S/NO.

TOPIC

CONTENT

PRACTICAL

1

Safety and first aid in the

1.1.

Workshop rules and regulations

workshop.

1.2.

Safety devices/equipment – helmet,

1.2.1

Identification and

goggles, safety boots, hand gloves,

operation of various types

overall, apron sand bag, fire

of fire extinguishers

extinguishers, etc.

1.3.

Accident: causes and prevention

techniques.

1.4.

First Aid – materials for First Aid,

charts, posters and first aid box, etc.

1.5.

Application of first aid materials.

2

Energy, matter and power.

2.1.

Definition of energy

(a)  Energy

2.2.

The process of energy

2.2.1. Demonstration of

conversion electrical to

conversion of

mechanical, gas to vapour,

mechanical to heat

mechanical to heat.

energy e.g. rubbing of

2.3.

Meaning of internal energy.

palms.

2.4.

Enthalpy of a fluid substance,

its pressure, volume and

temperature

of internal energy.

(b)

Nature of matter.

2.5.

The ph diagram of refrigerant.

2.6.

State of matter – solid, liquid,

2.6.1.  Demonstrate the

gas or vapour.

conversion of ice

block to water.

2.7.

Change of state of matter.

(c)

power.

2.8.

The meaning of power.

2.9.

Calculation of power used by a

compressor.

2.10.

Unit of power: watts and

kilowatts unit of heat: joules

and kilojoules.

its measurement

3.1.

Concept of temperature.

3.2.

Different types of thermometer

e.g. gas, resistance, liquid and

thermocouple.

3.3.

Temperature scale conversion

-

centigrade to Fahrenheit

-

Celsius to Kelvin

-

Fahrenheit to rankine

3.4.

International practical

temperature

-  The boiling point of oxygen

182.97^ºC

-  The triple point of water

0.01 ^ºC

-  The boiling point of water

(b) Pressure and its

100 ^ºC

measurement

3.5.

Concept of pressure

3.6.

Different types of pressure

3.6.1. Demonstration of the

measuring devices e.g.

use of a barometer.

barometer, manometer,

bourdon tube gauge.

3.7.

Pressure measurement

3.8.

Uses of suction and high

3.8.1.  Demonstrate how

pressure gauges.

suction and high

pressure gauges are

3.9.

Effects of temperature, pressure

used to determine the

and volume in refrigeration and

performance of a

air conditioning systems.

refrigerant.

3.10.  Gas law, Boyles law, Charles

law and Dalton’s law.

3.11.

Calculations involving general

gas law. Formulae:-

- P1 V1 = P2V2

- P1 =

P2

T1

T2

- V1 = V2

- T1

T2

- P1 V1 = P2V2

T1

T2

(a)

Introduction to

4.1.

Refrigeration cycle – Evaporation,

refrigeration.

compression, condensation and

expansion.

4.2.

Layout diagram of refrigeration

systems.

4.3.

Types and applications of the

various forms of refrigeration.

4.4.

Principles of operation of forms

of refrigeration system.

4.5.

Functions of the component and

accessories e.g. relay, solenoid

valves, capacitors and

thermostat.

(b)

Refrigerants

4.6.

Definition and types of

4.6.1. Identification of

refrigerants

refrigerant by cylinder

colours.

4.7.

Chemical names and formulae.

4.8.

Properties and uses of

refrigerants.

4.9.   Refrigerants flow controls e.g.

TEV, AEV, capillary tube.

4.10.

Operations of refrigerant flow

controls.

(c)

Air-Conditioning

4.11.1. Demonstration of air

processes

4.11.

Psychometric properties of air.

conditioning principle

by sling

psychometer.

4.12.  The processes of air

conditioning: heating and

cooling.

4.13.

Latent and sensible heat,

4.13.1   Demonstration of the

saturated and super-saturated

difference between

vapour.

latent and sensible

heat by use of

methylated spirit on

human skin.

5.2

Construction of compressors.

5.3.

Working principles of

(b)

Condensers.

compressors.

5.4.

Construction of condensers.

5.4.1.

Demonstrate how to

service a

5.5.

Calculation of heat load on

condenser.

condensers.

5.6.  Types and functions of liquid

receiver and service valves.

5.7.  Principle of operation of liquid

receiver and service valves.

5.8.

Types of evaporators.

5.9.  Construction and services of

evaporators.

5.9.1.

Demonstrate how to

5.10. Working principles of

service evaporators

evaporators.

5.11.  Heat load estimates on

evaporators.

6.

Workshop practices.

(a)  Basic tools used in

6.1.

Basic tools – hacksaw, coil

refrigeration and

spring benders, reamers, tube

air-conditioning

cutters, etc.

workshops

6.2.

Tools and procedures for

6.2.1. Servicing of a window

servicing window unit air-

air-conditioner.

conditioner.

(b)

Fault diagnosis and

6.3.

Different methods of diagnosing

trouble shooting.

faults systematic and

observation.

6.4.

Common faults in refrigeration

systems and their symptoms –

leakage, faulty units, faulty

compressor, poor cooling

and

current leakage.

6.5.   Techniques of effective repairs

in refrigeration and air-

conditioning systems.

6.6.

Techniques of trouble shooting

in a given system.

(c)

Maintenance and

6.7.

Testing for leakages, polarity,

6.7.1. Demonstrate how to

Testing

insulation continuity, pressure

test for leakages,

and efficiency.

polarity continuity and

efficiency.

6.8.

Maintenance of compressors,

6.8.1.

Demonstrate how to

evaporators, motors,

repair faults in

condensers, valves,

compressors,

accumulators and contactors.

evaporators, motor

and condensers.

7

Installation processes

(a)  Piping, Ducting and

7.1.

Concept of piping, ducting and

Trunking

trunking.

7.2.

Piping a condenser and an

evaporator.

7.3.   Ducting, trunking and installation

7.3.1.  Installation of a

of air-conditioners.

split air-conditioner.

silver tape, dot-punch, bending

spring,

amaflex, hacksaw, PVC

pipes.

7.5.   Types, functions, operations and

(b)

Motors and

application of motors and

generators

generators.

7.6.

Installation procedures for

motors and generators.

7.7.

Maintenance of motors and

7.7.1  Servicing of motors

generators in a refrigeration

and generators.

system.

7.8.

Working principles of cold room.

(c)

Cold room

7.9.

Cold room installation