1Sp

One Speed

2SP

Two Speed

AirCond

Air Cooled Condenser

AS

Autosize

AT

Air Terminal

Blr

Boiler

Boil

Boiler

BT

Blow through (fan configuration)

CAV

Constant air volume

Chlr

Chiller

ChW-Crl

Chilled water controlled

Clng

Cooling

CoolTwr

Cooling Tower

COP

Coefficient of Performance

CSD

Constant Speed Drive (Pump)

DD

Dual Duct

Dist

District

DOAS

Direct outside air system

DSP

Dedicated Supply Plenum

DT

Draw through (fan configuration)

DVAV

Dual VAV

dxC

DX cooled (direct expansion)

EIR

Energy Input Ratio

Elec

Electric

elecH

electric heated

Flr

Floor

Furn

Furnace

gasH

gas heated

GHE

Ground Heat Exchanger

Gly

Glycol

HeatEx

Heat Exchanger

HP Wtr to Air

Heat Pump Water to Air

HPAta

Heat Pump Air to Air

HR

Heat recovery

HR

Humidity Ratio

HW

Hot Water

MedTemp

Medium Temperature

MxW

Mixed Water

No_ReH

No Reheat

OA

Outside air

Pc

constant-flow primary-only loop

PFPB

Parallel Fan Powered Box

Pri

Primary

PSZ

Packaged Single Zone

PTAC

Packaged Terminal Air Conditioner

PTHP

Packaged Terminal Heat Pump

Pv

variable-flow primary-only loop

R-134A

Refrigerant 134a

R-22

Refrigerant 22

R-404a

Refrigerant 404a

R744

Refrigerant 744

Radiant

Radiant cooling or heating (mostly with lower temperatures)

RadSlab

Radiant Slab

ReH

Reheat

RfgCond

Refrigeration Cooled Condenser

SD

Single duct

Sec

Secondary

SHW

Service hot water

SSD

Single Speed drive (pump)

SSP

Shared Supply Plenum

STM

Steam

TC

Temperature Controller

Temp

Temperature

Trans

Transcritical

Unctrl

Uncontrolled

UnitH

Unit Heater

VarPumps

Variable Pumps

VAV

Variable air volume

VC-Elec

Vapor Compression Electric

VRF

Variable Refrigerant Flow

VRF

Variable refrigerant Flow

VS

Variable Speed

VSD

Variable speed drive (pump)

WaterCond

Water Cooled Condenser

WindAC

Window Air Conditioner

WSHP

Water source heat pump

wtrC

water cooled

wtrH

water heated

wtrSTM

steam heated