EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—110
Abbreviations and Definitions
AHU
Air Handlin
Unit; the central fan s
stem that includes
the blower, heatin
e
uipment, coolin
e
uipment,
ventilation air e
uipment, and other related e
uipment.
CO
Carbon Monoxide. Occasionall
used as a measure of
indoor air
ualit
.
CO
2
Carbon Dioxide. Often used as a measure of indoor air
ualit
.
CARE
Computer Aided Re
ulation En
ineerin
; the PC
based tool used to confi
ure C-Bus and L
ON
W
ORKS
Bus
devices.
C-Bus
Hone
well proprietar
Control Bus for
communications between EXCEL 5000
S
stem
controllers and components.
CPU
Central Processin
Unit; an EXCEL 5000
OPEN
SYSTEM controller module.
cUL
Underwriters Laboratories Canada
CVAHU
Constant Volume AHU; refers to a t
pe of air
handler with a sin
le-speed fan that provides a constant
amount of suppl
air to the space it serves.
DDF
Delta De
rees Fahrenheit.
D/X
Direct Expansion; refers to a t
pe of mechanical coolin
where refri
erant is
expanded
to its cold state, within a
heat-exchan
in
coil that is mounted in the air stream
supplied to the conditioned space.
Echelon
The compan
that developed the L
ON
W
ORKS
Bus
and the Neuron
chips used to communicate on the
L
ON
W
ORKS
Bus.
Economizer
Refers to the mixed-air dampers that re
ulate
the
uantit
of outdoor air that enters the buildin
. In
cool outdoor conditions, fresh air can be used to
supplement the mechanical coolin
e
uipment.
Because this action saves ener
, the dampers are
often referred to as
economizer dampers
.
EMI
Electroma
netic Interference; electrical noise that can
cause problems with communications si
nals.
E-Link
Refers to the Q7750A Zone Mana
er. This name is
used in internal software and in CARE software.
EMS
Ener
Mana
ement S
stem; refers to the controllers
and al
orithms responsible for calculatin
optimum
operational parameters for maximum ener
savin
s in
the buildin
.
EEPROM
Electricall
Erasable Pro
rammable Read Onl
Memor
; the variable stora
e area for savin
user
setpoint values and factor
calibration information.
Enthalpy
The ener
content of air measured in BTUs per
pound
KiloJoules per Kilo
ram
.
EPROM
Erasable Pro
rammable Read Onl
Memor
; the
firmware that contains the control al
orithms for the
Excel 10 Controller.
Excel 10 Zone Manager
A controller that is used to
interface between the C-Bus and the L
ON
W
ORKS
Bus.
The Excel 10 Zone Mana
er also has the functionalit
of an Excel 100 Controller, but has no ph
sical I/O
points.
NOTE: The Q7750A Zone Mana
er can be referred to as
E-Link in the internal software, CARE.
E-Vision
User interface software used with devices that
operate via the FTT L
ON
W
ORKS
Bus communications
protocol.
Firmware
Software stored in a nonvolatile memor
medium
such as an EPROM.
Floating Control
Refers to Series 60 Modulatin
Control of
a valve or damper. Floatin
Control utilizes one di
ital
output to pulse the actuator open, and another di
ital
output to pulse it closed.
FTT
Free Topolo
Transceiver.
IAQ
Indoor Air Qualit
. Refers to the
ualit
of the air in the
conditioned space, as it relates to occupant health and
comfort.
I/O
Input/Output; the ph
sical sensors and actuators
connected to a controller.
I x R
I times R or current times resistance; refers to Ohms
Law: V = I x R.
K
De
rees Kelvin.
Level IV
Refers to a classification of di
ital communication
wire. Formerl
known as UL Level IV, but
not
e
uivalent
to Cate
or
IV cable. If there is an
uestion about wire
compatibilit
, use Hone
well-approved cables
see Step
5 Order E
uipment section
.
L
ON
W
ORKS
Bus
Echelons L
ON
W
ORKS
network for
communication amon
Excel 10 Controllers.
L
ON
W
ORKS
Bus Segment
An L
ON
W
ORKS
Bus section
containin
no more than 60 Excel 10s. Two se
ments
can be
oined to
ether usin
a router.
NEC
National Electrical Code; the bod
of standards for
safe field-wirin
practices.
NEMA
National Electrical Manufacturers Association; the
standards developed b
an or
anization of companies
for safe field wirin
practices.
Node
A Communications Connection on a network; an
Excel 10 Controller is one node on the L
ON
W
ORKS
Bus
network.
NV
Network Variable; an Excel 10 parameter that can be
viewed or modified over the L
ON
W
ORKS
Bus network.
PC
An Personal Computer with Pentium processor capable
of runnin
Microsoft
Windows
95.
Pot
Potentiometer. A variable resistance electronic
component located on the T7770B,C or T7560A,B Wall
Modules; used to allow user-ad
usted setpoints to be
input into the Excel 5000 or Excel 10 Controllers.
