Trane ZN.520, Tracer Unit Ventilator manual Data Sharing-LonWorks

Page 52

Unit Operation

OFF due to a safety or command. The controller enters the FREEZE AVOIDANCE mode when an out- door air temperature is present (communicated or hardwired) and it is below the freeze avoidance set- point (configurable). The controller disables freeze avoidance when the outdoor air temperature rises 3°F above the freeze avoidance setpoint.

When the controller is in the freeze avoidance mode:

qAll water valves are driven open to allow water flow through the coil

qFan is OFF

qFace-and-bypass damper (when present) is in full BYPASS

qDX and electric heat are OFF

MORNING WARM-UP

The Tracer ZN.520 controller keeps the modulating outdoor air damp- er closed anytime during the OCCU- PIED mode when the space temperature is 3°F or more below the heating setpoint.

Figure 23: Simple data sharing application

The damper remains closed indefi- nitely during morning warm-up until the space temperature is with- in 2°F of the effective heating set- point. The unit runs at full capacity until setpoint is met.

COOL-DOWN

The Tracer ZN.520 controller keeps the modulating outdoor air damp- er closed for up to one hour at ev- ery transition from UNOCCUPIED to OCCUPIED mode when the space temperature is 3°F or more above the cooling setpoint.

The damper remains closed during cool-down until the space temper- ature is within 2°F of the effective cooling setpoint. The unit runs at full capacity until setpoint is met.

Data Sharing—LonWorks

Tracer ZN.520 allows peer-to-peer data communication through the use of LonWork’s technology. Data such as space temperature set- point, occupancy, etc. can be shared from a master controller to

a peer controller over a twisted pair of communication wire with or without the presence of a front end

building management system. (See Figure 23: “Simple data shar- ing application”) This ability al-

lows units to operate with the same data to prevent conflicting control.

Data sharing is established through the use of “bindings”. Bindings are set up through the Rover service tool.

The Tracer ZN.520 controller in- cludes a network variable for mas- ter/slave operation. This variable includes all of the information re- quired for the slave units to oper- ate with master controller. (See

Figure 24: “More complex data sharing application”)

For more information on establish- ing bindings, see the Rover service tool manual. For a complete listing on shared points see “Appendix— Data Lists” on page64.

46

UV-SVP01A-EN

Page 51 Page 53
Image 52
Page 51 Page 53
Contents Installation Owner Diagnostics Tracer ZN.520 for Classroom Unit VentilatorStart-up Procedures Installation of New UnitsPower Up Sequence General Information Tracer ZN.520 OverviewGeneral Information Controller Circuit Board Features Tracer ZN.520 unit controller circuit boardService Controller FeaturesTypical Components Peer-to-Peer Communications Communication ConfigurationsIntegrated Comfort System Communication Interface Stand-AloneInteroperability End Device Specifications CharacteristicStandard End Devices DescriptionStandard End Devices Way Control Valve Time clock Zone sensor Dpdt Control Transformer Installation and Wiring SpecificationsBinary Inputs Binary Outputs Generic/baseboard Heat Binary OutputAnalog Inputs Analog inputsMounting Vertical classroom unit ventilator end pocket Wiring PowerInstalling the Wall- Mounted Zone Sensor Optional Proper zone sensor placementHumidity and CO2 Sensors Typical Wiring Diagram-Wall Mounted Zone Sensor Typical Wiring Diagram-Unit Mounted Zone Sensor Typical Wiring Diagram-Unit Input/Output Summary Input and output summaryInput/Output Summary Configuration Configurable parametersCooling source Heating sourceBinary Outputs1 Binary input summary Configuration Binary Inputs1Analog Inputs1 Analog input summaryFan Configuration End Device ConfigurationsFan configuration ranges DefaultSetpoint defaults Default Valid range Discharge air limit ranges Default Valid rangeSetpoints Discharge Air LimitsPower-Up Control Wait Occupied Bypass TimerMaintenance Timers Unit Identification Tag Location IdentifierWinking Power-Up Unit OperationHeating And Cooling Changeover Logic OccupancyHeat/Cool Changeover logic Fan Off Delay Cooling OperationHeating Operation Fan OperationValve Operation Face-and-Bypass Damper OperationExhaust fan/damper operation Modulating ValvesEntering Water Temperature Sampling Water assumption chartUnit Configuration Temperature Assumed1Economizer Operation DX OperationElectric Heat Operation Baseboard Heat OperationFilter Status/ Maintenance Timer Output OverridesFan Status Other ModesData Sharing-LonWorks Simple data sharing applicationMore complex data sharing application Heating And Cooling Changeover Logic Heat/Cool Changeover logic Cooling Operation Valve Operation Entering Water Temperature Sampling Economizer Operation Output Overrides Data Sharing-LonWorks More complex data sharing application Troubleshooting Red Service LEDBlack Service Push Button Yellow Comm LEDTest Procedure Exit6Troubleshooting Space Temperature Failure Entering Water Temperature FailureDischarge Air Temperature Limit Outdoor Air Temperature FailureDiagnostics Troubleshooting Translating Multiple Diagnostics Rover service tool FansValves stay closed Probable cause Possible Explanation ValvesValves stay open Probable cause Possible Explanation Outside Air Damper DX/Electric HeatOutdoor air damper stays closed Probable cause Explanation Outdoor air damper stays open Probable Cause ExplanationTracer ZN.520 Unit Controller Replacement Replacing Circuit BoardsHardwired Setpoint Adjustment Fan Switch Resistance ValuesHardwired Thermistor Values AppendixAppendix-Binary Configuration Binary ConfigurationBinary configuration details Binary input or output FunctionHeat/cool mode input NviHeatCool Effective heat/ cool mode output nvoHeatCoolAppendix-Unit Operation Unit Operation Based On The Effective HEAT/COOL OutputAppendix-Unit Operation Configuration properties1 Appendix-Data ListsData Lists Input/output listing1Setting the Time Clock Appendix-TimeclockSet the Time and Day Set the ProgramReview and Change Programs Override Program Manual OperationAppendix-Timeclock Appendix-Location Identifier Location Identifier Location Identifier Location Identifier Trane Company
Top Page Image Contents