Trane ZN.520, Tracer Unit Ventilator manual Translating Multiple Diagnostics

Page 60

Troubleshooting

Table 28: Tracer™ ZN.520 Unit Controller diagnostics

Diagnostic

Unit Response

Latching/non-

Reset

latching

 

 

 

 

 

 

 

 

 

 

 

 

Fan—DISABLED

 

 

 

Valves—DISABLED

 

 

Invalid Unit Configuration2

Outdoor air damper—DISABLED

Non-latching

Communicated or manual reset

Face bypass damper—DISABLED

 

 

 

 

DX/electric heat—DISABLED

 

 

 

Baseboard heat—DISABLED

 

 

 

 

 

 

 

Fans—ENABLED

 

 

 

Valves—ENABLED

 

 

Normal

Outdoor air damper—ENABLED

Non-latching

Communicated or manual reset

Face bypass damper—ENABLED

 

 

 

 

DX/electric heat—ENABLED

 

 

 

Baseboard heat—ENABLED

 

 

 

 

 

 

Note1: The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.

Note2: During manual output test, these diagnostics make the green status LED light in a two-blink pattern. For more information see, Manual Output Test, on page 48 for more information.)

Note3: When the entering water temperature is required but not present, the Tracer™ ZN.520 Unit Controller generates a diagnostic to indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid entering water temperature value is present (non-latching diagnostic). When the entering water temperature sensor fails, the controller prohibits all hydronic cooling operation, but allows the delivery of heat when heating is required. In the COOL mode, all hydronic cooling is locked-out, but normal fan and outdoor air damper operation is permitted.

Note4: These diagnostics are non-latching and automatically reset when the input is present and valid.

Note5: When the outdoor air temperature sensor has failed or is not present, the Tracer™ ZN.520 Unit Controller generates a diagnostic to indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid outdoor air temperature value is present (non-latching diagnostic). When the outdoor air temperature sensor fails or is not present, the controller prohibits economizer operation. A value of Enable or Disable for nviEconEnable overrides these decisions, regardless of the presence of an outdoor air temperature value or failure.For more information see, Interoperability, on page 12 for more information.)For more information see, Data Sharing—LonWorks, on page 46 for more information.)

Translating Multiple Diagnostics

The controller senses and records each diagnostic independently of other diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics are reported in the order they oc- cur.

Resetting

Diagnostics

There are many ways to reset unit diagnostics:

qBy cycling the fan switch from off to any speed setting

Automatically

The Tracer™ ZN.520 Unit Control- ler includes an automatic diagnos- tic reset function. This function attempts to automatically recover a unit when the Low Coil Temper- ature Detection diagnostic occurs. When this diagnostic occurs, the controller responds as defined in

Table 28: Tracer™ ZN.520 Unit Controller

diagnostics.

agnostic occurs.

If a Low Coil Temperature Detec- tion diagnostic recurs within 24 hours after an automatic diagnos- tic reset, you must manually reset the diagnostic. See other possible methods for resetting diagnostics in this section.

Manual output test

The TEST button on the controller may be used either during installa- tion to verify proper end device operation or during troubleshoot-

qAutomatically by the controller

qBy initiating a manual output test at the controller

qBy cycling power to the controller

qBy using a building automation system

qBy using the Rover service tool

After the controller detects the Low Coil Temperature Detection diagnostic, the unit waits 30 min- utes before invoking the automatic diagnostic reset function. The au- tomatic diagnostic reset function clears the Low Coil Temperature Detection diagnostic and attempts to restore the controller to normal operation. The controller resumes normal operation until another di-

ing. When depressed, the Test but- ton, the controller exercises all outputs in a predefined sequence. The first and last steps of the se- quence reset the controller diag- nostics. (See “Manual Output Test” on

page 48.for more information.)

Cycling power

When turned-off, the controller's 24 VAC power, and re-applies

UV-SVP01A-EN

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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 boardController Features ServiceTypical Components Communication Configurations Peer-to-Peer CommunicationsIntegrated Comfort System Stand-Alone Communication InterfaceInteroperability 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 LimitsOccupied Bypass Timer Power-Up Control WaitMaintenance Timers Location Identifier Unit Identification TagWinking 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 Valves stay closed Probable cause Possible ExplanationValves stay open Probable cause Possible Explanation DX/Electric Heat Outside Air DamperOutdoor 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
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