| abbrev | define |
|---|---|
| # | Number |
| A | Amperes |
| A/C | Air Conditioning |
| AC | Alternating Current or Automation College |
| ACC | Advanced Combustion Control |
| ACE | Application Control Environment |
| ACIDP | Advanced Control Interface Data Point |
| ACM | Alarm Configuration Manager |
| AFCI | Arc Fault Circuit Interrupter |
| AFM | Advanced Formula Manager |
| AGA | American Gas Association |
| AGC | Automatic Gain Control |
| AGI | Application Graphic Interface |
| AHU | Air Handling Unit |
| AI | Analog Input |
| AIC | Ampere Interrupting Capacity |
| AIChE | American Institute of Chemical Engineers |
| AL | Aluminum |
| AM | Application Module or Alarm Management |
| A-MC | Advanced Multifunction Controller |
| AMPC | Adaptive Multivariable Process Control |
| AMRI | Application Module Redundancy Interface |
| AO� | Analog Output |
| AOP | Annual Operating Plan |
| AOSM� | Analog Output Standby Manual |
| APAC | Asia-Pacific |
| APC | Advanced Process Control |
| APECS | Application Programming Environment for Control and Simulation |
| API | Application Programming Interface |
| APICS | American Production Inventory Control Society |
| APM | Advanced Process Manager |
| AR | Action Request |
| ASIC | Application Specific Integrated Circuit |
| ASM� | Abnormal Situation Management |
| ATC | Automatic Temperature Control |
| ATS | Automatic Transfer Switch |
| AU | Arithmetic Unit (number cruncher for processor) |
| AWG | American Wire Gauge |
| AxM� | Application Module X-Windows |
| B | |
| B&P� | Bid and Proposal |
| BBU | Battery Backup Unit |
| BC | Batch Controller |
| BCM | BizCalc Manager |
| BDW | Business Decision Week |
| BG | Benefits Guardianship |
| BG Max� | Benefits Guardianship Maximum |
| BGP | Benefits Guardianship Program |
| BGP Optima | Benefits Guardianship Program Optima |
| BGP Performa | Benefits Guardianship Program Performa |
| BGP Plus | Benefits Guardianship Program Plus |
| BIOS� | Basic Input/Output System |
| BIS | Business Information System |
| BMA | Blending Movement & Automation |
| BMM | Blending and Movement Management |
| BOS | Basic Operating System |
| BPC� | Blend Property Control (refinery software package) |
| BPCS | Basic Process Control System |
| BPS | Bits Per Second |
| BRC | Blend Ratio Control (refinery software package) |
| BTU | British Thermal Units |
| C | Conduit |
| C/B | Circuit Breaker |
| C/S | Client/Server |
| CAN | Controller Area Network |
| CAPEX | Capital Expenditure |
| CAT� | Customer Acceptance Test |
| CATV | Cable Television or Community Antennae Television |
| CB | Critical Branch |
| CB | Controller Box (TDC2000 Basic Controller) |
| CBM | Certified Ballast Manufacturer |
| CBM | Condition-Based Maintenance |
| CCFA� | Common Card File Assembly |
| CCM | Client Configuration Manager (CM50N) |
| CCP | Communication and Control Processor |
| CCR� | Continuous Catalytic Regeneration |
| CCT | Circuit (also: CIR, CKT) |
| CCTV | Closed Circuit Television |
| CD | Candela |
| CD� | Cross Direction Controls (Paper Machine) |
| CD-ROM | Compact Disk Read Only Memory |
| CE | Continuation Engineering |
| CE | Conformite (or Communaute) Europeene (mark indicating EC compliance) |
| CE� | Consulting Engineer |
| CE� | Configuration Engineer |
| CEE | Control Execution Environment |
| CEM | Continuous Emissions Monitor |
| CEMS� | Continuous Emissions Monitoring System |
| CFA�� | Card File Assembly |
| CFR�� | Code of Federal Regulations |
| CG | Computer Gateway |
| CGMP | Current Good Manufacturing Practice |
| CHP� | Combined Heat and Power |
| CI | Continuous Improvement |
| CIM | Computer Integrated Manufacturing |
| CIOM-A | Chassis Input/Output Modules � Series A |
| CIP | Critical Infrastructure Protection |
| CIR | Circuit (also: CCT, CKT) |
| CIU | Communication Interface Unit |
| CKT | Circuit (also: CCT, CIR) |
| CL� | Control Language |
| CL/AM� | Control Language for Application Module |
| CL/PM� | Control Language for Process Manager |
| CLF | Current Limiting Fuse |
| C-LINK� | Communications Link |
| CLM | Communications Link Module |
| CLM-BB� | Communications Link Module Bristol Babcock |
| CLM-T� | Communications Link Module TIWAY (Texas Instruments tank gauging) |
| CM | Commercial Management |
| CM�� | Control Module |
| CM50 | Computing Module |
| CMMI | Capability Maturity Model Integration |
| CMS� | Conformance Management Services |
| CNI | ControlNet Interface |
| CNM� | Control Network Module (620 LCS) |
| COC� | Certificate of Conformance |
| COE | Center of Excellence |
| COGS | Cost of Good Sold |
| COTS | Commercial Off-The-Shelf |
| CPA | Canada Pipeline Accessories |
| CPG | Consumer Packaged Goods |
| CPN� | Customer Priority Notice |
| CPT | Control Power Transformer |
| CPU� | Central Processing Unit |
| CRC | Cyclic Redundancy Checking |
| CRC� | Customer Response Center |
| CRP� | Certified Recycled Parts |
| CRT | Cathode Ray Tube |
| CSA | Canadian Standards Association |
| CSA� | Checklist, Summary and Approvals |
| CSA�� | Customer Support Automation |
| CSR | Corporate Social Responsibility |
| CT | Current Transformer or Cycle Time |
| CU | Copper |
| CU� | Control Unit |
| DAS� | Data Acquisition System |
| dB | Decibel |
| DC | Direct Current |
| DCIS | Distributed Control and Information System |
| DCS | Distributed Control System |
| DDE | Dynamic Data Exchange (Microsoft interface) |
| DDT�� | Data Definition Table |
| DE� | Digitally Enhanced |
| DFM | Design for Manufacturing |
| DFSS | Design for Six Sigma |
| DH | Data Hiway |
| DHB� | Data Hiway Bridge |
| DHI� | Data Hiway Interface |
| DHP | Data Hiway Port |
| DI | Digital Integration |
| DIA | Diameter |
| DNCF� | Dual Node Card File |
| DNPWR | Dual Node Power Supply Assemby |
| DOS | Disk Operating System |
| DP� | Differential Pressure |
| DSA | Distributed System Architecture |
| DTC | Digital Turbine Control |
| DTE | Data Terminal Equipment |
| DVM | Digital Video Manager |
| E&C | Engineering and Construction |
| E&I� | Engineering and Instrumentation |
| EB | Equipment Branch |
| EBR� | Experion Backup and Restore software |
| EC | Electrical Code or Electrical Contractor |
| EDI | Electronic Data Interchange |
| EF | Exhaust Fan |
| EH&S� | Environmental Health and Safety |
| EHB | Experion Hiway Bridge |
| EHM | Equipment Health Management |
| EHPM | Enhanced High-Performance Process Manager |
| EHS | Environment, Health and Safety |
| ELEV | Elevator |
| ELMM | Enhanced Logic Manager Module |
| EM | Emergency |
| EMEA | Europe, Middle East, Africa |
| EMI | Electromagnetic Interference |
| EMT | Electrical Metallic Tubing |
| ENIM | Enhanced Network Interface Module |
| EOS� | Enhanced Operator Station |
| EP | Emergency Power |
| EPC | Engineering�Procurement and Construction |
| EPDG | Enhanced Peripheral Display Generator |
| EPLCG | Enhanced Programmable Logic Controller Gateway |
| EPNI� | Enhanced Process Network Interface |
| EPO | Emergency Power Off (Button or Switch) |
| EPRI | Electric Power Research Institute (Palo Alto, CA) |
| EPROM | Erasable Programmable Read Only Memory |
| ERP | Enterprise Resource Planning (expanded MRP system from Atlantic Research Company) |
| ESD | Electrostatic Discharge |
| ESPC | Energy Saving Performance Contracting |
| ESVT� | Experion Server TPS |
| ETN | Enhanced TPS Node |
| EUCN | Enhanced Universal Control Network |
| EWC | Electric Water Cooler |
| F | Fuse |
| FA | Fire Alarm |
| FAA | Fire Alarm Annunciator |
| FAQ | Frequently Asked Questions |
| FAT | Factory Acceptance Test |
| FAX� | Facsimile Transmission |
| FC | Flow Conditioner |
| FCCU | Fluidized Catalytic Cracking Unit |
| FDCM | Field Device Configuration Manager, replaced by FDM |
| FDM | Field Device Manager |
| FDU | Field Demonstration Unit |
| FEED | Front-end Engineering Design |
| FEL | Front-End Loading |
| FERC | Federal Energy Regulatory Commission |
| FF | Foundation Fieldbus |
| FFGR | Fluid Gas Recirculation |
| FGS | Fire and Gas System |
| FI� | Field Instrumentation (transmitters, etc.) |
| FIFO | First In First Out |
| FIM | Fieldbus Interface Module |
| FLA | Full Load Amperes |
| FLM | Fieldbus Library Manager |
| FM | Factory Mutual |
| FMC | Flexible Metal Conduit |
| FOB | Free On Board (freight and insurance responsibility) or Factory Order Blank |
| FPA | Fire Protection Agency |
| FPD | Flat Panel Display |
| FSC | Fail Safe Controller |
| FSC� | Frame Sequence Check |
| FSD | Final System Definition |
| FT | Functional Transformation |
| FTA | Field Termination Assembly |
| FTB | Front Terminal Block |
| FTE | Fault Tolerant Ethernet |
| FTP� | File Transfer Protocol |
| FWME | Flow Weighted Mean Error |
| G | Ground |
| GFCI, GFI | Ground Fault Circuit Interrupter |
| GND | Ground |
| GRMC | Galvanized Rigid Metal Conduit |
| HOA | Hand-Off-Automatic Switch |
| HVAC | Heating, Ventilation, Air Conditioning |
| HZ | Hertz |
| IEEE | Institute of Electrical and Electronic Engineers |
| IG | Isolated Ground |
| IMC | Intermediate Metal Conduit |
| INT | Interlock |
| KCMIL | Thousand Circular Mils |
| KVA | Kilovolt-Amperes |
| KVAR | Kilovolt-Amperes Reactive |
| LFMC | Liquid Tight Flexible Metal Conduit |
| LRA | Lock Rotor Amps |
| LTG | Lighting |
| MC | Metal Clad Cable |
| MCB | Main Circuit Breaker |
| MCC | Motor Control Center |
| MCP | Motor Circuit Protection |
| MI | Mineral Insulated |
| MLO | Main Lugs Only |
| MW | Megawatt |
| NC | Normally Closed |
| NEC | National Electrical Code |
| NEMA | National Electrical Manufacturers Association |
| NFPA | National Fire Protection Association |
| NL | Night Light |
| NO | Normally Open or Number |
| P | Pole |
| PB | Push Button or Panic Button or Pull Box |
| PNL | Panel |
| PT | Potential Transformer |
| PWR | Power |
| QTY | Quantity |
| REQ | Required |
| RMC | Rigid Metal Conduit |
| RMS | Root Mean Squared |
| RNC | Rigid Non-Metallic Conduit |
| RTS | Remote Test Station |
| RTU | Roof Top Unit |
| SP | Spare |
| ST | Shunt Trip |
| SW | Switch |
| SYM | Symmetrical |
| TEL | Telephone |
| TGB | Telecommunications Grounding Busbar |
| TMCB | Thermal Magnetic Circuit Breaker |
| UG | Under Ground |
| UL | Underwriters Laboratory |
| V | Volt |
| VA | Volt-Ampere |
| VT | Voltage Transformer |
| W | Watt or Wire |
| WH | Water Heater |
| WP | Weather Proof |
| XFMR | Transformer |
Showing posts with tag: acronyms
| abbrev | define |
|---|---|
| A | Air or Compressed Air |
| AC | Air Conditioning or Alternating Current |
| ACCA | Air Conditioning Contractors Associations |
| ACD | Automatic Control Damper |
| ACH | Air Changes per Hour |
| ACM | Asbestos Containing Material |
| AD | Access Door |
| AEE | Association of Energy Engineers |
| AF | Air Foil |
| AFD | Adjustable Frequency Drive |
| AFUE | Annual Fuel Utilization Efficiency |
| AHU | Air Handling Unit |
| AI | Analog Input |
| AMCA | Air Movement and Control Association |
| AMP | Ampere |
| AO | Analog Output |
| AP | Access Panel |
| APD | Air Pressure Drop |
| AQS | Air Quality Systems |
| AS | Air Stream |
| ASHRAE | American Society of Heating, Refrigerating and Air Conditioning Engineers |
| ATC | Automatic Temperature Control |
| ATM | Atmosphere |
| AV | Automatic Air Vent |
| AWG | American Wire Gage |
| B | Boiler |
| BACnet | A Data Communication Protocol for Building Automation and Control Networks |
| BAS | Building Automation System |
| BCA | Building Commissioning Association |
| BDD | Back-Draft Damper |
| BHP | Brake Horsepower |
| BI | Backward Incline or Binary Input |
| BMS | Building Management System |
| BO | Binary Output |
| BOD | Bottom of Duct |
| BP | Backflow Preventer |
| BSLN | Baseline |
| BTU | British Thermal Unit |
| BTUH | Brtish Thermal Units / Hour |
| BY | Base Year |
| CAV | Constant Air Volume |
| CD | Cold Deck (also Condensation Drain) |
| CDD | Cooling Degree Days |
| CEM | Certified Energy Manager |
| CENT | Center or Centrifugal |
| CF | Cubic Feet |
| CFC | ChloroFluoroCarbon |
| CFM | Cubic Feet per Minute |
| CH | Chilled or Chiller |
| CHR | Chilled Water Return |
| CHS | Chilled Water Supply |
| 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 |
| CO | Carbon Monoxide or Clean Out |
| CONN | Connection |
| COP | Coefficient Of Performance |
| CRAC | Computer Room Air Conditioner |
| CRAH | Computer Room Air Handler |
| CSR | Capacitor Start Capacitor Run |
| CT | Cooling Tower |
| CTBD | Cooling Tower Blow Down |
| CUH | Cabinet Unit Heater |
| 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 |
| D | Drain |
| DA | Discharge Air or Direct Acting |
| DAT | Discharge Air Temperature |
| DB | Dry Bulb (Temperature) or Dead Band |
| DC | Direct Current |
| DCBP | Double Check Backflow Preventer |
| DCV | Demand Controlled Ventilation |
| DD | Degree Day |
| DI | Digital Input |
| DIA | Diameter |
| DIM | Dimension |
| DO | Digital Output |
| DP | Dew Point or Differential Pressure |
| DPDT | Double Pole Double Throw |
| DPST | Double Pole Single Throw |
| DSI | Direct Spark ignition |
| DX | Direct Expansion |
| EA | Each or Exhaust Air |
| EAHU | Exhaust Air Handling Unit |
| EAT | Entering Air Temperature |
| ECM | Electronically Commutated Motor or Energy Conservation Measure |
| ECO | Energy Conservation Opportunity |
| EDH | Electric Duct Heater |
| EDR | Equivalent Direct Radiation |
| EEM | Energy Efficiency Measure |
| EER | Energy Efficiency Ratio |
| EF | Exhaust Fan |
| EH | Electric Heater |
| EMCS | Energy Management Control System |
| EMER | Emergency |
| EMF | Electromotive Force |
| EMS | Energy Management System |
| EP | Electric to Pneumatic |
| ERV | Energy Recovery Ventilator |
| ESCO | Energy Service Company |
| ESP | External Static Pressure |
| ET | Expansion Tank |
| EUH | Electrical Unit Heater |
| EWT | Entering Water Temperature |
| EXH or EX | Exhaust |
| EXP | Expansion |
| EXT | External |
| EXV | Electronic Expansion Valve |
| F | Fahrenheit |
| F & T | Float & Thermostatic |
| FA | Free Area or Fire Alarm |
| FAI | Fresh Air Intake |
| FC | Forward Curve or Flexible Connection |
| FCU | Fan Coil Unit |
| FD | Floor Drain, Fire Damper, or Fire Department |
| FIM | Facility Improvement Measure |
| FLA | Full Load Amps |
| FLEX | Flexible |
| FLRDR | Floor Drain |
| FMS | Facility Management System |
| FPM | Feet Per Minute |
| FPS | Feet per Second |
| FPVAV | Fan Powered Variable Air Volume Box |
| FRP | Fiberglass Reinforced Plastic |
| FS | Flow Switch |
| FT | Feet |
| FTR | Fin Tube Radiation |
| FW | Feed Water |
| G | Gas |
| GA | Gauge |
| GAL | Gallons |
| GALV | Galvanized |
| GFU | Glycol Feed Unit |
| GPH | Gallons per Hour |
| GPM | Gallons Per Minute |
| GR | Grade |
| GUI | Graphical User Interface |
| GWP | Global Warming Potential |
| HB | Hose Bib (Connection) |
| HCFC | HydroChloroFluoroCarbon |
| HD | Head or 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 |
| HOA | Hand Off Auto |
| HP | High Pressure or Horse Power or High Point |
| HPS | High Pressure Steam |
| HR | Heat Recovery or Hour |
| HRU | Heat Recovery Unit |
| HRV | Heat Recovery Ventilator |
| HSI | Hot Surface Ignition |
| HSPF | Heating Seasonal Performance Factor |
| HSTAT | Humidistat |
| HTG | Heating |
| HVAC | Heating, Ventilation & Air Conditioning |
| HVAC&R | Heating, Ventilation, Air Conditioning & Refrigeration |
| HWP | Hot Water Pump |
| HWR | Hot Water Return |
| HWRT | Hot Water Return Temperature |
| HWS | Hot Water Supply |
| HWST | Hot Water Supply Temperature |
| HWUH | Hot Water Unit Heater |
| HX | Heat Exchanger |
| HZ | Hertz (Cycles per Second) |
| I/O | Input Output |
| IAQ | Indoor Air Quality |
| ID | Inside Diameter |
| IMC | International Mechanical Code |
| IN | Inches |
| in. Hg | inches of mercury vacuum |
| in. WC | inches of Water Column |
| IPMVP | International Performance Measurement and Verification Protocol |
| IR | Infra-Red |
| IRH | InfraRed Heater |
| JB | Junction Box |
| KO | Knock Out |
| KW | Kilowatt |
| LAT | Leaving Air Temperature |
| LB | Pound |
| LD | Linear Diffuser |
| LF | Linear Feet |
| LHV | Lower Heating Value |
| LL | Low Limit |
| LON | Local Operating Network |
| LP | Low Pressure or Liquified Petroleum |
| LPS | Low-Pressure Steam |
| LRA | Locked Rotor Amps |
| LUVR or LVR | Louver |
| LVDR | Louvered Door |
| LVG | Leaving |
| LWBT | Leaving Wet Bulb Temperature |
| LWCO | Low Water Cut Off |
| LWT | Leaving Water Temperature |
| M&V | Measurement and Verification |
| MA | Mixed Air |
| MAT | Mixed Air Temperature |
| MAU | Makeup Air Unit |
| MAX | Maximum |
| MBH | 1000 BTUH |
| MCA | Minimum Circuit Amps |
| MCC | Motor Control Center |
| MECH | Mechanical |
| MFD | Micro-Farad |
| MIN | Minimum |
| MP | Motor Protector |
| MPT | Male Pipe Thread |
| MU | Make-Up Water |
| MUA | Make-Up Air |
| MUW | Make-up Water |
| MV | Manual Air Vent |
| MX | Metrix Utility Accounting System |
| MZ | Multi-Zone |
| NC | Noise Criteria or Normally Closed |
| NEC | National Electric Code |
| NEMA | National Electrical Manufacturers Association |
| NFPA | National Fire Protection Association |
| NO | Normally Open |
| NOM | Nominal |
| NPSH | Net Positive Suction Head |
| NPT | National Pipe Thread |
| NTC | Negative Temperature Coefficient |
| OA | Outside Air |
| OAI | Outside Air Intake |
| OAP | Outside Air Percentage |
| OAT | Outside Air Temperature |
| OC | On Center |
| OD | Outside Diameter |
| OP | Oil Pressure |
| OV | Outlet Velocity |
| OWS | Operator Work Station |
| PC | Performance Contracting |
| PCB | Printed Circuit Board |
| PCF | Pounds per Cubic Foot |
| PD | Pressure Drop |
| PE | Professional Engineer or Pneumatic to Electric |
| PH | Pre-Heat or Phase |
| PID | Proportional, Integral & Derivative |
| PRV | Pressure Relief Valve or Pressure Reducing Valve |
| PSC | Permanent Split Capacitor |
| PSI | Pounds per Square Inch |
| PSIA | Pounds per Square Inch – Absolute |
| PSID | Pounds per Square Inch – Differential |
| PSIG | Pounds per Square Inch – Gauge |
| PT | Pressure Temperature |
| PTAC | Packaged Terminal Air Conditioner |
| PTC | Positive Temperature Coefficient |
| PVC | Polyvinyl Chloride |
| PWM | Pulse Width Modulation |
| R | Radius |
| RA | Return Air or Reverse Acting |
| RAT | Return Air Temperature |
| RET | Return |
| RF | Return Fan |
| RH | Relative Humidity or Reheat |
| RLA | Running Load Amps |
| RLF | Relief |
| RPBP | Reduced Pressure Backflow Preventer (sometimes also seen as RPZ) |
| RPM | Revolutions Per Minute |
| RTD | Resistance Temperature Detector |
| RTU | Roof Top Unit |
| RV | Reversing Valve |
| SA | Supply Air |
| SAT | Supply Air Temperature |
| SC | Shading Coefficient |
| SCADA | Supervisory Control and Data Acquisition |
| sCHR | Secondary Chilled Water Return |
| sCHS | Secondary Chilled Water Supply |
| sCHWP | Secondary Chilled Water Pump |
| sCHWR | Secondary Chilled Water Return |
| sCHWS | Secondary Chilled Water Supply |
| SCR | Screen |
| SCT | Saturated Condensing Temperature |
| SD | Smoke Detector or Smoke Damper |
| SE | Smoke Exhaust |
| SEER | Seasonal Energy Efficiency Ratio |
| SEN | Sensible |
| SF | Service Factor or Supply Fan |
| SFD | Combination Smoke / Fire Damper |
| SH | Super Heat |
| SHC | Sensible Heat Capacity |
| SHFG | Solar Heat Gain Factor |
| SHR | Sensible Heat Ratio |
| sHWR | Secondary Hot Water Return |
| sHWS | Secondary Hot Water Supply |
| 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 |
| SS | Stainless Steel |
| SUP | Supply |
| SV | Solenoid Valve |
| SWP | Steam Working Pressure |
| T | Temperature or Thermostat |
| TD | Temperature Difference or Time Delay |
| TDS | Total Dissolved Solids |
| TEFC | Totally Enclosed Fan Cooled |
| TEMP | Temperature |
| TEV | Thermostatic Expansion Valve (sometimes also seen as TXV) |
| TH | Thermometer in a Thermowell |
| TOD | Time Of Day |
| TON | 12,000 BTUH (Cooling Capacity) or ton of refrigeration effect |
| TORR | Millimeter of Mercury (mmHg) |
| TSP | Total Static Pressure |
| TSTAT | Thermostat |
| TXV | Thermostatic Expansion Valve |
| TYP | Typical |
| UC | Undercut (Door) |
| UH | Unit Heater |
| UMC | Uniform Mechanical Code |
| UV | Ultra-Violet or Unit Ventilator |
| V | Volts |
| VAV | Variable Air Volume |
| VD | Volume Damper |
| VEL | Velocity |
| VFD | Variable Frequency Drive |
| VSD | Variable Speed Drive |
| VSP | Variable Speed Pump(ing) |
| VVT | Variable Volume/Temperature |
| W | Watt |
| WB | Wet Bulb Temperature |
| WC | Water Column |
| WG | Water Gauge |
| WPD | Water Pressure Drop |
| WTD | Water Temperature Difference |
| XFMR | Transformer |
| YTD | Year To Date |
| ZD | Zone Damper |