Honeywell W7752D specifications Byte Reheat, Freeuse, Relnotused

Page 45

EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

nciFcuConfig

nciFcuConfig

nciFcuConfig

nciFcuConfig

nciFcuConfig

nciFcuConfig

nciFcuConfig

nciFcuGains

field name

cycle_time[0]

cycle_time[1]

min_stage_off_time[0]

min_stage_off_time[1]

reheat_config

PwmZeroPosn

PwmFullPosn

si_pid_Xp[0]

Table C2. Configuration Variables for Excel 10 FCU Controllers

engineering units:

digital

 

 

state

default

comments

English (metric) or states

or

plus range

 

 

value

 

 

 

 

 

SNVT_time_sec

 

150 s for floating

This configuration variable specifies for the output 1 configured as

0 to 1200s for stage output

 

 

• FLOATING: the runtime of the valve (time to run from fully closed to

0 to 600s for floating output

 

 

fully open)

20 to 600s for PWM output

 

 

• PWM: the cycle time

 

 

 

• ONE_STAGE, TWO_STAGE, and THREE_STAGE: minimum ON

 

 

 

time before switching to the next stage.

 

 

 

 

SNVT_time_sec

 

150 s for floating

This configuration variable specifies for the output 2 configured as

0 to 1200s for stage output

 

 

• FLOATING: the runtime of the valve (time to run from fully closed to

0 to 600s for floating output

 

 

fully open)

20 to 600s for PWM output

 

 

• PWM: the cycle time

 

 

 

• ONE_STAGE, TWO_STAGE, and THREE_STAGE: minimum ON

 

 

 

time before switching to the next stage.

 

 

 

 

SNVT_time_sec

 

90 s

This configuration variable is used only for ONE_STAGE,

0 to 600 seconds

 

 

TWO_STAGE, and THREE_STAGE output 1 and specifies the mini-

 

 

 

mum OFF time before switching to the next stage.

SNVT_time_sec

 

90 s

This configuration variable is used only for ONE_STAGE,

0 to 600 seconds

 

 

TWO_STAGE, and THREE_STAGE output 2 and specifies the mini-

 

 

 

mum OFF time before switching to the next stage

 

 

 

 

BYTE

 

REHEAT

This configuration variable specifies the usage of the reheat relay.

REHEAT

0

 

FREE_USE specifies that the relay is controlled via the network using

FREE_USE

1

 

the nviReheatRelay .

REL_NOT_USED

255

 

 

 

 

 

 

SNVT_lev_percent

 

0%

This configuration variable specifies the zero position for PWM

0 to 100%

 

 

actuators. This setting applies to PWM actuators only and is used for

 

 

 

both actuators if both are configured as PWM actuators.

SNVT_lev_percent

 

100%

This configuration variable specifies the fully open position for PWM

0 to 100%

 

 

actuators. This setting applies to PWM actuators only and is used for

 

 

 

both actuators if both are configured as PWM actuators.

 

 

 

 

SNVT_temp_p

 

36 DDF (20 K)

This configuration variable specifies the throttling range for use in the

2.25 to 180 DDF

 

 

proportional portion of the PID loop gain for the cooling mode. The

(1.25 to 100 K), 0 = Disable

 

 

minimum configurable value (not including 0 for disabling) is 3.6 DDF

 

 

 

(2 K) for PI or 2.25 DDF (1.25 K) for P control. For versions prior to

 

 

 

1.0.3, the minimum value is 7.2 DDF (4 K).

 

 

 

 

43

EN2B-0285GE51 R0909

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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 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.
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