Honeywell W7752D specifications Table C3. Input Variables for Excel 10 FCU Controllers

Page 49

EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

field name

nviApplicMode

nviDlcShed

nviEmerg

nviFanSpeedCmd value

nviFanSpeedCmd state

nviInUse

Table C3. Input Variables for Excel 10 FCU Controllers

engineering units:

digital

 

 

state

default

comments

English (metric) or states plus

or

range

 

 

value

 

 

 

 

 

 

 

 

 

SNVT_hvac_mode

 

HVAC_AUTO

This input variable coordinates the controller operation with the

HVAC_AUTO

0

(if bound but fails to be

main equipment controller. Depending upon the available supply

HVAC_HEAT

1

received or at application

energy, the main equipment controller commands the Fan Coil

HVAC_COOL

3

restart)

Unit controller to operate in heat mode only, cool mode only or

HVAC_OFF

6

 

heat and cool mode if appropriate to the configuration.

HVAC_NUL

255

 

HVAC_AUTO means that both heating and cooling equipment are

 

 

 

available, and the current mode is determined by the control

 

 

 

algorithm depending upon the room temperature and effective

 

 

 

setpoint. HVAC_AUTO is invalid for changeover applications.

 

 

 

When the Digital input is configured for Heat/Cool changeover

 

 

 

input, this input will always have priority over the network

 

 

 

nviApplicMode’s HVAC_HEAT or HVAC_COOL.

 

 

 

 

BYTE

 

0 (if bound but fails to be

This input variable is from an energy management system. When

NORMAL

0

received or at application

it is 0, the temperature control algorithm operates in a normal

SETPOINT_SHIFT

1

restart)

mode. When it is 1, the effective setpoint will be shifted by the

 

 

 

amount defined in nciEmergyManag.si_dlc_setpt_bump. For

 

 

 

cooling the effective setpoint will be increased, for heating the

 

 

 

effective setpoint will be decreased always with regard to the frost

 

 

 

protection limit.

 

 

 

 

SNVT_hvac_emerg

 

EMERG_NORMAL

This input variable is an emergency input from a device that

EMERG_NORMAL

0

(at application restart)

determines the correct action during a given emergency (such as

EMERG_PRESSURIZE

1

 

a fire).

EMERG_DEPRESSURIZE

2

 

• EMERG_NORMAL, EMERG_NUL: terminate EMERG_

EMERG_PURGE

3

 

commands and restores the control algorithm.

EMERG_SHUTDOWN

4

 

• EMERG_PRESSURIZE, EMERG_PURGE,

EMERG_NUL

255

 

EMERG_SHUTDOWN: heat/cool outputs OFF, fan ON at

 

 

 

highest speed.

 

 

 

• EMERG_DEPRESSURIZE: heat/cool outputs OFF, fan OFF.

SNVT_switch

 

100%

This input variable allows control of the fan speed by another

0 to 100%

 

(at application restart)

node, such as another Fan Coil Unit Controller acting as a master

 

 

 

in a master/slave relationship.

SNVT_switch

 

NUL

See above.

OFF

0

(at application restart)

 

ON

1

 

 

NUL

255

 

 

UWORD

 

0 (if bound but fails to be

This input variable is used by the engineering tool or other

0 to 65535

 

received), 65535 ( for 60s

supervisory node that it is "logged on" to the controller node. It

 

 

at application restart)

should be set every minute, or the controller will reset it after 60s

 

 

 

to automatically log off the supervisory node.

 

 

 

 

 

 

47

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Contents Excel Appendix B Configuring for Master/Slave Operation Appendix a Using An LNS tool to Commission a Fan Coil UnitAppendix C LON Interface Revision History Typical system overview Description of DevicesOrganization of Manual Products CoveredApplicable Literature Product NamesControl Provided Control ApplicationSetpoint Knob SetpointsSetpoint Limits Setpoint from NetworkZEB Bypass Energy-Saving FeaturesOccupancy Status Operating Modes Safety FeaturesExcel 10 W7752 FCU Controllers ConstructionExcel 10 W7754 FCU Controllers Electrical Shock Hazard180 Controller Performance Specifications General ConfigurationsFan Type Type of Heating and Cooling Equipment Digital Input Reheat OutputExcel 10 Wall Module Options Common Temperature Control Master/Slave ControllersAbbreviations and Definitions Plan the System OverviewDetermine Other Bus Devices Required Step No DescriptionLonworks Layout Lay Out Communications and Power WiringPower Wiring Prepare Wiring DiagramsGeneral Considerations Power WiringVendor wire type PlenumLOW 230 XAL-Term ONW Orks TerminationExcel 10 Wall Modules Order EquipmentExcel 10 Sensors Echelon-Based Components and PartsUsing Plug-Ins Configure ControllersOutput Input Fan Equipment ControlZone Options Switching LevelsMiscellaneous Troubleshooting Excel 10 FCU Controllers and Wall Modules TroubleshootingAlarms CommissioningReturntonormal FCU AlarmsManual Mode Broadcasting the Service MessageProcedure Temperature Sensor CalibrationInput Configuration Options Output Configuration OptionsZone Control Options Network Variable BindingAppendix C LON Interface Page NV name Continuous Automode To 100% For the reheat output EN2B-0285GE51 R0909 Byte Ntcnonlinearize NoswitchNtcnonlinearized Byte FivepositionDiwindowclosed Byte DinotusedDioccupiedsensor DiairflowOnestage Byte FloatingTwostage ThreestageFreeuse Byte ReheatRelnotused Twopipe FourpipeUword Absolutemiddle OffsetBypassunoccupie NobuttonTable C3. Input Variables for Excel 10 FCU Controllers Modedisable Modeenable UnsuppressalarmsSuppressalarms OcnulOFF NUL Rqnormal Rqupdatestatus Rqupdatealarm RqreportmaskInvalid OFF1OFF2 Byte NormalhcmodeON1OFF2 OFF1ON2Ledoff Ledon Byte NormalfanmodeClosed NowindowOpen Table C4. Output Variables for Excel 10 FCU Controllers Alarmnotifydisabled RtncomfailtempresetRtncomfailsetptoffs RtncomfailschedoccOFF Notassigned Almcomfailmanheat Almcomfailmancool AlmhwswmismatchOcbypass Ocstandby Fieldeffectocc OFF Nofanspeedsw UbyteFieldhwoverride FieldschedoccCtldisabled CtlfanswitchoffOcunoccupied Ocbypass Ocstandby Ocunoccupied Ocbypass Ocstandby OcnulFanoffafteroncmd Not Actice ActiveFanruns ExternalnotacticeSton StoffInvalid Uword Notpressed OFF NoreheatPressed Contactopen Contactclosed UwordInvalid Byte Initial Stlow Stmed SthighDisabled EnabledNoalarm InalarmOpen Nowindow Alarm Suppressalarms AlarmnotifydisabledBugver Nodetype Word Table C5. Unused Variables for Excel 10 FCU ControllersAutomation 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.
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