Main
SYSTEM ENGINEERING
Excel 10
W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
Contents
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List of Figures
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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
List of Tables
INTRODUCTION
Excel 10 W7750A,B,C Constant Volume AHU Controller
Description of Devices
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
Control Application
Control Provided
floating type
-+
Products Covered
Organization of Manual
Applicable Literature
Product Names
Agency Listings
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
Abbreviations and Definitions
economizer dampers
not
Construction
Controllers
it is intended that the cover never be removed
Fig. 3. Excel 10 W7750A Constant Volume AHU Controller.
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31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
W7750A
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Fig. 6. Excel 10 W7750C Constant Volume AHU Controller.
M17489
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31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
LONWORKS
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Inputs/Outputs:
Free1
Free1 Pulse On
Free1 Pulse Off
Wall Modules
Duct Sensor
Fig. 11. T7560A,B construction in in. (mm).
Fig. 12. C7770A construction in in. (mm).
Configurations
General
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Allowable Heating and Cooling Equipment Configurations
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do not
Occupancy Sensor
Window Open/Closed Digital Input
Wall Module Options
Dirty Filter Monitor
Indoor Air Quality (IAQ) Override
Modes of Operation
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APPLICATION STEPS
Overview
Step 1. Plan the System
Step 2. Determine Other Bus Devices Required
Step 3. Lay Out Communications and Power Wiring
Fig. 19. Wiring layout for one doubly terminated daisy-chain LONWORKS Bus segment.
Bus communi- cations wiring is Level IV 22 AWG (0.34 mm
Bus cable.
Do not use different wire types or gauges on the same LONWORKS
Bus cable. Make sure that neither of the LONWORKS
Power Wiring
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If the W7750 Controller is used on Heating and Cooling Equipment (UL 1995 U.S. only
Step 4. Prepare Wiring Diagrams
General Considerations
W7750 Controllers
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Y2
BUS
W
DI
AI
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. 36 or 37 to wire a pneumatic transducer to a W7750B or W7750C.
W7750B CONSTANT
CONTROLLER
WALL
+
W7750C CONSTANT
LONWORKS Bus Termination Module
W7750B,C CONSTANT
CONTROLLER
MMC325 PNEUMATIC TRANSDUCER
W7750C CONSTANT
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Fig. 39. LONWORKS Bus termination wiring options.
Step 5. Order Equipment
Information.
After compilin
a bill of materials throu
h completion of the previous application steps, refer to Table 11 for orderin
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Step 6. Configure Controllers
Step 7. Troubleshooting
Troubleshooting Excel 10 Controllers and Wall Modules
Temperature Sensor and Setpoint Potentiometer Resistance Ranges
Alarms
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
AlarmLogX
X
Broadcasting the Service Message
Assign ID
W7750 Controller Status LED
T7770C,D Wall Module Bypass Pushbutton and Override LED
T7560A,B Digital Wall Module Bypass Pushbutton and LCD Display Occupancy Symbols
APPENDICES
Appendix A. Using E-Vision to Commission a W7750 Controller.
Sensor Calibration
voltage/ current
can not
Appendix B. Sequences of Operation.
Common Operations
cannot
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=
When the W7750 Controller is in Standby mode, the economizer minimum position setting is
untimed
after
Temperature Control Operations
-+
three
ONE STAGE TWO STAGES THREE STAGES FOUR STAGES
not
heating
and
manual-reset
freeze
Appendix C. Complete List of Excel 10 W7750 Controller User Addresses.
User Address Index
Mappable User Addresses and Table Numbers
Failure Detect User Addresses and Table Numbers
User Address Indexes (all in alphabetical order)
Mappable User Addresses and Table Number
Failure Detect User Addresses and Table Number
nci
writes
if
needed
as allowed
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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
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Appendix D. Q7750A Excel 10 Zone Manager Point Estimating Guide.
Approximate Memory Size Estimating Procedure.
Direct Access
Appendix E. Sensor Data for Calibration.
Resistance Sensors.
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Voltage/Current Sensors.
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Fig. 60. Partial psychometric chart for a C7400A Solid State Enthalpy Sensor. See Fi
ENTHALPYBTU PER POUND DRY AIR
4 mA
C
B
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L
, and LONWORKS
and LONMARK
Corporation. LONMARK
, Neuron