Trane CNT-SVX07C-EN, Zone Controller, N512 manual Input/output terminal wiring, AC-power wiring

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Chapter 2

General wiring information

This chapter provides specifications and general information about wir- ing the Tracer ZN521 zone controller. The controller requires wiring for:

•Input/output terminals

•AC power to the controller

•Communication-link wiring, if the controller is to communicate with a building automation system (BAS)

Input/output terminal wiring

All input/output terminal wiring for the Tracer ZN521 zone controller is application specific and dependant on the configuration of the controller. Input/output terminal wiring must meet the following requirements:

•All wiring must comply with the National Electrical Code and local codes.

•Use only 18 AWG, twisted-pair wire with stranded, tinned-copper conductors. (Shielded wire is recommended.)

•Binary input and output wiring must not exceed 1000 ft (300 m).

•Analog input wiring must not exceed 300 ft (100 m).

•Do not run input/output wires in the same wire bundle with any ac- power wires.

For application-specific wiring information and diagrams, see Chapter 4, “Input/output functions and wiring for typical applications”

AC-power wiring

WARNING

HAZARDOUS VOLTAGE!

Before making line voltage electrical connections, lock open the supply- power disconnect switch. Failure to do so may cause death or serious injury.

CAUTION

Make sure that the 24 Vac transformer is properly grounded. Failure to do so may result in damage to equipment and/or personal injury.

CNT-SVX07C-EN

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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 specificationsClearances DimensionsStorage environment Plastic-cover model dimensions and clearances Additional components Agency listing/complianceDamper actuators Tracer zone temperature sensor optionsZone humidity sensor CO2 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 recommendationsApplication SpeedfanMultiple Dehumidification Typical applications for the Tracer ZN521 zone controllerControlValve Economizing HeatElectricBinary inputs BI1 Low-coil-temperature detectionBI2 Condensate overflow Binary inputsBI4 Fan status BI3 Occupancy or generic binary inputAnalog inputs ZN Zone temperatureGND Ground terminals Analog inputsSET Local setpoint FAN Fan mode inputAI1 Entering water temperature AI3 Outdoor air temperature or generic temperature AI2 Discharge air temperatureAI4 Universal 4-20 mA AI4 configuration options and associated measurement rangesConfiguration Measurement range AI4 terminal wiring CO2 measurement Generic binary output Binary outputsBinary output functions Binary output FunctionsOverriding binary outputs Wiring requirements and optionsRequired controller inputs for proper operation Function Input source For more information SeeTwo-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 sequenceUnoccupied mode Occupied modeOccupied standby mode Occupancy modesTimed override control Occupied bypass modeSimplified zone control Zone temperature controlCascade zone control Discharge air tempering Heating or cooling modeMorning warm-up Morning cool-downFan operation Entering water temperature sampling functionExhaust control Exhaust controlModulating valve operation Valve operationModulating valve calibration Valve control optionsTwo-position valve operation Modulating outdoor/return air dampersIsolation-valve operation Two-pipe operationModulating outdoor air damper position Economizing free cooling Ashrae Cycle 1 conformanceAshrae Cycle 2 conformance Face-and-bypass damper operation Two-position control of a modulating outdoor air damperDX cooling operation Face-and-bypass, isolation-valve operationDehumidification Electric heat operationBaseboard heat operation Unit protection strategies Peer-to-peer communicationLow-coil-temperature protection Smart resetFan off delay Condensate overflowFreeze avoidance Filter-maintenance timerFreeze protection discharge air temperature low limit 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 ResultRed LED Service indicator Service pin buttonInterpreting LEDs LED activity ExplanationYellow LED Communications indicator Green LED Status indicatorTypes of diagnostics DiagnosticsDiagnostics Table of diagnosticsDiagnostic Probable cause Consequences Type Fan unaffectedPosition 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