Overview and specifications | Trane CNT-SVX07C-EN, Zone Controller

Chapter 1

Overview and specifications

This guide provides installation and configuration information for the Tracer ZN521 zone controller, as well as a description of its operations. The overview includes a product description, specifications, and descrip- tions of ancillary products that may be necessary.

Product description

The Tracer ZN521 is an application-specific controller that provides direct-digital zone temperature control. The controller can operate as a stand-alone device or as part of a building automation system (BAS). Communication between the controller and a BAS occurs by means of a LonTalk communication link, which complies with the LonTalk protocol.

The Tracer ZN521 supports the following equipment:

•Fan coils

•Unit ventilators

•Blower coils

The Tracer ZN521 can be configured to control:

•Tri-state modulating or two-position valves

•Tri-state modulating dampers: outdoor/return air, and face-and-bypass

•DX cooling (single stage)

•Electric heat (two stages)

It is designed to be field-installed and is sent from the factory unconfig- ured. Use the PC-based Rover service tool to configure the controller for specific applications

Note:

For information about using the Rover service tool, see the Rover Installation/Operation/Programming guide (EMTX- SVX01A-EN).

CNT-SVX07C-EN

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Trane CNT-SVX07C-EN, Zone Controller, N512 manual Overview and specifications, Product description

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 specifications Clearances DimensionsStorage environment Plastic-cover model dimensions and clearances Additional components Agency listing/compliance CO2 sensor Tracer zone temperature sensor optionsDamper actuators Zone humidity sensor Overview and specifications AC-power wiring Input/output terminal wiring General wiring information Communication-link wiring and addressing General wiring information Operating environment requirements Location recommendations Mounting the Tracer ZN521 zone controller Mounting recommendations HeatElectric Typical applications for the Tracer ZN521 zone controllerApplication SpeedfanMultiple Dehumidification ControlValve Economizing Binary inputs BI1 Low-coil-temperature detectionBinary inputs BI2 Condensate overflow BI4 Fan status BI3 Occupancy or generic binary input Analog inputs ZN Zone temperatureAnalog inputs GND Ground terminals SET Local setpoint FAN Fan mode inputAI1 Entering water temperature AI3 Outdoor air temperature or generic temperature AI2 Discharge air temperature AI4 Universal 4-20 mA AI4 configuration options and associated measurement rangesConfiguration Measurement range AI4 terminal wiring CO2 measurement Binary output Functions Binary outputsGeneric binary output Binary output functions Function Input source For more information See Wiring requirements and optionsOverriding binary outputs Required controller inputs for proper operation Two-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 sequence Occupancy modes Occupied modeUnoccupied mode Occupied standby mode Timed override control Occupied bypass mode Simplified zone control Zone temperature controlCascade zone control Morning cool-down Heating or cooling modeDischarge air tempering Morning warm-up Fan operation Entering water temperature sampling function Exhaust control Exhaust control Valve control options Valve operationModulating valve operation Modulating valve calibration Two-pipe operation Modulating outdoor/return air dampersTwo-position valve operation Isolation-valve operation Modulating outdoor air damper position Economizing free cooling Ashrae Cycle 1 conformanceAshrae Cycle 2 conformance Face-and-bypass, isolation-valve operation Two-position control of a modulating outdoor air damperFace-and-bypass damper operation DX cooling operation Dehumidification Electric heat operationBaseboard heat operation Unit protection strategies Peer-to-peer communication Condensate overflow Smart resetLow-coil-temperature protection Fan off delay Freeze avoidance Filter-maintenance timerFreeze protection discharge air temperature low limit Tracer ZN521 zone controller circuit board Test button Manual output test Output For non Close damper, air Outdoor Open damper, air Outdoor BOP1 BOP2 BOP3 BOP4 BOP5 BOP6 BOP7 BOP8 BOP9 Step Result LED activity Explanation Service pin buttonRed LED Service indicator Interpreting LEDs Yellow LED Communications indicator Green LED Status indicator Types of diagnostics Diagnostics Fan unaffected Table of diagnosticsDiagnostics Diagnostic Probable cause Consequences Type Position Valved unaffected Damper unaffected Status indicators for operation and communication Probable cause Explanation Fan does not energize Valves remain closed Troubleshooting DX or electric heat does not energize Valves remain open Outdoor air damper remains open Outdoor air damper remains closed Outdoor air damper remains open Troubleshooting Numerics Index Index Index Index Page Trane