HVAC Acronyms & HVAC Terms
This is a comprehensive list of HVAC Acronyms and HVAC Terms. High Performance HVAC is certain there are more terms and acronyms. If you know of something we missed please email us. Thanks!
AC - Air Conditioning or Alternating Current
ACCA - Air Conditioning Contractors Associations
AFUE - Annual Fuel Utilization Efficiency
AHU - Air Handling Unit
AI - Analog Input
AMCA - Air Movement and Control Association
AO - Analog Output
AQS - Air Quality Systems
ASHRAE - American Society of Heating, Refrigerating, and Air Conditioning Engineers
AV - Automatic Air Vent
AWG - American Wire Gage
B - Boiler
BACnet - Computer communication protocol for building automation systems and control networks
BAS - Building Automation System
BI - Binary Input
BMS - Building Management System
BO - Binary Output
BP - Backflow Preventer
BTU - British Thermal Unit
BTUh - Brtish Thermal Units per Hour
CAV - Constant Air Volume
CD - Cold Deck (also Condensation Drain)
CFC - ChloroFluoroCarbon
CFM - Cubic Feet per Minute
CHR - Chilled Water Return (can also have an S in front of the acronym which stands for Secondary when secondary water loops have secondary loops)
CHS - Chilled Water Supply (can also have an S in front of the acronym which stands for Secondary when secondary water loops have secondary loops)
CHWP - Chilled Water Pump (can also have an S in front of the acronym which stands for Secondary when secondary water loops have secondary loops)
CHWR - Chilled Water Return (can also have an S in front of the acronym which stands for Secondary when secondary water loops have secondary loops)
CHWS - Chilled Water Supply (can also have an S in front of the acronym which stands for Secondary when secondary water loops have secondary loops)
CO - Clean Out (also Carbon Monoxide)
COP - Coefficienct of Performance
CRAC - Computer Room Air Conditioner
CRAH - Computer Room Air Handler
CSR - Capacitor Start Capacitor Run
CV - Constant Volume
CWP - Condenser Water Pump
CWR - Condenser Water Return
CWS - Condenser Water Supply
DA - Discharge Air or Direct Acting
DAT - Discharge Air Temperature
DB - Dry Bulb or Dead Band
DC - Direct Current
DCBP - Double Check Backflow Preventer
DD - Degree Day
DDC - Direct Digital Control
DI - Digital Input
DO - Digital Output
DP - Differential Pressure
DPDT - Double Pole Double Throw
DPST - Double Pole Single Throw
DSI - Direct Spark ignition
DX - Direct Expansion
EDR - Equivalent Direct Radiation
EER - Energy Efficiency Ratio
EMF - Electromotive Force
EF - Exhaust Fan
EMCS - Energy Management Control System
EMS - Energy Management System
EP - Electric to Pnuematic
ERV - Energy Recovery Ventilator
EXV - Electronic Expansion Valve
FA - Fire Alarm
FAI - Fresh Air Intake
FCU - Fan Coil Unit
FD - Fire Damper
FLA - Full Load Amps
FPM - Feet Per Minute
FPVAV - Fan Powered Variable Air Volume Box
FS - Float Switch
F & T - Float & Thermostatic
GPM - Gallons per Minute
GWP - Global Warming Potential
HEPA - High Efficiency Particulate Arresting
HCFC - HydroChloroFluoroCarbon
HD - Hot Deck
HFC - HydroFluoroCarbon
HOA - Hand Off Auto
HP - High Pressure or Horse Power
HPS - High Pressure Steam
HRU - Heat Recovery Unit
HRV - Heat Recovery Ventilator
HSI - Hot Surface Ignition
HSPF - Heating Seasonal Performance Factor
HSTAT - Humidistat
HVAC - Heating, Ventilation, & Air Conditioning
HVAC&R - Heating, Ventilation, Air Conditioning, & Refrigeration
HWP - Hot Water Pump
HWR - Hot Water Return (can also have an S in front of the acronym which stands for Secondary when hot water loops have secondary loops)
HWS - Hot Water Supply (can also have an S in front of the acronym which stands for Secondary when hot water loops have secondary loops)
HWUH - Hot Water Unit Heater
HX - Heat Exchanger
HZ - Hertz
I/O - Input/Output
IAQ - Indoor Air Quality
IMC - International Mechanical Code
in. Hg - inches of mercury vacuum
in. WC - inches of Water Column
IRH - InfraRed Heater
JB - Junction Box
KO - Knock Out
KW - Kilowatts
LL - Low Limit
LP - Low Pressure or Liquified Petroleum
LPS - Low Pressure Steam
LRA - Locked Rotor Amps
LWCO - Low Water Cut Off
MA - Mixed Air
MAT - Mixed Air Temperature
MAU - Make-up Air Unit
MCC - Motor Control Center
MFD - Micro-Farad
MP - Motor Protector
MPT - Male Pipe Thread
MUW - Make-up Water
MV - Manual Air Vent
NC - Normally Closed
NEC - National Electric Code
NFPA - National Fire Protection Association
NO - Normally Open
NPT - National Pipe Thread
NTC - Negative Temperature Coefficient
OA - Outside Air
OAT - Outside Air Temperature
OP - Oil Pressure
ODP - Ozone Depletion Potential
PCB - Printed Circuit Board
PE - Pnuematic to Electric
PID - Proportional, Integral, & Derivative
PRV - Pressure Reducing Valve
PSC - Permanent Split Capacitor
PSIA - Pounds per Square Inch Absolute
PSIG - Pounds per Square Inch Gauge
PT - Pressure Temperature
PTAC - Portable Terminal Air Conditioner
PTC - Positive Temperature Coefficient
PWM - Pulse Width Modulation
RA - Return Air or Reverse Acting
RAT - Return Air Temperature
RF - Return Fan
RH - Relative Humidity
RPBP - Reduced Pressure Backflow Preventer (sometimes also seen as RPZ)
RPM - Revolutions Per Minute
RTU - Roof Top Unit
RV - Reversing Valve
SA - Supply Air
SAT - Supply Air Temperature
SCADA - Supervisory Control and Data Acquisition
SD - Smoke Damper
SEER - Seasonal Energy Efficiency Ratio
SF - Service Factor or Supply Fan
SH - Super Heat
SMACNA - Sheet Metal and Air Conditioning Contractors National Association
SP - Static Pressure or Set Point
SPDT - Single Pole Double Throw
SPST - Single Pole Single Throw
SV - Solenoid Valve
TD - Temperature Difference or Time Delay
TDS - Total Dissolved Solids
TH - Thermometer in a Thermowell
TEV - Thermostatic Expansion Valve (sometimes also seen as TXV)
Ton - ton of refrigeration effect
TSTAT - Thermostat
UH - Unit Heater
UMC - Uniform Mechanical Code
UV - Ultra-Violet or Unit Ventilator
VAV - Variable Air Volume
VFD - Variable Frequency Drive
VSD - Variable Speed Drive
VVT - Variable Volume/Temperature
W - Watt
WB - Wet Bulb
WC - Water Column
XFMR - Transformer
ZD - Zone Damper
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