supply          
  • Tubing, fittings and pipe sizing    
  • Copper tube bending, flared connection and soldering and Brazing     
  • Safety in refrigeration systems   
  • Operation and Maintenance       
    • Service valves            
    • Pump down and adding oil    
    • Refrigerant recovery 
    • Purging, pressurizing with Inert gas and leak detection       
    • Vacuuming and refrigerant changing               
    • Causes of high head pressure      

Module 6: Electrical Measuring Instruments     

  • Voltmeter, ohmmeter and ammeter      
  • Electric motors      
  • Electrical controls           
  • Temperature (Thermostat, thermistors etc) and pressure control
  • Switches, push-button and sensors
  • Relay, overload and capacitor
  • Operating and safety control
  • Other electrical components
  • Electrical circuits and connection

The training sessions will, as much as possible be practical and interactive, involving structured learning methods and hands-on practice.

  • D.McKINSEY AND ASSOCIATES Ltd Certificate of Completion for individuals who attend and complete the Refrigeration & Airconditioning: Installation, Troubleshooting & Maintenance.
  • Candidates who desire International Certifications shall be registered through our platform for such an examination.


D.Mckinsey is licensed to train and issue certificates by the following bodies;

–           Nigerian Council for Management Education, (CMD).

–           OGTAN (Oil and Gas Trainers Association of NIGERIA).

Kindly confirm space availability by calling +234 (0) 8023192104 or +234 (0) 9062386530 or send an email to,   For In-House training programs / on request, please contact us using above contact details.

MAR 4-8

NOV 11-15

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