Replacing Circuit Boards | Trane Tracer Unit Ventilator, ZN.520

Replacing Circuit Boards

Tracer ZN.520 Unit Controller Replacement

1.Disconnect power or disable the circuit breaker to unit.

2.Remove bad or questionable Tracer ZN.520 controller cir- cuit board.

3.Install controller in the unit with the heat-sink placement at the top of the control box. (See page 32).

4.Connect the power to the cir- cuit board ONLY.

5.Connect Rover and properly configure the controller, unless a previously config- ured board is purchased.

6.Power down.

7.Connect the remaining input and output wiring to the con- troller.

8.Reapply power.

9.Complete sequence 7 and 8 above in the installation sec- tion of this manual.

10.Refer to BAS manual for instructions on how to install the new ZN.520 into BAS sys- tem.

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Trane Tracer Unit Ventilator manual Replacing Circuit Boards, Tracer ZN.520 Unit Controller Replacement

Contents

Tracer ZN.520 for Classroom Unit Ventilator Installation Owner Diagnostics Installation of New Units Start-up Procedures Power Up Sequence Tracer ZN.520 Overview General Information General Information Tracer ZN.520 unit controller circuit board Controller Circuit Board Features Typical Components Controller FeaturesService Integrated Comfort System Communication ConfigurationsPeer-to-Peer Communications Interoperability Stand-AloneCommunication Interface Characteristic End Device SpecificationsStandard End Devices Description Standard End Devices Way Control Valve Time clock Zone sensor Dpdt Control Transformer Specifications Installation and Wiring Binary Inputs Generic/baseboard Heat Binary Output Binary Outputs Analog inputs Analog Inputs Mounting Vertical classroom unit ventilator end pocket Power Wiring Proper zone sensor placement Installing the Wall- Mounted Zone Sensor Optional Humidity 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 Summary Input/Output Summary Configurable parameters ConfigurationCooling source Heating source Binary Outputs1 Binary Inputs1 Binary input summary ConfigurationAnalog Inputs1 Analog input summary End Device Configurations Fan ConfigurationFan configuration ranges Default Discharge air limit ranges Default Valid range Setpoint defaults Default Valid rangeSetpoints Discharge Air Limits Maintenance Timers Occupied Bypass TimerPower-Up Control Wait Winking Location IdentifierUnit Identification Tag Unit Operation Power-UpHeating And Cooling Changeover Logic Occupancy Heat/Cool Changeover logic Cooling Operation Fan Off DelayHeating Operation Fan Operation Face-and-Bypass Damper Operation Valve OperationExhaust fan/damper operation Modulating Valves Water assumption chart Entering Water Temperature SamplingUnit Configuration Temperature Assumed1 DX Operation Economizer OperationElectric Heat Operation Baseboard Heat Operation Output Overrides Filter Status/ Maintenance TimerFan Status Other Modes Simple data sharing application Data Sharing-LonWorks More 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 Red Service LED TroubleshootingBlack Service Push Button Yellow Comm LED Exit6 Test Procedure Troubleshooting Entering Water Temperature Failure Space Temperature FailureDischarge Air Temperature Limit Outdoor Air Temperature Failure Diagnostics Troubleshooting Translating Multiple Diagnostics Fans Rover service tool Valves stay open Probable cause Possible Explanation ValvesValves stay closed Probable cause Possible Explanation Outdoor air damper stays closed Probable cause Explanation DX/Electric HeatOutside Air Damper Probable Cause Explanation Outdoor air damper stays open Replacing Circuit Boards Tracer ZN.520 Unit Controller Replacement Fan Switch Resistance Values Hardwired Setpoint AdjustmentHardwired Thermistor Values Appendix Binary Configuration Appendix-Binary ConfigurationBinary configuration details Binary input or output Function Effective heat/ cool mode output nvoHeatCool Heat/cool mode input NviHeatCoolAppendix-Unit Operation Unit Operation Based On The Effective HEAT/COOL Output Appendix-Unit Operation Appendix-Data Lists Configuration properties1Data Lists Input/output listing1 Appendix-Timeclock Setting the Time ClockSet the Time and Day Set the Program Override Program Manual Operation Review and Change Programs Appendix-Timeclock Appendix-Location Identifier Location Identifier Location Identifier Location Identifier Trane Company