HVAC Abbreviations
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- A - compressed air line or area
- ABC - above ceiling
- AC - air chamber, alternating current
- A/C - air conditioning
- AFF - above finished floor
- AFG - above finished grade
- AL - aluminum
- AMB - ambient
- AMP - ampere
- ARR - arrangement
- ATC - automatic temperature control, at ceiling
- ATM - atmosphere
- AUTO - automatic
- AUX - auxiliary
- AVG - average
- BBD - boiler blowdown
- BF - boiler feed
- BHP - boiler horsepower, brake horsepower
- BOD - bottom of duct
- BOP - bottom of pipe
- BOT - bottom
- BP - back pressure
- B & S - bell-and-spigot
- BSMT - basement
- BTU - British thermal unit
- BV - butterfly valve
- oC - degrees Celsius
- C - condensate line
- C to C - center to center
- CA - compressed air
- CAL - calorie
- CAP - capacity
- CD - condensate drain
- CF - chemical feed, cubic foot
- CFH - cubic feet per hour
- CFM - cubic feet per minute
- CI - cast iron
- CIRC - circular
- CL - center line
- CM - centimetre
- CM2 - square centimetre
- CO - clean out
- COL - column
- CONC - concrete, concentric
- CONN - connect, connection
- CONT - continuation
- CPVC - chlorinated polyvinyl chloride
- CR - condenser return
- CRW - chemical resistant waste
- CS - condenser supply
- CTR - center
- CU - cubic
- CU FT. - cubic feet
- CU IN. - cubic inches
- CV - check valve
- CW - cold water
- CWR - cold water riser
.
- D - drain, deep
- DB - dry bulb
- DDC - direct digital control
- DEG - degree
- DELTAT - temperature difference
- DET - detail
- DIA - diameter
- DISC - disconnect
- DN - down
- DP - dew point temperature
- DR - drain
- DWG - drawing
- EA - exhaust air, each
- EAT - entering temperature
- EATR – Exhaust Air Transfer Ratio - to identify the amount of exhaust air transferred to inlet air in an energy recovery ventilator
- E to C - end to center
- EER - energy efficient ratio
- EFF - efficiency
- EJ - expansion joint
- EL - elevation
- ELB - elbow
- ELEC - electrical
- ENT - entering
- ERV – Energy Recovery Ventilator
- ESP - external static pressure
- ET - expansion tank
- EVAP - evaporator
- EWT - entering water temperature
- EXH - exhaust
- EXP - expansion
- EXST - existing
- EXT - external
- oF - degrees Fahrenheit
- F - Fahrenheit
- FC - flexible connector, flexible connection
- FCO - floor clean out
- FD - floor drain
- FDW - feed water
- FEC - fire extinguisher cabinet
- FF - finish floor
- FG - finish grade
- FHC - fire hose cabinet
- FLA - full load amps
- FLR - floor
- FM - flow meter
- FO - fuel oil
- FOV - flush out valve
- FPM - feet per minute
- FPS - feet per second
- FS - flow switch, federal specs
- FT - foot, feet
- FTG - fitting
- FU - fixture unit
- FV - flush valve
.
- G - gram, gas line
- GA - gauge
- GAL - gallons
- GALV - galvanized
- GL.V - globe valve
- GND - ground
- GPD - gallons per day
- GPH - gallons per hour
- GPM - gallons per minute
- GPS - gallons per second
- GR - grain
- GV - gate valve
- GWH - gas water heater
- H2O - water
- HB - hose bibb
- HD - head
- Hg - mercury
- HGT - height
- HMD - humidity
- HORIZ - horizontal
- HP - horsepower
- HR - hour
- HRV – Heat Recovery Ventilator
- HTD - heated
- HTR - heater
- HW - hot water
- HWH - hot water heater
- HWR - hot water return, hot water riser
- HWS - hot water supply
- HWT - hot water tank
- HZ - herts
- ID - inside diameter
- IN. - inch
- INHg - inches of mercury
- INSUL - insulation
- INT - international
- INTL - internal
- IPS - iron pipe size
- IV - indirect vent
- IW - indirect waste
- J - joule
- K - kelvin
- KG - kilogram
- KM - kilometre
- KM2 - square kilometre
- KPA - kilo pascal
- KS - kitchen sink
- KW - kilowatt
- L - length, liter
- LAT - leaving air temperature
- LB. - pound
- LBF - pound-force
- LIQ - liquid
- LP - low pressure
- LRA - locked rotor amps
- LVL - level
- LVR - louver
- LWT - leaving water temperature
- M - meter
- M2 - square meter
- M TYPE - lightest type of rigid copper pipe
- MAN - manual
- MAT - mixed air temperature
- MAX - maximum
- MBH - thousand British thermal units per hour
- MFR - manufacturer
- MG - milligram
- MGD - millions gallons per day
- MIN - minimum or minute
- ML - milliliter
- MM - millimetre
- MM3 - cubic millimetre
- MPT - male pipe thread
- MTD - mounted
- MU - make up
- NA - not applicable
- NC - normally closed
- NEG - negative
- NIC - not in contact
- NO - normally open
- NPHP - name plate horsepower
- NPS - nominal pipe size
- NPSH - net positive suction head
- NTS - not to scale
- O - oxygen
- OA - outside air
- OAT - outside temperature
- OC - on center
- OD - outside diameter
- OED - open end duct
- OF - overflow
- OV - outlet velocity
- OZ. - ounce
.
- PA - pascal
- PC - plumbing contractor
- PCR - pumped condensate return
- PD - pressure drop
- PF - power factor
- PG - pressure gauge
- PL - plate
- PNEU - pneumatic
- PRESS - pressure
- PROP - propeller
- PRV - pressure reducing valve
- PSI - pounds per square inch
- PSIA - pound per square inch absolute
- PSIG - pound per square inch gauge
- PV - plug valve
- QTY - quantity
- RA - return air
- RAD - radius
- RAT - return air temperature
- RD - roof drain
- R/E - return and exhaust
- RECOV - recovery
- RED - reducer
- REF - reference
- RH - relative humidity
- REQD - required
- REV - revision
- RL - refrigerant liquid
- RLA - Rated Load Amperes
- RM - room
- RS - refrigerant suction
- RTN - return
- RV - relief valve
- S - switch
- SA - shock absorber, supply air
- SAT - supply air temperature
- SCH - schedule
- SDT - saturated discharge temperature
- SEC - seconds, secondary
- SENS - sensible
- SEP - separate
- SEQ - sequence
- SER - series
- SERV - service
- SF - service factor
- SHT - sheet
- SI - international systems of units
- SOL - solenoid
- SP - static pressure
- SPEC - specification
- SQ. - square
- SQ.FT. - square feet
- SS - stainless steel
- SSH - static suction head
- SST - saturated suction temperature
- STD - standard
- STH - static total head
- STL - steel
- SUCT - suction
- SPLY - supply
- SV - service
- SVH - static velocity head
- SW - service weight
- SWS - service water
- TD - temperature difference
- TDH - total dynamic head
- TEMP - temperature
- TH - thermometer
- THK - thick
- TP - total pressure
- TSP - total static pressure
- UF - under floor
- UH - unit heater
- V - vent, volt, volume
- VAC - vacuum
- VAV - variable air volume
- VB - vacuum breaker
- VCI - vacuum cleaning inlet
- VCL - vacuum cleaning line
- VEL - velocity
- VERT - vertical
- VIB - vibration
- VOL - volume
- VSD - variable speed drive
- VP - velocity pressure
- VTR - vent thru roof
- W - watt, width, wide
- WB - wet bulb
- WCO - wall clean out
- WG - water gauge
- WH - water heater
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