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Certified Refrigeration and Air-conditioning Technician Level-II

How It Works

  1. 1. Select Certification & Register
  2. 2. Receive a.) Online e Learning Access (LMS)    b.) Hard copy - study material
  3. 3. Take exam online anywhere, anytime
  4. 4. Get certified & Increase Employability

Test Details

  • Duration: 60 minutes
  • No. of questions: 50
  • Maximum marks: 50, Passing marks: 25 (50%).
  • There is NO negative marking in this module.
  • Online exam.

Benefits of Certification

Rs.3,499 /-

Vskills has developed a new strategic framework for Skill Development for early school leavers and existing workers, especially in the unorganized sector to improve their employability called Trade Employable Skills (TES).

Trade Employable Skills does effective assessment and certification of candidates in different trade disciplines like Electrical, Electronics, Agriculture, Chemical, Automobile, IT, etc to make them job ready.

Why should one take this certification?

To demonstrate clear understanding and practical aspects and to get a visible recognition for this knowledge.

Table of Content

Practice Test

Companies that hire Refrigeration and Air-conditioning Technician Level-II

All small and medium companies need certified employees who have the requisite skills. There are more jobs opening up in the economy on a regular basis with the fast growth of the country.

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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

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

Air – conditioning system

Electrical components of window air-conditioner

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

  • Know How To Clean The Air Filters
  • Describe Types of Air And Their Specifications
  • 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

  • Explain Room Air Flows
  • Room Units Air Flows

Velocity Meters

  • Explain Air Flow Measurements
  • Explain The Types of Anemometers
  • Velocity And CFM
  • Anemometer
  • Rotating Vane Anemometer
  • Deflecting Vane Anemometer
  • Hot wire Anemometer
  • Air Velocity at Various temperature
  • Air Velocities Corresponding to Velocity Pressure

Principles of Pipe Sizing

  • Explain Refrigerant Lines And Piping
  • Describe Piping Materials
  • Know General Design Consideration
  • Understand Suction Line Size, Discharge Line Size
  • Piping Materials
  • Pipe Joints
  • General Design Consideration
  • Sunction Line Size, Discharge Line Size For Air –Condi- Tioners Are Given In Table

Study of Service Valves

  • Describe The Service
  • Understand The Service Valve Operation
  • Use of Service Valve For Gas Charging
  • Describe The Features of Split A/C System
  • Explain About Selector Switch
  • List The Different Models of Working In Split A/C
  • The Working Principle of Split A/C

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

  • Analyse The Causes For The Complaint Compressor Does Not Start With The Help of Problem Tree
  • Analyse The Causses For The Defect Leading  to The Complaint With The help of The Trouble Shooting Chart
  • Analyse The Sequence For Repair Using The Service Flow Sequence
  • Symptom : “ Compressor Does Not Start”

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

  • Analyse The For The Complaint/Defect –Compressor Trips Frequently With The Help of Problem Tree (PT)
  • Anlyse The Causes For The Defect Leading To The Complaint With help of Trouble Shooting Chart (TSC)
  • Analyse The Sequence For Repair Using The Flow Sequence

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

  • Analyse The Causes (s) For The Cmplaint “Poor Cooling”- With The help of Problem Tree (PT)
  • Anlyse The Cause (s) For  The  Defect Leading To The Complaint With The Help of Trouble Shooting Chart (TSC)
  • Analyse The Sequence For Repair Using The Service Flow Seqence (SfS)

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

  • Analyse The Cause (s) For Complaint “Poor Cooling” –Unit Running Continuously With The Help Of “Problem Tree”(PT)
  • Analyse The Sequence For Repairs Using The Servicing Flow Sequence (SFS)
  • Symptom; “Poor Cooling

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

  • Anlyse The Causes For The Defects “Water Leakage In Indoor Unit” With The Help of Problem Tree (PT)
  • Analyse The Causes For The Defect Leading To The Complaint With Help of Troubleshoot Chart (TSC)
  • Analyse The Sequence For Repairs Using The Service Flow Sequence (SFS)

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