Honeywell W7750A specifications Description of Devices, Typical system overview

Page 6

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

INTRODUCTION

LONWORKSnetwork (LONWORKS Bus) for communications, and conforms with the LONMARK HVAC Interoperability standard for Roof Top Unit Controllers (see Fig. 9).

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 LONMARKcompliant device designed to control single zone and heat pump air handlers. W7750 systems control the space temperature in a given zone by regulating the heating and cooling equipment in the air handler that delivers air to that space. The W7750 air handler is typically an all-in-one constant air volume packaged unit, located on the roof of the building. In addition to standard heating and cooling control, the W7750 provides many options and advanced system features that allow state-of-the-art commercial building control. The W7750 Controller is capable of stand-alone operation; however, optimum functional benefits are achieved when the network communication capabilities are used. The W7750 utilizes the Echelon

The T7770 or T7560 direct-wired Wall Modules are used in conjunction with W7750 Controllers. The zone controlled by the W7750 Controller typically can use a T7770A through D or a T7560A,B Wall Module. Additional features available in T7770A through D models include analog setpoint input knob, override digital input pushbutton, override status LED and LONWORKS Bus network access jack. Additional features available in T7560A,B models include analog setpoint input knob, override digital input pushbutton, humidity sensor (T7650B model), override status LCD and digital display.

The Q7750A Excel 10 Zone Manager is a communications interface that allows devices on the LONWORKS Bus network to communicate with devices on the standard EXCEL 5000System C-Bus. Fig. 1 shows an overview of a typical system layout. The Q7750A also provides some control and monitoring functions.

Q7752A

 

 

 

 

 

 

 

 

 

 

C-BUS COMMUNICATION NETWORK

 

LONWORKS BUS

 

 

 

 

 

 

 

 

 

 

 

SERIAL

 

 

 

 

 

 

 

 

 

 

 

 

ADAPTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXCEL 10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q7750A

 

 

PERSONAL COMPUTER TOOLS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ZONE

 

EXCEL 500

E-VISION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MANAGER

EXCEL BUILDING SUPERVISOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CARE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C-BUS TO LONWORKS BUS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERFACE DEVICE

Q7740A

LONWORKS-BUS COMMUNICATIONS NETWORK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-WAY

 

 

 

 

 

 

 

 

 

 

 

 

LONWORKS BUS COMMUNICATIONS NETWORK

REPEATER

31

30

29

28

27

26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

24

23

22

21

20

19

 

 

 

 

 

 

 

 

 

 

 

 

 

18

17

16

 

 

 

EXCEL 10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXCEL 10 W7751F

 

W7750B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CVAHU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PANEL PLENUM

 

CONTROLLER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOUNT VERSION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VARIABLE AIR VOLUME

Q7751A

1

 

 

 

 

 

 

 

 

10

11

12

13

14

15

CONTROLLER

 

2

3

4

5

6

 

 

 

 

 

 

 

 

 

 

 

 

7

8

9

 

 

 

 

 

 

 

FTT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LONWORKS BUS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ROUTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXCEL 10 T7770

 

 

 

 

 

 

 

 

EXCEL 10 T7560A, B

 

WALL MODULE

 

 

 

 

 

 

 

 

WALL MODULE

M17487

Fig. 1. Typical system overview.

74-2958— 1

6

Image 6
Contents Excel General Considerations W7750 Controllers Appendices72-2958 List of Figures 74-2958Setpoint ramping parameters with ramp rate calculation 74-2958List of Tables Description of Devices Typical system overviewControl Application Control ProvidedApplicable Literature Products CoveredOrganization of Manual Form No TitleProduct Names Agency ListingsAbbreviations and Definitions Construction ControllersW7750A DI-1Performance Specifications PowerSpecial Note for the W7750B,C Unit Specified Space Temperature Sensing Range CPUMemory Capacity Excel 10 W7750C Constant Volume AHU Controller Jack DIN rail adapters Lonmark Functional ProfileInputs/Outputs Analog InputsDigital Inputs Triac Outputs on the W7750B,C Models onlyDigital Outputs T7770A1006 Wall ModulesDuct Sensor T7770CT7560A,B construction in in. mm Configurations GeneralConfiguration Options Summary For W7750A,B,C Controllers Heat Pump Control Allowable Heating and Cooling Equipment ConfigurationsStaged HEATING/COOLING Control Modulating HEATING/COOLING ControlEconomizer Control Pneumatic Actuator ControlWall Module Options Occupancy SensorWindow Open/Closed Digital Input MIXED-OUTPUT-TYPE ControlIndoor Air Quality IAQ Override Modes of OperationDirty Filter Monitor Smoke ControlNot OFF ModeDisabled AssignedDetermine Other Bus Devices Required OverviewPlan the System Step No DescriptionLay Out Communications and Power Wiring Lonworks Bus LayoutExcel VAV Cvahu Power Wiring Power Budget Calculation ExampleDeviceVA Information Obtained from ML7984B PWM Valve Actuator VA Ratings For Transformer Sizing Device DescriptionML6161A/B Damper Actuator, 35 lb-in R8242A Contactor Line LossPower wiring details for one Excel 10 per Transformer Nema class 2 transformer voltage output limitsPrepare Wiring Diagrams General ConsiderationsW7750 Controllers Factory Default Digital Outputs Terminal Terminal Number DescriptionConstant Volume AHU Controller ML6161 Floating Actuator COM CCW Load Controller Power Heat Wall Economizer Damper PWM Actuator Power Signal W7750C Constant Lonworks Bus Termination Module Pneumatic transducer to W7750B,C Shown, see triangle noteBrown Orange Lonworks Bus termination wiring options Order EquipmentT7770 and T7560 Wall Modules Honeywell Logo T7770D1018Sensor with Bypass/LED and Lonworks Jack Accessories Sensors AccessoriesEchelon Based Components and Parts Troubleshooting Excel 10 Controllers and Wall Modules Configure ControllersTroubleshooting CablingAlarms Excel 10 AlarmsResistance Value ohms Broadcasting the Service Message W7750 Controller Status LEDT7770C,D Wall Module Bypass Pushbutton and Override LED Appendix A. Using E-Vision to Commission a W7750 ControllerSetting the Pid Parameters Sensor CalibrationAppendix B. Sequences of Operation Common Operations Economizer Room Temperature Sensor RmTempHeating IAQ OptionSetpoint Limits LoSetptLim and HiSetptLim Bypass Mode StatusOvrd and StatusLedRemote Setpoint RmtStptPot BypassTimeNot Assigned Continuous Unoccupied ModeOccupancy Mode and Manual Override Arbitration Bypass OccupiedSchedule Master SchedMaster Recovery Ramping for Heat Pump SystemsTime Clock OccTimeClock Setpoint RampingFAN Operation Window Sensor StatusWndwSmoke Control Demand Limit Control DLCTemperature Control Operations See for a diagram of a typical W7750 UnitDirty Filter Monitor TWO Stages Staged Cooling ControlONE Stage Three StagesPulse Width Modulating PWM Control Cascade Control of Modulating COOLING/HEATINGSeries 60 Modulating Control Outdoor AIR Lockout of HEATING/COOLINGFreeze Stat Economizer ENABLE/DISABLE ControlIndoor AIR Quality IAQ Override Discharge AIR LOW Limit ControlEnergy Management Points Address Input Output Points AddressControl Parameters Address Status Points AddressMappable User Addresses and Table Number CO2 Concentration Relative TemperatureAir Flow EnthalpyValid states and the corresponding Application reset therefore, these points canPlaced in manual mode through a menu Enumerated values are shownNvName Field Name DefaultInput/Output Points Comments255 NciIoSelect DigitalIn2 NciIoSelect DigitalIn1Occsensor Shcedmasterin Occsensor UnuseddiCOOLSTAGE3 COOLSTAGE1COOLSTAGE2 COOLSTAGE4Sixtyfifty SiinvalidPPM Siinvalid FalseTrue StatusDI3 NvoIO UbDigitalIn EconEnSw NvoIO EconEnableInPosition when poor indoor air quality is detected OccSensr NvoIODefault Comments NvNameControl Parameters MinClRamp NciAux1SetPt UbMinClRampS0 Degrees F/Hr OdEnthalpyEnableMaxClRamp NciAux1SetPt UbMaxClRampS0 Degrees F/Hr MaxClRamp, OdTempMaxClRamp,PPM Gain for the cooling control loop Discharge air temperature cascade control loopGainCoolProp NciAux2SetPt UbKpCoolS2 Degrees F Degrees C GainHeatProp NciAux2SetPt UbKpHeatS2 Degrees F Degrees CEnergy Management Points Auxiliary functions. nviFree1 controls the FREE1OUT Refer to WSHPEnable.valueNviFree1 Value Network variable input failsRefer to nviTimeClk.value NviTimeClk ValueDestTimeClk NviTimeClk State 255 SrcTimeClkCt NvoTimeClk ValueStatus Points Bit Offset = FrostProtectAlrm Alarmbit1Bit Offset = SensorFailAlrm Bit Offset = InvalidSetPtAlrmSmokealarm NoalarmNodedisabled UpdateallfieldsHeat DisabledmodeStartupwait CoolNciAux1SetPts.ubOdEnthalpyEnableS2 StatusEconEn NvoData1 EconEnableAir flow switch is configured StatusManOcc NvoData1 NetManOccCoolStgsOn NvoData1 CoolStagesOn HeatStgsOn NvoData1 HeatStagesOnAuxiliary heating stages are turned on For both heating or coolingController mode is switched to Freezeprotect Is 1, the algorithm controls as per the settings foundNciConfig.SmokeControl MonitorSw NvoData1 MonSwitchSpacetempfield BypasstimerfieldTempcontrolptfield DischargetempfieldUbinvalid NvoError Errorbit0 StatusError NvoError Errorbit0SpaceTempError Bit Offset = Temperature SetPtError NvoError Errorbit0Are disabled as if the sensor was not configured NvoError Errorbit1Bit Offset = RtnEnthalpyError NvoError Errorbit1 Bit Offset = SpaceCO2Error NvoError Errorbit1Bit Offset = NvTodEventError NvoError Errorbit3 Bit Offset = NvWindowError NvoError Errorbit2Bit Offset = NvDlcShedError NvoError Errorbit2 Bit Offset = NvByPassError NvoError Errorbit3Cfgnul CfglocalCfgexternal Calibration PointsConfiguration Parameters False True CascCntrl NciConfig CascadeControl DisMinHtTime NciConfig DisableHeatMinTimeDisMinClTime NciConfig DisableCoolMinTime UseRaTempCtl NciConfigNone Normal Last NETOffset Absolutemiddle BypassonlyLonmark /Open System Points Hvacmrngwrmup Hvacprecool Hvaccool Hvacnightpurge Hvacnul HvacautoHvacheat HvacoffSNVTtempp 14 to 74-2958 100DestRmTemp NviSpaceTemp Degrees F SrcRmTemp NvoSpaceTemp Degrees FHvacauto Hvacnul HvacmrngwrmupHvactest Alarmnotifydisabled 255 Not configured 74-2958 NvoStatus Electricalfault103 NvoStatus Inalarm NvoStatus UnabletomeasureSwon SrcEconEnable NvoEcon State On other nodes. If the economizer function is configured byCorresponding economizer function is not enabled because SrcEconEnCt NvoEcon ValueDirect Access And Special Points OFF Data Share Points = including mapped points and others for Approximate Memory Size Estimating Procedure=using One-to-Many and not using points Mapped points = number of mapped points per ExcelSensor Type Sensor Resistance Versus Temperature Resistance OhmsResistance Sensors Sensor UseT7770B,C 10K ohm setpoint potentiometer Relative Offset Setpoint TemperatureDirect Setpoint Temperature Above and Below Setpoint Resistance OhmsVoltage/Current Sensors Sensor Voltage Versus Humidity Humidity PercentageSensor Voltage Versus Humidity Relative Humidity Percentage Sensor Current Versus Enthalpy volts Enthalpy mA 113 74-2958T7242 or equivalent 74-2958 114MAmAmAmA AmA mA mA Sensor Voltage Versus Input Voltage To A/D Voltage to A/D Inw Sensor Voltage Vdc Versus Pressure InwPressure Inw kPa Sensor Voltage Vdc 50.0.13