Trane Tracer Unit Ventilator, ZN.520 manual Controller Features, Service, Typical Components

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Controller Features

Each Tracer ZN.520 unit controller circuit board is equipped with en- hancements to help facilitate ser- vice, testing, and diagnosis.

Each board has

qManual test button,

qStatus LED,

qCommunication status LED,

qService button,

qQuick terminal connectors, and

qEasy to read screen printing. (See Figure 1: “Tracer ZN.520 Control Board”).

Service

The Trane Tracer ZN.520 unit con- troller is serviced using Rover®, the ICS software service too. Rover is designed to support the Tracer ZN.520 unit controller on the class- room unit ventilator.

For “remote” access to the com- municating units, the zone sensors offered with the Tracer ZN.520 have a telephone style (RJ-11) con- nector allowing field connection between Rover and the zone sen- sor; however, the RJ-11 connector must be connected to the terminals TB2-5 and TB2-6 on the Tracer ZN.520 unit controller.(See Figure

3:“Rover service tool connected to the RJ-11 communication jack in a zone sensor”)

The zone sensor may also be used when trying to locate a unit. By pressing the ON button on the zone sensor for 5 seconds or using the “wink” command in Rover, the cir- cuit board receives the signal caus- ing the Communication LED to “wink”. Winking allows visual identifier on the board for service technicians.

The Tracer ZN.520 also includes features such as a test output to manually test all of the end devices and color coded wires (i.e. red for heating valves and blue for cooling valves) to aid in the troubleshoot- ing process.(See “Manual Output

Test” on page 48, for more infor- mation.)

Figure 3: Rover service tool connected to the RJ-11 communication jack in a zone sensor

Typical Components

A typical classroom unit ventilator system with a DDC package con- sists of the following physical com- ponents, in addition to the mechanical equipment:

qTracer ZN.520—contains the sensor input circuits, service adjustments, microprocessor control electronics, and communications hardware.

Power is supplied by a separately mounted 24 VAC\90 VA transformer.

qSensor Modules—a variety of analog sensors that provide temperature and optional humidity sensing and CO2 sensor; and an operator interface to the Tracer ZN.520 for operating modes, status, and temperature setpoints.

qStandard End Devices—a variety of devices that help to gather information, control capacity, and provide ventilation are used by the Tracer ZN.520 in its control algorithm to condition the space to the desired temperature and relative humidity level. (See “Standard End Devices” on page13, for more information.)

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Contents Tracer ZN.520 for Classroom Unit Ventilator Installation Owner DiagnosticsInstallation of New Units Start-up ProceduresPower Up Sequence Tracer ZN.520 Overview General InformationGeneral Information Tracer ZN.520 unit controller circuit board Controller Circuit Board FeaturesService Controller FeaturesTypical Components Peer-to-Peer Communications Communication ConfigurationsIntegrated Comfort System Communication Interface Stand-AloneInteroperability Description End Device SpecificationsCharacteristic Standard End DevicesStandard End Devices Way Control Valve Time clock Zone sensor Dpdt Control Transformer Specifications Installation and WiringBinary Inputs Generic/baseboard Heat Binary Output Binary OutputsAnalog inputs Analog InputsMounting Vertical classroom unit ventilator end pocket Power WiringProper zone sensor placement Installing the Wall- Mounted Zone Sensor OptionalHumidity and CO2 Sensors Typical Wiring Diagram-Wall Mounted Zone Sensor Typical Wiring Diagram-Unit Mounted Zone Sensor Typical Wiring Diagram-Unit Input and output summary Input/Output SummaryInput/Output Summary Heating source ConfigurationConfigurable parameters Cooling sourceBinary Outputs1 Analog input summary Binary input summary ConfigurationBinary Inputs1 Analog Inputs1Default Fan ConfigurationEnd Device Configurations Fan configuration rangesDischarge Air Limits Setpoint defaults Default Valid rangeDischarge air limit ranges Default Valid range SetpointsPower-Up Control Wait Occupied Bypass TimerMaintenance Timers Unit Identification Tag Location IdentifierWinking Occupancy Power-UpUnit Operation Heating And Cooling Changeover LogicHeat/Cool Changeover logic Fan Operation Fan Off DelayCooling Operation Heating OperationModulating Valves Valve OperationFace-and-Bypass Damper Operation Exhaust fan/damper operationTemperature Assumed1 Entering Water Temperature SamplingWater assumption chart Unit ConfigurationBaseboard Heat Operation Economizer OperationDX Operation Electric Heat OperationOther Modes Filter Status/ Maintenance TimerOutput Overrides Fan StatusSimple data sharing application Data Sharing-LonWorksMore 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 Yellow Comm LED TroubleshootingRed Service LED Black Service Push ButtonExit6 Test ProcedureTroubleshooting Outdoor Air Temperature Failure Space Temperature FailureEntering Water Temperature Failure Discharge Air Temperature LimitDiagnostics Troubleshooting Translating Multiple Diagnostics Fans Rover service toolValves 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 Probable Cause Explanation Outdoor air damper stays openReplacing Circuit Boards Tracer ZN.520 Unit Controller ReplacementAppendix Hardwired Setpoint AdjustmentFan Switch Resistance Values Hardwired Thermistor ValuesFunction Appendix-Binary ConfigurationBinary Configuration Binary configuration details Binary input or outputUnit Operation Based On The Effective HEAT/COOL Output Heat/cool mode input NviHeatCoolEffective heat/ cool mode output nvoHeatCool Appendix-Unit OperationAppendix-Unit Operation Input/output listing1 Configuration properties1Appendix-Data Lists Data ListsSet the Program Setting the Time ClockAppendix-Timeclock Set the Time and DayOverride Program Manual Operation Review and Change ProgramsAppendix-Timeclock Appendix-Location Identifier Location Identifier Location Identifier Location Identifier Trane Company
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