EXCEL 10 W7761A INPUT/OUTPUT DEVICE
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74-2699
DDF - Delta Degrees Fahrenheit.
D/X - Direct Expansion; refers to a type of mechanical cooling where refrigerant is (expanded) to its cold state, within a
heat-exchanging coil that is mounted in the air stream supplied to the conditioned space.
E-Bus - Honeywell implementation of Echelon® LonWorks® network for communication among Excel 10 Controllers.
E-Bus Segment - An E-Bus section containing no more than 60 Excel 10s. Two segments can be joined together using a
router.
Echelon® - The company that developed the LON® bus and the Neuron® chips used to communicate on the E-Bus.
Economizer - Refers to the mixed-air dampers that regulate the quantity of outdoor air that enters the building. In cool outdoor
conditions, fresh air can be used to supplement the mechanical cooling equipment. Because this action saves energy,
the dampers are often referred to as
economizer dampers.
EMI - Electromagnetic Interference; electrical noise that can cause problems with communications signals.
E-Link - Refers to the Q7750A Zone Manager. This name is used in internal software and in CARE software.
EMS - Energy Management System; refers to the controllers and algorithms responsible for calculating optimum operational
parameters for maximum energy savings in the building.
EEPROM - Electrically Erasable Programmable Read Only Memory; the variable storage area for saving user setpoint values
and factory calibration information.
EPROM - Erasable Programmable Read Only Memory; the firmware that contains the control algorithms for the Excel 10
Controller.
Excel 10 Zone Manager - A controller that is used to interface between the C-Bus and the E-Bus. The Excel 10 Zone Manager
also has the functionality of an Excel 100 Controller, but has no physical I/O points.
NOTE:
The Q7750A Zone Manager can be referred to as E-Link in the internal software, CARE.
FCU - Fan Coil Unit.
Firmware - Software stored in a nonvolatile memory medium such as an EPROM.
Floating Control - Refers to Series 60 Modulating Control of a valve or damper. Floating Control utilizes one digital output to
pulse the actuator open, and another digital output to pulse it closed.
FTT - Free Topology Transceiver.
IAQ - Indoor Air Quality. Refers to the quality of the air in the conditioned space, as it relates to occupant health and
comfort.
I/O - Input/Output; the physical sensors and actuators connected to a controller.
I x R - I times R or current times resistance; refers to Ohm’s Law: V = I x R.
K - Degrees Kelvin.
Level IV - Refers to a classification of digital communication wire. Formerly known as UL Level IV, but
not equivalent to
Category IV cable. If there is any question about wire compatibility, use Honeywell-approved cables (see Step 5 Order
Equipment section).
NEC - National Electrical Code; the body of standards for safe field-wiring practices.
NEMA - National Electrical Manufacturers Association; the standards developed by an organization of companies for safe field
wiring practices.
Node - A Communications Connection on a network; an Excel 10 Controller is one node on the E-Bus network.
NV - Network Variable; an Excel 10 parameter that can be viewed or modified over the E-Bus network.
PC - An IBM compatible Personal Computer with 386 or higher processor and capable of running Microsoft® Windows™
Version 3.1.
Pot - Potentiometer. A variable resistance electronic component located on the T7770B,C Wall Module; used to allow user-
adjusted setpoints to be input into the Excel 10 Controller.
