Duration: 1 Year
Eligibility Criteria: Madhyamik

Refrigeration and Air Conditioning is a one year duration course that a student opts after the completion of matriculation examination (Class 10th). … It is a specialized course that covers topics related to air conditioning and refrigeration process and working of different parts of cooling devices.

The refrigeration and air conditioning repair & maintenance course aims at rewarding careers in the respective Refrigeration & AC Industry in different job activities such as manufacturing, servicing both maintenance and repairing. The following course curriculum is designed to acquaint a learner with the various aspects of repairing and servicing of cooling items.

Job Opportunity

  • Mechanical Company
  • Construction Industry
  • Appliance Industry
  • Education

Job Role

  • AC Service Technician
  • Assembly and testing of refrigerators and air-conditioners in manufacturing companies
  • Installation & maintenance of centralized AC plants, cold storage etc.
  • Repairing and preventive maintenance of refrigerators, air- conditioners, water coolers etc.
  • Sales of refrigerators, air-conditioners, water coolers
  • Electrical maintenance in manufacturing companies

TRADE THEORY
1 st sem & 2 nd sem (1Year)

  • Module 1: Fitting & Sheet metal
  • Module 2: Electrical & Electronics
  • Module 3: Welding
  • Module 4: Introduction to Refrigeration
  • Module 5: Refrigeration Systems
  • Module 6: Compressors
  • Module 7: Condenser
  • Module 8: Liquid Receiver and Dehydrator
  • Module 9: Refrigerant Control Devices
  • Module 10: Evaporators
  • Module 11: Refrigerationts
  • Module 12: Motor Controls
  • Module 13: Basic Electricity
  • Module 14: Safety Precautions and service Tools
  • Module 15: Refrigeration Raw Materials
  • Module 16: Servicing of Machines
  • Module 17: Refrigeration and Air Conditioning Machines and Heat Load
  • Module 18: Science related to Refrigeration
  • Module 19: Refrigeration and air Conditioning terms

EMPLOYABILITY SKILLS

Part- A

Basic Training

Workshop Calculation

Unit, Fractions

  • Unit – Classification of unit system
  • Unit – Fundamental and Derived units F.P.S, C.G.S, M.K.S and SI units
  • Unit – Measurement units and conversion
  • Factors, HCF, LCM and problems
  • Fractions – Addition, substraction, multiplication & division
  • Decimal fractions – Addition, subtraction, multilipication & division
  • Solving Problems by using calculator

Square Root: Ratio and Proportions, Percentage

  • Square root – Square and suare root
  • Square root – Simple problems using calculator
  • Square root – Applications of pythagoras theorem and related problems
  • Ratio and proportion
  • Ratio and proportion – Direct and indirect proportions
  • Percentage
  • Precentage – Changing percentage to decimal and fraction

Material Science

  • Material science – Types metals, types of ferrous and non ferrous metals
  • Material science – Physical and mechanical properties of metals
  • Material science – Introduction of iron and cast iron
  • Material science – Difference between iron & steel, alloy steel and carbon steel
  • Material science – Properties and uses of rubber, timber and insulating materials

Mass, Weight, Volume, and Density

  • Mass, volume, density, weight and specific gravity
  • Related problems for mass, volume, density, weight & specific gravity

Speed and Velocity, Work Power and Energy

  • Speed and velocity – Rest, motion, speed, velocity, difference between speed and velocity, acceleration and retardation
  • Speed and velocity – Related problems on speed & velocity
  • Work, power, energy, HP, IHP, BHP and efficiency
  • Potential energy, kinetic energy and related problems with assignment

Heat & Temperature and Pressure

  • Heat & Temperature – Concept of heat and temperature, effects of heat, difference between heat and temperature, boiling point & melting point of different metals and
    non-metals
  • Heat & Temperature – Scales of temperature, celsius, fahrenheit, kelvin and conversion between scales of temperature
  • Heat &Temperature – Temperature measuring instruments, types of thermometer, pyrometer and transmission of heat – Conduction, convection and radiation
  • Heat & Temperature – Co-efficient of linear expansion and related problems with assignments
  • Heat & Temperature – Problem of heat loss and heat gain with assignments
  • Heat & Temperature – Thermal conductivity and insulators
  • Concept of pressure – Units of pressure, atmospheric pressure, absolute pressure, gauge pressure and gauges used for measuring pressure

Basic Electricity

  • Basic electricity – Introduction and uses of electricity, molecule, atom, how electricity is produced, electric current AC,DC their comparison, voltage, resistance and their units
  • Basic electricity – Conductor, insulator, types of connections – series and parallel
  • 5 Basic electricity – Ohm’s law, relation between V.I.R & related problems
  • Basic electricity – Electrical power, energy and their units, calculation with assignments
  • Basic electricity – Magnetic induction, self and mutual inductance and EMF generation
  • Basic electricity – Electrical power, HP, energy and units of electrical energy

Mensuration

  • Mensuration – Area and perimeter of square, rectangle and parallelogram
  • Mensuration – Area and perimeter of Triangles
  • Mensuration – Area and perimeter of circle, semi-circle, circular ring, sector of circle, hexagon and ellipse
  • Mensuration – Surface area and volume of solids – cube, cuboid, cylinder, sphere and hollow cylinder
  • Mensuration – Finding the lateral surface area, total surface area and capacity in litres of hexagonal, conical and cylindrical shaped vessels

Levers and Simple Machines

  • Simple machines – Effort and load, mechanical advantage, velocity ratio, efficiency of machine, relationship between efficiency, velocity ratio and mechanical advantage
  • Lever & Simple machines – Lever and its types

Trigonometry

  • Trigonometry – Measurement of angles
  • Trigonometry – Trigonometrical ratios
  • Trigonometry – Trigonometrical tables
  • Trigonometry – Application in calculating height and distance (Simple applications)

ENGINEERING DRAWING

Engineering Drawing  Introduction

Introduction to Engineering Drawing and Drawing Instruments –

  1. Conventions
  2. Viewing of engineering drawing sheets.
  3. Method of Folding of printed Drawing sheet as per BIS SP: 46-2003

Drawing Instrument

  1.  Drawing board, T-square, Drafter (Drafting M/c), Set squares, Protector, Drawing Instrument Box (Compass, Dividers, Scale, Diagonal Scales etc.), pencils of different grades, Drawing pins/ Clips.)

Free hand drawing of –

  1. Lines, polygons, ellipse etc.
  2. Geometrical figures and blocks with dimension
  3. Transferring measurement from the given object to the free hand sketches.
  4. Solid objects – Cube, Cuboids, Cone, Prism, Pyramid, Frustum of Cone with dimensions.
  5. Free hand drawing of hand tools and measuring tools, simple fasteners (nuts, bolts, rivets etc.) trade related sketches

Lines

  1. Definition, types and applications in drawing as per BIS: 46-2003
  2. Classification of lines (Hidden, centre, construction, extension, Dimension, Section)
  3. Drawing lines of given length (Straight, curved)
  4. Drawing of parallel lines, perpendicular line
  5. Methods of Division of line segment

Drawing of Geometrical figures

Definition, nomenclature and practice of –

  1. Angle: Measurement and its types, method of bisecting.
  2. Triangle: different types
  3. Rectangle, Square, Rhombus, Parallelogram.
  4. Circle and its elements
  5. Different polygon and their values of included angles. Inscribed and circumscribed polygons

Lettering & Numbering

  1. Single Stroke, Double Stroke, Inclined

Dimensioning and its Practice

  1. Definition, types and methods of dimensioning (functional, non-functional and auxiliary)
  2. Position of dimensioning (Unidirectional, Aligned)
  3. Types of arrowhead tolerance
  4. Leader line with text
  5. Symbols preceding the value of dimension and dimensional tolerance.

Sizes and layout of drawing sheets

  1. Selection of sizes
  2. Title Block, its position and content
  3. Item Reference on Drawing Sheet (Item list)

Method of presentation of Engineering Drawing

  1. Pictorial View
  2. Orthographic View
  3. Isometric View

Symbolic representation – different symbols used in the trades

  1. Fastener (Rivets, Bolts and Nuts)
  2. Bars and profile sections
  3. Weld, Brazed and soldered joints
  4. Electrical and electronics element
  5. Piping joints and fitting

Projections

  1. Concept of axes plane and quadrant
  2. Orthographic projections
  3. Method of first angle and third angle projections (definition and difference)
  4. Symbol of 1st angle and 3rd angle projection.

Orthographic projection from isometric projection

Reading of fabrication drawing

TRADE PRACTICAL

1 st sem &a 2 nd sem (1Year)

  • Identify workshop & Machineries.
  •  Demonstrate safety precautions and first aid.
  •  Demonstrate fire fighting
  •  Identify general tools, instruments & equipments. Care and maintenance of tool, instruments and equipments.
  •  Demonstrate Electrical safety precautions and First aid.
  •  Identify, use and maintain electrical tools.
  •  Prepare simple twist joints of wires.
  •  Prepare married joints of wires.
  •  Measure current, voltage, resistance, power, frequency, energy using analog and Digital meter through a single phase circuit.
  • Star & Delta connection on a three phase motor and show line voltage, line current, phase voltage and phase current.
  •  Three phase power & power factor measurement.
  •  Identify transistors, resistors, capacitors, diodes, S.C.R., U.J.T., amplifier and I.C.
  •  Construct and test full wave rectifier using diodes.
  •  Construct and test a bridge rectifier.
  •  Identify and test SCR.
  •  Identify gas welding equipments & accessories.
  •  Demonstrate safety precaution in handling of Oxy-acetylene cylinders, regulators etc.
  •  Identify & use of general hand tools, instruments & equipments used in refrigeration work.
  •  Identify & use of special tools, instruments & equipments used in refrigeration work.
  •  Identify various refrigeration equipments and components of vapour compression system like compressor, condenser, expansion device and evaporator. Identify and Check vapour absorption refrigeration cycle (VARC)
  •  Unroll, cut and bend soft copper tubes.
  •  Swage and make a brazed joint on copper tubing.
  •  Make flare joints and test them with flare fittings.
  •  Pinch off copper tubing.
  •  Use lock ringtool and various fittings of lockring for servicing of appliances.
  •  Identify electrical and mechanical components of refrigerator.
  •  Identify electrical and mechanical components of refrigerator.
  •  Check and replace electrical components of refrigerators.
  •  Leak test, evacuation, gas charging in refrigerators.
  •  Wiring circuit of refrigerator.
  •  Installation of refrigerator.
  •  Identify electrical components of direct cool refrigerator.
  •  Installation of refrigerator.
  •  Tracing the mechanical components of refrigerator.
  •  Check, Find Fault and test the electrical and other system components of refrigerator.
  •  Testing of compressor.
  •  Identification of motor terminals.
  •  Start of compressor with and without relay.
  •  Test performance of direct start refrigerator.
  • Cleaning and flushing of evaporator and condenser with dry nitrogen.
  •  Replacement of capillary tube and drier.
  •  Installation of gauge manifold in the system.
  •  Leak testing, evacuation and gas charging in refrigerator.
  •  Check electrical wiring of refrigerator.
  •  Tracing electrical circuit of Frost Free refrigerator.
  •  Checking, fault finding and testing of electrical accessories like thermostat, timer, defrost heaters, bi-metal, air louvers etc. and other system components.
  •  Checking air distribution system.
  •  Servicing of refrigerator.
  •  Testing the performance of refrigerator.
  •  Identify three and four door no frost refrigerator.
  •  Stripping of components.
  •  Tracing electric circuit.
  •  Testing components.
  • Leak testing, evacuation, gas charging.
  •  Acquainting with hermetic compressor of Refrigerator or window type AC.
  •  Cut the compressor and dismantle. (05 hrs) 86. Identify different compressor and Service it.
  •  Lap necessary parts and cut the gasket.
  •  Assemble the compressor with the new gasket.
  •  Dismantle rotary / wobble plate/ swash plate/scroll compressor.
  •  Identify different parts of dismantled compressor.
  •  Rectify defects and repair accordingly.
    Identify terminal sequence of hermetic compressor motor by using digital multimeter and start by DOL starter and measure starting current and running current by using ammeter and AVO meter.
  •  Identification of terminal sequence of CSIR motor by using digital multimeter and start by DOL starter and measure starting current and running current by using Ammeter and AVO meter. Direct start using ammeter and voltmeter.
  •  Select a hermetic compressor of any kind.
  •  Start the compressor motor by RSIR, CSIR, PSC & CSR method by using different type relay, capacitors, OLP’s, etc.
  •  Check and Test different type relay, Capacitors, OLP’s, find out fault, rectify and install.
  •  Identify the terminals of a Squirrel cage induction motor.
  • Start the motor through DOL starter and measure starting current, running current and show changing of DOR.
  •  Start the motor through Star Delta or Auto transformer starter and measure starting current, running current and show changing of DOR.
  •  Rectify fault through insulation test, continuity test, open circuit test and short circuit test.
  •  Explain control circuit of variable speed air conditioners (Inverter ACs).
  •  .Identify components of control system of Inverter ACs including printed circuit board (PCB) NTC,PTC e.g. Power PCB, Filter PCB, Heat sink reactor.
  •  Wiring of the control system.
  •  . Familiarise with different types of condensers used in refrigerators, Bottle coolers, visible coolers, deep freezers, Window and Split AC.
  • . Clean, flush, service and leak test different type of aircooled condensers, micro channel condensers. Remove dust from fins in air cooled condenser, micro channel condensers.
  • . Identify with different types of water cooled condensers like Shell and Tube type, Tube within tube type, shell, coil & evaporative type, etc.
  •  . Identify different items necessary for de-scaling like diluted Hcl, Pump & motor, hose, etc.
  •  Identify drier and capillary tube used in different cooling machines.
  • . Replace drier and capillary tube at the time of gas charging according to manufacturer’s direction.
  •  .Install different diameter capillary tube used in different type of cooling machines.
  •  Install with different types of expansion valves used in small cooling machines and central plant like Automatic expansion valve, Thermostatic expansion valve, hand expansion valve, and electronic expansion valves.etc.
  • Identify and service different types of evaporators like plate and tube type, Fin and tube type, etc. fitted in refrigerators, Bottle coolers, water cooler, Window and split AC.
  •  Perform leak test, flush to remove oil by dry nitrogen.
  •  Demonstrate different type of defrosting in different machines.
  •  Identify and explain different colour code of different type refrigerant cylinder like HCFCs (HCFC-22, HCFC-123). HFCs (HFC-134a, HFC-32, R-410A, R407C and R-404A) and lowGlobal Warming Potential (GWP) refrigerants like ammonia, R-290, HFC-32, blends of HFCs (R-410A, R404A, R-407C etc.) and hydro fluoroolefins (HFOs: HFO1234yf, HFO- 1234ze, HFO1233zd, HFO-1336mz), blends of HFCs and HFOs.
  • Identify insulating foam (polyurethane rigid foam and polystyrene).
  •  Fill with insulation material like PUF and glass wool.
  • Acquainting with electrical and mechanical components used in window air-conditioner.
  •  Acquainting with electrical components like selector switch, thermostat switch, relay, starting capacitor, running capacitor, overload protector, remote and PCB control, etc.
  •  .Demonstrate working of mechanical components like compressor condenser, expansion valve (capillary) and evaporator.
  •  Trouble shooting, installation, tracing wiring circuit.
  •  Leak testing, evacuation and gas charging.
  •  Hands on practice on installation of window AC following step by step procedure.
  • Install gauge manifold in the system.
  •  Show discharge pressure and sanction pressure during running time.
  • . Check performance of different parameters i.e. pressure, temperature, pull down time, air flow and current drawn.
  •  . Identify various components of split AC like mounted, floor and ceiling mounted, duct able and multi split AC.
  • . Identify electrical circuits.
  •  Test different components and fault finding.
  •  . Leak testing of the system, evacuation and gas charging.
  •  Hands on practice on Installation and trouble shooting.
  •  Same as week no. 43 in the case of wall mounted split AC.
  •  Identify various mechanical components used in car AC.
  •  Identify various electrical components used in electrical circuits in car AC. (
  •  Testing of system components & fault finding.
  • . Install gauge manifold to check suction and discharge pressure in charging time and running time.

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