HVAC GLOSSARY
Acronyms, abbreviations, and technical terms used throughout this catalog are defined below.
ACRONYMS AND ABBREVIATIONS
Air Conditioner
1,000 BTUh
A/C
MBh
Air-Conditioning, Heating, and Refrigeration Institute
Manufacturer
AHRI
Mfr.
Air Handling Unit
New Construction
AHU
NC
Boiler Horsepower (also Brake Horsepower — see definitions in Glossary section)
Natural Gas
BHP
NG
Oxygen
O 2
British Thermal Units
BTU
Permanent Split Capacitor
PSC
British Thermal Units Per Hour
BTUh
Pounds Per Square Inch Gauge
psig
Constant Air Volume
CAV
Packaged Terminal Air Conditioner
PTAC
Cubic Feet Per Minute
CFM
Packaged Terminal Heat Pump
PTHP
Carbon Monoxide
CO
Return Air
RA
Carbon Dioxide
CO 2
Rooftop Unit
RTU
Coefficient of Performance
COP
Supply Air
SA
Dry Bulb
DB
Standard Cubic Feet Per Minute Seasonal Energy Efficiency Ratio
SCFM
Direct Current
DC
SEER
Demand Controlled Ventilation
DCV
Square Feet
sq ft
Domestic Hot Water
DHW
Thermal Efficiency
TE
Direct Expansion
DX
100,000 BTU
Therm
Exhaust Air
EA
Thermostat
T-Stat
Electronically Commutated Motor
ECM
Variable Air Volume
VAV
Energy Efficiency Ratio
EER
Variable Refrigerant Flow
VRF
Efficiency or Effectiveness
EFF
Variable Frequency Drive (aka VSD)
VFD
Enthalpy
Enth
Week
wk
Energy Recovery Ventilator
ERV
Delta or Difference
Δ
Foot or Feet Horsepower
Ft
HP
Heat Recovery Ventilator
HRV
Heating Seasonal Performance Factor
HSPF
Heating, Ventilation, and Air Conditioning
HVAC
Integrated Energy Efficiency Ratio
IEER
Inches
in
Integrated Part Load Value
IPLV
Kilowatts
kW
Kilowatt-hours
kWh
Makeup Air Unit
MAU
45
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