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