HVAC/PLUMBING GLOSSARY
ACRONYMS AND ABBREVIATIONS Acronyms, abbreviations, and technical terms used throughout this catalog are defined below.
Air Conditioner
Heating, Ventilation, and Air Conditioning
A/C
HVAC
Annual Fuel Utilization Efficiency
Integrated Energy Efficiency Ratio
AFUE
IEER
Air Conditioning, Heating, and Refrigeration Institute
Inches
AHRI
in
Air Handling Unit
Integrated Part Load Value
AHU
IPLV
American National Standards Institute
Kilowatts
ANSI
kW
American Society of Heating, Refrigerating, and Air-Conditioning Engineers Boiler Horsepower (also Brake Horsepower – see definitions in Glossary section)
Kilowatt-hours
ASHRAE
kWh
Liquid Petroleum or Propane
LP
BHP
1,000 BTUh
MBh
Manufacturer
Mfr.
British Thermal Units
BTU
New Construction
NC
British Thermal Units Per Hour
BTUh
Natural Gas
NG
Cubic Feet Per Minute
CFM
Oxygen
O 2
Carbon Monoxide
CO
Outside Air
OA
Carbon Dioxide
CO 2 COP
Parts Per Million
PPM
Coefficient of Performance
Permanent Split Capacitor
PSC
Computer Room Air Conditioner
CRAC
Pounds Per Square Inch Absolute
psia
Dry Bulb
DB
Pounds Per Square Inch Gauge
psig
Direct Current
DC
Packaged Terminal Air Conditioner
PTAC
Demand Controlled Ventilation
DCV
Packaged Terminal Heat Pump
PTHP
Domestic Hot Water
DHW
Return Air
RA
DesignLights Consortium
DLC®
Rooftop Unit
RTU
Department of Energy
DOE
Supply Air
SA
Direct Expansion
DX
Standard Cubic Feet Per Minute Seasonal Energy Efficiency Ratio
SCFM
Exhaust Air
EA
SEER
Electronically Commutated Motor
ECM
Square Feet
sq. ft.
Energy Efficiency Ratio
EER
Thermal Efficiency
TE
Efficiency or Effectiveness
Eff.
100,000 BTU
Therm
Energy Management System
EMS
Thermostat
T-Stat
Enthalpy
Enth
Uniform Energy Factor
UEF
Energy Recovery Ventilator
ERV
Variable Frequency Drive
VFD
Foot or Feet
Ft
Variable Speed Drive
VSD
Gallons Per Minute
GPM
Water Source Heat Pump
WSHP
Horsepower
HP
Week
wk
Heat Recovery Ventilator
HRV
Delta or Difference
Δ
Heating Seasonal Performance Factor
HSPF
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