Honeywell W7752D Nodeobject, Fcuobject, Validid, Invalidid, Validrequest, Invalidrequest, Enabled

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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

nvoStatus

nvoStatus

nvoStatus

nvoStatus

nvoStatus

nvoStatus

nvoStatus

nvoTerminalLoad

nvoUnitStatus

field name

object_id

invalid_id

invalid_request

disabled

comm_failure

in_alarm

report_mask

mode

Table C4. Output Variables for Excel 10 FCU Controllers.

engineering units:

digital

 

 

state

default

comments

English (metric) or states plus

or

range

 

 

value

 

 

 

 

 

 

 

 

nviSpaceTemp is bound to another node, nvoSpaceTemp is not

 

 

 

reported on the network.

UWORD

 

 

This output variable belongs to the Node Object and reports the

NODE_OBJECT

0

 

status for any object on a node. This is the answer to the

FCU_OBJECT

1

 

nviRequest.

 

 

 

 

Bit

 

 

This output variable indicates whether nviRequest uses a fault

VALID_ID

0

 

object ID.

INVALID_ID

1

 

 

 

 

 

 

Bit

 

 

This output variable indicates whether nviRequest uses a fault

VALID_REQUEST

0

 

request.

INVALID_REQUEST

1

 

 

 

 

 

 

Bit

 

 

This output variable indicates whether the device is enabled or

ENABLED

0

 

disabled (nviManualMode = DISABLE).

DISABLED

1

 

 

 

 

 

 

Bit

 

 

This output variable indicates whether an update nviRcvHrtBt is

COMMUNICATION_OK

0

 

missing.

COMMUNICATION_FAILURE

1

 

 

 

 

 

 

Bit

 

 

This output variable indicates whether an alarm occured. See

NO_ALARM

0

 

nvoAlarm.

IN_ALARM

1

 

 

Bit

 

 

This output variable shows the answer to nviRequest >

NO_REPORT_MASK

0

 

REPORT_MASK

REPORT_MASK

1

 

 

 

 

 

 

SNVT_lev_percent

 

 

This output variable shows the terminal load, which is a percentage

-163..163%

 

 

between -160% and +160% based upon the control output level.

163.835% = INVALID

 

 

Negative values indicate heating load and positive values indicate

 

 

 

cooling load. 100% is the full terminal capacity. An absolute

 

 

 

terminal load value of more than 100% indicate that the terminal is

 

 

 

not able to supply the required heating or cooling energy which at

 

 

 

the zone controller should cause a demand for more supply

 

 

 

energy. nvoHeatOutput will be transmitted immediately when its

 

 

 

value has changed significantly (>= 1%).

SNVT_hvac_mode

 

 

This output variable reports the last operating mode of the control

HVAC_HEAT

1

 

algorithm. It is not set to HVAC_OFF if the Heating and Cooling

HVAC_COOL

3

 

Output shows 0%. HVAC_OFF is set when the Device is disabled

HVAC_OFF

6

 

from nviRequest, nviManualMode or nviApplicMode.

EN2B-0285GE51 R0909

62

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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 Description of Devices Typical system overviewProducts Covered Organization of ManualApplicable Literature Product NamesControl Application Control ProvidedSetpoints Setpoint KnobSetpoint Limits Setpoint from NetworkZEB Energy-Saving Features BypassOccupancy Status Safety Features Operating ModesConstruction Excel 10 W7752 FCU ControllersExcel 10 W7754 FCU Controllers Electrical Shock Hazard180 Controller Performance Specifications General ConfigurationsFan Type Type of Heating and Cooling Equipment Reheat Output Digital InputCommon Temperature Control Master/Slave Controllers Excel 10 Wall Module OptionsAbbreviations and Definitions Overview Plan the SystemDetermine Other Bus Devices Required Step No DescriptionLay Out Communications and Power Wiring Lonworks LayoutPower Wiring Prepare Wiring DiagramsGeneral Considerations Wiring PowerVendor wire type PlenumLOW 230 ONW Orks Termination XAL-TermOrder Equipment Excel 10 Wall ModulesExcel 10 Sensors Echelon-Based Components and PartsConfigure Controllers Using Plug-InsOutput Input Equipment Control FanZone Options Switching LevelsMiscellaneous Troubleshooting Troubleshooting Excel 10 FCU Controllers and Wall ModulesAlarms CommissioningFCU Alarms ReturntonormalBroadcasting the Service Message Manual ModeTemperature Sensor Calibration ProcedureOutput Configuration Options Input Configuration OptionsZone Control Options Network Variable BindingAppendix C LON Interface Page NV name Continuous Automode To 100% For the reheat output EN2B-0285GE51 R0909 Noswitch Byte NtcnonlinearizeNtcnonlinearized Byte FivepositionByte Dinotused DiwindowclosedDioccupiedsensor DiairflowByte Floating OnestageTwostage ThreestageFreeuse Byte ReheatRelnotused Fourpipe TwopipeUword Offset AbsolutemiddleBypassunoccupie NobuttonTable C3. Input Variables for Excel 10 FCU Controllers Modeenable Unsuppressalarms ModedisableSuppressalarms OcnulOFF NUL Rqnormal Rqupdatestatus Rqupdatealarm RqreportmaskInvalid Byte Normalhcmode OFF1OFF2ON1OFF2 OFF1ON2Byte Normalfanmode Ledoff LedonClosed NowindowOpen Table C4. Output Variables for Excel 10 FCU Controllers Rtncomfailtempreset AlarmnotifydisabledRtncomfailsetptoffs RtncomfailschedoccOFF Notassigned Almcomfailmanheat Almcomfailmancool AlmhwswmismatchOcbypass Ocstandby OFF Nofanspeedsw Ubyte FieldeffectoccFieldhwoverride FieldschedoccCtlfanswitchoff CtldisabledOcunoccupied Ocbypass Ocstandby Ocunoccupied Ocbypass Ocstandby OcnulNot Actice Active FanoffafteroncmdFanruns ExternalnotacticeSton StoffInvalid Uword OFF Noreheat NotpressedPressed Contactopen Contactclosed UwordStlow Stmed Sthigh Invalid Byte InitialEnabled DisabledNoalarm 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.
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