HEAT VENTILATION AND AIR CONDITIONER SHORT FORMS

FULL FORM SHORT ANSWER

Make sure to check the front part of the drawings set
for abbreviations used inside the engineering drawings because
the list of abbreviations sometimes may vary from an office to another

A

AHU : AIR HANDLING UNIT
AC : Air Conditioning / ALTERNATIVE CURRENT
ACB : AIR CIRCUIT BREAKER
A : Air / Compressed Air
ACD : Automatic Control Damper
AD : Access Door
AF : Air Foil / Airofoil / Air flow
AMP : Ampere
AP : Access Panel
APD : Air Pressure Drop
AS : Air Stream
ATC : Automatic Temperature Control
ATM : Atmosphere

B

BDD : Back Draft Damper
BHP : Brake Horsepower
BI : Backwards Inclined
BOD : Bottom of Duct
BTU : British Thermal Unit
BTUH : BTU per Hour
BMS : BUILDING MANAGEMENT SYSTEM
BAS : BUILDING AUTOMATION SYSTEM

C

C : Celsius Temperature
CSU : CEILING SUSPENDED UNIT
CENT : Center / Centrifugal
CF : Cubic Feet
CFM : Cubic Feet per Minute
CH : Chilled / Chiller
CHW : Chilled Water
CHWR : Chilled Water Return
CHWS : Chilled Water Supply
CHWP : Chilled Water Pump
CO : Carbon Monoxide
CONN : Connection
CT : Cooling Tower
CTBD : Cooling Tower Blow Down
CUH : Cabinet Unit Heater
CWR : Condenser Water Return
CWS : Condenser Water Supply
CWP : Condenser Water Pump
CCTV : CLOSED CIRCUIT TELEVISION

D

D : Drain
DB : Dry Bulb Temperature
DEG : Degree
DDC : Direct Digital Control
DIA : Diameter
DIM : Dimension
DP : Differential Pressure
DC : DIRECT CURRENT
DOL : DIRECT ON LINE
DB : DISTRIBUTION BOARD

DX   :  Direct Expansion

E

ELCB : EARTH LEAKAGE CIRCUIT BREAKER
EA : Exhaust Air / Each
EAHU : Exhaust Air Handling Unit
EAT : Entering Air Temperature
EF : Exhaust Fan
EMER : Emergency
EMS : Energy Management System
ESP : External Static Pressure
ET : Expansion Tank
EUH : Electrical Unit Heater
EWT : Entering Water Temperature
EXH / EX : Exhaust
EXT : External
EXP : Expansion

F

F : Fahrenheit Temperature
FA : Fresh Air
FCU : FAN COIL UNIT
FA : Free Area / Fire Alarm
FC : Flexible Connection
FD : Floor Drain / Fire Damper / Fire Department
FLA : Full Load Amps
FLEX : Flexible
FLRDR : Floor Drain
FPM : Feet per Minute
FPS : Feet per Second
FRP : Fiberglass Reinforced Plastic
FS : Flow Switch
FT : Feet
FTR : Fin Tube Radiation

G

G : Gas
GA : Gauge
GAL : Gallons
GALV : Galvanized
GFU : Glycol Feed Unit
GPH : Gallons per Hour
GPM : Gallons per Minute
GR : Grade

H

HVAC : HEAT VENTILATION AND AIR CONDITIONER
HB : Hose Bib Connection
HD : Head
HP : Horsepower / High Point / High Pressure
HR : Hour
HRU : Heat Recovery Unit
HTG : Heating
HWP : Hot Water Pump
HWR : Hot Water Return
HWS : Hot Water Supply
HZ : Hertz Cycles per Second

I

ID : Inside Diameter
IN : Inches

K

KW : KILO WATT
KVA : KILO VOLT AMPERES

L

LAT : Leaving Air Temperature
LB : Pound
LF : Linear Feet
LD : Linear Diffuser
LP : Low Point / Low Pressure
LPS : Low Pressure Steam
LRA : Locked Rotor Amps
LUVR / LVR : Louver
LVDR : Louvered Door
LVG : Leaving
LWT : Leaving Water Temperature

M

M : Mass
MAX : Maximum
MBH : 1000 BTUH / Mega British Thermal Unit per Hour
MCA : Minimum Circuit Amps
MD : Motorized Damper
MECH : Mechanical
MIN : Minimum
MU : Make Up Water
MUA : Make Up Air
MCCB : MOLDED CASE CIRCUIT BREAKER
MCB : MINIATURE CIRCUIT BREAKER

N

NC : Noise Criteria / Normally Closed
NO : Normally Open
NOM : Nominal

O

OA : Outside Air
OAI : Outside Air Intake
OC : On Center
OD : Outside Diameter
ODP : Open Drip Proof
OV : Outlet Velocity

P

PCF : Pounds per Cubic Foot
PD : Pressure Drop
PH : Phase
PRV : Pressure Reducing Valve
PSI : POUND per SQUARE INCHES
PSIA : POUND per SQUARE INCHES Absolute
PSID : Pounds per Square Inch Differential
PSIG : Pounds per Square Inch Gauge
PVC : Polyvinyl Chloride
PAC : PRECISION AIR CONDITIONER
PCB : PRINTED CIRCUIT BOARD
PLC : PROGRAMMABLE LOGIC CONTROL

R

R : Radius
RA : Return Air
RET : Return
RH : Relative Humidity
RLA : Running Load Amps
RLF : Relief
RPM : REVOLUTION PER MINUTE / Rotation
RTU : Roof Top Unit

S

SA : Supply Air
SCR : Screen
SCT : Saturated Condensing Temperature
SD : Smoke Detector / Smoke Damper
SE : Smoke Exhaust
SEN : Sensible
SFD : Combination Smoke / Fire Damper
SHC : Sensible Heat Capacity
SP : Static Pressure
SF : Square Feet
SS : Stainless Steel
SUP : Supply
STP : SEWAGE TREATMENT PLANT

T

TR : TONNAGE OF REFRIGERANT
TON : 12000 BTUH Cooling Capacity
T : Temperature / Thermostat
TEFC : Totally Enclosed Fan Cooled
TEMP : Temperature
TSP : Total Static Pressure
TSTAT : Thermostat
TYP : Typical
TC : Temperature Control

V

V : Volts
VAV : VARIABLE ADJUSTABLE VALVE / Variable Air Volume
VD : Volume Damper
VEL : Velocity
VFD : VARIABLE FREQUENCY DRIVE
VCD : VOLUME CONTROL DUMBER
VRF : VARIABLE REFRIGERANT FLOW
VRV : VARIABLE REFRIGERANT VALVE

U

UC : Undercut Door
UPS : UNINTERRUPTIBLE POWER SUPPLY

W

WB : Wet Bulb Temperature
WC : Water Column
WG : Water Gauge
WPD : Water Pressure Drop
WTD : Water Temperature Difference

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