Page 2 - EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 72-2958—1 2 General Considerations .................................................................................. 35W7750 Controllers .......................................................................................... 36 FACTORY DEFAULT D...
Page 3 - List of Figures; ® RTU object details (variables not implemented in Excel 10 CVAHU
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 3 74-2958—1 List of Figures Fig. 1. Typical system overview. ................................................................................................................................................ 6 Fig. 2. Typical W7750 control application...
Page 5 - List of Tables
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 5 74-2958—1 List of Tables Table 1. Agency Listing. ............................................................................................................................................................. 9 Table 2. List of Differences in W7750...
Page 6 - INTRODUCTION; Description of Devices; Excel 10 W7750A,B,C Constant Volume AHU Controller
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 6 INTRODUCTION Description of Devices The W7750 is the Constant Volume Air Handling Unit (CVAHU) Controller in the Excel 10 product line family. The CVAHU is a L ON M ARK compliant device designed to control single zone and heat pump air...
Page 7 - Control Application; Bus network access; Control Provided; sensor or a
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 7 74-2958—1 Control Application W7750 systems in commercial buildings typically incorporate a packaged air handler system that delivers a constant volume of air at preconditioned temperatures to the zone being served. Each zone is usually serviced b...
Page 8 - Title
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 8 Like the W7751 VAV Box Controller, the W7750 Controller can monitor a space-mounted occupancy sensor, and a door/window contact. These inputs affect the operational mode of the controller (see Table 5 for a list of all possible modes of ...
Page 9 - Device
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 9 74-2958—1 Product Names The W7750 Controller is available in three models: • W7750A Constant Volume AHU Controller - W7750A Version. • W7750B Constant Volume AHU Controller - W7750B Version. • W7750C Constant Volume AHU Controller - W7750C Version...
Page 10 - Abbreviations and Definitions
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 10 Abbreviations and Definitions AHU Air Handling Unit; the central fan system that includes the blower, heating equipment, cooling equipment, ventilation air equipment, and other related equipment. CO Carbon Monoxide. Occasionally use...
Page 11 - Construction; Controllers
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 11 74-2958—1 PWM Pulse Width Modulated output; allows analog modulating control of equipment using a digital output on the controller. RTD Resistance Temperature Detector; refers to a type of temperature sensor whose resistance output changes ac...
Page 13 - PERFORMANCE SPECIFICATIONS
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 13 74-2958—1 Fig. 4. W7750A construction in in. (mm). PERFORMANCE SPECIFICATIONS Power:24 Vac with a minimum of 20 Vac and a maximum of 30 Vac at either 50 or 60 Hz. The W7750A power consumption is 6 VA maximum at 50 or 60 Hz. The W7750B,C power con...
Page 16 - Bus communications
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 16 Fig. 7. W7750B,C construction in in. (mm). W7750C (shown) has three 4 to 20 mA analog outputs.) Communications:The W7750A,B,C Controller uses a Free Topology Transceiver (FTT) transformer-coupled communications port running at 78 kilobi...
Page 17 - ® FUNCTIONAL PROFILE
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 17 74-2958—1 Fig. 8. DIN rail adapters. The FTT supports polarity insensitive free topology wiring. This frees the system installer from wiring using a specific bus topology. T-tap, star, loop, and mixed wiring topologies are all supported by this a...
Page 18 - ® RTU object details; The W7750A Unit supports the following hardware features:; Discharge Air Temperature:
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 18 Fig. 9. Functional profile of L ON M ARK ® RTU object details (variables not implemented in Excel 10 CVAHU are greyed). Environmental:Operating Temperature: -40 to 150°F (-40 to 65.5°C). Shipping Temperature:-40 to 150°F (-40 to 65.5°C)...
Page 19 - CAUTION; IMPORTANT
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 19 74-2958—1 Outdoor Air Humidity (W7750B,C only): Type: Voltage/Current.Supported Sensors: C7600B1000 and C7600B1018 (2 to 10V), C7600C1008 (4 to 20mA). Return Air Humidity (W7750B,C only): Type: Voltage/Current.Supported Sensors: C7600B1000 and C7...
Page 20 - Wall Modules
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 20 Wall Modules The T7770 or T7560 Wall Modules for the Excel 5000 and Excel 10 Controllers are available in a variety of configurations. The models T7770A1006 and T7770C1002 are shown in Fig. 10. The T7770B,D are the same physical size (s...
Page 22 - Configurations; General
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 22 Configurations General Tables 3 and 4 provide an overview of the Excel 10 W7750 configuration options. All W7750s are assumed to have a supply fan digital output. Additionally, Tables 3 and 4 list the general mechanical equipment option...
Page 24 - STAGED HEATING/COOLING CONTROL
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 24 Allowable Heating and Cooling Equipment Configurations Each W7750 device can control a variety of different types of mechanical cooling and heating equipment within roof top air handlers. See Fig. 13 through 17 for a conceptual overview...
Page 25 - Fig. 15. Heat pump with two compressors and auxiliary
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 25 74-2958—1 Fig. 15. Heat pump with two compressors and auxiliary heat stage(s). ECONOMIZER CONTROL Economizer control is available concurrently with any configuration in the W7750 when DOs are not all used by the heating and cooling equipment. Two...
Page 26 - Occupancy Sensor; Window Open/Closed Digital Input
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 26 available through Honeywell, or directly from the manufacturer, Mamac Systems (see Table 11 for ordering information). Fig. 17 depicts a typical W7750 System with modulating heating valve using a pneumatic valve actuator. Also see Fig. ...
Page 27 - Modes of Operation
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 27 74-2958—1 Dirty Filter Monitor The air filter in the air handler can be monitored by the W7750 and an alarm is issued when the filter media needs replacement. The two methods of monitoring the filter are: 1. Connecting a differential pressure swi...
Page 29 - APPLICATION STEPS; Overview; Fig. 18. Connecting the portable operator terminal; Description
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 29 74-2958—1 APPLICATION STEPS Overview The seven application steps shown in Table 6 are planning considerations for engineering an Excel 10 W7750 System. These steps are guidelines intended to aid understanding of the product I/O options, bus arran...
Page 30 - ® Bus Configuration Rules And Device Node Numbers.; Bus Layout; One L
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 30 Each L ON W ORKS Bus segment is set up with two unused nodes to allow for a CARE/E-Vision operator terminal to be connected to the L ON W ORKS Bus. Multiple CARE/E-Vision terminals can be connected to the L ON W ORKS Bus at the same tim...
Page 31 - Fig. 19. Wiring layout for one doubly terminated daisy-chain L
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 31 74-2958—1 Fig. 19. Wiring layout for one doubly terminated daisy-chain L ON W ORKS ® Bus segment. M17496 EXCEL 10VAV EXCEL 10VAV EXCEL 10 CVAHU EXCEL 10 CVAHU EXCEL 10 CVAHU EXCEL 10 CVAHU EXCEL 10VAV EXCEL 10VAV EXCEL 10VAV EXCEL 10Q7750A ZONE M...
Page 32 - Fig. 20. Wiring layout for two singly terminated; Power Wiring; POWER BUDGET CALCULATION EXAMPLE
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 32 Fig. 20. Wiring layout for two singly terminated L ON W ORKS ® Bus segments. NOTE: See the L ON W ORKS Bus Termination Module section for wiring details. IMPORTANT Notes on communications wiring: • All field wiring must conform to local...
Page 33 - LINE LOSS
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 33 74-2958—1 Table 8. VA Ratings For Transformer Sizing. For contactors and similar devices, the in-rush power ratings should be used as the worst case values when performing power budget calculations. Also, the application engineer must consider th...
Page 34 - Fig. 22. Power wiring details for one Excel 10 per
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 34 Fig. 21. NEMA class 2 transformer voltage output limits. Attach earth ground to W7750 Controller terminal 1. See Fig. 22, 23 and 24, 27 through 35. Fig. 22. Power wiring details for one Excel 10 per transformer. See Fig. 23. for wiring ...
Page 35 - Step 4. Prepare Wiring Diagrams; General Considerations
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 35 74-2958—1 Fig. 24. Transformer power wiring details for one Excel 10 used in UL 1995 equipment (U.S. only). IMPORTANT Notes on power wiring: • All field wiring must conform to local codes and ordi-nances or as specified on installation wiring dia...
Page 38 - Fig. 27. Typical W7750A Controller AHU application
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 38 Fig. 27. Typical W7750A Controller AHU application wiring diagram. (For more information on note 2, refer to Fig. 25.) Fig. 28. Typical W7750A Controller with separate transformer application wiring diagram. (For more information on not...
Page 39 - Fig. 29. W7750A Controller floating economizer damper
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 39 74-2958—1 Fig. 29. W7750A Controller floating economizer damper wiring diagram. (For more information on note 2, refer to Fig. 25.) NOTE: Digital outputs are configurable. The terminal locations for each function are user-selectable. The Network ...
Page 40 - Fig. 30. Typical W7750B Controller with staged heating
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 40 Fig. 30. Typical W7750B Controller with staged heating and cooling wiring diagram. (For more information on note 2, refer to Fig. 25.) Fig. 31. W7750B Controller with floating heating, cooling and economizer wiring diagram. (For more in...
Page 41 - enthalpy sensors and digital inputs. (For more
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 41 74-2958—1 Fig. 32. W7750B,C Controller PWM damper actuator wiring diagram. (For more information on note 2, refer to Fig. 25.) Fig. 33. W7750B,C wiring diagram with 4 to 20 mA enthalpy sensors and digital inputs. (For more information on note 2, ...
Page 42 - solid state humidity sensor. (For more information on
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 42 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.) Fig. 35. W7750C Controller with 4-to-20 mA heating, cooling and economizer wiring diagram. AOs must...
Page 43 - Bus Termination Module; Bus segment; RP7517B PNEUMATIC TRANSDUCER
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 43 74-2958—1 Fig. 36. Pneumatic transducer to W7750B,C (B shown, see triangle note 4). To use the analog outputs on the W7750C with 2-to-10V actuators or transducers, a 500 ohm (1 percent or better tolerance) resistor must be placed across the 2-to-...
Page 44 - ® Bus segment termination module wiring diagram.
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 44 Fig. 38. Typical doubly terminated daisy-chain L ON W ORKS ® Bus segment termination module wiring diagram. M10519A PART NO. 209541BTERMINATIONMODULE PART NO. 209541BTERMINATIONMODULE W7750B, C 14 15 14 15 W7750B, C 14 15 W7750B, C BROW...
Page 45 - ® Bus termination wiring options.; Step 5. Order Equipment; O I II
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 45 74-2958—1 Fig. 39. L ON W ORKS ® Bus termination wiring options. Step 5. Order Equipment After compiling a bill of materials through completion of the previous application steps, refer to Table 11 for ordering information. Contact Honeywell for i...
Page 48 - Part Number
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 48 Step 6. Configure Controllers Excel E-Vision PC Software is used to configure W7750 Controllers to match their intended application. The E-Vision User Guide, form number 74-2588 provides details for operating the PC software. W7750 Cont...
Page 49 - Alarms; Name of alarm or error bit
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 49 74-2958—1 1. Check the version numbers of the controller firmware, E-Vision and the E-Vision script. 2. Check the wiring to the power supply and make sure there is a good earth ground to the controller. 3. Check the occupancy and HVAC modes. 4. C...
Page 50 - Broadcasting the Service Message; W7750 Controller Status LED
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 50 NOTE: The node can be reset by switching the node to MANUAL and then to the normal operating mode (see Fan Operation in Appendix B). Also, the Excel 10 variables, AlarmLogX where X is 1 through 5, that store the last five alarms to occu...
Page 51 - pushbutton locations.; APPENDICES; Sensor Calibration
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 51 74-2958—1 Fig. 42. LED location on W7750. T7770C,D Wall Module Bypass Pushbutton and Override LED Pressing the bypass pushbutton, located on the T7770C,D Wall Modules in Fig. 43, causes the override LED to display the Manual Override mode of the ...
Page 52 - — The Proportional Gain (also called Throttling Range)
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 52 Occasionally, the PID parameters require tuning to optimize comfort and smooth equipment operation. This applies to the W7750A,B,C Controllers. CVAHU Controllers are configured by E-Vision with default values of PID parameters as shown ...
Page 53 - Common Operations
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 53 74-2958—1 Common Operations The Excel 10 W7750 Controller applications have many common operations that are applicable regardless of the type of heating, cooling, or economizer equipment configuration. These operations are available to the W7750A...
Page 55 - If the pushbutton is
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 55 74-2958—1 than Intermittent Fan (see Fan Operation in this Appendix), and the mode is Occupied when the RmTemp value becomes invalid, the fan continues to run. REMOTE SETPOINT (RmtStptPot) This is the Setpoint Potentiometer contained in the T7770...
Page 56 - Bus device, so that no physical; The three sources of manual override status are:
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 56 Fig. 45. LED and Bypass pushbutton operation. STANDBY MODE (StatusOcySen) The digital input for an occupancy sensor (usually a motion detector or possibly a time clock) provides the controller with a means to enter an energy-saving Stan...
Page 57 - Bus to the other W7750 controllers. If the; Bus even if the time clock input is configured.; SETPOINT RAMPING
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 57 74-2958—1 DestBypass - Has possible states: Bypass On, Bypass Off or Not Assigned (not active). This input places the controller in an untimed bypass state or turns off the bypass mode. This source is second in priority to DestManOcc under the sa...
Page 59 - DIRTY FILTER MONITOR; Temperature Control Operations; See Fig. 49 for a diagram of a typical W7750 Unit.
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 59 74-2958—1 DIRTY FILTER MONITOR The air filter in the air handler can be monitored by the W7750 and an alarm issued when the filter media needs replacement. The two methods of monitoring the filter are: 1. A differential pressure switch whose cont...
Page 60 - STAGED COOLING CONTROL
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 60 STAGED COOLING CONTROL The Excel 10 W7750 Controller supports up to four stages of D/X cooling. As space temperature rises above the current Cooling Setpoint, the controllers mode of operation is switched to the COOL mode. When in the C...
Page 61 - CASCADE CONTROL OF MODULATING COOLING/HEATING; C) hysteresis with the lock-out control to prevent short; ECONOMIZER DAMPER CONTROL
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 61 74-2958—1 cooling control algorithm compares the current space temperature to the EffectiveHeatSetPt, and calculates a PID error signal. This error signal causes the heating stage outputs to be cycled, as required, to drive the space temperature ...
Page 63 - User Address Indexes (all in alphabetical order); Page
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 63 74-2958—1 User Address Indexes (all in alphabetical order) Table 20. Input Output Points.Address Page CO2Sensr 71CORMode 67DaTempSensr 70EconEnSw 72FltrPressSensr 70FltrPressSensr 70IaqOvrSw 72Model 72ModelSw 73MonitorSensr 71MonitorSw 73OaEnthSe...
Page 64 - Address; Mappable User Addresses and Table Number
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 64 StatusEconEn 85StatusEconOut 86StatusError 90StatusFilter 87StatusIaqOvr 87StatusManOcc 85StatusMode 84StatusOcc 84StatusOcySen 85StatusOvrd 84StatusSched 84StatusSmoke 87StatusWndw 87TimeClckOcc 84WSHPEnable 88 Table 24. Calibration Po...
Page 65 - Failure Detect User Addresses and Table Number
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 65 74-2958—1 DiffEconEnTemp 21DisMinHtTime 25DisMinClTime 25DlcBumpTemp 21EconIAQPos 21EconMinPos 21EconMtrSpd 25EconPos 23EconMode 25FanFailTime 25FanMode 25FanOnHtMode 25FanRunOnCool 25FanRunOnHeat 25FilterPress 23FltrPressStPt 21Free1Stat 23Free2...
Page 106 - Map
EXCEL 1 0 W77 5 0 A ,B ,C CO NST A NT V O L U ME AHU CO NTRO L L ER 74-2958 —1 106 Table 27. Direct Access And Special Points. User Address NvName Field Name Engineering Units: English (Metric) or States plus Range D igi tal Sta te o r Val ue of S tat e Default E -Vi sion (M, P, S) Share Map Direct ...
Page 107 - re
EXCEL 1 0 W77 5 0 A ,B ,C CO NST A NT V O L U M E AHU CO NTRO L L ER 107 74-2958 —1 TestHtClStg1 nviManValue HeatCoolStage1 OFFON 01 OFF X During MANUAL mode, HeatCoolStage1 parameters turn the corresponding heat, or cool stage to on (1) or off (0). When HeatCoolMode is 0, then cooling loads are con...
Page 109 - Approximate Memory Size Estimating Procedure.
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 109 74-2958—1 Appendix D. Q7750A Excel 10 Zone Manager Point Estimating Guide. Memory size approximation is shown below: (all sizes in bytes) When memory size is less than 110,000 bytes, the size is OK. When memory size is between 110,000 and 128,00...
Page 110 - Table 29. Sensor Resistance Versus Temperature.; SENSOR RESISTANCE VERSUS TEMPERATURE; SENSOR RESISTANCE VERSUS TEMPERATURE
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 110 Appendix E. Sensor Data for Calibration. Resistance Sensors. Sensor Type:C7100A, (and C7170A) Sensor Use:Discharge air, Outdoor air Table 29 lists the points for Sensor Resistance versus Temperature. Fig. 52 shows the graph of these po...
Page 112 - SENSOR VOLTAGE VERSUS HUMIDITY PERCENTAGE
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 112 Fig. 56. Graph of Sensor Resistance versus Temperature. Voltage/Current Sensors. Sensor Type:C7600B1000 2 to 10V (Decorative Wall Mount) Sensor Use:Humidity Table 34 lists the points for Sensor Voltage versus Humidity. Fig. 57 shows th...
Page 113 - Sensor Current
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 113 74-2958—1 Table 36 lists the points for Sensor Current versus Enthalpy (volts). Fig. 59 shows the graph of these points. Table 36. Sensor Current Versus Enthalpy (volts). Fig. 59. Graph of Sensor Current versus Enthalpy (volts). See Fig. 60 for ...
Page 114 - Fig. 61. C7400A Solid State Enthalpy Sensor output
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 74-2958—1 114 Fig. 60. Partial psychometric chart for a C7400A Solid State Enthalpy Sensor. See Fig. 61 for a C7400A Solid State Enthalpy Sensor output current vs. relative humidity. Fig. 61. C7400A Solid State Enthalpy Sensor output current vs. rel...
Page 115 - SENSOR VOLTAGE VERSUS CO2 CONCENTRATION; SENSOR VOLTAGE VERSUS INPUT VOLTAGE TO A/D
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER 115 74-2958—1 Sensor Use:CO 2 concentration Table 37 lists the points for Sensor Voltage versus CO 2 concentration. Fig. 62 shows the graph of these points. Table 37. Sensor Voltage Versus CO 2 Concentration. Fig. 62. Graph of Sensor Voltage versus ...
Page 116 - SENSOR VOLTAGE VERSUS PRESSURE
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