Table of Content
 

 

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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