GLOSSARY
Accumulator - A shell device installed in the suction line of a HVAC system to prevent liquids from entering the compressor.
Air Conditioner - A device used to control temperature and humidity of the air.
AFUE – Annual Fuel Utilization Efficiency. This tells you how much energy is being converted to heat. If the AFUE is 90%, then 90% of the fuel is being used to warm your home. The remaining 10% is vented with the combustion gases.
Ambient temperature - The temperature surrounding an object.
Blower - similar to a fan used to push air.
BTU - British Thermal Unit - The amount of heat energy required to raise the temperature of one pound of water by one degree Fahrenheit.
Burner - A device in which the burning of fuel takes place.
Barometer- is used to measure atmospheric pressure.
Carbon Monoxide - Colorless, odorless, and poisonous gas produced when carbon or carbonaceous fuels incorrectly burnt.
Charging - to add a charge of refrigerant to a system.
Circuit Breaker - Safety device, which automatically opens an electrical circuit if overloaded.
Compressor - A refrigeration component that make a pressure difference in the system witch causes refrigerant to flow.
Counter Flow - Flow in opposite direction.
Damper - A device used to regulate to flow of air.
Defrost Cycle - Refrigerating cycle in which evaporator frost and is melted.
Defrost Timer – A device which shuts unit off the compressor long enough to permit ice and frost accumulation on evaporator to melt.
Degree Day - The number of degrees that the mean temperature for that day is below 65° F.
Duct- a device used to distribute air.
Efficiency - Output of a device, system, or activity, divided by the input necessary to create the output.
Evacuation – The removal of contaminants in a refrigeration system.
Flexible Duct - A duct that can be routed around obstacles by bending it gradually.
Float Valve - A valve that controls the level of a fluid by the means of the sensing element floating in the fluid.
Flue - Gas or air passage that usually depends on natural convection to cause the combustion gases to flow through it.
Gas Valve – A device for starting, stopping, or regulating flow of gas.
HSPF - Heating Seasonal Performance Factor. A measure of heat pump heating efficiency. The higher the rating, the more efficient the heat pump. The US government's established minimum HSPF rating for furnaces is 6.8%.
Humidifier – A device used to add humidity to a space.
Humidistat - A control which is operates the humidifier and is affected by changing humidity.
HVAC- Heating Ventilation and Air Conditioning
KWH - Kilowatt hours - Electrical term - 1 Kwh equals the use of 1000 watts for one hour.
Leak Detector - A device to locate refrigerant leaks.
Thermostat- A temperature sensitive device used to control HVAC systems.
Ton (of refrigeration) - The amount of heat energy (BTU’S) absorbed in the conversion of 1 Ton of ice to 1 ton of water over a 24hour period at 32oF.
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