Honeywell W7761A - Manual (Page 4)

EXCEL 10 W7761A INPUT/OUTPUT DEVICE
4 74-2699
Control Application
The W7761A, Excel 10 Remote Input/Output device, provides auxiliary inputs and outputs for use with an Excel 10 Zone
Manager and Excel 10 controllers over the Echelon
® LonWorks ® E-Bus. The W7761A Remote Input/Output Device can be
connected to outdoor air temperature and humidity sensors that can be used by other Excel 10 controllers on the E-Bus or
Excel 5000 controllers on the C-Bus through the Excel 10 Zone Manager. This would allow the controllers to use their physical
inputs for monitoring other elements such as return humidity, IAQ, etc. to achieve better control. The W7761A can be used to
average many space temperature sensors that are located in a zone that is controlled by the W7750 Constant Volume AHU
Controller. The W7761A device has 8 Digital Outputs which may be Discrete, Modulating or Floating. For example, this allows
the control of lighting zones, miscellaneous exhaust or ventilation fans, miscellaneous pumps, and can enable freeze
protection. See Fig. 2.
WINDOW CONTACT
OCCUPANCY
SENSOR
OA
TEMPERATURE
OA
HUMIDITY
MISC.
FANS
PUMPS
LIGHTING
CONTROL
EXCEL 10
W7761A
REMOTE
INPUT/OUTPUT
M12885
EXCEL 10 T7770
WALL MODULE
Fig. 2. Typical W7761A control application.
Control Provided
The W7761A was not intended to control staged or modulating heating/cooling coils, mixed air economizer dampers, or system
fan/heat pump units. The W7761A contains inputs and outputs, but no control software. All control that would be associated
with the inputs and outputs in the W7761A would be accomplished though the Excel Zone Manager and would not be suitable
for VAV control, temperature control, or any control function that would require less than a 30 second update rate.
Products Covered
This System Engineering Guide describes how to apply the W7761A Excel 10 Remote Input/Output Device and related
accessories to typical applications. The specific devices covered include:
• W7761A Remote I/O device.
• T7770 A through D Wall Modules.
• Q7750A Excel 10 Zone Manager.
• Q7751A Router (FTT to FTT only).
• Q7752A Serial Interface Adapter.
• Q7740A,B Repeaters (2-way and 4-way).
• 209541B FTT Termination Module.
Organization of Manual
This manual is divided into three basic parts: the Introduction, the Application Steps, and the Appendices that provide
supporting information. The Introduction and Application Steps 1 through 5 provide the information needed to make accurate
material ordering decisions. Application Step 6 and the Appendices include configuration engineering that can be started using
Excel E-Vision PC Software after the devices and accessories are ordered. Application Step 7 is troubleshooting.
The organization of the manual assumes a project is being engineered from start to finish. If an operator is adding to, or is
changing an existing system, the Table of Contents can provide the relevant information.
Applicable Literature
The following list of documents contains information related to the Excel 10 W7761 Remote I/O Device and the EXCEL 5000®
System in general.
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