Honeywell W7752D specifications Returntonormal, FCU Alarms

Page 33

EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

Table 24. Excel 10 FCU Controller alarms.

 

Name of alarm or alarm bit

alarm type

 

meaning of alarm code or alarm bit

 

number

 

 

 

 

 

 

No Alarm/Return to Normal:

 

 

 

 

RETURN_TO_NORMAL

128

 

Return to no error after being in an error condition. This code is added

 

 

 

 

numerically to another alarm code to indicate that the error condition has

 

 

 

 

returned to normal.

 

ALARM_NOTIFY_DISABLED

255

The alarm reporting has been turned OFF by the nviManualMode

 

 

 

 

=SUPPRESS_ALARMS. No more alarms are reported until

 

 

 

 

nviManualMode turns ON alarm reporting or upon application restart.

 

ALM_NO_ALARM

0

No errors since last application restart; initial condition

 

 

 

 

 

 

FCU Alarms:

 

 

 

 

ALM_NODE_OFF

1

The control algorithm has stopped due to controller disabled, or in test

 

 

 

 

mode, or other conditions

 

ALM_FROST

2

The space temperature is below the frost alarm limit. The alarm condition

 

 

 

 

remains until the temperature exceeds the alarm limit plus hysteresis.

 

ALM_INVALID_SETPNT

3

 

One of the setpoints is not in the valid range

 

ALM_TEMP_SENSOR_FAIL

4

Temperature sensor failed

 

 

 

 

 

ALM_SETPNT_KNOB_FAIL

5

Remote setpoint potentiometer failed

 

ALM_FAN_SPEED_SW_FAIL

6

Fan speed switch failed

 

ALM_FAN_FAILURE

7

 

Fan is commanded to be ON, but the air flow detector input does not

 

 

 

 

detect the fan running.

 

ALM_COMFAIL_SPACE_TEMP

8

nviSpaceTemp is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_HVACMODE

9

nviApplicMode is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_SETPTOFFS

10

nviSetPtOffset is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_SCHEDOCC

11

nviTodEvent is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_DLC

12

nviDlcShed is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_TEMPRESET

13

nviTempReset is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_ODTEMP

14

nviOdTemp is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_OCCSENSOR

15

nviSensorOcc is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_WINDOW

16

nviWindow is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_MANHEAT

17

nviManHeat is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_COMFAIL_MANCOOL

18

nviManCool is bound and has failed in receiving an update within its

 

 

 

 

specified FAILURE_DETECT_TIME

 

ALM_HW_SW_MISMATCH

19

 

The software is not compatible with the hardware configuration specified

 

 

 

 

by the hardware configuration resistor value. Compatibility is checked

 

 

 

 

only once after application restart.

31

EN2B-0285GE51 R0909

Image 33
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 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 Configurations GeneralFan 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 WiringPrepare Wiring Diagrams Power WiringGeneral 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 ControlSwitching Levels Zone OptionsMiscellaneous 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 ThreestageByte Reheat FreeuseRelnotused Twopipe FourpipeUword Absolutemiddle OffsetBypassunoccupie NobuttonTable C3. Input Variables for Excel 10 FCU Controllers Modedisable Modeenable UnsuppressalarmsSuppressalarms OcnulRqnormal Rqupdatestatus Rqupdatealarm Rqreportmask OFF NULInvalid OFF1OFF2 Byte NormalhcmodeON1OFF2 OFF1ON2Ledoff Ledon Byte NormalfanmodeNowindow ClosedOpen Table C4. Output Variables for Excel 10 FCU Controllers Alarmnotifydisabled RtncomfailtempresetRtncomfailsetptoffs RtncomfailschedoccAlmcomfailmanheat Almcomfailmancool Almhwswmismatch OFF NotassignedOcbypass Ocstandby Fieldeffectocc OFF Nofanspeedsw UbyteFieldhwoverride FieldschedoccCtldisabled CtlfanswitchoffOcunoccupied Ocbypass Ocstandby Ocunoccupied Ocbypass Ocstandby OcnulFanoffafteroncmd Not Actice ActiveFanruns ExternalnotacticeStoff StonInvalid 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.