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Certified Refrigerater and Deep Freezer Mechanic

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 Refrigerater and Deep Freezer Mechanic

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.

Apply for Certification

By Net banking / Credit Card/Debit Card

We accept Visa/Master/Amex cards and all Indian Banks Debit Cards. There is no need to fill application form in case you are paying online.

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  • Master Card
  • American Express


Common Basic refrigeration tools, copper tube cutting and bending method

  • Flaring tool with yoke
  • Tube cutter
  • Pipe bending tool
  • Swaging tools
  • Pinching tools
  • Compound gauge
  • Leak detects
  • Types of tubing
  • Tube cutting
  • Bending tubing
  • General and safety precautions
  • Prohibition signs
  • Mandatory signs
  • Warning signs questions about your safety

Swaging, flaring, pinching and brazing technique

  • Swaging on copper tubing
  • How to use a brazing torch
  • Kerosene blow lamp
  • Silver brazing
  • Flux
  • Braze copper with MS tube
  • Flaring necessity
  • Types of flaring
  • Flared tubing fittings
  • Pressurising the joint on tubing
  • Pinching description
  • Brazing
  • Test of leaks
  • Refrigeration cycle
  • Classification of refrigeration system
  • Refrigeration and reverse refrigeration system
  • Heat energy

Conventional and frost free refrigerators

  • Refrigeration
  • Conventional refrigeration
  • Compressor
  • Parts of a conventional refrigerator
  • Controls of a conventional refrigerators and frost free refrigerators
  • Difference between the conventional type and  frost free refrigerator
  • Refrigerants
  • Identifing refrigerants by number
  • Other numbering codes
  • Classification according to toxicity & flammability
  • Other classification
  • Environmental impact of cfc & other refrigerants
  • Ozone depleting potential
  • Cylinder volume
  • Global warming potential
  • Phase out of CFCs
  • Refrigerants cylinders and valves

Details of electrical components in refrigerators  

  • Relay
  • Over load protector
  • Compressor winding
  • Types of electrical supply (voltage)
  • Type of current
  • AC supply
  • Alternating voltage
  • Identification of instruments from the data given on the dial

Electrical parts in frost free refrigerator

  • The electrical parts in ‘frost free refrigerator’
  • Function of compressor
  • Relay and overload protector
  • Cooling coil fan motor
  • Timer switch
  • Fan motor connection will cut off by timer switch
  • Testing method of thermostat
  • Electrical circuit of CSIR

Wiring circuit of deep freezer

  • Types of deep freezers
  • Function of electrical components
  • Describe overload protector and its function
  • Describe the function of defrost timer
  • Different types of wiring diagrams
  • Safety precautions (when handling electrical circuits in a deep freezer)

Detail of Refrigerator

  • Refrigerator
  • Refrigerator capacity
  • Conventional refrigerator
  • Frost free refrigerator
  • Refrigerator door
  • Capacity selection of refrigerator for different application
  • Defrost temperature controls of frost free refrigerators
  • Defrost controls
  • Damper control adjustment

Periodic service of deep freezer

  • Importance of servicing deep freezer
  • Servicing of electrical components

Leak arresting and testing methods

  • For leak spot there are two kind of welding (brazing)
  • Leak testing methods
  • Leak testing instruments
  • Test pressure

Evacuation method in refrigeration

  • Need of vacuum
  • Vacuumising methods
  • Vacuum level
  • Vacuum pumps
  • Accessories

Refrigerant charging methods

  • Refrigerant charging
  • Methods of refrigerant charging
  • Charging accessories
  • Charging cylinder
  • Charging board
  • Refrigerant containers/cylinders
  • Automatic refrigerant charging meter
  • Important instruction before charging
  • System performance
  • Setting high and low pressures

Recovery of gas and service of HFC 134a – Refrigerator

  • Recovery of refrigerants
  • Methods of recovery
  • Active methods of recovery
  • Special recovery cylinders
  • Recovery & Recycling machine
  • How to service direct cooled HFC 134a refrigerator
  • Evaporator and condenser in HFC 134a refrigerator
  • Replacement of thermostat

Hydrocarbon refrigerants – retrofitting deep freezer

  • Properties of HC refrigererants
  • Handling HC cylinders
  • Hydrocarbons as refrigerants
  • HC blend refrigerantscan substitute CFC 12
  • Handling of zeotropic blends and their characteristic

Defects in frost free refrigerator – “Poor Cooling”

  • Symptom “Poor cooling”

‘No cooling’ of deep freezer

  • Cause analysis
  • Analysis cause behind the defects
  • Ways to rectify ‘No cooling’
  • Steps to be taken prevent ‘No cooling’

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