AC

Air Conditioning

AC

Alternating Current

ACH

Air Changes per Hour

ACM

Asbestos Containing Material

AEE

Association of Energy Engineers

AFD

Adjustable Frequency Drive

AFUE

Annual Fuel Efficiency Ratio

AHU

Air Handling Unit

AI

Analog Input

AO

Analog Output

ASHRAE

American Society of Heating Refrigeration and Air Conditioning Engineers

B

Boiler

BACnet

A Data Communication Protocol for Building Automation and Control Networks

BAS

Building Automation System

BCA

Building Commissioning Association

BI

Backward Incline

BI

Binary Input

BO

Binary Output

BSLN

Baseline

BTU

British Thermal Unit

BTUH

Brtish Thermal Units / Hour

BY

Base Year

CAV

Constant Air Volume

CD

Cold Deck

CDD

Cooling Degree Days

CEM

Certified Energy Manager

CFC

ChloroFluoroCarbon

CFM

Cubic Feet per Minute

CH

Chiller

CHW

Chilled Water

CHWP

Chilled Water Pump

CHWR

Chilled Water Return

CHWRT

Chilled Water Return Temperature

CHWS

Chilled Water Supply

CHWST

Chilled Water Supply Temperature

CLF

Cooling Load Factor

CLTD

Cooling Load Temperature Difference

COP

Coefficient Of Performance

CRAC

Computer Room Air Conditioner

CT

Cooling Tower

CV

Constant Volume

CVRMSE

Coefficient of Variation of the Root Mean Square of the Error

CWP

Condenser Water Pump

CWR

Condenser Water Return

CWRT

Condenser Water Return Temperature

CWS

Condenser Water Supply

CWST

Condenser Water Supply Temperature

CY

Current Year

DA

Discharge Air

DB

Data Base

DB

Dry Bulb

DC

Direct Current

DCV

Demand Controlled Ventilation

DD

Degree Day

DDC

Direct Digital Control

DH

Duct Heater

DI

Digital Input

DO

Digital Output

DP

Dew Point

DP

Differential Pressure

DX

Direct Expansion

EAT

Entering Air Temperature

ECM

Electronically Commutated Motor

ECM

Energy Conservation Measure

ECO

Energy Conservation Opportunity

EDH

Electric Duct Heater

EEM

Energy Efficiency Measure

EER

Energy Efficiency Ratio

EF

Exhaust Fan

EH

Electric Heater

EMS

Energy Management System

ESCO

Energy Service Company

EUH

Electric Unit Heater

EWT

Entering Water Temperature

FC

Forward Curve

FCU

Fan Coil Unit

FIM

Facility Improvement Measure

FLA

Full Load Amps

FMS

Facility Management System

FPM

Feet Per Minute

FW

Feed Water

GPM

Gallons Per Minute

GUI

Graphical User Interface

HCFC

Hydrochlorocfuorocarbon

HD

Hot Deck

HDD

Heating Degree Days

HEPA

High Efficiency Particulate Arresting

HFC

HydroFluoroCarbon

HHV

Higher Heating Value

HHWP

Heating Hot Water Pump

HHWR

Heating Hot Water Return

HHWS

Heating Hot Water Supply

HL

High Limit

HPS

High Pressure Steam

HR

Heat Recovery

HRU

Heat Recovery Unit

HRV

Heat Recovery Ventilator

HSPF

Heating Seasonal Performance Factor

HVAC

Heating Ventilation and Air Conditioning

HWP

Hot Water Pump

HWR

Hot Water Return

HWS

Hot Water Supply

HWRT

Hot Water Return Temperature

HWST

Hot Water Supply Temperature

HX

Heat Exchanger

I/O

Input Output

IAQ

Indoor Air Quality

IPMVP

International Performance Measurement and Verification Protocol

IR

Infra-Red

LAT

Leaving Air Temperature

LHV

Lower Heating Value

LL

Low Limit

LON

Local Operating Network

LP

Low Pressure

LPS

Low Pressure Steam

LRA

Locked Rotor Amps

LWBT

Leaving Wet Bulb Temperature

LWT

Leaving Water Temperature

M&V

Measurement and Verification

MA

Mixed Air

MAT

Mixed Air Temperature

MCC

Motor Control Center

MUA

Make-up Air Unit

MX

Metrix Utility Accounting System

MZ

Multi-Zone

NC

Normally Closed

NEMA

National Electrical Manufacturers Association

NO

Normally Open

NPSH

Net Positive Suction Head

OA

Outside Air

OAP

Outside Air Percentage

OAT

Outside Air Temperature

ODP

Open Drip Proof

OWS

Operator Work Station

PC

Performance Contracting

PE

Professional Engineer

PH

Pre-Heat

PID

Proportional Integral Derivative

PRV

Pressure Relief Valve

PRV

Pressure Reducing Valve

PTAC

Packaged Terminal Air Conditioner

RA

Return Air

RF

Return Fan

RH

Reheat

RH

Relative Humidity

RPM

Revolutions Per Minute

RTD

Resistance Temperature Detector

RTU

Roof Top Unit

SA

Supply Air

SAT

Supply Air Temperature

SC

Shading Coefficient

SEER

Seasonal Energy Efficiency Ratio

SF

Supply Fan

SHFG

Solar Heat Gain Factor

SHR

Sensible Heat Ratio

SP

Set Point

SP

Static Pressure

SWP

Steam Working Pressure

T

Temperature

T

Thermostat

TEV

Thermostatic Expansion Valve

TOD

Time Of Day

TORR

Millimeter of Mercury (mmHg)

TXV

Thermostatic Expansion Valve

UH

Unit Heater

UV

UltraViolet

UV

Unit Ventilator

VAV

Variable Air Volume

VD

Volume Damper

VFD

Variable Frequency Drive

VSD

Variable Speed Drive

VSP

Variable Speed Pump(ing)

WB

Wet Bulb

WC

Water Column

YTD

Year To Date