Honeywell W7752D Byte Ntcnonlinearize, Ntcnonlinearized, Byte Fiveposition, Noswitch

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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

nciCntrlSettings

nciCntrlSettings

nciCntrlSettings

nciEnergyManag

nciEnergyManag

nciEnergyManag

nciFcuConfig

nciFcuConfig

field name

reheat_hysteresis

fan_min_on_time

fan_min_off_time

si_dlc_setpt_bump

si_optstart_grad[0]

si_optstart_grad[1]

room_temp_sensor

fan_speed_switch

Table C2. Configuration Variables for Excel 10 FCU Controllers

engineering units:

digital

 

 

state

default

comments

English (metric) or states

or

plus range

 

 

value

 

 

 

 

 

SNVT_lev_percent

 

5%

This configuration variable specifies the hysteresis between switching

0 to 100%

 

 

the reheat output ON and OFF.

 

 

 

 

SNVT_time_sec

 

0

This configuration variable specifies the minimum time the fan has to

0 to 1200 seconds

 

 

run when commanded ON by the control algorithm. This time will be

 

 

 

ignored in case of smoke purge. The min_on_time starts as soon as

 

 

 

the fan is switched on.

SNVT_time_sec

 

0

This configuration variable specifies the minimum time the fan has to

0 to 1200 seconds

 

 

remain OFF when commanded OFF by the control algorithm. This time

 

 

 

will be ignored in case of smoke purge. The min_on_time starts as

 

 

 

soon as the fan is switched OFF.

 

 

 

 

SNVT_temp_p

 

3.6 DDF (2 K)

This configuration variable is used to shift the temperature setpoint

0 to 18 DDF (0 to 10 K)

 

 

during demand limit control load shedding. When nviDlcShed is

 

 

 

different from zero, the current occupancy setpoint will be decreased

 

 

 

by this value for heating and increased for cooling.

 

 

 

 

SNVT_temp_p

 

0 DDF/hr (0 K/hr)

This configuration variable specifies the cooling gradient used by the

-36 to 0 DDF/hr (-20 to 0

 

 

optimum start function to calculate the optimum time for starting to

K/hr)

 

 

decrease the effective setpoint smoothly from the unoccupied or

 

 

 

standby cooling setpoint to the occupied cooling setpoint.

 

 

 

 

SNVT_temp_p

 

0 DDF/hr (0 K/hr)

This configuration variable specifies the heating gradient used to

0 to 36 DDF/hr (0 to 20 K/hr)

 

 

determine the optimum time to start increasing the current effective

 

 

 

setpoint smoothly to the occupied setpoint at the beginning of

 

 

 

scheduled occupancy.

BYTE

 

NTC_NON_LINEARIZE

This configuration variable specifies whether a direct wired room

NO_TEMP_SENSOR

0

D

temperature sensor is connected to the node or a room temperature

NTC_NON_LINEARIZED

2

 

value from the network is used.

 

 

 

 

BYTE

 

FIVE_POSITION

This configuration variable specifies the type of fan speed switch on

NO_SWITCH

0

 

the wall module.

THREE_POSITION

1

 

 

FOUR_POSITION

2

 

 

FIVE_POSITION

3

 

 

 

 

 

 

EN2B-0285GE51 R0909

40

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Contents Excel Appendix a Using An LNS tool to Commission a Fan Coil Unit Appendix B Configuring for Master/Slave OperationAppendix C LON Interface Revision History Description of Devices Typical system overviewApplicable Literature Products CoveredOrganization of Manual Product NamesControl Application Control ProvidedSetpoint Limits SetpointsSetpoint Knob Setpoint from NetworkZEB Energy-Saving Features BypassOccupancy Status Safety Features Operating ModesExcel 10 W7754 FCU Controllers ConstructionExcel 10 W7752 FCU Controllers Electrical Shock Hazard180 Controller Performance Specifications Configurations GeneralFan Type Type of Heating and Cooling Equipment Reheat Output Digital InputCommon Temperature Control Master/Slave Controllers Excel 10 Wall Module OptionsAbbreviations and Definitions Determine Other Bus Devices Required OverviewPlan the System Step No DescriptionLay Out Communications and Power Wiring Lonworks LayoutPrepare Wiring Diagrams Power WiringGeneral Considerations Vendor wire type WiringPower PlenumLOW 230 ONW Orks Termination XAL-TermExcel 10 Sensors Order EquipmentExcel 10 Wall Modules Echelon-Based Components and PartsConfigure Controllers Using Plug-InsOutput Input Equipment Control FanSwitching Levels Zone OptionsMiscellaneous Alarms TroubleshootingTroubleshooting Excel 10 FCU Controllers and Wall Modules CommissioningFCU Alarms ReturntonormalBroadcasting the Service Message Manual ModeTemperature Sensor Calibration ProcedureZone Control Options Output Configuration OptionsInput Configuration Options Network Variable BindingAppendix C LON Interface Page NV name Continuous Automode To 100% For the reheat output EN2B-0285GE51 R0909 Ntcnonlinearized NoswitchByte Ntcnonlinearize Byte FivepositionDioccupiedsensor Byte DinotusedDiwindowclosed DiairflowTwostage Byte FloatingOnestage ThreestageByte Reheat FreeuseRelnotused Fourpipe TwopipeUword Bypassunoccupie OffsetAbsolutemiddle NobuttonTable C3. Input Variables for Excel 10 FCU Controllers Suppressalarms Modeenable UnsuppressalarmsModedisable OcnulRqnormal Rqupdatestatus Rqupdatealarm Rqreportmask OFF NULInvalid ON1OFF2 Byte NormalhcmodeOFF1OFF2 OFF1ON2Byte Normalfanmode Ledoff LedonNowindow ClosedOpen Table C4. Output Variables for Excel 10 FCU Controllers Rtncomfailsetptoffs RtncomfailtempresetAlarmnotifydisabled RtncomfailschedoccAlmcomfailmanheat Almcomfailmancool Almhwswmismatch OFF NotassignedOcbypass Ocstandby Fieldhwoverride OFF Nofanspeedsw UbyteFieldeffectocc FieldschedoccOcunoccupied Ocbypass Ocstandby CtlfanswitchoffCtldisabled Ocunoccupied Ocbypass Ocstandby OcnulFanruns Not Actice ActiveFanoffafteroncmd ExternalnotacticeStoff StonInvalid Uword Pressed OFF NoreheatNotpressed Contactopen Contactclosed UwordStlow Stmed Sthigh Invalid Byte InitialNoalarm EnabledDisabled InalarmAlarm Suppressalarms Alarmnotifydisabled Open NowindowBugver Nodetype Table C5. Unused Variables for Excel 10 FCU Controllers WordAutomation and Control Solutions

W7752D specifications

The Honeywell W7752D is a versatile and advanced electronic gas combination control designed primarily for use in commercial heating systems. This product stands out for its ability to manage both gas ignition and safety functions, which are critical for maintaining the efficiency and safety of heating appliances. Its robust construction and advanced features make it a popular choice for HVAC professionals and service technicians.

One of the main features of the W7752D is its integration of multiple functions in a single device. It serves as both an automatic gas ignition control and a safety shut-off valve, which simplifies installation and reduces the need for additional components. This integrated design not only enhances reliability but also streamlines maintenance procedures.

Another notable technology utilized in the W7752D is its microprocessor-based control logic. This advanced technology allows for precise management of the ignition sequence, improving the overall efficiency of the heating system. The microprocessor enables the control to adapt to varying operating conditions, ensuring optimal performance even under changing demands.

The W7752D is equipped with features that enhance user-interface and diagnostics capabilities. It includes LED indicators that provide clear information about the operational status and any potential issues. This diagnostics capability facilitates easier troubleshooting, saving time and reducing the likelihood of extended downtimes.

Safety is a primary concern in gas appliances, and the W7752D addresses this with built-in safety mechanisms, including flame detection technologies. These features ensure that the appliance operates safely, automatically shutting down in case of any irregularities during operation. This emphasis on safety not only protects property but also provides peace of mind for users.

In terms of compatibility, the Honeywell W7752D is designed to work with a wide range of gas heating appliances. Its flexibility allows it to be used in various applications, making it suitable for different types of commercial environments. Additionally, the control complies with relevant safety and performance standards, ensuring reliable operation.

In summary, the Honeywell W7752D combines advanced technology with essential safety features, making it a top choice for commercial heating applications. Its integrated design, microprocessor-based control, user-friendly diagnostics, and robust safety mechanisms make it an essential component for efficient and safe gas heating systems. Whether it is for new installations or replacements, the W7752D provides HVAC professionals with the reliability and ease of use they demand.