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Trane Diagnostics, Troubleshooting, Tracer ZN.520 Unit Controller diagnostics, Unit Response

Models: Tracer Unit Ventilator ZN.520

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Diagnostics

Troubleshooting

Diagnostics

Table 28: Tracer™ ZN.520 Unit Controller diagnostics

	Diagnostic	Unit Response	Latching/non-	Reset
	Diagnostic	Unit Response	latching	Reset
			latching


		Fan—OFF		Auto reset once within 24hrs. If
		Valves—OPEN		Auto reset once within 24hrs. If
		Valves—OPEN		safety generates a diagnostic
	Low Coil Temperature	Outdoor air damper—CLOSED		safety generates a diagnostic
	Low Coil Temperature	Outdoor air damper—CLOSED	Latching	more than once a communi-
	Detect2	Face bypass damper—BYPASS	Latching	more than once a communi-
	Detect2	Face bypass damper—BYPASS		cated or manual reset will be
		DX/electric heat—OFF		cated or manual reset will be
		DX/electric heat—OFF		necessary.
		Baseboard heat—OFF		necessary.
		Baseboard heat—OFF

		Fan—OFF
		Valves—CLOSED
	Low Air Flow - Fan Failure2	Outdoor air damper—CLOSED	Latching	Communicated or manual reset
	Low Air Flow - Fan Failure2	Face bypass damper—BYPASS	Latching	Communicated or manual reset
		Face bypass damper—BYPASS
		DX/electric heat—OFF
		Baseboard heat—OFF

		Fan—OFF
		Valves—CLOSED
	Space Temperature	Outdoor air damper—CLOSED	Non-latching	Communicated or manual reset
	Failure2,4	Face bypass damper—BYPASS	Non-latching	Communicated or manual reset
	Failure2,4	Face bypass damper—BYPASS
		DX/electric heat—OFF
		Baseboard heat—OFF

		Fan—ENABLED
		Valves—ENABLED3
	Entering Water Temp	Outdoor air damper—ENABLED3	Non-latching	Communicated or manual reset
	Failure4	Face bypass damper—ENABLED3	Non-latching	Communicated or manual reset
	Failure4	Face bypass damper—ENABLED3
		DX/electric heat—ENABLED3
		Baseboard heat—OFF

		Fan—OFF		Auto reset once within 24hrs. If
		Valves—OPEN		Auto reset once within 24hrs. If
		Valves—OPEN		safety generates a diagnostic
		Outdoor air damper—CLOSED		safety generates a diagnostic
	Discharge Air Temp Limit2	Outdoor air damper—CLOSED	Latching	more than once a communi-
	Discharge Air Temp Limit2	Face bypass damper—BYPASS	Latching	more than once a communi-
		Face bypass damper—BYPASS		cated or manual reset will be
		DX/electric heat—OFF		cated or manual reset will be
		DX/electric heat—OFF		necessary.
		Baseboard heat—OFF		necessary.
		Baseboard heat—OFF

		Fan—OFF
		Valves—CLOSED
	Discharge Air Temp	Outdoor air damper—CLOSED	Non-latching	Communicated or manual reset
	Failure2,4	Face bypass damper—BYPASS	Non-latching	Communicated or manual reset
	Failure2,4	Face bypass damper—BYPASS
		DX/electric heat—OFF
		Baseboard heat—OFF

		Fan—ENABLED
		Valves—ENABLED
		Outdoor air damper—MINIMUM
	Outdoor Air Temp Failure4	POSITION5	Non-latching	Communicated or manual reset
		Face bypass damper—ENABLED
		DX/electric heat—ENABLED
		Baseboard heat—ENABLED

UV-SVP01A-EN

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Trane manual Diagnostics, Troubleshooting, Tracer ZN.520 Unit Controller diagnostics, Unit Response, Latching/non, Reset

Contents

UV-SVP01A-EN Tracer ZN.520 for Classroom Unit VentilatorInstallation Owner Diagnostics Start-up Procedures Installation of New UnitsStart-up Procedures Power Up SequenceNote Manual output test can be initiated at any time General Information Tracer ZN.520 OverviewAdjust Table 1 Tracer ZN.520 Unit Controller features and coil availabilityTemperature General InformationService Button and LED Controller Circuit Board FeaturesPower Generic Auto Test Button Status LED Communications LED CommunicationsTypical Components Controller FeaturesService Test” on page 48, for more infor- mationPeer-to-Peer Communications Communication Configurationsservice tool. See “Configuration” Integrated Comfort SystemStand-Alone Communication ConfigurationsService tool Communication InterfaceCharacteristic Standard End DevicesTable 2 End Device Specifications Device DescriptionStandard End Devices Table 2 End Device Specifications DeviceCharacteristic Outside Air Actuator Face and Bypass Actuator 2-way Control ValveStandard End Devices Table 2 End Device Specifications DeviceCharacteristic 3-way Control Valve Time clock Zone sensorStandard End Devices Table 2 End Device Specifications DeviceCharacteristic Humidity Sensor CO 2 Sensor Fan RelayStandard End Devices Table 2 End Device Specifications DeviceCharacteristic DescriptionInstallation and Wiring SpecificationsDescription Installation and WiringTable 3 Binary inputs typically 24 mA AC TerminalsDescription Installation and WiringTable 4 Binary outputs TerminalsDescription Installation and WiringTable 6 Analog inputs TerminalsInstallation and Wiring MountingFigure 9 Vertical classroom unit ventilator end pocket Installation and WiringFigure 10 Horizontal classroom unit ventilator end pocket Wiring Installation and WiringPower Installation and Wiring Installing the Wall- Mounted Zone Sensor OptionalFigure 14 Relative humidity sensor Figure 15 CO 2 Sensor Installation and WiringHumidity and CO2 Sensors UV-SVP01A-ENTypical Wiring Diagram-Wall Mounted Zone Sensor UV-SVP01A-ENTypical Wiring Diagram-Unit Mounted Zone Sensor UV-SVP01A-ENMounted Switch, Wall Mounted Sensor Typical Wiring Diagram-UnitUV-SVP01A-EN Input/Output Summary Input/Output Summarysummary Input/Output Summary Zone Temperature Setpoint Fan Speed Entering Water TemperatureAnalog Inputs Discharge Air Temperature Outdoor Air Temperature Table 8 Input and output summaryConfiguration Configurable parametersBinary output ConfigurationTable 10 Binary output summary TB4-1/TB4-2Configuration ConfigurationConfiguration Table 11 Binary input summaryDefault ConfigurationTable 13 Fan configuration ranges Fan configuration DefaultDefault ConfigurationTable 15 Setpoint defaults DefaultTable 19 Control wait timer ConfigurationTable 18 Bypass timer range Default DefaultLocation Identifier Unit Identification TagUnit Operation Heating And Cooling Changeover Logic4 = Night Purge air changeover not supported Unit OperationFigure 17 “Heat/Cool Changeover logic” Fan Operation Cooling OperationHeating Operation Unit OperationUnit Operation Valve OperationFace-and-Bypass Damper Operation Exhaust fan/damper operationModulating Outdoor Air Operation Entering Water Temperature SamplingUnit Operation Electric Heat Operation Economizer OperationDX Operation Baseboard Heat OperationFan Status Filter Status/ Maintenance TimerOutput Overrides Other ModesData Sharing-LonWorks Unit OperationFigure 24 “More complex data sharing application” Figure 24 More complex data sharing application Unit OperationUV-SVP01A-EN Unit Operation Heating And Cooling Changeover LogicUnit Operation Figure 17 “Heat/Cool Changeover logic”Heating Operation Unit OperationCooling Operation Fan OperationValve Operation Unit OperationFace-and-Bypass Damper Operation Unit Operation Entering Water Temperature SamplingModulating Outdoor Air Operation DX Operation Unit OperationEconomizer Operation Electric Heat OperationOutput Overrides Filter Status/ Maintenance TimerUnit Operation Fan StatusData Sharing-LonWorks Unit OperationFigure 24 “More complex data sharing application” Figure 24 More complex data sharing application Unit OperationUV-SVP01A-EN Led Operation TroubleshootingManual Output Test DX, or cool or TroubleshootingTable 26 Test sequence for non face-and-bypass unit configurations Face-andDX, or cool or heat TroubleshootingTable 27 Test sequence for face-and-bypass unit configurations Face-andSafeties TroubleshootingTable 28 Tracer ZN.520 Unit Controller diagnostics DiagnosticsTroubleshooting DiagnosticDiagnostic TroubleshootingTable 28 Tracer ZN.520 Unit Controller diagnostics ResetTroubleshooting Translating Multiple DiagnosticsResetting Diagnostics Cycling powerTroubleshooting Questionable unit operationFans Probable cause TroubleshootingTable 30 Valves stay closed Possible ExplanationProbable cause TroubleshootingTable 31 Valves stay open Possible ExplanationProbable cause TroubleshootingTable 33 Outdoor air damper stays closed ExplanationTracer ZN.520 Unit Controller Replacement Replacing Circuit BoardsHardwired Thermistor Values Hardwired Setpoint AdjustmentFan Switch Resistance Values AppendixTable 38 Binary configuration details Appendix-Binary ConfigurationBinary Configuration ConfigurationTable 39 Unit operation based on the effective heat/cool output Appendix-Unit OperationUnit Operation Based On The Effective HEAT/COOL Output Application mode input nviApplicModeApplication mode input Appendix-Unit Operation contTable 39 Unit operation based on the effective heat/cool output Heat/cool mode inputTable 41 Configuration properties1 Appendix-Data ListsData Lists Configuration propertySetting the Time Clock Appendix-TimeclockReview and Change Programs Appendix-TimeclockOverride Program Manual Operation O appears in the display. To return to automatic pro To switch the load permanently OFF, press the key a third timeAppendix-Timeclock UV-SVP01A-ENThis area provided for the removable tag Appendix-Location IdentifierUV-SVP01A-EN Location Identifier UV-SVP01A-ENLocation Identifier UV-SVP01A-ENLocation Identifier UV-SVP01A-ENUV-SVP01A-EN The Trane CompanyLiterature Order Number File Number