Abbreviations used in Air conditioning  drawings

 الاختصارات المستخدمة في مخططات التكيييف والتهوية


Letter A

ACH=Air Cooled Chiller

ADP=Apparatus Dew point

AFMS=Air Flow Measuring Station

AHU=Air Handling Unit

Letter B


B=Boiler

BDD=Back Draft Damper

BPS=Booster Pump Set

BTU=British Thermal Unit

BV=Butterfly Valve

Letter C

C=Condenser water supply

CH=Chiller

CHWS= Chilled Water Supply

CHWR= Chilled Water Return

HWS=Hot Water Supply

HWR=Hot Water Return

 CT=Cooling Tower

CR=Condenser water Return

CWS=Cold Water Supply

CWR=Cold Water Return

CU=Condensing Unit


Letter D

D=Drain

D=Damper

DL =Door Louver

DV = Disc Valve

DUC = Door Under Cut


Letter E

EAG=Exhaust Air Grille

ECD = Exhaust Ceiling Diffuser

EF=Exhaust Fan

EA D=Exhaust Air Duct

ER=Exhaust Register

EAT=Entering Air Temperature

EA V=Exhaust Air Valve

EA L=Exhaust Air Louver

Letter F

F/B=From below

FAD=Fresh Air Duct

FAG=Fresh Air Grille

F.F.L=Finish Floor Level



Letter H

H=Humidifier

HT=Humidistat

H/L =High Level

HP =Horse Power


Letter I

IU=Indoor Unit

Letter M

M=Motorized

M/S=Meter Per Second


Letter L

LPF=Lift Pressurized Fan

L/L=Low Level

LCD =Linear Ceiling Diffuser

L/S=Liter Per Second

LAT=Leaving Air Temperature


 Letter R

RAG = Return  Air Grille

RCD = Return  Ceiling Diffuser

RCP = Reflected Ceiling Plan

RO = Return Opening

Letter S

S= No of Diffuser Slots

SACD= Supply Air Ceiling Diffuser 

SAD= Supply Air  Duct

SH= Sensible Heat

SAG = Supply  Air Grille

SEF=Smoke Exhaust Fan

SPF=Smoke Pressurized Fan

SLS = Supply Linear Slot

SR=Supply Register

SP=Static Pressure

SF=Supply Fan

Letter P

  PD=Pressure Drop

  PL=Plenum Box

  PU=Package Unit

  PU-FR=Fresh Air cooled Package Unit




T=Thermostat

T/B=To Below

TYP. =Typical

                                                               Letter V

VF=Ventilation Fan