Honeywell W7750A specifications W7750 Controllers

Page 36

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

Table 9. Field Wiring Reference Table (Honeywell listed as AK#### or equivalent).

 

 

 

 

 

 

 

Recommended

 

Specification

 

 

Wire

Minimum Wire

 

or

 

Maximum Length ft.

Function

Size AWG (mm2)

Construction

Requirement

Vendor Wire Type

(m)

LONWORKS

22 AWG

Twisted pair solid

Level IV

Honeywell

Refer to LONWORKS Bus

Bus

(0.34 mm2)

conductor, nonshielded

140°F (60°C)

AK3791 (one twisted pair)

Wiring Guidelines for

(Plenum)

 

or Echelon approved

rating

AK3792 (two twisted pairs)

maximum length

 

 

cable.

 

 

 

 

 

 

 

 

 

LONWORKS

22 AWG

Twisted pair solid

Level IV

Honeywell

Refer to LONWORKS Bus

Bus (Non-

(0.34 mm2)

conductor, nonshielded

140°F (60°C)

AK3781 (one twisted pair)

Wiring Guidelines for

Plenum)

 

or Echelon approved

rating

AK3782 (two twisted pairs)

maximum length

 

 

cable.

 

 

 

 

 

 

 

 

 

Input

18 to 22 AWG

Multiconductor (usually

140°F (60°C)

Standard thermostat wire

1000 ft. (305m) for 18

Wiring

(1.0 to 0.34 mm2)

five-wire cable bundle).

rating

 

AWG 200 ft. (61m) for 22

Sensors

 

For runs >200 ft. (61m)

 

 

AWG

Contacts

 

in noisy EMI areas, use

 

 

 

 

 

shielded cable.

 

 

 

 

 

 

 

 

 

Output

14 AWG (2.0 mm2)

Any pair nonshielded

NEC Class 2

Honeywell

Limited by line-loss

Wiring

18 AWG (1.0 mm2)

(use heavier wire for

140°F (60°C)

AK3702 (18 AWG)

effects on power

Actuators

acceptable for

longer runs).

rating

AK3712 (16 AWG)

consumption. (See Line

Relays

short runs)

 

 

AK3754 (14 AWG)

Loss subsection.)

 

 

 

 

 

 

Power

14 AWG (2.0 mm2)

Any pair nonshielded

NEC Class 2

Honeywell

Limited by line-loss

Wiring

 

(use heavier wire for

140°F (60°C)

AK3754 (14 AWG) twisted

effects on power

 

 

longer runs).

rating

pair AK3909 (14 AWG)

consumption. (See Line

 

 

 

 

single conductor

Loss subsection.)

 

 

 

 

 

 

W7750 Controllers

Fig. 27 through 35 illustrate W7750A,B,C Controller wiring for various configurations. Connections to the wall module terminals (2 through 6) and the communications terminals (14 and 15) are made at terminal blocks. Connection for access to the LONWORKS Bus is provided by plugging the connector into the communications jack.

1.STRIP 1/2 IN. (13 MM)

1/2

FROM WIRES TO

BE ATTACHED AT

(13)

 

ONE TERMINAL.

2.TWIST WIRES TOGETHER WITH PLIERS (A MINIMUM

OF THREE TURNS).

Q38

U3

J2

JUMPER

2

1 TERMINAL 24

3. CUT TWISTED END OF WIRES TO 3/16 IN. (5 MM)

BEFORE INSERTING INTO TERMINAL AND

 

TIGHTENING SCREW. THEN PULL ON EACH

WIRE IN ALL TERMINALS TO CHECK FOR

 

GOOD MECHANICAL CONNECTION.

M17207

 

Fig. 25. Attaching two or more wires at terminal blocks.

The W7750B provides a jumper to select High-Side or Low- Side switching of the digital outputs. Fig. 26 shows the W7750B High-Side/Low-Side selectable switching. (See wiring diagrams, Figs. 30 through 34.)

1J2 IS LOCATED NEAR TERMINAL 24 (COVER REMOVED).

2W7750B IS FACTORY-DELIVERED WITH JUMPER ON HIGH-SIDE

(PINS CLOSEST TO TERMINAL BLOCK). LOW-SIDE PINS ARE TWO

PINS CLOSEST TO Q38.

M16418A

Fig. 26. W7750B High-Side/Low-Side selectable switching

and jumper location.

NOTE: If an Excel 10 W7750A,B,C Controller or Zone Manager is not connected to a good earth ground, the controller internal transient protection circuitry is compromised and the function of protecting the controller from noise and power line spikes cannot be fulfilled. This can result in a damaged circuit board and require replacing the controller.

See Table 10 for a description of the W7750A terminals.

74-2958— 1

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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 ProvidedProducts Covered Organization of ManualApplicable Literature 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 Wall Modules Duct SensorT7770A1006 T7770CT7560A,B construction in in. mm Configurations GeneralConfiguration Options Summary For W7750A,B,C Controllers Allowable Heating and Cooling Equipment Configurations Staged HEATING/COOLING ControlHeat Pump Control Modulating HEATING/COOLING ControlEconomizer Control Pneumatic Actuator ControlOccupancy Sensor Window Open/Closed Digital InputWall Module Options MIXED-OUTPUT-TYPE ControlModes of Operation Dirty Filter MonitorIndoor Air Quality IAQ Override Smoke ControlOFF Mode DisabledNot AssignedOverview Plan the SystemDetermine Other Bus Devices Required Step No DescriptionLay Out Communications and Power Wiring Lonworks Bus LayoutExcel VAV Cvahu Power Wiring Power Budget Calculation ExampleDeviceVA Information Obtained from VA Ratings For Transformer Sizing Device Description ML6161A/B Damper Actuator, 35 lb-in R8242A ContactorML7984B PWM Valve Actuator 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 Configure Controllers TroubleshootingTroubleshooting Excel 10 Controllers and Wall Modules CablingAlarms Excel 10 AlarmsResistance Value ohms Broadcasting the Service Message W7750 Controller Status LEDAppendix A. Using E-Vision to Commission a W7750 Controller Setting the Pid ParametersT7770C,D Wall Module Bypass Pushbutton and Override LED Sensor CalibrationAppendix B. Sequences of Operation Common Operations Room Temperature Sensor RmTemp HeatingEconomizer IAQ OptionBypass Mode StatusOvrd and StatusLed Remote Setpoint RmtStptPotSetpoint Limits LoSetptLim and HiSetptLim BypassTimeContinuous Unoccupied Mode Occupancy Mode and Manual Override ArbitrationNot Assigned Bypass OccupiedRecovery Ramping for Heat Pump Systems Time Clock OccTimeClockSchedule Master SchedMaster Setpoint RampingWindow Sensor StatusWndw Smoke ControlFAN Operation Demand Limit Control DLCTemperature Control Operations See for a diagram of a typical W7750 UnitDirty Filter Monitor Staged Cooling Control ONE StageTWO Stages Three StagesCascade Control of Modulating COOLING/HEATING Series 60 Modulating ControlPulse Width Modulating PWM Control Outdoor AIR Lockout of HEATING/COOLINGEconomizer ENABLE/DISABLE Control Indoor AIR Quality IAQ OverrideFreeze Stat Discharge AIR LOW Limit ControlInput Output Points Address Control Parameters AddressEnergy Management Points Address Status Points AddressMappable User Addresses and Table Number Relative Temperature Air FlowCO2 Concentration EnthalpyApplication reset therefore, these points can Placed in manual mode through a menuValid states and the corresponding Enumerated values are shownDefault Input/Output PointsNvName Field Name CommentsNciIoSelect DigitalIn1 Occsensor Shcedmasterin255 NciIoSelect DigitalIn2 Occsensor UnuseddiCOOLSTAGE1 COOLSTAGE2COOLSTAGE3 COOLSTAGE4Sixtyfifty SiinvalidPPM Siinvalid FalseTrue EconEnSw NvoIO EconEnableIn Position when poor indoor air quality is detectedStatusDI3 NvoIO UbDigitalIn OccSensr NvoIODefault Comments NvNameControl Parameters OdEnthalpyEnable MaxClRamp NciAux1SetPt UbMaxClRampS0 Degrees F/HrMinClRamp NciAux1SetPt UbMinClRampS0 Degrees F/Hr MaxClRamp, OdTempMaxClRamp,PPM Discharge air temperature cascade control loop GainCoolProp NciAux2SetPt UbKpCoolS2 Degrees F Degrees CGain for the cooling control loop GainHeatProp NciAux2SetPt UbKpHeatS2 Degrees F Degrees CEnergy Management Points Refer to WSHPEnable.value NviFree1 ValueAuxiliary functions. nviFree1 controls the FREE1OUT Network variable input failsNviTimeClk Value DestTimeClk NviTimeClk StateRefer to nviTimeClk.value 255 SrcTimeClkCt NvoTimeClk ValueStatus Points Alarmbit1 Bit Offset = SensorFailAlrmBit Offset = FrostProtectAlrm Bit Offset = InvalidSetPtAlrmNoalarm NodedisabledSmokealarm UpdateallfieldsDisabledmode StartupwaitHeat CoolStatusEconEn NvoData1 EconEnable Air flow switch is configuredNciAux1SetPts.ubOdEnthalpyEnableS2 StatusManOcc NvoData1 NetManOccHeatStgsOn NvoData1 HeatStagesOn Auxiliary heating stages are turned onCoolStgsOn NvoData1 CoolStagesOn For both heating or coolingIs 1, the algorithm controls as per the settings found NciConfig.SmokeControlController mode is switched to Freezeprotect MonitorSw NvoData1 MonSwitchBypasstimerfield TempcontrolptfieldSpacetempfield DischargetempfieldUbinvalid StatusError NvoError Errorbit0 SpaceTempErrorNvoError Errorbit0 Bit Offset = Temperature SetPtError NvoError Errorbit0NvoError Errorbit1 Bit Offset = RtnEnthalpyError NvoError Errorbit1Are disabled as if the sensor was not configured Bit Offset = SpaceCO2Error NvoError Errorbit1Bit Offset = NvWindowError NvoError Errorbit2 Bit Offset = NvDlcShedError NvoError Errorbit2Bit Offset = NvTodEventError NvoError Errorbit3 Bit Offset = NvByPassError NvoError Errorbit3Cfglocal CfgexternalCfgnul Calibration PointsConfiguration Parameters False True DisMinHtTime NciConfig DisableHeatMinTime DisMinClTime NciConfig DisableCoolMinTimeCascCntrl NciConfig CascadeControl UseRaTempCtl NciConfigLast NET Offset AbsolutemiddleNone Normal BypassonlyLonmark /Open System Points Hvacauto HvacheatHvacmrngwrmup Hvacprecool Hvaccool Hvacnightpurge Hvacnul Hvacoff74-2958 100 DestRmTemp NviSpaceTemp Degrees FSNVTtempp 14 to SrcRmTemp NvoSpaceTemp Degrees FHvacauto Hvacnul HvacmrngwrmupHvactest Alarmnotifydisabled NvoStatus Electricalfault 103 NvoStatus Inalarm255 Not configured 74-2958 NvoStatus UnabletomeasureSwon On other nodes. If the economizer function is configured by Corresponding economizer function is not enabled becauseSrcEconEnable NvoEcon State SrcEconEnCt NvoEcon ValueDirect Access And Special Points OFF Data Share Points Approximate Memory Size Estimating Procedure =using One-to-Many and not using points= including mapped points and others for Mapped points = number of mapped points per ExcelSensor Resistance Versus Temperature Resistance Ohms Resistance SensorsSensor Type Sensor UseOffset Setpoint Temperature Direct Setpoint TemperatureT7770B,C 10K ohm setpoint potentiometer Relative 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 Sensor Voltage Vdc Versus Pressure Inw Pressure Inw kPa Sensor Voltage VdcInw 50.0.13