Odisha CHSE +2 VOC Field Technician Air Conditioner key terms

The process of removing heat from a space or substance to lower its temperature below that of the surroundings and maintaining it there.

A refrigeration cycle in which a refrigerant is compressed, condensed, expanded, and evaporated to transfer heat from a low-temperature region to a high-temperature region.

Heat that changes the temperature of a substance without changing its state; for example, warming air from 20°C to 30°C.

Heat that changes the state of a substance without changing its temperature; for example, melting ice or boiling water.

A form of energy transferred between bodies because of a temperature difference; measured in joules or calories.

A fluid used in a refrigeration system that absorbs heat at low temperature and pressure and releases it at high temperature and pressure, usually by changing state.

A number that indicates how much a substance can destroy stratospheric ozone compared with CFC-11, which is assigned a value of 1.0.

A measure of how much heat a greenhouse gas traps in the atmosphere over a set period, relative to carbon dioxide, which has a GWP of 1.

A compound of chlorine, fluorine, and carbon once used as a refrigerant; it has high ozone depletion potential and is banned under the Montreal Protocol.

A refrigerant containing hydrogen, chlorine, fluorine, and carbon; it has lower ozone depletion potential than CFCs and is being phased out globally.

A refrigerant containing hydrogen, fluorine, and carbon; it does not deplete stratospheric ozone but often has significant global warming potential.

An international treaty adopted in 1987 that phases out the production and use of ozone-depleting substances such as CFCs and HCFCs.

A mechanical device that raises the pressure and temperature of refrigerant vapour so that heat can be rejected in the condenser.

A heat exchanger in which hot, high-pressure refrigerant vapour releases heat to the surroundings and condenses into a liquid.

A heat exchanger in which low-pressure refrigerant liquid absorbs heat from the space being cooled and evaporates into a vapour.

A device that reduces refrigerant pressure and regulates the flow of liquid refrigerant into the evaporator, often controlling superheat.

The amount by which the temperature of refrigerant vapour exceeds its saturation temperature at a given pressure; used to set expansion valve operation.

The amount by which the temperature of liquid refrigerant falls below its saturation temperature at a given pressure; indicates proper condenser operation.

A control device that senses room temperature and switches the air conditioning system on or off to maintain the set point.

The desired temperature or condition that a control system is adjusted to maintain.

A temperature-sensitive resistor whose resistance changes with temperature; used as a sensor in air conditioning control circuits.

An electrical component that stores charge and provides starting or running torque to motors such as compressors and fans in air conditioners.

An instrument that measures voltage, current, and resistance; used to test electrical components and circuits in air conditioning systems.

A set of gauges and valves used to measure high-side and low-side refrigerant pressures and to charge, recover, or evacuate a system.

A pump used to remove air and moisture from a refrigeration system before charging, creating a deep vacuum.

The process of removing air and moisture from a refrigeration system by means of a vacuum pump, usually measured with a micron gauge.

The process of finding refrigerant leaks using methods such as soap bubbles, electronic leak detectors, or pressure testing.

The removal of refrigerant from a system into a suitable container for storage, recycling, or disposal, without releasing it to the atmosphere.

The process of testing and adjusting a newly installed air conditioning system to ensure it operates safely and meets design specifications.

The work of positioning, assembling, and connecting air conditioning equipment and its piping, wiring, and ductwork at the site.

Scheduled servicing such as cleaning filters, checking refrigerant pressures, and tightening electrical connections to prevent breakdowns and maintain efficiency.

A systematic process of identifying the cause of a fault in an air conditioning system by observing symptoms, testing components, and comparing with normal values.

A screen or fibrous material that removes dust and particles from air passing through an air conditioning system; it must be cleaned or replaced regularly.

Clothing and gear such as gloves, goggles, and safety shoes worn to protect the technician from hazards while working on air conditioning systems.

Practices and rules followed to prevent accidents and injuries, including electrical isolation, safe handling of refrigerants, and proper use of tools.

The way a technician interacts with clients, including punctuality, clear communication, respect for property, and explaining the work performed.

Hands-on training in which learners perform tasks such as pipe bending, brazing, wiring, and system charging under supervision.

A structured assignment in which a learner plans, executes, and documents a practical air conditioning task, often including a report and presentation.