National Instructional Media Institute (NIMI) creator DGT, MSDE, Govt of India text xxu Chennai National Instructional Media Institute 2010,c2010 monographic eng

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363 Contents : :: Practical :: -Use sling psychrometer and take wet /dry builb temperature reading -Check and find relative humidity by psychrometer chart -Check the air tempreture at ducts and grills -Check the humidifier and dehumidifier -Rough check the performance of A/C equipment -Measure the air flow with anemometer -Use inclined tube mono meter and measure air pressure -Check the air flow with pitot tube -Check air distribution in package A/C -Identify the components and Controls of package A/c -Servicing package Air conditioner -Troubleshoot package A/C for "Less cooling " -Troubleshoot and repair for the symptom "Insufficient air flow " -Troubleshoot for the symptom 'Compressor cut off through LP cut off" -Troubleshoot for the symptom " Unit trips frequently " -Operate the package A/C as per sequence -Check the leaks in package A/C -Clean the evaporator of package A/C -Arrest the leak in package A/C -Clean evaporator blower and check the motors -Trace the electrical wiring circuit of package A/C -Check and test high pressure (HP) cutout switch -Check and test low pressure (LP) cutout switch -Check the liquid line solenoid valve of package A/C -Check and test the thermostat in package A/C -Identify duct materials and understand duct layout drawings -Measure and fabricate duct as per layout drawing -Check and arrest air leak in ducts -Identify and check air filters -Clean the air filters -Check and replace air filters -Replace the damage portion of duct and insulation -Isolate and control the noise in AHU room -Arrest chilled water pipe and valve leak -Re-correct insulation faults of chilled water pipe -Service water control valve (Regulation valve) -Service duct line dampers -Install the compresser of A/C plant -Install the other components of A/C plant -Check the operation of electrical and mechanical components -Check the leak in A/a plant -Rectify the leaks in the system -Pressurise and check leak in the leak arrested system -Vacuumize the system ,to deep vacuum -Check the operation of the system as per safety procedure -Start and stop of A/C plant -Check and service heat exchanger -Check the service heat exchanger -Check leak and rectify in heat exchanger -Check the super heat and heat transfer efficiency of evaporator -Isolate the compressor from drive system -Remove commercial compressor from foundation -Dismantle the compressor -Check and rectify the problem in valve assembly -Check the fault and rectify in piston assembly -Check the piston ring and but clearance -Check and rectify the fault in cylinder liner -Check lubrication system of oil circulation -Check and service lub oil pump -Clean lub oil filter and add oil -Service the oil separator -Identify the types and parts of capacity control -Dismantle the capacity control -Service and assemble the capacity control -Check and service the bearings of the compressor -Check and service the shaft seal -Check and cut the gaskets for compressor -Assemble the compressor -Test the efficiency of the compressor -De-scale the water cooled condenser -Check the water flow and differential pressure in condenser -Check leakage in liquid receiver and condenser tubes -Check and service liquid line sight glass -Check the evaporatives condenser -Service the evaporative condenser -Check and service fan motor in evaporative condenser -Check the cooling tower system before servicing -Check and service cooling tower fan servicing -Check cooling tower and accessories -Service the water softening plant -Service the iron removing plant (Ion Exchange ) -Back wash the Ion exchangeing bed -Remove and repair the softner tank -Identify the parts of a centrifugal pump -Dismantle the water circulating pump -Repair and reassemble the pump -Test and adjust thermostatic expansion valve -Service brine chilling Evaporators -Service flooded type evaporator -Service suction liquid heat exchanger -Check the essential jobs in routine maintenance -Check the essential jobs in preventive maintenance -Operational maintenance in central A/C plant -Check the safety measures while the plant is in operation -Check the reading and record in log book :: Theory:: -Fundamental of central A/c Plant -Comfort air conditioning -Psychrometry -Psychrometric charts -Various types of central A C -Heat pumps -Unitary air conditioning system -Air flow and distribution -Package A/C system -Safety switches and controls of package air conditioner -Package unit's cooling tower and servicing -Leak detection in package A/C -Evacuation in package A/C -Refrigerant charging system -Testing of air-conditioning system -Electrical wiring of package A/c -Electrical components of package a/c -Electrical motor starting and safety devices -Safety controls and humidification devices -Duct system -Ducts and equipment /Systent balancing -Duct designing and arrangement -Air,vapour,gases and indoor air quality -Type of filters -Details of filters -Central station for air conditioning -Chilled water circulation -Modulation valves and expansion tank -introduction to load calculation -Sensible and latent heat -Heat source in an air-conditioning system -Method of leak detection in A C units -Dehydration and evacuation -Charging gas and testing the system -State of the refrigerant in vapour compression system -Possible Noise in A/c -Electrical measurements -Super heat and sub-cooling -Performance of reciprocating compressor -Volumetric efficiency of compressor -Air handling units and ducts -Compressor lubrication system -Various types of lubrication system -Compressor capacity control -Methods of capacity controls -Centifugal compressors -multistage -Construction and function of centifugal compressor -Purge and recovery system system -Capacity of the centrifugal plant -Lubrication of centrifugal system -Condenser and its types -Capacity of water cooler condenser -Selection of Condenser -Evaporative condenser -Function of evaporative condenser -Cooling tower -Types of cooling towers -Cooling tower approach -Water conditioning -Water scale and control methods -Principles of working of a water pump -Commonly faced problem in water pump -Refrigerant control devices -Types -Functions -Construction of thermostatic expansion valve -water /brine chiller -Secondary refrigerants -Suction liquid heat exchangers -Preventive maintenance -Operation and maintenance -Seasonal shut-down and maintenance Refrigeration & Air Conditioning : Centres of Excellence Air Conditioning Plant 621.58 CEN COE25 National Instructional Media Institute (NIMI) BSDU 170630 20190507135848.0 003675 English