REPAIR AND MAINTENANCE OF CENTRAL AIR CONDITIONING PLANT
Name of Sector Refrigeration & Air Conditioning Name of Module Repair And Maintenance Of Central Air Conditioning Plant
Minimum Age 18 Years Duration of Course 6 Months
ADU Code REF 701

Degree in Mechanical Engineering with one year Experience

(OR)

Diploma in Mechanical Engineering with two year Experience

(OR)

NTC/ NAC in RAC Trade with three years of Experience



1. Familiarization of Air conditioning tools, Instruments & Equipments.

2. Tube cutting, bending, flaring, swaging, brazing, welding.

3. Measuring Current, voltage, resistance, temperature and pressure.

4. Check open circuit, short circuit and earth of three phase motors.

5. Identify three phase motors and open type compressors.

6. Check relay, OLP, thermostat, motors, low pressure and high pressure cut out, Capacitors.

7. Check the wiring circuit of Central Air Conditioner.

8. Check the efficiency of Open type compressor.

9.Dismantle and Assemble Open type Compressor.

10. Identify the trouble and rectification.

11. Descaling water Cooled condenser.

12. Flushing Condenser and Evaporator.

13. Leak Testing, Evacuation, Gas Charging In Central A.C.

14. Servicing Central Air Conditioner.

15. Check the performance of Air conditioner.

16. Operation of Central Air Conditioner



Underpinning Knowledge (Theory) Practical Competencies
    Safety Practices
  • Safety Precautions, study the function and working of Air Conditioning tools, Instruments & Equipments.
  • Study the construction and working of V.C. Cycle of Central A.C.
  • Mechanical and electrical components used in central A.C and its description.
  • Ducts, filters, AHU and its details.
  • Study the current, voltage, resistance measuring.
  • Study the open circuit, short circuit and earth testing.
  • Study the different types of motors used in Central A.C.
  • Study the different types of starters, OLP, thermostat, fan, Capacitors, oscillating motors in Central A.C.
  • Study the trouble shooting in Central Air Conditioners.
  • Refrigerant, gas charging, evacuation and leak test.
  • Operation of Central Air Conditioning Plant.


  • Familiarization of Air conditioning tools, Instruments & Equipments.
  • Tube cutting, bending, flaring, swaging, brazing, welding.
  • Measuring Current, voltage, resistance, temperature and pressure.
  • Check open circuit, short circuit and earth of three phase motors.
  • Identify three phase motors and open type compressors
  • Check relay, OLP, thermostat, motors, low pressure and high pressure cut out, Capacitors
  • Check the wiring circuit of Central Air Conditioner
  • Check the efficiency of Open type compressor.
  • Dismantle and Assemble Open type Compressor.
  • Identify the trouble and rectification
  • Decaling water Cooled condenser.
  • Flushing Condenser and Evaporator.
  • Leak Testing, Evacuation, Gas Charging In Central A.C
  • Servicing Central Air Conditioner
  • Check the performance of Air conditioner.
  • Operation of Central Air Conditioner