Honeywell W7750A User Manual

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

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74-2958—1

Fig. 1. Typical system overview.  ................................................................................................................................................

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Fig. 2. Typical W7750 control application.  .................................................................................................................................

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Fig. 3. Excel 10 W7750A Constant Volume AHU Controller. ..................................................................................................... 12
Fig. 4. W7750A construction in in. (mm). ................................................................................................................................... 13
Fig. 5. Excel 10 W7750B Constant Volume AHU Controller. ..................................................................................................... 14
Fig. 6. Excel 10 W7750C Constant Volume AHU Controller.  .................................................................................................... 15
Fig. 7. W7750B,C construction in in. (mm). W7750C (shown) has three 4 to 20 mA analog outputs.) ..................................... 16
Fig. 8. DIN rail adapters.  ............................................................................................................................................................ 17
Fig. 9. Functional profile of L

ON

M

ARK

® RTU object details (variables not implemented in Excel 10 CVAHU

are greyed). .......................................................................................................................................................................  18

Fig. 10. T7770A,B,C,D construction in in. (mm). ....................................................................................................................... 20
Fig. 11. T7560A,B construction in in. (mm). ............................................................................................................................... 21
Fig. 12. C7770A construction in in. (mm). .................................................................................................................................. 21
Fig. 13. Fan with two stages of heating and two stages

of cooling. ..........................................................................................................................................................................  24

Fig. 14. Fan, modulating heating and modulating cooling. .........................................................................................................  24
Fig. 15. Heat pump with two compressors and auxiliary heat stage(s).......................................................................................  25
Fig. 16. Economizer control.  ...................................................................................................................................................... 25
Fig. 17. Modulating heat with pneumatic valve actuator. ............................................................................................................  26
Fig. 18. Connecting the portable operator terminal

to the L

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W

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® Bus.....................................................................................................................................................  29

Fig. 19. Wiring layout for one doubly terminated daisy-chain L

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W

ORKS

® Bus segment. ........................................................ 31

Fig. 20. Wiring layout for two singly terminated L

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W

ORKS

® Bus segments. ............................................................................  32

Fig. 21. NEMA class 2 transformer voltage output limits. ...........................................................................................................  34
Fig. 22. Power wiring details for one Excel 10 per transformer. .................................................................................................  34
Fig. 23. Power wiring details for two or more Excel 10s per transformer. .................................................................................. 34
Fig. 24. Transformer power wiring details for one Excel 10 used in UL 1995 equipment (U.S. only).........................................  35
Fig. 25. Attaching two or more wires at terminal blocks..............................................................................................................  36
Fig. 26. W7750B High-Side/Low-Side selectable switching and jumper location. ......................................................................  36
Fig. 27. Typical W7750A Controller AHU application wiring diagram. (For more information on note 2,

 refer to Fig. 25.)................................................................................................................................................................  38

Fig. 28. Typical W7750A Controller with separate transformer application wiring diagram.

(For more information on note 2, refer to Fig. 25.) ............................................................................................................  38

Fig. 29. W7750A Controller floating economizer damper wiring diagram. (For more information on note 2, refer to Fig. 25.)...  39
Fig. 30. Typical W7750B Controller with staged heating and cooling wiring diagram. (For more information on note 2, refer to Fig. 

25.) ....................................................................................................................................................................................  40

Fig. 31. W7750B Controller with floating heating, cooling and economizer wiring diagram. (For more information on note 2, refer 

to Fig. 25.) .........................................................................................................................................................................  40

Fig. 32. W7750B,C Controller PWM damper actuator wiring diagram. (For more information on note 2, refer to 

Fig. 25.) .............................................................................................................................................................................  41

Fig. 33. W7750B,C wiring diagram with 4 to 20 mA enthalpy sensors and digital inputs. (For more information on note 2, refer to 

Fig. 25.) .............................................................................................................................................................................  41

Fig. 34. W7750B,C wiring diagram with C7600C 4 to 20 mA solid state humidity sensor. (For more information on note 2, refer to 

Fig. 25.) .............................................................................................................................................................................  42

18. The AOs can be set to be reverse acting. (For more information on note 2, refer to Fig. 25.)....................................  42

(B shown, see triangle note 4). .........................................................................................................................................  43

Fig. 37. RP7517,B pneumatic transducer to W7750C. ...............................................................................................................  43
Fig. 38. Typical doubly terminated daisy-chain L

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W

ORKS

® Bus segment termination module wiring diagram. ..................... 44

ON

W

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® Bus termination wiring options.  ............................................................................................................... 45

Fig. 40. Temperature sensor resistance plots.............................................................................................................................  49
Fig. 41. Location of the Service Pin Button.................................................................................................................................  50
Fig. 42. LED location on W7750. ................................................................................................................................................  51
Fig. 43. The T7770C,D Wall Modules LED and Bypass pushbutton locations. ..........................................................................  51
Fig. 44. The T7560A,B Digital Wall Module Bypass pushbutton location. ..................................................................................  51
Fig. 45. LED and Bypass pushbutton operation.  ....................................................................................................................... 56
Fig. 46. Setpoint ramping parameters with ramp rate calculation...............................................................................................  57
Fig. 47. Setpoint ramping parameters with setpoint calculation..................................................................................................  58