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’

Apply for Certification

https://www.vskills.in/certification/Vskills-Certified-Refrigerater-and-Deep-Freezer-Mechanic