Odisha CHSE +2 VOC Field Technician Air Conditioner study guide
Odisha CHSE +2 VOC Field Technician Air Conditioner · Work through your exam, one topic at a time.
The Odisha CHSE +2 Vocational Field Technician (Air Conditioner) credential is a higher-secondary vocational qualification for students and working technicians who want recognised, job-ready skills in servicing and installing split and window air conditioners. It suits learners who prefer hands-on trade work over purely academic streams, and it also gives practising helpers a route to formal certification. The Odisha CHSE +2 VOC Field Technician Air Conditioner study guide has 10 sections and about 2,791 words.
01Fundamentals of Refrigeration and Air Conditioning
This domain tests whether you understand why heat moves and how a vapour-compression machine moves it. Expect units and definitions (tonne of refrigeration, sensible versus latent heat, superheat, subcooling), cycle analysis (COP, Carnot COP), and basic psychrometry (DBT, WBT, dew point, RH).
318 words, about 2 min02Refrigerants
The exam expects you to place a refrigerant in its family from its number. R-22 (CHClF2) is an HCFC; R-134a, R-32 and R-410A are HFCs; R-290 (propane) and R-600a (isobutane) are hydrocarbons of safety class A3; R-717 is ammonia; R-744 is carbon dioxide.
281 words, about 1 min03Ozone Depletion and Safety
The ozone layer absorbs harmful UV-B. Chlorine and bromine atoms released from CFCs and HCFCs destroy ozone catalytically, so ODP is indexed to R-11 = 1.0.
299 words, about 1 min04Air Conditioning System Components and Controls
Every system has a compressor (raises pressure and temperature), condenser (rejects heat), expansion device (drops pressure, meters flow) and evaporator (absorbs heat). Around them sit the accessories: filter drier for moisture and debris, sight glass with moisture indicator, receiver, accumulator to protect the compressor from liquid, solenoid valve, and crankcase heater.
266 words, about 1 min05Installation, Commissioning and Testing
Site survey decides everything: indoor unit clearances, outdoor airflow, wall strength, drain fall and the electrical point. Follow the manual for minimum and maximum pipe length, maximum elevation and additional charge per metre; typical domestic splits allow 3–15 m of run and 5–10 m of level difference.
292 words, about 1 min06Maintenance, Servicing and Troubleshooting
A schedule earns marks: clean or replace filters monthly on dusty sites, clean coils, flush the condensate drain, check fan blades and bearings, tighten terminals, inspect contactor contacts for pitting, test capacitors, measure compressor current against nameplate RLA, verify charge by superheat or subcooling, and log everything. Maintenance prevents the failures that troubleshooting questions describe.
260 words, about 1 min07Electrical and Electronic Controls for AC
A domestic split is single-phase: phase, neutral and protective earth, with the earth sized and never switched. The compressor is fed through a contactor or relay, protected by an overload, with a run capacitor and sometimes a start capacitor with a PTC.
268 words, about 1 min08Tools, Instruments and Measuring Techniques
A manifold gauge set has blue (low side), red (high side) and a yellow centre port for the vacuum pump or charging. Use it for pressures, never as a vacuum gauge - evacuate to a micron gauge.
260 words, about 1 min09Workplace Safety, Environment and Customer Service
PPE includes safety shoes, gloves, goggles and a helmet for work at height. Isolate and lock out before electrical work, then verify dead with a tester.
295 words, about 1 min10Trade Practical and Project Work
Typical jobs: pipe cutting, bending, swaging and flaring to tolerance; brazing a joint that passes a pressure test; wiring a split unit to the diagram; leak testing; evacuation; charging by weight and by superheat; measuring and recording; and fault finding on a trainer. The project is usually a small installation or a fault-diagnosis report supported by readings.
252 words, about 1 min