Trane Tracer Unit Ventilator, ZN.520 manual Setpoints, Discharge Air Limits, Freeze Avoidance

Page 33

Configuration

Setpoints

Table 15: Setpoint defaults

Setpoint	Default	Valid range

Occupied heating setpoint	71°F	40 to 115° F
Occupied cooling setpoint	74°F	40 to 115° F
Occupied standby heating setpoint	67 °F	40 to 115° F
Occupied standby cooling setpoint	78 °F	40 to 115° F
Unoccupied heating setpoint	60°F	40 to 115° F
Unoccupied cooling setpoint	85°F	40 to 115° F
Heating setpoint low limit1	40°F	40 to 115° F
Cooling setpoint low limit1	40°F	40 to 115° F
Heating setpoint high limit 1	105 °F	40 to 115° F
Cooling setpoint high limit 1	110 °F	40 to 115° F
Thumbwheel setpoint	Enable	Disable or enable

1.The heating and cooling setpoint high and low limits only apply to the occupied and occupied standby setpoints and are never applied to the unoccupied setpoints.

Discharge Air Limits

Table 16: Discharge air limit ranges

	Default	Valid range

Low limit 1	38 °F	30 to 50°F
Control point high limit2	150 °F	38 to 150°F
Control point low limit2	45 °F	35 to 150°F

1.The low limit is the temperature at which the controller shuts down the unit to prevent the coil from freezing.

2.The control algorithm is limited to calculating this discharge air temperature based on capacity request.

Freeze Avoidance

Table 17: Freeze avoidance setpoint range

	Default	Valid range

Freeze avoidance setpoint1	40 °F	20 to 60° F

The controller disables freeze avoidance when the outdoor air temperature rises 3 °F above the freeze avoidance setpoint.

36	UV-SVP01A-EN

Image 33

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 FeaturesController Features ServiceTypical Components Communication Configurations Peer-to-Peer CommunicationsIntegrated Comfort System Stand-Alone Communication InterfaceInteroperability Characteristic End Device SpecificationsStandard End Devices DescriptionStandard 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 Configurable parameters ConfigurationCooling source Heating sourceBinary Outputs1 Binary Inputs1 Binary input summary ConfigurationAnalog Inputs1 Analog input summaryEnd Device Configurations Fan ConfigurationFan configuration ranges DefaultDischarge air limit ranges Default Valid range Setpoint defaults Default Valid rangeSetpoints Discharge Air LimitsOccupied Bypass Timer Power-Up Control WaitMaintenance Timers Location Identifier Unit Identification TagWinking Unit Operation Power-UpHeating And Cooling Changeover Logic OccupancyHeat/Cool Changeover logic Cooling Operation Fan Off DelayHeating Operation Fan OperationFace-and-Bypass Damper Operation Valve OperationExhaust fan/damper operation Modulating ValvesWater assumption chart Entering Water Temperature SamplingUnit Configuration Temperature Assumed1DX Operation Economizer OperationElectric Heat Operation Baseboard Heat OperationOutput Overrides Filter Status/ Maintenance TimerFan Status Other ModesSimple 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 Red Service LED TroubleshootingBlack Service Push Button Yellow Comm LEDExit6 Test ProcedureTroubleshooting Entering Water Temperature Failure Space Temperature FailureDischarge Air Temperature Limit Outdoor Air Temperature FailureDiagnostics Troubleshooting Translating Multiple Diagnostics Fans Rover service toolValves 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 Probable Cause Explanation Outdoor air damper stays openReplacing Circuit Boards Tracer ZN.520 Unit Controller ReplacementFan Switch Resistance Values Hardwired Setpoint AdjustmentHardwired Thermistor Values AppendixBinary Configuration Appendix-Binary ConfigurationBinary configuration details Binary input or output FunctionEffective heat/ cool mode output nvoHeatCool Heat/cool mode input NviHeatCoolAppendix-Unit Operation Unit Operation Based On The Effective HEAT/COOL OutputAppendix-Unit Operation Appendix-Data Lists Configuration properties1Data Lists Input/output listing1Appendix-Timeclock Setting the Time ClockSet the Time and Day Set the ProgramOverride Program Manual Operation Review and Change ProgramsAppendix-Timeclock Appendix-Location Identifier Location Identifier Location Identifier Location Identifier Trane Company