National Instructional Media Institute (NIMI) creator DGT, MSDE, Govt of India text xxu Chennai National Instructional Media Institute 2013,c2008 monographic eng

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92 Contents : Practical -Strip out components from frost free refrigerator -Check electrical wiring in frost free refrigerator -Check and test defrost heater -Check and test Timer and thermostat in frost free refrigerator -Retroit CFC filled domestic Refrigerator with HFC’s -Retroit CFC filled domestic Refrigerator with Hidro Carbon refrigerant -Repair /Service of HFC filled domestic refrigerator -Repair /Service Hydrocarbon filled Domestic refrigerator -Dismantle window Air – conditioner -Identify and inspect the parts of window A/c -Check and service the components of window a/c -Check relative humidity of conditoned room Service and assemble window A/c -Check and service A/C blower motor -Leak test in window A/C -Clean & flush contamination in condenser and evaporator -Service air cooled condenser in window A/c -Practice of removal and replacement of capillary tube in room A/c -Check electrical wiring of window a/c by CSR circuit -Test compressor without relay in CSR circuit -Check electrical wiring of window A/c by PSC method -Dry Service of windos A/C -Leak test in condensor with pressur raise method -Leak test in evaporator with Vaccum Method -Braze the leak spots in window A/C -Immersion method for leak test -Evacute hermetic system in room air conditioners -Charge gas in room Air -Conditioner -Measure the velocity of air flow and tempressure of room A/C -Troubleshoot and repair for the symptom “Compressor does not starts “ -Troubleshoot and repair for the symptom “Compressor trips frequently“ -Troubleshoot and repair for the symptom “ Poor cooling “ and for the sub symptom “Evapourator coil frosing“ -Troubleshoot and repair for the symptom “Poor cooling “ and for the sub symptom “Unit running continuously “ -Troubleshoot and repair for the symptom “Water leakage in indoor unit “ Theory -Study of Frost free Refrigerators -Refrigeration system of Frost free Refregerators -Electrical components and their functions in a Frost free Refregerator -Study of wiring ,Automatic defrost ,heater , Timer fan motor and air duct system -Methodology of Retrofitting -Details of CFC filled refrigerator with Hydro Carbon blend -Refregerators using diffirent refrigerants -Introduction of Air -conditioning -Constructional details of window Air – conditioner -Air – Conditioning System -Air – Conditioning System -Electrical components of window air -conditioner -Split Air- conditioners -Split air – conditional and its constructional details -Comparision ,advantage and disadvantage of split A/c & Window A/C Air cooled condensers -Constructional details and selection of air cooled condensers -Air filters ,their types and specification -Air flow Measurements -Velocity meters -Principle of pipe sizing -Study of service valves -Defective window model Room Air – Conditioner - “Compressor does not start “ -Defects in windos model Air -Conditioner -”Compressor trip frequetly “ -Defects in window air -conditioner -”Poor cooling “ Evaporate coil frosting -Defects in window air -conditioner -”Poor cooling “ - unit runnig continuosly -Defects in Split type air -conditioner - ’’water leakage in indoor unit ’’ Refrigeration & Air Conditioning : Centres of Excellence Refrigeration 621.58 BAS COE27 National Instructional Media Institute (NIMI) BSDU 170701 20190503161732.0 English