Honeywell W7752D specifications Safety Features, Operating Modes

Page 10

EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

Safety Features

Frost Protection

If the room temperature falls below 46.4 °F (8 °C), the Excel 10 FCU Controller enables the heating circuit to ensure frost protection and an alarm is issued. When the temperature rises above 48.2 °F (9 °C) again, the heating circuit is turned OFF again.

Smoke Control

The Excel 10 FCU Controller will respond to LONWORKS network emergency commands by switching OFF heating/cooling outputs and switching OFF the fan (depressurize) or switching ON the fan at its highest speed (pressurize). An alarm is issued for any emergency commands

Fan Failure Protection

When configured with an airflow detector, the Excel 10 FCU Controller protects equipment by switching OFF heating / cooling outputs and issuing an alarm when the fan fails.

Fan Interlocks

The Excel 10 FCU Controller can be configured such that heating and/or cooling outputs are never ON unless the fan is running. A fan run-up time can be configured to turn ON the fan prior to the heating/cooling outputs being switched ON, and a fan overrun time can be configured to keep the fan running for a period of time after the heating/cooling outputs are switched OFF.

Operating Modes

The possible modes of operation are listed in Table 4.

Table 4. Modes of operation for Excel 10 FCU Controller

mode

description

events causing a transition to this mode

operational modes (NV reference)

 

START-UP AND

Control algorithms are disabled. Outputs stay in

This is the first mode after an application restart.

WAIT

their initial positions. Physical inputs are periodically

 

 

read and digital filtering of analog inputs is turned

 

 

OFF to speed up settling time. Input NVs are

 

 

received and output NVs are sent periodically.

 

FLOATING

The Excel 10 FCU Controller drives the floating

When the effective occupancy changes to

OUTPUTS SYNCH

control valves to their initial positions and then

"unoccupied" or "standby", after start-up, after 24

 

transitions to one of the control modes.

hours since the last positioning, or after each

 

 

positioning to 0%, the Excel 10 FCU Controller

 

 

transitions to this mode.

COOLING

The Excel 10 FCU Controller is controlling in the

Network input nviApplicMode has a value of

 

cooling mode.

HVAC_COOL or HVAC_AUTO and the space

 

 

temperature is above the cooling setpoint.

HEATING

The Excel 10 FCU Controller is controlling in the

Network input nviApplicMode has the value of

 

heating mode.

HVAC_HEAT or HVAC_AUTO and the space

 

 

temperature is below the heating setpoint.

MANUAL MODE

The control algorithms stay active and outputs are

Network input nviManualMode has value of

 

controlled automatically until set individually to test

MODE_MANUAL.

 

positions using the input NV nviTest.

 

FACTORY TEST

Control algorithm is disabled; a special factory test

This mode is for factory testing, only.

 

program runs.

 

DISABLED

Control algorithms are terminated, outputs are

Network input nviManualMode has a value of

 

turned OFF (turn-OFF sequences and interlocks are

MODE_DISABLED.

 

active). Frost protection is disabled.

 

PRESSURIZE

Heating/cooling outputs are switched OFF, and the

Network input nviEmerg containing smoke control

 

fan is switched ON at its highest speed.

signal from the LONWORKS network has the value

 

 

of EMERG_PRESSURIZE.

DEPRESSURIZE

Heating, cooling, and fan outputs are switched OFF.

Network input nviEmerg containing smoke control

 

 

signal from the LONWORKS network has the value

 

 

of EMERG_DEPRESSURIZE.

EN2B-0285GE51 R0909

8

Page 9 Page 11
Image 10
Page 9 Page 11
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 overviewApplicable Literature Products CoveredOrganization of Manual Product NamesControl Application Control ProvidedSetpoint Limits SetpointsSetpoint Knob Setpoint from Network ZEB Energy-Saving Features BypassOccupancy Status Safety Features Operating ModesExcel 10 W7754 FCU Controllers ConstructionExcel 10 W7752 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 Determine Other Bus Devices Required OverviewPlan the System Step No DescriptionLay Out Communications and Power Wiring Lonworks LayoutPower Wiring Prepare Wiring DiagramsGeneral 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 FanZone Options Switching LevelsMiscellaneous 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 ThreestageFreeuse Byte ReheatRelnotused Fourpipe TwopipeUword Bypassunoccupie OffsetAbsolutemiddle NobuttonTable C3. Input Variables for Excel 10 FCU Controllers Suppressalarms Modeenable UnsuppressalarmsModedisable OcnulOFF NUL Rqnormal Rqupdatestatus Rqupdatealarm RqreportmaskInvalid ON1OFF2 Byte NormalhcmodeOFF1OFF2 OFF1ON2Byte Normalfanmode Ledoff LedonClosed NowindowOpen Table C4. Output Variables for Excel 10 FCU Controllers Rtncomfailsetptoffs RtncomfailtempresetAlarmnotifydisabled RtncomfailschedoccOFF Notassigned Almcomfailmanheat Almcomfailmancool AlmhwswmismatchOcbypass Ocstandby Fieldhwoverride OFF Nofanspeedsw UbyteFieldeffectocc FieldschedoccOcunoccupied Ocbypass Ocstandby CtlfanswitchoffCtldisabled Ocunoccupied Ocbypass Ocstandby OcnulFanruns Not Actice ActiveFanoffafteroncmd ExternalnotacticeSton StoffInvalid 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
Top Page Image Contents