HVAC/R Definitions

A B C D E F G H I K L M N O P R S T U V W

A

Absolute Zero Temperature
Absorption System
Across the Line Start
Accumulator
Alternating Current
Alumina
Ambient Temperature
Ammonia
Amperage
Ampere

 

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B

Brazed Plate Heat Exchanger
BTU
BTUH

 

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C

Calorie
Capacitor
Capacitor - Run
Capacitor - Start
Capillary Tubing
Cascade System
Celsius - Scale
Centigrade
CFC
CFM
Check Valve
Coefficient of Performance - COP
Compression Ratio
Compressor
Compressor - Centrifugal
Compressor - Hermetic
Compressor - Multi Stage
Compressor - Open Drive
Compressor - Reciprocating
Compressor - Rotary
Compressor - Screw
Compressor - Scroll
Compressor - Semi Hermetic
Compressor - Tandem
Compressor - Two Speed
Compound Refrigeration
Condense
Condenser
Condensing Pressure
Condensing Temperature
Contactor
Contactor - Definite Purpose
Contactor - General Purpose
Contactor - Resistive Rating
Convection Heat
Coulomb
Crankcase Pressure Regulator - CPR
Cryogenics
Cupro-nickel
Current
Current Relay

 

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D

Defrost Control
Defrost Cycle
Desiccant
Desuperheat
Dew Point
Differential
Direct Current
Discharge Line
Discus Valve
Drier
Dry Bulb Temperature
Dry Ice

 

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E

Electricity
Electrolysis
Electromotive Force - EMF
Energy Efficiency Ratio - EER
Enthalpy
Evacuation
Evaporation
Evaporator
Evaporator Cooler
Evaporator Pressure Regulator - EPR
Expansion Valve
Expansion Valve - Automatic AEV
Expansion Valve - Balanced Port
Expansion Valve - Bi-Flow
Expansion Valve - Electric EEV
Expansion Valve - Externally Equalized
Expansion Valve - Heat Pump
Expansion Valve - Internally Equalized
Expansion Valve - Pressure Limited - MOP
Expansion Valve - Thermostatic TEV

 

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F

Fahrenheit Scale
Fan Cycle Control
FLA - Full Load Amps
Flash Gas
Flash Point
Flood Back
Flooded System
Foaming
Freezer Burn
Freeze Up
Frost Back
Fusible Plug

 

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G

Gas
Gas, Noncondensable
Ground Wire

 

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H

Halogens
Head Pressure
Head Pressure Control
Heat
Heat Exchanger
Heat of Fusion
Heat of Respiration
Heat Load
Heat Pump
Heat Transfer
HCFC
HFC
Hertz - HZ
High Pressure Control
High Side
Horsepower
Hot Gas Bypass
Humidity

 

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I

IAQ
Insulation

 

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K

Kelvin Scale
Kilowatt
King Valve

 

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L

Latent Heat
Liquid Line
Low Ambient Control
Low Pressure Control
Low Side
LRA - Locked Rotor Amps

 

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M

Maximum Fuse Size
MBH
MCC
Megohm
Metering Device
Microfarad
Micron Gauge
Miscibility
Modulating
Moisture Indicator
Motor, Four Pole
Motor, PSC
Motor, Shaded Pole
Motor, Six Pole
Motor, Split Phase
Motor, Two Pole
Motor Burnout
Mullion Coil

 

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N

Nonferrous

 

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O

Ohm
Ohm's Law
Oil Separator
Overload Protector
Ozone
Ozone Layer

 

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P

Part Wind Start
Peltier Effect
Potential relay
PSI
PSIA
PSIG
Psychrometer
Psychrometric Chart
Pump Down

 

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R

Radiant Heat
Receiver
Refrigerant
Refrigeration
Register
Relative Humidity
Relay
Relay, Start
Relief Valve
Resistance
Reverse Cycle Defrost
Reversing Valve
RLA
Rotor
RPM
Run Time - Refrigeration Equipment
Run Winding

 

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S

Saturated Refrigerant
Seasonal Energy Efficiency Ratio - SEER
Sensible Heat
Service Valve
Service Factor
Shell and Tube Condenser
Short Cycling
Sight Glass
Silica Gel
Single Phase
Sling Psychrometer
Slugging
Solenoid Valve
Specific Gravity
Specific Heat
Split System
Start Winding
Stator
Steam
Subcooled Refrigerant
Subcooler
Sublimation
Suction Line
SuperHeat
Superheated Refrigerant
Swamp Cooler

 

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T

TD
Temperature
TEV
Thermistor
Thermocouple
Thermodisk
Thermodynamics
Thermoelectric Refrigeration
Thermostat
Three Phase
Ton of Refrigeration
Transducer
Transformer
Transformer, Buck and Boost
Transistor
Tube in Tube Condenser
TXV

 

U

Ultraviolet

 

V

Vacuum
Valve Plate
Vapor
Vapor Barrier
Vapor Lock
Velocity
Voltage
Volt

 

W

Water Valve
Watt
Wax
Wet Bulb
Wet Bulb Temperature