Trane BCVC Tracer Dehumidification Tracer ZN520 Only, Data Sharing Tracer ZN510 or ZN520 Only

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Start-Up

temperature rises 5°F above the economizer enable point, the controller disables economizing and moves the fresh air damper back to its predetermined minimum position based on the current occupancy mode or communicated minimum damper position.

Table 26. Relationship between outdoor temperature sensors and economizer damper position (Tracer ZN520 only)

 

Modulating fresh air damper

 

 

Outdoor air temperature

occupied or occupied bypass Occupied standby

Unoccupied

 

 

 

 

None or invalid

Open to occupied minimum

Open to occupied standby minimum

Closed

 

position

position

 

 

 

 

 

Failed

Open to occupied minimum

Open to occupied standby

Closed

 

position

 

 

 

 

 

 

Present and economizer

Economizing: minimum position

Economizing: between occupied

Open and economizing only when

feasible

to 100%

standby minimum position to 100%

unit operating, closed otherwise

 

 

 

 

Present and economizer not

Open to occupied minimum

Open to occupied standby minimum

Closed

feasible

position

position

 

 

 

 

 

Tracer Dehumidification (Tracer ZN520 Only)

Dehumidification is possible when mechanical cooling is available, the heating capacity is located in the reheat position, and the space relative humidity setpoint is valid.The controller starts dehumidifying the space when the space humidity exceeds the humidity setpoint. The controller continues to dehumidify until the sensed humidity falls below the setpoint minus the relative humidity offset. The controller uses the cooling and reheat capacities simultaneously to dehumidify the space. While dehumidifying, the discharge air temperature is controlled to maintain the space temperature at the current setpoint.

A typical scenario involves high humidity and high temperature load of the space. The controller sets the cooling capacity to 100% and uses the reheat capacity to warm the discharge air to maintain space temperature control. Dehumidification may be disabled via Tracer™ or configuration.

Note: If the unit is in the unoccupied mode, the dehumidification routine will not operate.

Data Sharing (Tracer ZN510 or ZN520 Only)

Because this controller utilizes LonWorks® technology, the controller can send or receive data (setpoint, heat/cool mode, fan request, space temperature, etc.) to and from other controllers on the communication link, with or without the existence of a building automation system. This applies to applications where multiple unit controllers share a single space temperature sensor (for rooms with multiple units but only one zone sensor) for both standalone (with communication wiring between units) and building automation system applications. For this application you will need to use the Rover™ service tool. For more information on setup, refer to the Trane publication EMTX-IOP-2.

Binary Inputs

Tracer™ ZN controllers have the following binary inputs, factory-configured for the following functions:

Binary input 1: low temperature detection (freezestat)

Binary input 2: condensate overflow

Binary input 3: occupancy/ generic

Binary input 4: fan status (Tracer ZN520 only)

Note: The generic binary input can be used with a Tracer Summit® building automation system only.

BIP1: Low Temperature Detection Option

The factory hard wires the low temperature detection sensor to binary input #1 (BIP1) on the Tracer™ ZN controller. The sensor defaults normally closed (N.C.), and will trip off the unit on a low

BCXC-SVX01B-EN

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Contents April Blower Coil Air HandlerRefrigerant warning information Environmental ConcernsResponsible Refrigerant Practices Hazard of Explosion and Deadly Gases Trademarks About This ManualTable of Contents BCXC-SVX01B-EN Digits 1, 2, 3, 4 Unit Model Digit 16 Motor HorsepowerDigits 5, 6, 7 Unit Size Digit 8 Unit VoltageModel Number Description Blower Coil General Information General InformationGeneral Information Pre-Installation Receiving and HandlingJobsite Storage Recommendations Service Access Installation PreparationPre-Installation Unit size Dimension aRigging and Handling Unit Handling ProcedureImproper Unit Lift Unit Location RecommendationsSkid Removal Pre-Installation ChecklistHorizontal blower coil dimensions in. and weights lb Dimensions and WeightsUnit Size RH LH Weight Horizontal Blower CoilVertical blower coil dimensions in. and weights lb Dimensions and WeightsUnit Size Weight Vertical Blower CoilAngle filter and mixing box dimensions in. and weights lb Angle Filter and Mixing BoxUnit size AIR Flow Filter Filter Access Panel Bottom or Top Access Filter BoxElectric Heat Electric heat dimensions in. and weights lbSteam Coil Steam coil box dimensions in. and weights lbCoil Connections, NPT Supply ReturnHydronic coil connection sizes, OD Coil ConnectionsDX coil connection sizes, OD Steam coil connection sizes, female connection, NPTBasic Piping Piping PackagesDimensions and Weights Deluxe Piping Actual size Piping NominalInstalling Wall Mounted Controls Installation ControlsZone Sensor Installation Wiring InstructionsInstallation Controls Communication WiringService Communication Wiring Zone Sensors Without Interconnecting WiringTracer Summit Communication Wiring Installation Electrical Zone sensor maximum wiring distances, ft m Installation ElectricalWire size range Max. wiring distance Electrical Grounding Restrictions Hazardous VoltageUseful Formulas Available electric heat, min-max kWUnit size Voltage Motor electrical data 240/50/1 220/50/1190/50/3 380/50/3Installing the Unit Installation MechanicalBchc Installation Procedure Horizontal Units, Model BchcVertical Units, Model Bcvc Installation MechanicalMixing Box Option Heating Coil OptionMixing Box Installation Procedure Linkage Installation ProcedureCondensate Drain Connections Duct Connections Recommended drain trap installation for draw-through unitsWater Coil Connections Installation PipingPotential coil-freeze condition Refrigerant Coil PipingInstallation Piping Valve DamageSuction Line Field-installed evaporation piping example Field-Installing Evaporator PipingCoil Condensate Steam PipingGeneral Steam CoilsType NS steam coils, horizontal tubes for horizontal airflow Controls Interface Control OptionsTracer Controllers Controls Interface Rover Service SoftwareTracer controller input/output summary Tracer controller ZN010 ZN510 ZN520Tracer controller function summary End Device Option AvailabilityTracer Control Device ZN010 Tracer ZN510 Tracer ZN520 Pre-Start Pre-Start ChecklistReceiving Unit LocationDuctwork Pre-Start Component OverviewUnit Piping ElectricalStart-Up Sequence of OperationTracer ZN Controller Sequence of Operation Unoccupied Mode Occupied ModeSensor type Sensor position Unit occupancy mode Start-UpOccupied Standby Mode Tracer ZN510 or ZN520 only Cooling OperationOccupied Bypass Mode, Tracer ZN510 or ZN520 Only DX Cooling Tracer ZN520 only Start-Up Economizer Cooling Tracer ZN520 OnlyDischarge Air Tempering Tracer ZN520 Only Heating OperationTracer ZN520 fan configuration Fan Mode Operation Rotating ComponentsAuto fan operation Fan speed default Fan sequence of operationTracer ZN010 and ZN510 Fan Speed SwitchTracer ZN520 Continuous Fan OperationFan mode operation, Tracer ZN010 and ZN510 Fan Off DelayStart-Up Fan Cycling Operation Fan Start on High SpeedLocal fan switch enabled Entering Water Temperature Sampling FunctionTwo- and Four-Pipe Changeover Operation Fan operation in heating and cooling modesUnit type EWT sensor required? Coil water temperature Unit mode as related to water temperatureElectric Heat Operation Economizer Damper Tracer ZN520 OnlyTracer Dehumidification Tracer ZN520 Only BIP1 Low Temperature Detection OptionData Sharing Tracer ZN510 or ZN520 Only Binary InputsBIP2 Condensate Overflow Detection Option Binary input configurationsBIP3 Occupancy Sensor BIP4 Fan Status ZN520 OnlyBinary Outputs Analog InputsAnalog inputs Analog input Terminal Function Range ZN010 ZN510 ZN520Binary output configuration Space Temperature MeasurementZone sensor wiring connections Zone SensorExternal Setpoint Adjustment Fan Mode SwitchFan Switch Local SetpointCommunication Jack On/Cancel ButtonsMaintenance Procedures MaintenanceFan Assembly Set Screws MaintenanceFan Belt Tension Torque in.-lb Ft-lbBCBH/BCVC valve package waterflow limits Belt tensionBCHC/BCVC coil general data Hydronic coil dataRow coil Steam coil data Drive data Unit Motor Motor sheave Fan sheave Belt1750 1450 Size Watts Browning Trane 60 Hz 50 Hz Potential unit damage from coil cleaners Coil MaintenanceInspecting and Cleaning Coils Steam, Hot Water, and Cooling Coil Cleaning ProcedureRotating parts Periodic Maintenance ChecklistsMaintenance Diagnostics TroubleshootingLED Activity Diagnostics Manual Output Test ProcedureManual Output Test Translating Multiple Diagnostics DiagnosticsTracer ZN520 test sequence Fan Cool output a Heat output Damper Steps J1-1, J1-3Automatic Reset by the Controller Resetting DiagnosticsCycling Power Diagnostics Manual Output TestRover Service Tool Diagnostic Reset Tracer ZN510 or ZN520 OnlyTracer ZN520 diagnostics Tracer ZN010 and ZN510 controller diagnosticsDiagnostic Latching Fan Valves Electric heat Damper Diagnostic Fan Other outputsaFan outputs do not energize Common DiagnosticsValves stay closed Probably cause ExplanationValves stay open Electric heat not operatingFresh air damper stays closed DX or electric outputs do not energize Fresh air damper stays openTwo-Pipe Bcxc with Tracer ZN510 Wiring DiagramsFour-Pipe Bcxc with Tracer ZN510 Wiring DiagramsFour-Pipe Bcxc with Tracer ZN510 Two-Pipe Bcxc with Tracer ZN520 Four-Pipe Bcxc with Tracer ZN520 Four-Pipe Bcxc with Tracer ZN520 Four-Pipe Bcxc with Tracer ZN520 Four-Pipe Bcxc with Control Interface Four-Pipe Bcxc with Control Interface Bcxc with DX Coil and Tracer ZN520 Field Installed DeviceBcxc with DX Coil, Hydronic Heating, and Tracer ZN520 BCXC-SVX01B-EN