Vskills Certified AC Plant Mechanic

Vskills has developed a new strategic framework for Skill Development for early school leavers and existing workers, especially in the unorganized sector to improve their employability called Trade Employable Skills (TES).

Trade Employable Skills does effective assessment and certification of candidates in different trade disciplines like Electrical, Electronics, Agriculture, Chemical, Automobile, IT, etc to make them job ready.

Why should one take this certification?

To demonstrate clear understanding and practical aspects and to get a visible recognition for this knowledge.

Table of Content

https://www.vskills.in/certification/Vskills-Certified-AC-plant-Mechanic-Table-of-Content

Practice Test

https://www.vskills.in/test/

Companies that hire AC plant Mechanic

All small and medium companies need certified employees who have the requisite skills. There are more jobs opening up in the economy on a regular basis with the fast growth of the country.

Apply for Certification

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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

Certified AC Plant Mechanic

How It Works

Test Details

Benefits of Certification