Trane CNT-SVX07C-EN Manuel d'utilisateur Page 1

CNT-SVX07C-ENInstallation and OperationTracer™ ZN521Zone Controller

Contentsiv CNT-SVX07C-ENChapter 7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Index . . . . . . . . . . . . . . . . . .

CNT-SVX07C-EN 1Chapter 1Overview and specificationsThis guide provides installation and configuration information for the Tracer ZN521 zone controller

Chapter 1 Overview and specifications2 CNT-SVX07C-ENStorage environmentIf a Tracer ZN521 zone controller is to be stored for a substantial amount of t

ClearancesCNT-SVX07C-EN 3Figure 1. Plastic-cover model dimensions and clearancesFigure 2. Metal-cover model dimensions and clearances4 in.(102 mm)5.62

Chapter 1 Overview and specifications4 CNT-SVX07C-ENAgency listing/complianceCE—Immunity: EN 50082-1:1997; EN 50082-2:1995CE—Emissions: EN 50081-1:199

Additional componentsCNT-SVX07C-EN 5returns the valve to normally open or closed (dependent on the desired default position). For modulating valve con

Chapter 1 Overview and specifications6 CNT-SVX07C-EN

CNT-SVX07C-EN 7Chapter 2General wiring informationThis chapter provides specifications and general information about wir-ing the Tracer ZN521 zone con

Chapter 2 General wiring information8 CNT-SVX07C-ENCAUTIONComplete input/output wiring before applying power to the Tracer ZN521 zone controller. Fail

Communication-link wiring and addressingCNT-SVX07C-EN 9Communication-link wiring and addressingThe Tracer ZN521 zone controller communicates with the

Chapter 2 General wiring information10 CNT-SVX07C-EN

CNT-SVX07C-EN 11Chapter 3Mounting the controllerThis chapter gives recommendations and requirements for mounting a Tracer ZN521 zone controller.Locati

Chapter 3 Mounting the controller12 CNT-SVX07C-ENMounting recommendationsMounting recommendations are as follows:CAUTIONMount the Tracer ZN521 zone co

CNT-SVX07C-EN 13Chapter 4Input/output functions and wiring for typical applicationsThis chapter provides information about the function of inputs and

Chapter 4 Input/output functions and wiring for typical applications14 CNT-SVX07C-ENBinary inputsThe Tracer ZN521 controller includes four binary inpu

Binary inputsCNT-SVX07C-EN 15BI3: Occupancy or generic binary inputThe BI3 binary input can function as either:• The occupancy input• A generic binary

Chapter 4 Input/output functions and wiring for typical applications16 CNT-SVX07C-ENAnalog inputsThe Tracer ZN521 controller includes seven analog inp

Analog inputsCNT-SVX07C-EN 17SET: Local setpointThe SET analog input functions as the local (hard-wired) temperature setpoint input for applications u

Chapter 4 Input/output functions and wiring for typical applications18 CNT-SVX07C-ENFor units not configured as changeover units, the entering water t

Analog inputsCNT-SVX07C-EN 19Economizing (free cooling) is a function whereby outdoor air is used as a source of cooling before hydronic or DX cooling

Installation and OperationTracer™ ZN521 Zone ControllerCNT-SVX07C-ENApril 2005

Chapter 4 Input/output functions and wiring for typical applications20 CNT-SVX07C-ENis established and then is no longer present, the controller gener

Binary outputsCNT-SVX07C-EN 21Binary outputsThe ZN521 zone controller supports fan coil, blower coil, and unit ventila-tor applications that may inclu

Chapter 4 Input/output functions and wiring for typical applications22 CNT-SVX07C-ENOverriding binary outputsThe Tracer ZN521 controller includes a ma

Wiring requirements and optionsCNT-SVX07C-EN 23Figure 7. Two-pipe hydronic-cooling unit LonTalkinEntering water temperatureOutdoor air or generic temp

Chapter 4 Input/output functions and wiring for typical applications24 CNT-SVX07C-ENFigure 8. Two-pipe hydronic-heating unit inEntering water temperat

Wiring requirements and optionsCNT-SVX07C-EN 25Figure 9. Two-pipe hydronic heating/cooling unit with auto changeover LonTalkEntering water temperature

Chapter 4 Input/output functions and wiring for typical applications26 CNT-SVX07C-ENFigure 10. Four-pipe hydronic heating/cooling unit LonTalkinEnteri

Wiring requirements and optionsCNT-SVX07C-EN 27Figure 11. Four-pipe heating/cooling unit with auto changeover LonTalkinOutdoor air or generic temperat

Chapter 4 Input/output functions and wiring for typical applications28 CNT-SVX07C-ENFigure 12. Two-pipe heating unit with DX coolingLEDA BBAAI4+20 GND

Wiring requirements and optionsCNT-SVX07C-EN 29Figure 13. Electric heat unit with DX cooling LEDA BBAAI4+20 GNDAI2 AI3FAN GND AI1ZNGNDLEDSETPINZONE SE

CNT-SVX07C-EN

Chapter 4 Input/output functions and wiring for typical applications30 CNT-SVX07C-ENFigure 14. Electric heat unit LonTalkinEntering water temperatureO

Wiring requirements and optionsCNT-SVX07C-EN 31Figure 15. Two-pipe heating unit with face-and-bypass damper LonTalkinEntering water temperatureOutdoor

Chapter 4 Input/output functions and wiring for typical applications32 CNT-SVX07C-ENFigure 16. Two-pipe heating/cooling unit with face-and-bypass damp

Wiring requirements and optionsCNT-SVX07C-EN 33Figure 17. Four-pipe heating/cooling unit with face-and-bypass damper LonTalkinEntering water temperatu

Chapter 4 Input/output functions and wiring for typical applications34 CNT-SVX07C-EN

CNT-SVX07C-EN 35Chapter 5Sequence of operationsThe Tracer ZN521 zone controller will operate to maintain the zone tem-perature setpoint. This chapter

Chapter 5 Sequence of operations36 CNT-SVX07C-ENOccupancy modesOccupancy modes can be controlled by any of the following:• The state of the local (har

Timed override controlCNT-SVX07C-EN 37The fan will run as configured (continuous or cycling) for occupied mode. The controller always uses the stored

Chapter 5 Sequence of operations38 CNT-SVX07C-ENZone temperature controlThe Tracer ZN521 zone controller uses two methods of zone temperature control:

Discharge air temperingCNT-SVX07C-EN 39Discharge air temperingIf the controller is in cooling mode, cascade zone control initiates a dis-charge air te

CNT-SVX07C-ENTracer ZN521 Zone Controller Installation and OperationThis guide and the information in it are the property of American Standard Inc. an

Chapter 5 Sequence of operations40 CNT-SVX07C-ENIn heating and cooling mode, the controller maintains the zone tempera-ture based on the active heatin

Exhaust controlCNT-SVX07C-EN 41fan configuration. The controller can be configured to auto, to a specific fan speed, or to off. If both a communicated

Chapter 5 Sequence of operations42 CNT-SVX07C-EN• The exhaust output is de-energized if the outdoor air damper position drops 10% below the Exhaust Fa

Modulating outdoor/return air dampersCNT-SVX07C-EN 43Two-position valve operationThe Tracer ZN521 supports two-position valves with a single binary ou

Chapter 5 Sequence of operations44 CNT-SVX07C-ENlow-speed fan operation. A controller can also receive a BAS-communi-cated outdoor air damper minimum

Modulating outdoor/return air dampersCNT-SVX07C-EN 45ASHRAE Cycle 1 conformanceTracer ZN521 applications with an outside air damper support ASHRAE Cyc

Chapter 5 Sequence of operations46 CNT-SVX07C-ENTwo-position control of a modulating outdoor air damper The Tracer ZN521 does not support a two-positi

Electric heat operationCNT-SVX07C-EN 47Electric heat operationThe Tracer ZN521 supports both single-stage and two-stage electric heat. Electric heat i

Chapter 5 Sequence of operations48 CNT-SVX07C-ENPeer-to-peer communicationTracer ZN521 zone controllers have the ability to share data with other LonT

Unit protection strategiesCNT-SVX07C-EN 49Smart resetThe Tracer ZN521 will automatically restart a unit that is locked-out as a result of a Low Coil T

CNT-SVX07C-ENNOTICE:Warnings and Cautions appear at appropriate sections throughout this manual. Read these carefully:WARNINGIndicates a potentially

Chapter 5 Sequence of operations50 CNT-SVX07C-ENFilter-maintenance timerThe filter-maintenance timer tracks the amount of time (in hours) that the fan

CNT-SVX07C-EN 51Chapter 6Status indicators for operation and communicationThis chapter describes the operation and communication status indica-tors on

Chapter 6 Status indicators for operation and communication52 CNT-SVX07C-ENManual output testThe manual output test sequentially turns on and off all

Manual output testCNT-SVX07C-EN 53Table 11. Manual output test sequence for non-face-and-bypass configurationsStep Result BOP1 BOP2 BOP3 BOP4 BOP5 BOP

Chapter 6 Status indicators for operation and communication54 CNT-SVX07C-EN11 : E x i t51The controller turns off all fan and electric heat outputs a

Manual output testCNT-SVX07C-EN 55Table 12. Manual output test sequence for face-and-bypass configurations (two-position isolation valves only)Step Re

Chapter 6 Status indicators for operation and communication56 CNT-SVX07C-ENService pin buttonThe Service pin button is located as shown in Figure 19 o

Interpreting LEDsCNT-SVX07C-EN 57The green (status) LED on the Tracer ZN521 controller (see Figure 19 on page 51) indicates whether the controller has

Chapter 6 Status indicators for operation and communication58 CNT-SVX07C-ENDiagnostics Diagnostics are informational messages that indicate the operat

DiagnosticsCNT-SVX07C-EN 59Smart reset diagnosticsAfter the controller detects the first smart reset diagnostic, the unit waits 30 minutes before init

CNT-SVX07C-EN iContentsChapter 1 Overview and specifications . . . . . . . . . . . . . . . . . . 1Product description . . . . . . . . . . . . . . . .

Chapter 6 Status indicators for operation and communication60 CNT-SVX07C-ENSpace Temperature Failure Invalid or missing value for zone temperatureFan

DiagnosticsCNT-SVX07C-EN 61Generic AIP Failure Invalid or missing value for generic analog inputFan unaffectedValves unaffectedOutdoor air damper unaf

Chapter 6 Status indicators for operation and communication62 CNT-SVX07C-EN

CNT-SVX07C-EN 63Chapter 7TroubleshootingUse Table 17 through Table 22 to assist you in diagnosing any of the fol-lowing operational problems that you

Chapter 7 Troubleshooting64 CNT-SVX07C-ENCycling fan operation/continuousThe controller operates the fan continuously when in the occupied, occupied s

TroubleshootingCNT-SVX07C-EN 65Table 19. Valves remain openProbable cause ExplanationUnit wiring The wiring between the controller outputs and the val

Chapter 7 Troubleshooting66 CNT-SVX07C-ENRequested mode off You can communicate a desired operating mode (such as off, heat, and cool) to the con-trol

TroubleshootingCNT-SVX07C-EN 67Normal operationThe controller opens and closes the outdoor air damper based on the controller’s occu-pancy mode and fa

Chapter 7 Troubleshooting68 CNT-SVX07C-EN

CNT-SVX07C-EN 39IndexNumerics24 Vac wiring, 7AAC-power wiring, 7ActuatorsDamper, 5, 46Valve, 4Additional application-dependent components, 4–5Addressi

Contentsii CNT-SVX07C-ENAnalog inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16GND: Ground term

Index40 CNT-SVX07C-ENElectric heat, 1Face-and-bypass dampers, 1Outdoor/return air dampers, 1Rover service tool, 1Tri-state modulating dampers, 1Tri-s

IndexCNT-SVX07C-EN 41Low-coil-temperature detectionDiagnostic, 14, 59Input, 14MManual output test, 52Modulating outdoor/return air dampers, 43Modulati

Index42 CNT-SVX07C-ENSwitching devicesCondensate overflow, 4, 14Current sensing, 4Fan status, 4Freeze protection, 4, 14Low-coil-temperature, 4Occupan

Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. Only

ContentsCNT-SVX07C-EN iiiModulating outdoor/return air dampers. . . . . . . . . . . . . . . . . . . . . . . . . 43ASHRAE Cycle 1 conformance . . . .