Safety Practice –fire extinguishers

• Fuel
• Heat
• Oxygen
• Starving
• Smothering
• Cooling
• Removing one of these factors will extinguish the fire
• Extinguishing firs

Common basic Refrigeration tools and functions

• Pressure gauges
• Compound gauge
• Thermometer
• Soap bubble method
• Sling psychrometer

Setting of Oxy –Acetylene flame

• Fuel gases used in welding
• Supporter of combustion gas
• Temperature and uses of gas lame combinations oxy –acetylene gas flame
• Oxy – hydrogen gas flame
• Oxy –liquid petroleum gas flame
• Oxy –coal gas flame
• The most commonly used gas flame combination is OXY –ACETYENE
• Flame types
• Neutral flame
• Characteristics
• Uses
• Oxidizing flame
• Characteristics

Tubing –Cutting and bending methodology

• Types of tubing
• Soft copper tubing
• Hard drawn copper tubing
• Steel tubing
• Stainless steel tubing
• Plastic tubing
• Flexible tubing  
• Tube cutting
• Bending tubing

Swaging

• Swaging on copper tubing

Flaring flare fitting and testing the joints

• Flaring necessity
• Types of flaring
• Single thickness flare
• Flared tubing fitting

Efficiency and testing of commercial reciprocating compressor

• Efficiency of a compressor
• Mechanical efficiency
• Compression ratio
• Volumetric efficiency
• Performance factor
• Break horse power
• Reciprocating compressor as Vacuum pump
• Checking of external drive compressor
• Compressor testing methods
• Types of Reciprocating compressor
• According to the working position of cylinder
• According to the method of compression of the  gas
• According to the number of times of compression of  gas
• According to the cooling the head of compressor
• Safety precautions

Measuring voltage and current using multimeter

• Multi-range meter
• Multi-meter
• Multimeter as AV VOLTMETER
• Multi-meter as AC AMMETER
• Resistance zero setting

Refrigerants – Hisotry, Classification, Environmental

• Refrigerants
• Refrigerants over the years
• Identifying Refrigerants by number
• Refrigerant-12
• Refrigerant- R-22
• Refrigerant-R-134A
• Refrigerant Cylinders and Valves
• Storage cylinders
• Returnable service cylinders
• Disposable cylinder
• Colour code for refrigerant cylinder
• Refrigerant cylinder valves
• HANDLING REFRIGERANTS
• Remember – refrigerant can be dangerous

Central Air – conditioning plant wiring circuit

• Motor
• Protective devices
• Fuses
• Thermal overloads
• Control sequence
• Interlocking circuit
• Control Relay

Temperature and pressure controls

• Types of pressure controls
• Purpose of the bellow type low pressure switch
• Liquid line solenoid valve
• The use, installation and point of electronic thermostat (controller)
• Indicators lead
• Parameter programming
• Description of the parameters
• Version
• Technical Data
• Installation
• Filling – up and dimensions of the models for paneled  fixing
• Dimensions of the models for surface fixing
• Wiring
• Operating or control type
• Operating messages
• Description
• Maintenance
• Cleaning

High pressure safety cutout, Safety value and Oil pressure cut out

• High pressure cut out and functions
• High pressure safety cut – out
• High pressure cut-out and functions
• Types of pressure controller
• Bellow type
• Bourdon tube type
• Range and differential of a pressure switch
• Differential pressure controller
• Use of safety valve or relief valve
• Fusable plug
• Oil pressure switch use

Classification of commercial compressors and the gasket

• Gaskets and its use
• Commercial compressors types
• Reciprocating compressors

Descaling in shell and tube condenser

• Method of descaling
• Tube expender
• TAPER BRASS PLUG

DRY Expansion Evaporators

• Dry expansion type evaporators
• Expansion shell and tube chillers
• Construction and function
• Maintenance of dry type chillers
• Advantages in dry-type chillers
• Direct and indirect expansion evaporator

Transfer refrigerant to shell and Tube condenser

• Purging the air from the system
• Pump down the system is also useful

Air Handling Units and Air Washer in Air-conditioning plants

• Necessity of de-scaling in chilled water coils
• De-scaling in AHU and air-washers
• The arrangement of AHU in Air-conditioning plant
• Fan Coil Units
• Air-washer’s applications in Air-conditioning plant

Water circulation pumps

• Centrifugal pump – parts and functions
• Dismantling
• The complete Service of the pump
• Replace or service
• Assembly process

Chilled water treatment

• Importance of water
• Corrosion
• Scale
• Fouling
• Parameters to be analysed
• Control of parameters
• Molybdate
• Biends of molybdate
• Corrosion prevention
• Iron fouling
• Corrosion

Cooling Towers

• Cooling water process
• Atmospheric cooling is usually obtained by three methods
• Spray cooling ponds
• Cooling towers
• Open Tower
• Close Tower
• Natural draft cooling towers
• Forced draft cooling tower
• Induced Draft cooling Tower
• Algae
• The cooling effect can be increased by
• Limitations
• Range
• Approach
• Drift loss
• Evaporation loss
• Blow down
• Make up water

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