Vskills Certified RAC Technician Level-II Table of Content

Table of Content

Study of frost free refrigerator

  • Define conventional refrigerator
  • Define frost free refrigerator
  • Features of the household refrigerator

Refrigerator system of frost free refrigerator

  • Construction of the free refrigerator
  • Compressor
  • Parts of a conventional refrigerator
  • Evaparator

Electrical components and their function in a frost free refrigerator

  • Deforst Timer
  • Defrost Heater

Study of wiring, Automatic defrost, heater, Timer fan motor and air duct system

  • Electrical de-frost system
  • Defrost Controls
  • Damper control adjustment

Methodology of Retrofitting

  • Retrofitting of CFC filled refrigerator with the HFC 134a refrigerator
  • HFC’s advantage
  • HFC’s disadvantage
  • Precaution to be taken when retrofitting CFC filled refrigerator with HFC-134a
  • Comparative study of components used for R-12 and R134a.

Details of CFC filled refrigerator with Hydro Carbon blend

  • Retrofit CFC filled refrigerator with the HC refrigerant
  • Refrigerator electrical devices using HC Refrigerants
  • Properties of HC refrigerant
  • Precaution to be taken when retrofit CFC filled refrigerator with HC blend refrigerants
  • Care of handling with hydro carbon cylinders

Refrigerators using different refrigerants

  • The service, components and replacement in HC refrigerator
  • Comparative study on performance of refrigerator

Introduction of Air-conditioning

  • Past Air-conditioning equipments
  • Present Air-conditioning equipments
  • Future Air-conditioning equipments

Air-conditioning Fundamentals

  • Air conditioner

Constructional details of window Air-conditioner

  • Main components of window A/C
  • Front grill
  • Outer cover

Air -conditioning system

  • Air movement in air conditioned area

Electrical components of window air-conditioner

  • Selector switch
  • Thermostat
  • Relay
  • O.L. P.
  • Capacitors

Split Air-conditioning

  • Types of split air-conditioner
  • Condenser
  • Expansion devices
  • Liquid line drier filter
  • Evaporator
  • Liquid suction heat exchanger
  • Suction line accumulator
  • Fan, Fan motor, blower
  • Refrigerant tubing
  • Ventilation of room
  • Drainage of condensate water
  • Functions

Comparison, advantage and disadvantage of split a/c and windows a/c

  • Importance points of spilt a/c
  • Specification of spilt a/c
  • Windows ac unit consist of following components
  • Windows ac system

Air cooled condensers

  • Use of condenser
  • Fin type air cooled condenser

Constructional details and specification of air condenser

  • Detail of air cooled condenser
  • Selection of air condenser
  • Fin is part of tubing
  • Coiled wire uses as fin
  • Circular fin
  • Large multiple fin

Air Filters Their Types and Specification

  • How to clean The Air Filters
  • Types of Air Filters And Their Specifications
  • Prefilters Fine Filters
  • Filters And Maintenance of Filters
  • Electronic Air Cleaners

Air Flow Measurements

  • Room Air Flows
  • Room Units Air Flows

Velocity Meters

  • Explain Air Flow Measurements
  • Velocity And CFM
  • Anemometer
  • Rotating Vane Anemometer
  • Deflecting Vane Anemometer
  • Hot wire Anemometer
  • Air Velocity at Various temperature

Principles of Pipe Sizing

  • Piping Materials
  • Pipe Joints
  • General Design Consideration
  • Sunction Line Size, Discharge Line Size For Air –Conditioners

Study of Service Valves

  • Understand The Service Valve Operation
  • Use of Service Valve For Gas Charging

Defective Window Model Room Air –Conditioner – “Compressor Does not Start’’

Defects in Window Model Air – Conditioner – “Compressor Trips Frequently"

Defects In Window Air –Conditioner - “poor Cooling” – “Evaporator Coil

Defects in Window Air –Conditioner “Poor Cooling”- Unit Running Continuosly

Defects in Split Type –Conditioner “Water Leakge In Indoor Unit”


  • Windows Basics
  • The User Interface
  • Windows Accessories
  • Windows 7
  • Windows 10

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