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

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)

Apply for Certification

https://www.vskills.in/certification/Vskills-Certified-Refrigeration-and-Air-conditioning-Technician-Level-II