Technical Talk
HVAC/R Dictionary
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Click on a letter then a word to show the definition:
Words & Definitions for the letter A
- Absolute Humidity
- Amount of moisture in the air, indicated in grains per cu.ft
- Absolute Pressure
- Gauge pressure plus atmospheric pressure(14.7 lb. per sq. in.)
- Accessible Hermetic
- Assembly of motor and compressor inside a single housing unit
- Accumulator
- Storage tank that receives liquid refrigerant from evaporator and prevents it from flowing into suction line before it changes to a vapor
- ACR Tubing
- Tubing used in air conditioning and refrigeration. Ends are sealed to keep tubing clean and dry
- Air Conditioner
- Device used to control temperature, humidity, and cleanliness of air in a conditioned space
- Air Conditioning
- Control of the temperature, humidity, air movement, and cleaning of air, in a confined space
- Air-Cooled Condenser
- Heat of compression is transferred from condensing coils to surrounding air
- Air Diffuser
- Grille designed to direct airflow in desired patterns
- Air Handler
- Fan-blower, heat transfer coil(evaporator), heater and housing
- Algae
- Low form of plant life found floating in condensate drain pans and lines
- Alternating Current
- Electric current in which direction of flow reverses or alternates. In US 60-cycle(Hertz) current direction reverses every 1/120th of second
- Ambient Temperature
- Temperature of fluid or air that surrounds an object on all sides
- Ammeter
- Electric meter, calibrated in amperes, used to measure current
- Amperage
- Electron or current flow of one coulomb per second past a given point in circuit
- Anemometer
- Instrument for measuring the rate of airflow or motion
- Anode
- Positive terminal of electrolytic cell
- Armature
- Part of an electric motor, generator or other devise moved by magnetism
- Aspect Ration
- Ratio of length to width of rectangular air grille or duct
- Aspirating Psychronometer
- Devise that draws sample of air through it in order to measure humidity
- Aspiration
- Movement produced in a fluid by suction
- A.S.T.M. Standards
- Standards issued by the American Society of Testing Materials
- Atmospheric Pressure
- Pressure that gasses exert on earth; measure in pounds per square inch
- Automatic Control
- Valve action reached through self-operated means, not requiring manual adjustment
- Automatic Defrost
- System of removing ice and frost from evaporators automatically
- Valve (AEV)
- Pressure-controlled valve that reduces high-pressure liquid refrigerant to low-pressure liquid refrigerant
