Trane N512, Zone Controller manual Binary outputs, Generic binary output, Binary output functions

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Binary outputs

Binary outputs

The ZN521 zone controller supports fan coil, blower coil, and unit ventila- tor applications that may include the following components:

•Supply fan with up to three speeds

•Hydronic cooling and/or heating coils with two-position or tri-state modulating control valve

•DX cooling (single stage)

•Electric heat (single stage or two stage)

•Baseboard heat (single stage)

•Tri-state modulating outdoor/return air damper

•Tri-state modulating face-and-bypass damper

The Tracer ZN521 controller includes ten binary outputs. Each binary output is a triac with a rating of 12 VA at 24 Vac. Table 6 describes the function of each output.

Table 6: Binary output functions

Binary output	Functions

1	• Fan high

2	• Fan medium
	• Exhaust fan or damper

3	• Fan low

4	• Modulating cooling/changeover valve, open
	• Two-position cooling/changeover valve
	• DX cooling

5	• Modulating cooling/changeover valve, close
	• Face-and-bypass damper, open to face

6	• Modulating heating valve, open
	• Two-position heating valve
	• Electric heat, stage 1

7	• Modulating heating valve, close
	• Face-and-bypass damper, close (bypass)
	• Electric heat, stage 2

8	• Outdoor air damper, open (return air damper, close)

9	• Outdoor air damper, close (return air damper, open)

10	• Baseboard heat
	• Generic

Generic binary output

Binary output 10 is the only output that can be configured as a generic binary output. When configured as a generic binary output, it can be con- trolled only by a BAS, and has no direct effect on Tracer ZN521 operation.

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Contents Installation and Operation Tracer ZN521 Zone Controller Page CNT-SVX07C-EN April CNT-SVX07C-EN Tracer ZN521 Zone Controller Installation and Operation CNT-SVX07C-EN Contents Sequence of operations Status indicators for operation and communication Troubleshooting Index Product description Overview and specificationsStorage environment DimensionsClearances Plastic-cover model dimensions and clearances Additional components Agency listing/complianceCO2 sensor Tracer zone temperature sensor optionsDamper actuators Zone humidity sensorOverview and specifications AC-power wiring Input/output terminal wiringGeneral wiring information Communication-link wiring and addressing General wiring information Operating environment requirements Location recommendationsMounting the Tracer ZN521 zone controller Mounting recommendationsHeatElectric Typical applications for the Tracer ZN521 zone controllerApplication SpeedfanMultiple Dehumidification ControlValve EconomizingBinary inputs BI1 Low-coil-temperature detectionBinary inputs BI2 Condensate overflowBI4 Fan status BI3 Occupancy or generic binary inputAnalog inputs ZN Zone temperatureAnalog inputs GND Ground terminalsAI1 Entering water temperature FAN Fan mode inputSET Local setpoint AI3 Outdoor air temperature or generic temperature AI2 Discharge air temperatureConfiguration Measurement range AI4 configuration options and associated measurement rangesAI4 Universal 4-20 mA AI4 terminal wiring CO2 measurement Binary output Functions Binary outputsGeneric binary output Binary output functionsFunction Input source For more information See Wiring requirements and optionsOverriding binary outputs Required controller inputs for proper operationTwo-pipe hydronic-cooling unit Two-pipe hydronic-heating unit Two-pipe hydronic heating/cooling unit with auto changeover Four-pipe hydronic heating/cooling unit Four-pipe heating/cooling unit with auto changeover Two-pipe heating unit with DX cooling Electric heat unit with DX cooling Electric heat unit Two-pipe heating unit with face-and-bypass damper Two-pipe heating/cooling unit with face-and-bypass damper Four-pipe heating/cooling unit with face-and-bypass damper Input/output functions and wiring for typical applications Random start Power-up sequenceOccupancy modes Occupied modeUnoccupied mode Occupied standby modeTimed override control Occupied bypass modeCascade zone control Zone temperature controlSimplified zone control Morning cool-down Heating or cooling modeDischarge air tempering Morning warm-upFan operation Entering water temperature sampling functionExhaust control Exhaust controlValve control options Valve operationModulating valve operation Modulating valve calibrationTwo-pipe operation Modulating outdoor/return air dampersTwo-position valve operation Isolation-valve operationModulating outdoor air damper position Ashrae Cycle 2 conformance Ashrae Cycle 1 conformanceEconomizing free cooling Face-and-bypass, isolation-valve operation Two-position control of a modulating outdoor air damperFace-and-bypass damper operation DX cooling operationBaseboard heat operation Electric heat operationDehumidification Unit protection strategies Peer-to-peer communicationCondensate overflow Smart resetLow-coil-temperature protection Fan off delayFreeze protection discharge air temperature low limit Filter-maintenance timerFreeze avoidance Tracer ZN521 zone controller circuit board Test buttonManual output test Output For nonClose damper, air Outdoor Open damper, air Outdoor BOP1 BOP2 BOP3 BOP4 BOP5 BOP6 BOP7 BOP8 BOP9 Step ResultLED activity Explanation Service pin buttonRed LED Service indicator Interpreting LEDsYellow LED Communications indicator Green LED Status indicatorTypes of diagnostics DiagnosticsFan unaffected Table of diagnosticsDiagnostics Diagnostic Probable cause Consequences TypePosition Valved unaffectedDamper unaffected Status indicators for operation and communication Probable cause Explanation Fan does not energizeValves remain closed TroubleshootingDX or electric heat does not energize Valves remain openOutdoor air damper remains open Outdoor air damper remains closedOutdoor air damper remains open Troubleshooting Numerics IndexIndex Index Index Page Trane