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Trane ZN.520 User's Manual

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1. Bay 4 M J e T on r i LIELIZ OU ELU OA PUT POWER SE x quz f Log Jj J 8 E r WE E J3 Je 3 J3 Sg a j3 5 2 n 1 2 da woe 2 Es O sg 3 O Aa z iz Ja 5 u Ter 13 4 l J mi c 5 n 3 ga e 8 PIT lt L Jo 7 3 Ej SERUICE p m p _ lJe 8 hie 5 r w att l LOC y COMMUNICATIUN agaaa N P ZONE SENSOR En A 35 So Sur vm n ru nu J ny nj m v e Mm O CLIBPELI l ELI O JJ J am LEnMM Lrpww cam ZONE GNI sz 7 EAN rmi Figure 7 Tracer ZN 520 circuit board schematic UV SVPO1A EN Binary Inputs Each binary input associates an in put signal of 0 VAC with open con tacts and 24 VAC with closed contacts Installation and Wiring Table 3 Binary inputs typically 24 mA AC Binary input 1 BI 1 Binary input 2 BI 2 Binary input 3 BI 3 Binary input 4 BI 4 UV SVPO1A EN Description Terminals 24 VAC Input 24 VAC Input 24 VAC Input 24 VAC Input Terminal Function 19 Installation and Wiring Binary Outputs Outputs are load side switching tri acs The triac acts as a switch ei ther making or breaking the circuit between the load valve damper contactor relay and ground Table 4 Binary outputs Description Terminals Wan Load Energized Load De energized 1 VAC RMS 24 VAC RMS Fan high J 1 1 12 VA typical typical Fan medium 1 VAC
2. Random start observed After power up the controller always observes a random start from 5 to 30 seconds The controller remains off until the random start time expires Unit configuration The controller must be properly configured based on the actual installed end devices and application When the unit configuration does not match the actual end devices the valves may not work correctly Power up control wait When power up control wait is enabled non zero time the controller remains off until one of two conditions occurs The controller exits power up control wait once it receives communicated information The controller exits power up control wait once the power up control wait time expires Diagnostic present A specific list of diagnostic affects valve operation For more information see Tracer ZN 520 Unit Controller diagnostics on page 52 for more information Manual output test The controller includes a manual output test sequence you can use to verify output operation and associated output wiring However based on the current step in the test sequence the valve s may not be open For more information see Manual Output Test on page 48 for more information Fan mode off When a local fan mode switch provided on the Trane zone sensor determines the fan operation the off position controls the unit off and valves to close Requested mode off You can communicate a desired operating
3. Tracer ZN 520 for Classroom Unit Ventilator UV SVPOIA EN Start up Procedures Installation of New Units 1 Follow all instruction for installation of classroom unit ventilators as detailed in UV IOM 1 Installation Operation Maintenance manual Disconnect power or disable the circuit breaker to unit Run communication link wire when required See wiring diagram in the unit Install zone sensor when required See wiring diagram in the unit and zone sensor submittals Reapply power Check for GREEN Status LED operation to ensure power has been made to the Tracer ZN 520 unit controller Check for YELLOW Comm LED operation to help ensure com munication has been made to the Tracer ZN 520 unit control ler when required Peel IDENTIFICATION TAG from unit and place in the Appendix of this document or on building plans for future location use The actual room location on the tag may be hand written UV SVPO1A EN TRANE e TRANE Power Up Sequence Manual output test can be initiated at any time in the power up se quence or during normal opera tion When 24 VAC power is initially ap plied to the controller the follow ing sequence occurs 1 2 3 Green Status LED turns on All outputs are controlled Off The controller reads input val ues to determine initial values Standalone control is assumed unless occupancy data is com municated Random start timer
4. Literature Order Number UV SVPO1A EN File Number SV TD UV 000 SVP01A EN 0700 Supersedes New Stocking Location La Crosse Since The Trane Company has a policy of continuous product improvement it reserves the right to change design and specifications without notice
5. TRANE Troubleshooting Table 33 Outdoor air damper stays closed Probable cause Explanation Requested mode OFF You can communicate a desired operating mode such as OFF HEAT and COOL to the controller When OFF is communicated to the controller the unit controls the fan OFF There is no heating or cooling valves are closed Freeze avoidance When the fan is OFF and the outdoor air temperature is below the freeze avoidance setpoint the controller disables economizing and keeps the outdoor air damper closed This includes UNOCCUPIED mode when there is no call for capacity or any other time the fan is OFF UNOCCUPIED mode When the controller is in the UNOCCUPIED mode the outdoor air damper remains closed unless economizing is enabled Warm up and cool down The controller includes both a morning warm up and cool down sequence to keep the outdoor air damper closed during the transition from UNOCCUPIED to OCCUPIED This is an attempt to bring the space under control as quickly as possible Normal operation The controller opens and closes the outdoor air damper based on the controller s occupancy mode and fan operation Normally the outdoor air damper is open during OCCUPIED OCCUPIED STANDBY and OCCUPIED BYPASS mode when the fan is running and closed during UNOCCUPIED mode unless the controller is economizing For more information see Modulating Outdoor Air Operation on page 43 for more
6. J 1 11 Economizer Damper Open J 1 12 Economizer Damper Close TB4 1 Generic Baseboard Heat TB4 2 24 VAC 30 UV SVPO1A EN Table 8 Input and output summary Input Output Summary Description Zone Temperature Setpoint Fan Speed Entering Water Temperature Analog Inputs Discharge Air Temperature Outdoor Air Temperature Generic Generic Humidity CO2 4 UV SVPO1A EN 20mA 31 e TRANE Note The Tracer Zn 520 unit controller only supports cascade control by controlling the discharge air temperature Therefore the controller requires both a space temperature input and a discharge air temperature input Table 9 Typical applications supported Configuration 2 pipe cooling only 2 pipe heating only 2 pipe changeover 4 pipe 4 pipe changeover 2 pipe face bypass heating only 2 pipe face bypass changeover 4 pipe face bypass DX cooling 2 pipe heating DX cooling electric heating Electric heat only 1 or 2 stage 1 Isolation valves are 2 position only Configuration Trane configures the Tracer ZN 520 Unit Controller at the fac tory per the selected unit configu ration The controller is applied classroom unit ventilator configu rations that support modulating valves 2 position valves econo mizer damper modulating only direct expansion DX cooling 1 Type of valve Modulating 2 position NA v Y vi v v NA A N Configurable para
7. Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX electric heat ENABLED Baseboard heat ENABLED Non latching Communicated or manual reset UV SVPO1A EN 53 TRANE Troubleshooting Table 28 Tracer ZN 520 Unit Controller diagnostics Latching non latching Reset Diagnostic Unit Response Fan DISABLED Valves DISABLED Outdoor air damper DISABLED Face bypass damper DISABLED DX electric heat DISABLED Baseboard heat DISABLED Invalid Unit Configuration Non latching Communicated or manual reset Fans ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX electric heat ENABLED Baseboard heat ENABLED Note The generic binary output TB4 1 TB4 2 state is unaffected by all unit diagnostics Note During manual output test these diagnostics make the green status LED light in a two blink pattern For more information see Manual Output Test on page 48 for more information Note When the entering water temperature is required but not present the Tracer ZN 520 Unit Controller generates a diagnostic to indicate the sensor loss condition The controller automatically clears the diagnostic once a valid entering water temperature value is present non latching diagnostic When the entering water temperature sensor fails the controller prohibits all hydronic cooling operation but allows the deliv
8. alone units Figure 6 Typical classroom unit ventilator installation 12 Communication Interface Important To help ensure optimal performance of the Rover service tool please use the latest version To obtain the latest version contact your local Trane sales represent tative or service technician Note Refer to the Tracer system manuals for more information on communica tions The Tracer ZN 520 communicates via Comm5 LonTalk to a building management system the Rover service tool and other unit control lers on the communications link Each Tracer ZN 520 requires a unique address for the system to operate properly Every Tracer ZN 520 has this address Neuron ID embedded in the microproces sor which eliminates the need for field addressing of the units Each unit also ships from the factory with a unit identification tag See Location Identifier on page38 for more information Building automation system Trane offers a state of the art front end building automation system designed to coordinate and moni tor Trane equipment and control lers Tracer Summit The Tracer Summit system allows the user to monitor and or change Tracer ZN 520 status parameters sensor data diagnostics and internal variables and setpoints operating modes and outputs Service tool Trane also offers a service tool to work in conjunction with the Tracer Summit system or with peer to peer and st
9. e TRANE Each Tracer ZN 520 unit controller circuit board is equipped with en hancements to help facilitate ser vice testing and diagnosis Each board has Manual test button Status LED C Communication status LED C Service button C Quick terminal connectors and C Easy to read screen printing See Figure 1 Tracer ZN 520 Control Board Controller Features Service The Trane Tracer ZN 520 unit con troller is serviced using Rovers the ICS software service too Rover is designed to support the Tracer ZN 520 unit controller on the class room unit ventilator For remote access to the com municating units the zone sensors offered with the Tracer ZN 520 have a telephone style RJ 11 con nector allowing field connection between Rover and the zone sen sor however the RJ 11 connector must be connected to the terminals TB2 5 and TB2 6 on the Tracer ZN 520 unit controller See Figure 3 Rover service tool connected to the RJ 11 communication jack in a zone sensor Figure 3 Rover service tool connected to the RJ 11 communication jack in a zone sensor Typical Components A typical classroom unit ventilator system with a DDC package con sists of the following physical com ponents in addition to the mechanical equipment Tracer ZN 520 contains the sensor input circuits service adjustments microprocessor control electronics and communications hardware 10 Powe
10. Failure If the Tracer ZN 520 has validated an outdoor air temperature input and then the input becomes in valid an outdoor air temperature failure diagnostic occurs Humidity Input Failure If the Tracer ZN 520 has validated a relative humidity input and then the input becomes invalid a hu midity input failure diagnostic oc curs CO Sensor Failure If the Tracer ZN 520 has validated a CO input and then the input be comes invalid a CO input failure diagnostic occurs Generic AIP Failure If the Tracer ZN 520 has validated a generic analog input and then the input becomes invalid a ge neric analog input failure diagnos tic occurs Defrosting Compressor Lockout The defrost stat used with Tracer ZN 520 on DX units is wired in se ries with the condensing unit When it opens to indicate a frost condition the Tracer ZN 520 sens es the open circuit and de energiz es the condensing unit output A defrosting diagnostic is generated at this point Maintenance Required Note If power to the unit is cycled or discontinued for any reason all maintenance timers are automatically reset The Maintenance Required di agnosticis generated when the fan run time exceeds the configurable limit This diagnostic is useful for filter change notification Local Fan Mode Failure If the hardwired fan mode input to the Tracer ZN 520 controller is present and then becomes invalid a local fan mode failure diagno
11. Install controller in the unit with the heat sink placement at the top of the control box See page 32 Connect the power to the cir cuit board ONLY Connect Rover and properly configure the controller unless a previously config ured board is purchased Power down Connect the remaining input and output wiring to the con troller Reapply power Complete sequence 7 and 8 above in the installation sec tion of this manual Refer to BAS manual for instructions on how to install the new ZN 520 into BAS sys tem UV SVPO1A EN 59 A ppendix Hardwired Setpoint Adjustment Table 35 Hardwired setpoint adjustment Resistance Q ee Deg F Fan Switch Resistance Values Table 36 Resistance values Resistance Q Switch Position Hardwired Thermistor Values Table 37 Hardwired 10k thermistor values Resistance Temperature Resistance Temperature 55a for sa far 60 UV SVPO1A EN A ppendix Binary Configuration Binary Configuration Table 38 Binary configuration details or output Low temp Closed BIP 1is Normal no diagnostic pda ind Open BIP 1 is Active diagnostic BI 2 Condensate N ily closed Closed BIP 2 is Normal no diagnostic overflow a EOSS Open BIP 2 is Active diagnostic Closed BIP 3is Normal Occupied PPM icd Open BIP 3 is Active Unoccupied N T Open BIP 3 is Normal Occupied Bring y open Closed BIP 3 is Active Unoccupied When the co
12. The exhaust output is energized only when the unit fan is operating and the out door damper position is greater than or equal to the configurable exhaust enable point The exhaust fan output is disabled when the outdoor air damper position drops 1096 below the exhaust enable point If the enable point is less than 1096 the unit turns on at the enable point and off at O Unit Operation Valve Operation Modulating Valves The Tracer ZN 520 controller sup ports one or two modulating valves for hydronic heating and cooling operation The main valve coil is used for cooling only heat cool changeover 2 pipe applica tions or cooling 4 pipe applica tions The auxiliary valve coil provides heating in 4 pipe and heating only applications At power up the Tracer ZN 520 controller drives the modulating valves to the closed position The controller calibrates to the full closed position by overdriving the actuator 13596 Whenever the con troller requests a valve position of zero or 10096 the controller over drives the actuator 13596 regard less of the current valve position Face and Bypass Isolation Valves Face and bypass units may use isolation valves to prevent unwant ed water flow in the coil This elim inates problems such as radiant heat or excessive condensate in 2 pipe systems In 4 pipe applications the isolation valves are used to prevent conflict ing capacities within the unit Face and By
13. Tracer ZN 520 through the Rover service tool it is important that the version be up to date To help ensure that your version is the most recent contact you local Trane sales representative or service center Led Operation Red Service LED Table 23 Red service LED activity Red LED activity Description LED is OFF continuously after power is applied to the controller LED is ON continuously even when power is first applied to the controller Normal operation Someone is pressing the Service push button or the controller has failed Un install normal controller mode Use Rover service tool to restore the unit to normal operation Refer to the Rover product literature for more information LED flashes about once every second Black Service Push Button Note If the Service push button is held down for more than 15 seconds the Tracer ZN 520 Unit Controller will un install itself from the ICS communication network and shut down all unit operation This mode is indicated by the red Service LED flashing once every second See the Red Service LED section Use Rover service tool to restore the unit to normal operation 48 Troubleshooting The Service push button located at the bottom center of the control ler can be used to install the Trac er ZN 520 Unit Controller in a communication network Refer to the Rover and Tracer Summit product literature fo
14. compressors For these units cen tral heating or cooling plan opera tion is not required for heating or cooling because they are capable of providing their own local heat ing or cooling For 2 pipe changeover and 4 pipe changeover units with hydronic ca pacity heating and cooling is pro vided through hydronic For those hydronic central heating or cool ing plant operation is required for the unit to deliver heating or cool ing To determine whether the cen tral plantis providing the desired water temperature an entering water temperature sensor either hardwired or communicated must be present UV SVPO1A EN Unit Operation TRANE The entering water must be five degrees or more above the space temperature to allow hydronic heating and five degrees or more below the space temperature to al low hydronic cooling If the desired water temperature is available the unit begins normal heating and cooling operation If the measured entering water tem perature is not adequate for the desired heating or cooling the controller begins the entering wa ter temperature sampling logic The Tracer ZN 520 Unit Control ler operates the modulating valves and dampers based on a heating or cooling capacity calculated by the control algorithm The control algorithm calculates the heating or cooling capacity based on the measured space temperature the active setpoint and the discharge air temperature When the mea
15. whenever the corresponding binary output is directed on UV SVPO1A EN The fan status is reported as oFF when none of the fan out puts are directed on 2 The Tracer ZN 520 controller has a binary input available for a fan status device current sensing relay or differential pressure switch which can provide feedback of fan opera tion If the device does not indicate fan operation after 1 minute a unit shutdown is ini tiated and the unit is latched OFF Filter Status Maintenance Timer The unit filter status maintenance timer is based on the cumulative run hours of the unit fan The con troller compares the fan run time against an adjustable fan run hour limit and recommends unit main tenance as required The Rover service tool is used to edit the maintenance required set point time Once the setpoint limit is exceeded the controller gener ates a MAINTENANCE REQUIRED infor mational diagnostic When the maintenance required setpoint time is set to zero the controller disables this feature You can use the Trace Summit or the Rover service tool to clear the MAINTENANCE REQUIRED informa tional diagnostic Once the diag nostic is cleared the controller resets the fan run time to zero and begins accumulating fan run hours again Note If at any time the unit loses power the timer is reset to zero Other Modes DEHUMIDIFICATION Note If the unit is in the unoccupied mode the dehumidification r
16. 24 VAC RMS typical 24 VAC TB4 2 1 Trane s Rover service tool uses the unit type to determine and download the proper default binary output configuration 2 The normally open closed configuration item refers to the inactive state of the controlled end device such as an 2 position cooling valve output cim o 5 o UV SVPO1A EN 33 Configuration Binary Inputs Table 11 Binary input summary Binary input Configuration Valid range Occupancy generic or not used md 1 Trane Rover service tool uses the unit type to determine and download the proper default binary input configuration Analog Inputs Table 12 Analog input summary Analog input Configuration Calibration range 10 0 F 10 0 F set feont abd 0 1 F resolution 4 NA Humidity CO2 or generic 4 20mA input 1 Trane Rover service tool uses the unit type to determine and download the proper default analog input configuration 2 Analog input 3 Al 3 configured as generic temperature input does not affect unit operation When configured the Tracer ZN 520 Unit Controller communicates the generic temperature value to Rover or Tracer Summit and displays it as generic temperature e Outdoor air temperature or generic temperature input Al3 Note 2 Al 34 UV SVPO1A EN Configuration Fan Configuration Table 13 Fan configuration ranges Fan configuration Default Valid range 2 Continuous during occupied F t heati
17. 84 33 2 1 15 ves 7 dm ash TI aS er Te m f u mp ri Y r9 1 39 2 OND MOXWIID fn snien q e ew ho 32a ki JO 5 5 Jia EL ew Cm w a s Er O AR ut met iz 2 nm a mpa j i am cos di wnat z 1 E WE j A nam l D nE di A G OR mm i lassie i UV SVPO1A EN 29 Input Output Summary Input Output Summary Mostbinary inputs and outputs are must be wired to the 1 4 quick The following lists all possible bi wired from the factory based on connect terminals provided Most nary and analog inputs and out unit configuration and options If other analog inputs will be wired puts available for the classroom the generic inputs and outputs are from the factory unit ventilator applications Some to ve ae ya See of the points listed may be mutual Made at the 1 4 quick connect ter ly exclusive and some are optional minals provided See Table 8 Input and output Analog inputs from a wall mount summary ed zone sensor humidity sensor CO sensor or a generic device Table 8 Input and output summary HJ Freezestat J 1 2 Exhaust Fan J 1 5 Cooling Open M odulating valve DX Isolation valve J 1 6 Cooling Close J 1 7 Face and Bypass Damper Open J 1 8 Face and Bypass Damper Close Binary Outputs J 1 9 Heat Open Modulating valve Isolation valve or1 Stage Electric Heat J 1 10 Heat Closeor2 Stage Electric Heat
18. Cont b vd dL icio Cycling with capacity unoccupied Continuous during occupied F t Conti j an operation in cooling ontinuous Cycling with capacity unoccupied Configurable fan speed heating Off low high auto Configurable fan speed cooling Off low high auto End Device Configurations Table 14 End device ranges TT ew TT mme Occupied standby outside air damper minimum 0 to 100 position Alternate minimum outside air damper position 40 0 to 100 for low fan speed Economizer enable temperature 55 F 30 to 70 F Exhaust fan enable setpoint 9 0 to 100 101 disables the exhaust fan Face and bypass damper stroke time 30 360 seconds 1 The exhaust fan is energized when the outdoor air damper is equal to or greater than the exhaust fan enable point and the exhaust fan is turned off when the outdoor air damper is 10 less than the exhaust fan enable point 2 Varies with unit configuration UV SVPO1A EN 35 Configuration Setpoints Table 15 Setpoint defaults Thumbwheel setpoint Disable or enable 1 The heating and cooling setpoint high and low limits only apply to the occupied and occupied standby setpoints and are never applied to the unoccupied setpoints Discharge Air Limits Table 16 Discharge air limit ranges Control point high limit 150 F 38 to 150 F Control point low limit 35 to 1507 1 The low limit is the temperature at which the controller shuts down t
19. MAINTENANCE REQUIRED informa tional diagnostic Once the diag nostic is cleared the controller resets the fan run time to zero and begins accumulating fan run hours again Note If at any time the unit loses power the timer is reset to zero Other Modes DEHUMIDIFICATION Note If the unit is in the unoccupied mode the dehumidification routine will not operate Dehumidification is possible when mechanical cooling is available the heating capacity is in the re heat position and the space rela tive humidity setpoint is valid The controller starts dehumidify ing the space when the space hu midity exceeds the humidity setpoint The controller continues to dehumidify until the sensed hu midity falls below the setpoint mi nus the relative humidity offset The controller uses the cooling and reheat coils simultaneously to dehumidify the space When de humidifying the discharge air temperature is controlled to main tain the space temperature at the current setpoint Economizing is disabled during the dehumidification mode Note While in the dehumidification mode if there is a call for capacity by the unit the zone temperature setpoint will take priority over the relative humidity setpoints DEFROST For defrost operation a sensor is wired in series with the DX cooling relay When a defrost condition is detected the condensing unit is disabled and the unit is placed in the DEFROST mode Durin
20. RMS 24 VAC RMS Exhaustfan Idee TEMA typical typical 1 VAC RMS 24 VAC RMS Fan low J 1 3 12 VA typical typical No connection J 1 4 Key Cool open face bypass cool valve J 1 5 12 VA 1VAC RMS 24 VAC RMS DX 2 position cooling valve BI 5 typical typical Cool close J16 Bw n AQ Face bypass damper open J 1 7 12 VA ie S we m S Face bypass damper close J 1 8 12 VA senena S e T S Heat open Face bypass isolation valve J 1 9 12 VA 1VAC RMS 24 VAC RMS 2 position heating valve typical typical Electric heat 1s stage Heat close 1 VAC RMS 24 VAC RMS Electric heat 2 stage J 1 10 12 VA typical typical Economizer damper open J 1 11 12 VA a DIS E 1 VAC RMS 24 VAC RMS Economizer damper close J 1 12 12 VA typical typical Generic baseboard Heat Binary Output Table 5 Generic binary outputs Description Terminals Output Load Energized Load De energized Rating Generic baseboard heat output TB4 1 12 VA 1 VAC RMS 24 VAC RMS typical typical 24VAC TB4 2 12 VA NA NA 20 UV SVPO1A EN Analog Inputs Table 6 Analog inputs Description Zone Ground Set Fan Ground Analog Input 1 Analog Input 2 Analog Input 3 Analog Input 4 UV SVPO1A EN Terminals TB3 1 TB3 2 TB3 3 TB3 4 TB3 6 J31 32 33 J3 4 3 5 3 6 33 3 8 3 9 Function Space temperature input Analog ground Setpoint input Fan switch input Analog ground Entering water temperature Analog ground Dischar
21. Rover When conducting the manual out put test via communications net work the sequence must start with Step 1 OFF as shown in Table 26 Test sequence for non face and bypass unit configurations and Table 27 Test se quence for face and bypass unit configura tions However subsequent steps may be conducted in any order DX ok cool or Face and Electric heat or Outdoor air cenare Step Fan heat cool changeover baseboard bypass damper heat valve damper valve heat J1 1 J1 2 J1 3 J1 5 J1 6 J1 7 J1 8 J1 9 J1 10 J1 11 J1 12 TB4 1 1 Off off off Off Off On NA NA ofp Ydron con of on off EH off 2 Fan high High Off Off Off Off NA NA Off Off Off Off Off 3 Fan med Off Med Off Off Off NA NA Off Off Off Off Off 4 Fan low Off Off Low Off Off NA NA Off Off Off Off Off s nopen High Off Off On Off NA NA Off Off Off Off Off 6 Main close DX off aux High Off Off Off On NA NA On Off Off Off Off open EH1 on 7 Aux open EH1 on exhaust High Exh Off Off Off NA NA On Off Off Off Off fan 8 Aux close EH1 off EH20n High Off Off Off Off NA NA Off On On Off Off damper open 9 Damper close High Off Off Off Off NA NA Off Off Off On Off 10 Generic baseboard heat High Off Off Off Off NA NA Off Off Off Off On energized 11 Exit Exit T Upon entering manual output test mode the controller turns off all fan DX and elect
22. The Tracer ZN 520 controller also allows the default fan speed to be configured as AUTO When the fan speed switch is in the AuTO posi tion and the default fan speed is configured as AUTO the unit may change fan speeds based on the requested heating or cooling ca pacity In this mode the unit fan will operate atLow speed until the requested capacity requires HIGH fan speed operation to maintain space comfort The fan mode request can be ei ther hardwired or communicated to the Tracer ZN 520 controller When both are present the com municated request has priority over the hardwired input Addi tional flexibility in the controller al lows the fan speed switch to be disabled When this occurs the unit will operate at the default fan speed unless a communicated re quest is present During OCCUPIED OCCUPIED STANDBY ahdOCCUPIED BYPASS modes the fan will normally oper ate continuously at the appropri ate fan speed The fan will only be orr in these modes when the MAN UAL OUTPUT TEST has been initiat ed a latching diagnostic is pen or the communicated or ardwired fan speed is orr See Manual Output Test on page48 for more information During the UNOCCUPIED mode the unit fan is controlled orr When ca pacity is required to maintain the unoccupied heating or cooling set point the unit fan is controlled to high speed regardless of a hard wired or communicated fan speed Table 21 Absolute two speed fan
23. a heat ing or cooling setpoint between the occupied and unoccupied set points to help maintain the envi ronment while decreasing energy consumption This mode decreases the ventila tion for heating or cooling during brief periods of vacancy in the space Unit operation in this mode is similar to the occupied mode ex cept for the different heating and cooling setpoints and a different outside air damper position The OCCUPIED STANDBY modeis initiated only when occupancy is communicated to the Tracer ZN 520 controller and the hard wired signal to the occupancy in put is calling for unoccupied operation OCCUPIED BYPASS mode The OCCUPIED BYPASS mode is used to transition the unit from the UNOCCUPIED mode to the occu PIED mode for a period of time from 0 to 4 hours configurable through Rover Default RUN The controller can be placed in occu PIED BYPASS mode by either com municating an occupancy request of BYPASS or by using the TIMED OVERRIDE i e ON button on the Trane zone sensor ON and cANcEL Buttons Some Trane zone sensors have oN and CANCEL buttons for timed over ride operation Pressing the ON button on the zone sensor when the unit is in the UNOCCUPIED mode initiates the OCCUPIED BY PASS mode and initializes the by pass timer The CANCEL button is used to send the unit back into UN OCCUPIED mode before the bypass timer has expired The oN button may also be used for the unit identification or
24. and peer to peer com munications as well as stand alone operation A number of con trol features may be configured at the factory or by using the Rover service tool See Configuration on page32 for more information Integrated Comfort System Note The Tracer ZN 520 controller may only be used with Tracer Summit version 11 0 or greater with aComm5 communications card Classroom unit ventilators can op erate as part of a large building au tomation system controlled by Tracer Summit The Tracer ZN 520 is linked directly to the Tracer Summit via a twisted pair commu nication wire Each Tracer Summit building automation system can SEE WIRING DIAGRAM zi FOR WIRING DETAIL connect to a maximum of 120 Tracer ZN 520 controllers Figure 4 Communications link wire The ICS system allows for com plete communication with the classroom unit ventilators via Tracer ZN 520 unit controller All points connected to the Tracer ZN 520 may be observed from the Tracer Summit front end control ler The Tracer Summit can also initiate an alarm on a loss of per formance or equipment malfunc tions N TWISTED PAIR OF WIRE USED IN INSTALLATION OF THE CONTROLLER IN CLASSROOM UNIT VENTILATORS Figure 5 Peer to peer communication connections UV SVPO1A EN The ICS system also allows all of the classroom unit ventilators to share information without the presence of hardwired sensors at each unit Some typical shared p
25. be present and correct for normal operation Unit configuration The controller must be properly configured based on the actual installed end devices and application When the unit configuration does not match the actual end devices the unit may not work correctly Diagnostic present A specific list of diagnostics affect compressor and electric heat operation For more information see Tracer ZN 520 Unit Controller diagnostics on page 52 for more information Manual output test The controller includes a manual output test sequence you can use to verify output operation and associated output wiring However based on the current step in the test sequence the DX or electric outputs may be OFF For more information see Manual Output Test on page 48 for more information Freeze avoidance When the fan is OFF with no demand for capacity 0 and the outdoor air temperature is below the freeze avoidance setpoint the controller disables compressors and electric heat outputs This includes UNOCCUPIED mode when there is no call for capacity or any other time the fan is OFF Normal operation The controller energizes the outputs only as needed to meet the unit capacity requirements Outside Air Damper Table 33 Outdoor air damper stays closed Probable cause Explanation Unit wiring The wiring between the controller outputs and the outdoor air damper must be present and correct for normal da
26. damage Tracer ZN 520 Wiring Require i i ments A total of two 1 4 inch me eka vent ar ie Q A minimum of 1 5 clearance E nde e pro the diagram provided on the from the pin centerline for vided for 24 VAC connection to the inside of the unit s access wires up to 16 AWG is board recommended for bending and panel for specific wiring infor forming wires Line Voltage 24 VAC Transformer E T ks k Chasis c m da mam Ground rJ Em gt Generic Output e a CL20 Figure 12 Power connection to the Tracer ZN 520 unit controller 24 UV SVPO1A EN TRANE Installation and Wiring Installing the Wall Mounted Zone Sensor Optional Zone sensor location is an impor tant element of effective room control and comfort The best sensor location is typical ly on a wall remote from the HVAC unit Readings at this loca tion assure that the desired set pointis achieved across the space not just near the unit itself ps Figure 13 Proper zone sensor placement Note All zone sensor wiring will be done in the factory unless zone sensor options are selected to be wall mounted When a unit mounted speed switch is selected with a wall mounted zone sensor the contrac tor must disconnect the cooling setpoint on the unit mounted sen sor if the wall mounted cooling setpoint is used The zone signal will be cut at the factory The unit mounted speed switch cannot be used as a zone sensor THe comm
27. for two hours oruntil normal operation is resumed The Tracer Summit or the Rover service tool is required to access this feature Fan Status There are two ways to do fan sta tus monitoring 1 The status of the fan is reported based on the state of the binary output s dedicated to fan control The fan status is reported as HIGH or Low whenever the corresponding binary output is directed on UV SVPO1A EN The fan status is reported as oFF when none of the fan out puts are directed on 2 The Tracer ZN 520 controller has a binary input available for a fan status device current sensing relay or differential pressure switch which can provide feedback of fan opera tion If the device does not indicate fan operation after 1 minute a unit shutdown is ini tiated and the unit is latched OFF Filter Status Maintenance Timer The unit filter status maintenance timer is based on the cumulative run hours of the unit fan The con troller compares the fan run time against an adjustable fan run hour limit and recommends unit main tenance as required The Rover service tool is used to edit the maintenance required set point time Once the setpoint limit is exceeded the controller gener ates a MAINTENANCE REQUIRED infor mational diagnostic When the maintenance required setpoint time is set to zero the controller disables this feature You can use the Trace Summit or the Rover service tool to clear the
28. information Table 34 Outdoor air damper stays open Probable Cause Explanation Unit wiring The wiring between the controller outputs and the outdoor air damper must be present and correct for normal damper operation Unit configuration The controller must be properly configured based on the actual installed end devices and application When the unit configuration does not match the actual end devices the damper may not work correctly Manual output test The controller includes a manual output test sequence you can use to verify output operation and associated output wiring However based on the current step in the test sequence the unit damper may be open For more information see Manual Output Test on page 48 for more information Normal operation The controller opens and closes the outdoor air damper based on the controller s occupancy mode and fan operation Normally the outdoor air damper is open during OCCUPIED OCCUPIED STANDBY and OCCUPIED BYPASS mode when the fan is running and closed during UNOCCUPIED mode unless the controller is economizing For more information see Modulating Outdoor Air Operation on page 43 for more information UV SVPO1A EN 58 TRANE Replacing Circuit Boards Tracer ZN 520 Unit Controller Replacement 1 Disconnect power or disable the circuit breaker to unit Remove bad or questionable Tracer ZN 520 controller cir cuit board
29. list of diagnostics affects fan operation For more information see Tracer ZN 520 Unit Controller diagnostics on page 52 for more information Manual output test The controller includes a manual output test sequence you can use to verify output operation and associated output wiring However based on the current step in the test sequence the unit fan may not be on For more information see Manual Output Test on page 48 for more information Fan mode OFF When a local fan mode switch provided on the Trane zone sensor determines the fan operation the off position controls the unit OFF Requested mode OFF You can communicate a desired operating mode such as OFF HEAT and COOL to the controller When OFF is communicated to the controller the unit controls the fan OFF There is no heating or cooling UNOCCUPIED operation When the controller is in the UNOCCUPIED mode the fan is cycled The controller operates the fan continuously when in the OCCUPIED OCCUPIED STANDBY or OCCUPIED Cycling fan operation continuous BYPASS mode When the controller is in the unoccupied mode the fan is cycled between HIGH speed and OFF with capacity UV SVPO1A EN 55 Valves Table 30 Valves stay closed TRANE Troubleshooting Probable cause Possible Explanation Unit wiring The wiring between the controller outputs and the valve s must be present and correct for normal valve operation
30. supports direct ex pansion DX compressor opera tion for cooling only The controller does not allow both the DX compressor and economiz er to operate at the same time This prevents problems where the en tering air temperature is too low for the evaporator coil to operate as designed Tracer ZN 520 also includes a fixed minimum on off time of 3 minutes for compressor operation to pre vent short cycling of the compres sor Electric Heat Operation The Tracer ZN 520 controller sup ports 1 or 2 stages of electric heat control To control space temperature electric heat is cycled to control the discharge air temperature The rate of cycling is dependent on the load in the space and the temperature of the incoming fresh air Baseboard Heat Operation The Tracer ZN 520 controller can be configured to support one stage of baseboard heat A 2 position valve or an electric heat contactor will be energized at 2 5 F below the effective heating setpoint The baseboard heat is de energized at 1 F below the effective heating setpoint The unit will provide heating ca pacity as required regardless of the presence of baseboard heat If the unit can not maintain the space temperature the baseboard heat will come on as a secondary stage If baseboard heat is to be used as the primary source of heating the discharge air high limit should be set to a moderate temperature This will allow the ventilation air to be tem
31. sured space temperature is within the active heating and cooling set points the heating and cooling ca pacity approaches zero Cooling Operation During the COOLING mode the Tracer ZN 520 controller attempts to maintain the space temperature atthe active cooling setpoint Based on the controller s occupan cy mode the active cooling set point is one of the following C Occupied cooling setpoint C Occupied standby cooling setpoint C Unoccupied cooling setpoint The controller uses the measured space temperature the active cooling setpoint and discharge air temperature along with the con trol algorithm to determine the re quested cooling capacity of the unit 0 10096 The outputs are con trolled based on the unit configu ration and the requested cooling capacity UV SVPO1A EN Heating Operation During the HEATING mode the Tracer ZN 520 controller attempts to maintain the space temperature at the active heating setpoint Based on the controller s occupan cy mode the active heating set point is one of the following C Occupied heating setpoint C Occupied standby heating setpoint Unoccupied heating setpoint The controller uses the measured space temperature the active heating setpoint and discharge air temperature along with the con trol algorithm to determine the re quested heating capacity of the unit 0 10096 The outputs are con trolled based on the unit configu ration and
32. the WINK feature See Winking on page38 for more information When the Tracer ZN 520 controller is connected to a Tracer Summit system or the Rover service tool the oN button may be used in place of the service pin for easy unit identification Heating And Cooling Changeover Logic The Tracer ZN 520 Unit Control ler can receive communicated re quests for heating or cooling operation The communicated variable nviApplicM ode is used to communicate the requests for the controller s operating mode based on the following values 0 Auto mode determined by controller 1 Heat uses heating setpoints 2 Morning Warm up 3 Cool uses cooling setpoints 39 e TRANE 4 Night Purge air changeover not supported 5 Pre cool morning cool down 6 Off no unit operation allowed 7 Test special test mode 8 Emergency Heat not supported Unit Operation 9 Fan Only no heating or cooling allowed All other enumerations will be in terpreted as Auto As the controller automatically de termines its heating or cooling mode it changes from cool to heat or from heatto cool while the error integrated over time between the active setpoint and the space tem C Cool Setpoint 4 C N OS 6 RN 900 F S gt gt Ku Oy ec J Heat Setpoint 1 X Figure 17 Heat Cool Changeover logic If the measured space temperature is 69 F and the active cooling set point is 72 F the e
33. the requested heating capacity Fan Operation For multiple fan speed applica tions the Tracer ZN 520 controller allows separate defaultfan speeds to be configured for heating and cooling modes When the fan mode switch is in the AuTO posi tion or no hardwired input exists the fan operates at the configured default fan speed i e HIGH The Tracer ZN 520 controller also allows the default fan speed to be configured as AUTO When the fan speed switch is in the AuTO posi tion and the default fan speed is configured as AUTO the unit may change fan speeds based on the requested heating or cooling ca pacity In this mode the unit fan will operate atLow speed until the requested capacity requires HIGH fan speed operation to maintain space comfort The fan mode request can be ei ther hardwired or communicated to the Tracer ZN 520 controller When both are present the com municated request has priority over the hardwired input Addi tional flexibility in the controller al lows the fan speed switch to be disabled When this occurs the unit will operate at the default fan speed unless a communicated re quest is present During OCCUPIED OCCUPIED STANDBY ahdOCCUPIED BYPASS modes the fan will normally oper ate continuously at the appropri ate fan speed The fan will only be orr in these modes when the MAN UAL OUTPUT TEST has been initiat ed a latching diagnostic is pen or the communicated or ardwired fan
34. Off Off Off 4 Fan low Off Off Low Off NA On Off Off NA Off Off Off Be Main open High or of On NA On off off NA off off off DX on 6 Main close DX off aux High Off Off Off NA On Off On NA Off Off Off open 75AnxXOp n High Exh Off Off NA On Off On NA off off off exhaust far 8 Aux close e High Off Off Off NA Off On Off NA On Off Off damper open 9 Outdoor air ioh of of Off NA Off On off NA off on off damper close 10 Generic baseboard heat High Off Off Off NA Off On Off NA Off Off On energized 11 Exit Exit 1 Upon entering manual output test mode the controller turns off all fan outputs and drives all dampers and valves closed if required 2 At the beginning of step 2 the controller attempts to clear all diagnostics 3 If the unit is configured for a 2 speed fan the fan remains on high speed at step 3 4 If the unit is configured for a 2 speed fan the low fan speed output energizes at step 3 If the unit is configured for a 1 speed fan the fan remains on high speed at step 3 5 If the unit is configured for a 1 or 2 speed fan the exhaust fan output energizes on step 7 The exhaust fan output is shared with medium fan speed 6 After step 10 the test sequence performs an exit This initiates a reset and attempts to return the controller to normal operation UV SVP01A EN 50 Troubleshooting Safeties Freeze Protection The Tracer ZN 520 controller has two methods o
35. Run mode symbol in display press the hand S key to reverse the load status e g if the load was ON itis now OFF A hand symbol N appears to indi cate the override is active At the next scheduled event auto matic program control will re sume eliminating the override To switch the load permanently ON press the amp key a second time 9 appears in the display UV SVPO1A EN A ppendix Timeclock TRANE To switch the load permanently OFF press the W key a third time O appears in the display To return to automatic pro grammed operation press the YN key a fourth time Run amp appears in the display NOTE The Main Power Disconnect switch is located on the lower right side of the unit behind the right front cabinet panel It is only used to remove power to the unit for servicing UV SVPO1A EN 67 TRANE Appendix Location Identifier This area provided for the removable tag NID E 01 00 1C 7B DB Serial Location n Conterenca Room 101 68 UV SVPO1A EN UV SVPO1A EN Location ldentifier TRANE TRANE Location Identifier UV SVPO1A EN UV SVPO1A EN Location ldentifier TRANE TRANE The Trane Company Worldwide Applied Systems Group LaCrosse Wisonsin www trane com An American Standard Company E X qa
36. and alone systems the Rover service tool Communication to the Tracer ZN 520 or multiple controllers can also be accomplished by using the ICS software service tool A personal computer running Rov er may be directly connected to a standalone Tracer ZN 520 con nected to the communications jack in the Trane zone sensor or con nected to a communicating unit s Tracer ZN 520 unit controller to ac cess all of the units on a communi cating link Rover allows the user to interface with the Tracer ZN 520 but will not allow any advanced control e g equipment scheduling or trend ing To purchase a copy of the ICS Software service tool contact the BAS department at your local Trane dealer Interoperability Trane has lead the industry with BACnet interoperability and Trane is now expanding the realm of in teroperable solutions by offering LonMark certified unit controllers The Tracer ZN 520 controller con forms to the LonMark Space Com fort Controller profile See Appendix Data Lists on page64 for more information This allows the ZN 520 to be used as a unit controller on other control systems that support LonTalk and the SCC profile Now building own ers have more choices and design engineers have more flexibility to meet the challenges of building au tomation UV SVPO1A EN Standard End Devices Table 2 End Device Specifications Device Description Fan Status Switch Contact Blade Pilot du
37. and minutes by pressing h and m respec tively Then set the day with the Day key using the number corresponding to the day of the week 1 is Monday 7 is Sunday 5 Release and the colon in the display will begin flash ing Set the Program Determine in advance how you want the unit to operate For normal occupied operation the unit load is set ON whether in heating or cooling This means 65 TRANE the unit will respond differently to changing conditions and maintain a higher comfort level For unoccupied operation or no load conditions a lower comfort level is provided The load can be switched off by using the program for periods when the room will be unoccupied Note If the room will be unoccupied the time clock should be programmed accordingly to conserve energy The position of the outside damper can allow too much outside air in an unoccupied space if the unit s time clock is set for load or occupied mode and can result in unnecessary unit cycling and undesirable heat transfer Remember that the program is easily changed and can also be overridden after it is initially set 1 Press the Prog key Spaces or fields for entering time hours and minutes appear as dashes separated by a colon 2 Press Prog again The num ber of free available pro grams is given in this case to be Fr20 or 20 3 Press Prog again to return to the event time mode 4 Toggl
38. ard heat ENABLED Non latching Communicated or manual reset CO Sensor Failure Fan ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX electric heat ENABLED Baseboard heat ENABLED Non latching Communicated or manual reset Generic AIP Failure Fan ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX electric heat ENABLED Baseboard heat ENABLED Non latching Communicated or manual reset Defrosting Cmpr Lockout Fan ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX electric heat OFF Baseboard heat ENABLED Non latching Communicated or manual reset Maintenance Required Fan ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX electric heat ENABLED Baseboard heat ENABLED Non latching Communicated or manual reset Local Fan Mode Failure Fan ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX Electric Heat ENABLED Baseboard heat ENABLED Non latching Communicated or manual reset Local Setpoint Failure Fan ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX electric heat ENABLED Baseboard heat ENABLED Non latching Communicated or manual reset Generic Temperature Failure Fan ENABLED
39. between the minimum po sition and 100 to control the amount of cooling capacity When the outdoor air temperature rises 5 F above the economizer enable setpoint the outdoor air damper returns to its minimum position and mechanical cooling is initiated ASHRAE Cycle ASHRAE Cycle admits 100 out door air except during the warm up cycle or the unoccupied mode To set up the Tracer ZN 520 controller for ASHRAE Cycle conformance set the occupied outdoor air damp er minimum position to 10096 44 Unit Operation ASHRAE Cycle II The Tracer ZN 520 controller con forms to ASHRAE Cycle II by allow ing the modulating outdoor air damper to maintain a minimum position during the occupied mode unless economizing is enabled or the space temperature falls more than 3 F below the effective set point If the space temperature falls more than 2 F below the setpoint the outdoor air damper will begin to close When the space temperature hits 3 F below the setpoint the outdoor air damper is completely closed Figure 22 ASHRAE cycle 2 DX Operation Tracer ZN 520 supports direct ex pansion DX compressor opera tion for cooling only The controller does not allow both the DX compressor and economiz er to operate at the same time This prevents problems where the en tering air temperature is too low for the evaporator coil to operate as designed Tracer ZN 520 also includes a fixed minimum on off time
40. ble point and off at O Unit Operation Valve Operation Modulating Valves The Tracer ZN 520 controller sup ports one or two modulating valves for hydronic heating and cooling operation The main valve coil is used for cooling only heat cool changeover 2 pipe applica tions or cooling 4 pipe applica tions The auxiliary valve coil provides heating in 4 pipe and heating only applications At power up the Tracer ZN 520 controller drives the modulating valves to the closed position The controller calibrates to the full closed position by overdriving the actuator 13596 Whenever the con troller requests a valve position of zero or 10096 the controller over drives the actuator 13596 regard less of the current valve position Face and Bypass Isolation Valves Face and bypass units may use isolation valves to prevent unwant ed water flow in the coil This elim inates problems such as radiant heat or excessive condensate in 2 pipe systems In 4 pipe applications the isolation valves are used to prevent conflict ing capacities within the unit Face and Bypass Damper Operation Note The Face and bypass actuator is located in the right hand end pocket of the classroom unit ventilator The Tracer ZN 520 controller actu ates a face and bypass damper to modulate a percentage of air to the face of the coil to maintain space comfort When a requested capaci ty is present the unit modulates the damp
41. cated re quests for heating or cooling operation The communicated variable nviApplicM ode is used to communicate the requests for the controller s operating mode based on the following values 0 Auto mode determined by controller 1 Heat uses heating setpoints 2 Morning Warm up 3 Cool uses cooling setpoints 39 e TRANE 4 Night Purge air changeover not supported 5 Pre cool morning cool down 6 Off no unit operation allowed 7 Test special test mode 8 Emergency Heat not supported Unit Operation 9 Fan Only no heating or cooling allowed All other enumerations will be in terpreted as Auto As the controller automatically de termines its heating or cooling mode it changes from cool to heat or from heatto cool while the error integrated over time between the active setpoint and the space tem C Cool Setpoint 4 C N OS 6 RN 900 F S gt gt Ku Oy ec J Heat Setpoint 1 X Figure 17 Heat Cool Changeover logic If the measured space temperature is 69 F and the active cooling set point is 72 F the error between the space temperature and the set point is three degrees If the same error exists for one minute 60 sec onds the integration term is 3 F 60 Sec or 180 F Sec The Tracer ZN 520 Unit Control ler changes from heating to cool ing and cooling to heating when the integration term exceeds 900 F Sec Along with sat
42. ckage combines HVAC equip ment and building management into one environmental comfort system Integrating the Tracer ZN 520 on classroom unit ventilators and tying them to a Tracer Summit system will provide a complete building management system The stand alone control package offers the features and function ality of the direct digital control without a front end building au tomation system while providing future considerations for ICS Equipment problems can often be diagnosed on each unit without having to access the unit compo nets These diagnostics can be re ceived remotely via a modem with a Tracer Summit building automa tion system thus reducing the number of actual on site service calls through the Rover service tool connected to a communica tion jack located inside the Trace cone sensor or connected to the unit UV SVPO1A EN Figure 1 Tracer ZN 520 Control Board The Tracer ZN 520 is factory mounted tested wired config ured and commissioned for the se lected application The Tracer ZN 520 configuration has flexible point and product con figurations For example with point configuration a specific bi nary point can be configured to ac cept input from either a time clock or some type of generic device General Information Table 1 Tracer ZN 520 Unit Controller features and coil availability Aut F d Entering Multiple Dehumid MED SERM Valve Economizer Auxiliary Water Coi
43. cled Cycling the fan switch If the user cycles the fan speed switch from OFF to any speed the controller resets all diagnostics Diagnostics may recur immediate ly if the problem still exists Probable cause Possible Explanation Unit wiring The wiring between the controller outputs and the fan relays and contacts must be present and correct for normal fan operation No power to the controller If the controller does not have power the unit fan does not operate For the Tracer ZN 520 Unit Controller to operate normally it must have an input voltage of 24 VAC When the green LED is off continuously the controller does not have sufficient power or has failed Unit configuration The controller must be properly configured based on the actual installed end devices and application When the unit configuration does not match the actual end devices the fans may not work correctly Random start observed After power up the controller always observes a random start from 5 to 30 seconds The controller remains off until the random start time expires Power up control wait 1 When power up control wait is enabled non zero time the controller remains off until one of two conditions occurs The controller exits power up control wait once it receives communicated information 2 Thecontroller exits power up control wait once the power up control wait time expires Diagnostic present A specific
44. e 52 for more information Manual output test The controller includes a manual output test sequence you can use to verify output operation and associated output wiring However based on the current step in the test sequence the valve s may be open For more information see Manual Output Test on page 48 for more information Sampling logic The controller includes entering water temperature sampling logic which automatically invoked during 2 pipe and 4 pipe changeover when the entering water temperature is either too cool or too hot for the desired heating or cooling For more information see Entering Water Temperature Sampling on page 43 for more information UV SVPO1A EN 56 Table 31 Valves stay open TRANE Troubleshooting Probable cause Possible Explanation Freeze avoidance When the fan is off with no demand for capacity 0 and the outdoor air temperature is below the freeze avoidance setpoint the controller opens the water valves 100 to prevent coil freezing This includes unoccupied mode when there is no call for capacity or any other time the fan is off Normal operation The controller opens and closes the valves to meet the unit capacity requirements DX Electric Heat Table 32 DX or electric output s does not energize Probable cause Possible Explanation Unit wiring The wiring between the controller outputs and the end devices must
45. e air temperature set point Default minimum damper positions are provided and can be changed for occupied and occu pied standby modes or for low speed operation The controller can also receive a communicated outdoor air damper minimum po sition from Tracer Summit A com municated minimum position from Tracer Summit has priority over all configured setpoints During the oc cuPIiED mode the outdoor air damper will always be controlled to the effective mini mum position unless ASHRAE Cy cle I ASHRAE Cycle Il or economizing modes are active gt Figure 20 OA RA actuator mounting for the vertical unit ventilator Figure 21 Figure 2 OA RA actuator mounting for the horizontal unit ventilator 43 e TRANE Automatic Outdoor Air Damper Adjustment The Tracer ZN 520 controller is ca pable of using different minimum outdoor air damper positions for high and low fan speeds which are configurable This allows the venti lation rate to be maintained when switching between fan speeds Note The typical reduction in airflow between high and low fan speeds is 25 however if precise control is desired an air balancer should be consulted Economizer Operation Note When there is a request for 0 or 100 actuator position the actuator will overdrive the actuator 135 to help maintain calibration With a valid outdoor air tempera ture hardwired or communicated Tracer ZN 520 uses the modu
46. e se quence reset the controller diag nostics See Manual Output Test on page 48 for more information Cycling power When turned off the controller s 24 VAC power and re applies 54 Troubleshooting TRANE power the unit cycles through a power up sequence and clears all timers By default the controller attempts to reset all diagnostics at power up Diagnostics present at power up and those that occur after pow er up are handled according to the defined unit diagnostics sequenc es For more information see Table 28 Tracer ZN 520 Unit Controller diag nostics on page 52 for more information Building automation system Some building automation sys tems i e Tracer Summit building automation system can reset di agnostics in the Tracer ZN 520 unit controller For more complete information refer to the product literature for the building automa tion system Rover service tool Rover service tool can reset diag nostics in the Tracer ZN 520 unit controller For more complete in formation refer to the Rover In stallation Operation and Programming manual Questionable unit operation Fans Table 29 Fan outputs do not energize Diagnostic reset Any device that can communicate the network variable nviRequest enumeration clear alarm can reset diagnostics in the Tracer ZN 520 unit controller The con troller also attempts to reset diag nostics whenever power is cy
47. e the Load key on lor off O to link the time with the action In the example from the pre ceding step you would set the load ON 5 Enterthe time for the first pro gram event For example should you want the unit to operate under load for an occupied period at 8 00 a m enter 08 00 AM on the display using the h and m keys Better yet enter the time 66 Appendix Timeclock a half hour or so before the arrival of people so the unit will bring the room up or down to the preset occupied temperature setpoints 6 Ifthe program event you just entered will be the same every day as indicated by all seven day numbers at the top of the display you can press Prog to lock in that event and go to the next event If not and the program will vary during the week e g different program for the weekend don t press Prog go to the following step Note If you press Prog by mistake simply continue to press Prog until the event comes up in review and make the change 7 With the time and hour for the event set select the day or days for which the event applies by pressing the Day key Toggling the Day key gives you ten options for indi vidual days or combinations that can be applied Select one and lock it in by pressing Prog In the example if you only want the unit to operate under load for the time set for week days you would select 1234 5 by pressing Day then s
48. elect another program event for the weekend 8 Repeat the preceding steps to set the next program event A load event is followed by an unload event For example if the unit is programmed for a load condition in the morning you could program the unit to unload later in the day or at night when the room will become unoccupied fora period If the occupied and unoccupied periods vary widely but predictably you can program a cycle of events during any day or combination of days up to 20 events 9 Note If only one event is pro grammed the unit will remain in that load or unload condi tion all the time 10 When all the events are pro grammed press the run key for normal operation The current time as set will be dis played along with the run symbol Review and Change Programs To review a program and events at any time press Prog at any time Programs events will be displayed in the sequence they were entered with repeated presses of Prog To change a program select the event as in the previous paragraph and alter the new data day hour minute as desired to overwrite the old program Press Prog to store the data To delete a program event select the event again and press h and m until dashes appear in the time dis play Press either Prog or until the dashes flash in the display To reset all program data press Res Override Program Manual Operation While in the
49. ent temperature protection and is only invoked when thefan is OFF This includes the UNOCCUPIED mode when there is no call for ca pacity or any other time the fan is 45 e TRANE OFF due to a safety or command The controller enters the FREEZE AVOIDANCE mode when an out door air temperature is present communicated or hardwired and itis below the freeze avoidance set point configurable The controller disables freeze avoidance when the outdoor air temperature rises 3 F above the freeze avoidance setpoint When the controller is in the freeze avoidance mode All water valves are driven open to allow water flow through the coil Fan is OFF C Face and bypass damper when present is in full BYPASS U DX and electric heat are OFF MORNING WARM UP The Tracer ZN 520 controller keeps the modulating outdoor air damp er closed anytime during theoccu PIED mode when the space temperature is 3 F or more below the heating setpoint hl Cebar cL comm E Link Figure 23 Simple data sharing application 46 Unit Operation The damper remains closed indefi nitely during morning warm up until the space temperature is with in 2 F of the effective heating set point The unit runs at full capacity until setpoint is met COOL DOWN The Tracer ZN 520 controller keeps the modulating outdoor air damp er closed for up to one hour at ev ery transition from UNOCCUPIED to OCCUPIED mode when the
50. erto allow more airto the face of the coil An averaging sen Sor is used on the discharge air to provide accurate capacity control Figure 18 Horizontal unit with face and bypass damper option 42 UV SVPO1A EN U nit Operation TRANE A AA A Figure 19 Vertical unit with face and bypass damper operations Upon power up the controller cal ibrates the face and bypass damp er to the full bypass position by overdriving the damper actuator During normal operation whenev er the Tracer ZN 520 controller generates a face and bypass damper position request of zero or 100 the unit calibrates the actu ator by overdriving the damper ac tuator 135 Entering Water Temperature Sampling Units with 4 pipe changeover and 2 pipe changeover require an en tering water temperature to deter mine if the appropriate water temperature is present for the re quested mode heating or cool ing This temperature may be communicated in an ICS system or hardwired to the Tracer ZN 520 UV SVPO1A EN controller for standalone applica tions When a unit uses 2 way modulat ing valves itis possible for the wa ter near the entering water temperature sensor to migrate to wards ambient temperature The Tracer ZN 520 controller has a wa ter sampling feature for these ap plications When the sensed water temperature is not sufficient for the requested heat cool mode 5 F above the zone temperature for heating o
51. ery of heat when heating is required In the Coot mode all hydronic cooling is locked out but normal fan and outdoor air damper operation is permitted Note These diagnostics are non latching and automatically reset when the input is present and valid Note When the outdoor air temperature sensor has failed or is not present the Tracer ZN 520 Unit Controller generates a diagnostic to indicate the sensor loss condition The controller automatically clears the diagnostic once a valid outdoor air temperature value is present non latching diagnostic When the outdoor air temperature sensor fails or is not present the controller prohibits economizer operation A value of Enable or Disable for nviEconEnable overrides these decisions regardless of the presence of an outdoor air temperature value or failure For more information see Interoperability on page 12 for more information For more information see Data Sharing LonWorks Normal Non latching Communicated or manual reset on page 46 for more information Translating Multiple Diagnostics The controller senses and records each diagnostic independently of other diagnostics It is possible to have multiple diagnostics present simultaneously The diagnostics are reported in the order they oc cur Resetting Diagnostics There are many ways to reset unit diagnostics U Automatically by the controller By initiating a manual output test at the controller B
52. evice selected to blink at a rate of twice per sec ond for approximately 10 seconds This feature is useful when a dis crepancy in device location exists As part of the troubleshooting pro Cess one person can w Nk the de vice while another can observe the blinking and verify the device s physical location Important If the status LED on the ZN 520 does not blink the device may not be communicating or it may not be the device you selected according to the stored address A Tracer ZN 520 unit controller may be set to wink by Q holding the on button on the zone sensor for 5 seconds Q using Rover Trane s communication service tool UV SVPO1A EN Unit Operation TRANE Power Up When 24 VAC is initially applied to the controller the following se quence of events occurs U Green status LED turns on Q All outputs are controlled orr Q The controller reads input values to determine initial values C Random start timer expires 5 to 30 seconds Q When POWER UP CONTROL WAIT is enabled the controller waits 0 120 seconds depending on configuration to allow ample time for communicated control data to input If the controller does not receive communi cated information standalone control is assumed Q All modulating valves and dampers calibrate closed C NORMAL operation begins Occupancy The valid occupancy modes for the Tracer ZN 520 controller are occuPiED Normal
53. expires 5 to 30 seconds random Power up control Wait feature is applied When power up control Waitis enabled the controller waits 120 seconds to allow ample time for commu nicated control data to arrive If after 120 seconds the con troller does not receive a com municated occupancy request the unit assumes standalone operation All modulating valves and damper calibrate closed face and bypass damper calibrate to bypass when present Normal operation begins after 290 potentially seconds have passed Note Manual output test can be initiated at any time Start up Procedures UV SVPO1A EN General Information Tracer ZN 520 Overview The Trane Tracer ZN 520 con troller is a factory installed and commissioned direct digital controller DDC offering for classroom unit ventilator sys tems See Figure 1 Tracer ZN 520 Control Board The Trac er ZN 520 can also be applied to other Trane interoperable HVAC E including the fan coil and blower coil products For more information see Table 1 Tracer ZN 520 Unit Controller features and coil availability on page 8for more information For more information regarding the application of the Tracer ZN 520 to other Trane products contact the appropriate local Trane sales office Trane offers a complete solution to space comfort control with the flexibility of Integrated Comfort System ICS and stand alone control packages The ICS control pa
54. f freeze protection 1 An optional binary freezestat that is wired to a binary input The freezestat is a capillary tube type and is factory set to 35 F When this device opens a Low Coil Temp Detect diagnostic is generated 2 Using the discharge air tem perature sensor if the dis charge air temperature falls below the discharge air low limit the controller increases the heating capacity to temper the air If the discharge air temperature remains below the discharge air low limit for 3 minutes the controller gen erates a Low Coil Temp Detect diagnostic Fan Failure A Low Air Flow Fan Failure di agnostic is generated when a fan status device is present and fails to close after 1 minute of unit start up or when it opens for more than 1 minute during normal unit opera tion Space Temperature Failure If the Tracer ZN 520 has validated a space temperature input and then the input becomes invalid a space temperature failure diag nostic occurs Entering Water Temperature Failure If the Tracer ZN 520 has validated an entering water temperature in put and then the input becomes in valid an entering water temp erature failure diagnostic occurs UV SVPO1A EN Discharge Air Temperature Limit When the discharge air exceeds the high or low limit setpoint and the unit can not correct it by alter ing capacity a Discharge Air Temp Limit diagnostic is generat ed Outdoor Air Temperature
55. g DEFROST the condensing unit is orr the outside air damper is setto the minimum positions and the fan will continue to oper ate as continuous The unit will re main in the DEFROST mode until the senor resets at 48 F The unit will return to NORMAL operation af ter the mode is discontinued FREEZE AVOIDANCE FREEZE AVOIDANCE is used as low ambient temperature protection and is only invoked when thefan is OFF This includes the UNOCCUPIED mode when there is no call for ca pacity or any other time the fan is 45 e TRANE OFF due to a safety or command The controller enters the FREEZE AVOIDANCE mode when an out door air temperature is present communicated or hardwired and itis below the freeze avoidance set point configurable The controller disables freeze avoidance when the outdoor air temperature rises 3 F above the freeze avoidance setpoint When the controller is in the freeze avoidance mode All water valves are driven open to allow water flow through the coil Fan is OFF C Face and bypass damper when present is in full BYPASS U DX and electric heat are OFF MORNING WARM UP The Tracer ZN 520 controller keeps the modulating outdoor air damp er closed anytime during theoccu PIED mode when the space temperature is 3 F or more below the heating setpoint hl Cebar cL comm E Link Figure 23 Simple data sharing application 46 Unit Operation The damper remains cl
56. ge air temperature Analog ground Outdoor air temperature Generic temperature Analog ground Power port Universal input Generic 4 20ma Humidity CO2 Analog ground Installation and Wiring Range 5 to 122 F 15 to 50 C NA 40 to 115 F 4 4 to 46 1 C 4821 to 4919 Q Off 2297 to 2342 Q Auto 10593 to 10807 Low 13177 to 13443 Q Medium 15137 to 16463 Q High NA 40 to 212 F 40 to 100 C NA 40 to 212 F 40 to 100 C NA 40 to 212 F 40 to 100 C NA 4 20 mA 0 100 0 100 0 2000ppm NA 21 M ounting The Tracer ZN 520 circuit board is mounted in the left hand end pock et for all classroom unit ventilator configurations The sheet metal mounting plate has raised emboss es to accept the mounting feet on the circuit board See Figure 8 Classroom unit ventilator control box with close up of horseshoe embosses and circuit board mounting feet This design al lows the Tracer ZN 520 controller to be secured with a minimal num ber of sheet metal screws Installation and Wiring Figure 8 Classroom unit ventilator control box with close up of horseshoe embosses and circuit board mounting feet 22 Installation and Wiring The mounting position on the ver tical classroom unit ventilator configuration allows complete ac cess to the Tracer ZN 520 by re moving the front panel See Figure 9 Vertical classroom unit ventilato
57. gured setpoints During the oc cuPIiED mode the outdoor air damper will always be controlled to the effective mini mum position unless ASHRAE Cy cle I ASHRAE Cycle Il or economizing modes are active gt Figure 20 OA RA actuator mounting for the vertical unit ventilator Figure 21 Figure 2 OA RA actuator mounting for the horizontal unit ventilator 43 e TRANE Automatic Outdoor Air Damper Adjustment The Tracer ZN 520 controller is ca pable of using different minimum outdoor air damper positions for high and low fan speeds which are configurable This allows the venti lation rate to be maintained when switching between fan speeds Note The typical reduction in airflow between high and low fan speeds is 25 however if precise control is desired an air balancer should be consulted Economizer Operation Note When there is a request for 0 or 100 actuator position the actuator will overdrive the actuator 135 to help maintain calibration With a valid outdoor air tempera ture hardwired or communicated Tracer ZN 520 uses the modulating economizer damper as the highest priority source of cooling The controller initiates the econo mizer function if the outdoor air temperature is cold enough to be used for free cooling capacity If the outdoor air temperature is less than the economizer enable set point absolute dry bulb the con troller modulates the outdoor air damper
58. he unit to prevent the coil from freezing 2 The control algorithm is limited to calculating this discharge air temperature based on capacity request Freeze Avoidance Table 17 Freeze avoidance setpoint range Freeze avoidance setpoint 20 to 60 F The controller disables freeze avoidance when the outdoor air temperature rises 3 F above the freeze avoidance setpoint 36 UV SVPO1A EN Configuration Occupied Bypass Timer Table 18 Bypass timer range 0 to 240 minutes O b ti 1 120 Minut ccupancy bypass timer npe 1 minute resolution 1 The occupied bypass timer is used for timed override applications Power Up Control Wait Table 19 Control wait timer Power up control wait 2 minutes 120 seconds Disable or enable Maintenance Timers Table 20 Maintenance timer range UV SVPO1A EN 37 e TRANE Unit Identification Tag Theunitidentification tag is factory mounted and provided for easy identification of an installed unit It contains model number tagging and location information The top portion of the unit identifi cation tag remains permanently af fixed to the unit for identification purposes The bottom portion of the tag provides pertinent informa tion that is removable to be placed on building plans or in Appen dix Location Identifier on page68 This provides identifica tion history about the unit s loca tion for quick reference These tags provide informatio
59. ing and cooling setpoints and a different outside air damper position The OCCUPIED STANDBY modeis initiated only when occupancy is communicated to the Tracer ZN 520 controller and the hard wired signal to the occupancy in put is calling for unoccupied operation OCCUPIED BYPASS mode The OCCUPIED BYPASS mode is used to transition the unit from the UNOCCUPIED mode to the occu PIED mode for a period of time from 0 to 4 hours configurable through Rover Default RUN The controller can be placed in occu PIED BYPASS mode by either com municating an occupancy request of BYPASS or by using the TIMED OVERRIDE i e ON button on the Trane zone sensor ON and cANcEL Buttons Some Trane zone sensors have oN and CANCEL buttons for timed over ride operation Pressing the ON button on the zone sensor when the unit is in the UNOCCUPIED mode initiates the OCCUPIED BY PASS mode and initializes the by pass timer The CANCEL button is used to send the unit back into UN OCCUPIED mode before the bypass timer has expired The oN button may also be used for the unit identification or the WINK feature See Winking on page38 for more information When the Tracer ZN 520 controller is connected to a Tracer Summit system or the Rover service tool the oN button may be used in place of the service pin for easy unit identification Heating And Cooling Changeover Logic The Tracer ZN 520 Unit Control ler can receive communi
60. ing or cool ing plant operation is required for the unit to deliver heating or cool ing To determine whether the cen tral plantis providing the desired water temperature an entering water temperature sensor either hardwired or communicated must be present UV SVPO1A EN Unit Operation TRANE The entering water must be five degrees or more above the space temperature to allow hydronic heating and five degrees or more below the space temperature to al low hydronic cooling If the desired water temperature is available the unit begins normal heating and cooling operation If the measured entering water tem perature is not adequate for the desired heating or cooling the controller begins the entering wa ter temperature sampling logic The Tracer ZN 520 Unit Control ler operates the modulating valves and dampers based on a heating or cooling capacity calculated by the control algorithm The control algorithm calculates the heating or cooling capacity based on the measured space temperature the active setpoint and the discharge air temperature When the mea sured space temperature is within the active heating and cooling set points the heating and cooling ca pacity approaches zero Cooling Operation During the COOLING mode the Tracer ZN 520 controller attempts to maintain the space temperature atthe active cooling setpoint Based on the controller s occupan cy mode the active cooling set poin
61. isabled Damper Enabled Fan Enabled Heating Enabled Cooling Disabled Damper Disabled Fan Enabled Heating Disabled Cooling Cooling Cooling Enabled Damper Enabled Fan Enabled Heating Disabled Pre cool Pre cool Cooling Enabled Damper Disabled Determined by controller Morning warm up Morning warm up Fan Disabled Heating Disabled pii MIR Cooling Disabled Damper Disabled Fan Enabled Heating Enabled West WE Cooling Enabled Damper Enabled Fan Enabled Fan only Fan only Heating Disabled Cooling Disabled Damper Enabled Not present Determined by controller Fan Enabled Heating Enabled Cooling Enabled Damper Enabled Any state Heating Fan Enabled Heating Enabled Cooling Disabled Damper Enabled Morning warm up Any state Morning warm up Fan Enabled Heating Enabled Cooling Disabled Damper Disabled 62 UV SVPO1A EN TRANE Appendix Unit Operation cont Table 39 Unit operation based on the effective heat cool output Effective heat cool mode output Unit Operation nvoHeatCool Any state ed Heating Disabled Cooling Enabled Damper Pre cool Any state Pre cool Fan Enabled Heating Disabled Cooling Enabled Damper Disabled Application mode input Heat cool mode input nviA pplicMode nviHeatCool Off Any state Off Fan Disabled Heating Disabled Cooling Disabled Damper Disabled Test Any state Determined by controlle
62. isfy ing the integration for heating and cooling changeover the measured space temperature must fall out side the setpoint range This means the space temperature must be greater than the active 40 cooling setpoint or lower than the active heating setpoint Example If the cooling setpoint is 75 F and the heating setpoint 70 F any space temperature greater than 75 F or less than 70 F is outside the setpoint range Once the integration term is satis fied and the space temperature is outside the setpoint range the controller changes modes Howev er before the unit s heating or cooling capacity ramps up the controller checks to make sure it is capable of heating or cooling For some units heating and cool ing capability exists with local re sources such as electric heat or perature is 900 F Sec Integra tion only begins once the heating and cooling capacity is equal to 096 or the discharge air temperature is being limited by the discharge air temperature control limits See Figure 17 Heat Cool Changeover logic Time gt x e d Unit M compressors For these units cen tral heating or cooling plan opera tion is not required for heating or cooling because they are capable of providing their own local heat ing or cooling For 2 pipe changeover and 4 pipe changeover units with hydronic ca pacity heating and cooling is pro vided through hydronic For those hydronic central heat
63. l SR Damper Bypass Fan Speeds ification Control Damper Heat Temperature Adjust Damper Sampling 2 pipe changeover X X X X X X X 2 pipe hot water X X X X X X only 2 pipe steam only X X X X X 2 pipe changeover X X X X X X X electric heat 2 pipe cool only X X X X 2 pipe cool only x x X X x electric heat 4 pipe hot water X x X x X X X chilled water 4 pipe changeover X X X x X X X X 4 pipe steam chilled X X X X X water Electric heat only X X DX hot water x x X X X DX steam X x X X X DX electric heat X X DX cooling only X 1 Multiple fan speeds are available in hydronic units only 2 Auxiliary heat is designed to bring on baseboard heat as the second stage of heating The baseboard heat must be the same type as the unit heating coil 3 Units with face bypass dampers cannot actively dehumidify 8 UV SVPO1A EN Controller Circuit Board Features co zz Generic AS B wu z 2 C Tas s TT e23 gt aa efa an w en o q i zk 25 o o 1 ei en n e gt cen ce e NL UCUUNECO S S aza ZN 520 T Controller 0 to Eg ce CH R196 en acsi Gi 3 x Er uf a p UR s e 22 4 T rad m n L2 L s 4 n2 223 ese ceesetetereeree yy Mls S e jg H HER al Communications Zone Sensor Connections Figure 2 Tracer ZN 520 unit controller circuit board UV SVPO1A EN
64. lating economizer damper as the highest priority source of cooling The controller initiates the econo mizer function if the outdoor air temperature is cold enough to be used for free cooling capacity If the outdoor air temperature is less than the economizer enable set point absolute dry bulb the con troller modulates the outdoor air damper between the minimum po sition and 100 to control the amount of cooling capacity When the outdoor air temperature rises 5 F above the economizer enable setpoint the outdoor air damper returns to its minimum position and mechanical cooling is initiated ASHRAE Cycle ASHRAE Cycle admits 100 out door air except during the warm up cycle or the unoccupied mode To set up the Tracer ZN 520 controller for ASHRAE Cycle conformance set the occupied outdoor air damp er minimum position to 10096 44 Unit Operation ASHRAE Cycle II The Tracer ZN 520 controller con forms to ASHRAE Cycle II by allow ing the modulating outdoor air damper to maintain a minimum position during the occupied mode unless economizing is enabled or the space temperature falls more than 3 F below the effective set point If the space temperature falls more than 2 F below the setpoint the outdoor air damper will begin to close When the space temperature hits 3 F below the setpoint the outdoor air damper is completely closed Figure 22 ASHRAE cycle 2 DX Operation Tracer ZN 520
65. meters Rover service tool uses the unit type to determine and download many other aspects of the unit con figuration such as the default ana log input configuration the default binary input configuration and the cane binary output configura ion Cooling source U None Q Hydronic main coil changeover Dedicated hydronic O DX 32 Heating source None Hydronic Dedicated hydronic Steam Electric heat Hydronic main coil changeover dedicated hydronic auxiliary coil Hydronic main coil changeover U U LU U and 2 stage electric heat face and bypass damper baseboard heat dehumidification and ge neric I O The controller also sup ports HIGH and Low fan speeds with exhaust fan output on 1 and 2 speed fan applications Electric Heat Economizer Baseboard 1 or 2 stage Damper Heat v v v v v UV SVPO1A EN Configuration Binary Outputs Table 10 Binary output summary Binary output Classroom unit ventilator Valid range Cooling valve open J 1 5 Face bypass cool isolation valve Normally open or normally closed 2 position cooling Normally open or normally closed DX Face bypass damper close Heating valve open J 1 9 Face bypass heat isolation valve J H Outdoor air damper open J 1 12 Outdoor air camper close N TB4 1 TB4 2 Terminals Output Rating Load Energized Load De energized Generic baseboard heat output TB4 1 i i 12 VA 1VAC RMS typical
66. mode such as OFF HEAT and COOL to the controller When OFF s communicated to the controller the unit controls the fan OFF There is no heating or cooling valves are closed Sampling logic The controller includes entering water temperature sampling logic which is automatically invoked during 2 pipe and 4 pipe changeover when the entering water temperature is either too cool or too hot for the desired heating or cooling For more information see Entering Water Temperature Sampling on page 43 for more information Example A 2 pipe heat cool changeover unit will not cool if the entering water temperature is too warm for cooling or if the entering water sensor is not present The unit will not heat if the entering water temperature is too cool for heating If failed the controller will close valve for one hour then reattempt sampling routine Table 31 Valves stay open Probable cause Possible Explanation Unit wiring The wiring between the controller outputs and the valve s must be present and correct for normal valve operation Unit configuration The controller must be properly configured based on the actual installed end devices and application When the unit configuration does not match the actual end devices the valves may not work correctly Diagnostic present A specific list of diagnostic affects valve operation For more information see Tracer ZN 520 Unit Controller diagnostics on pag
67. modulat ing valves itis possible for the wa ter near the entering water temperature sensor to migrate to wards ambient temperature The Tracer ZN 520 controller has a wa ter sampling feature for these ap plications When the sensed water temperature is not sufficient for the requested heat cool mode 5 F above the zone temperature for heating or 5 F below the zone temperature for cooling the con troller drives the valve fully open The controller then monitors the water temperature until the appro priate temperature is sensed or until the three minute time limit expires If the water temperature is acceptable for the requested ca pacity the unit continues normal operation If the three minute tim er expires and the water tempera ture is still unsuitable the unit closes the valve and waits one hour before invoking the sampling feature again Table 22 Water assumption chart Temperature Assumed Unit Configuration 2 pipe Heating valve 2 pipe cooling valve 2 pipe H C valve with Hot auto changeover enabled 2 pipe H C valve with auto changeover Cold disabled 1 Assumption based on absence of a valid entering water temperature Modulating Outdoor Air Operation The Tracer ZN 520 controller oper ates a modulating 3 wire floating outdoor air damper actuator ac cording to the effective occupan cy outdoor air temperature space asm re effective setpoint discharge air temperature and discharg
68. mper operation Unit configuration The controller must be properly configured based on the actual installed end devices and application When the unit configuration does not match the actual end devices the damper may not work correctly Random start observed After power up the controller always observes a random start from 5 to 30 seconds The controller remains OFF until the random start time expires Power up control wait When power up control wait is enabled non zero time the controller remains OFF until one of two conditions occurs 1 Thecontroller exits power up control wait once it receives communicated information 2 The controller exits power up control wait once the power up control wait time expires Diagnostic present A specific list of diagnostics affects outdoor air operation For more information see Tracer ZN 520 Unit Controller diagnostics on page 52 for more information Manual output test The controller includes a manual output test sequence you can use to verify output operation and associated output wiring However based on the current step in the test sequence the unit damper may not be open For more information see Manual Output Test on page 48 for more information Fan mode OFF When a local fan mode switch provided on the Trane zone sensor determines the fan operation the OFF position controls the unit OFF and damper to close UV SVPO1A EN 57
69. n about unit serial number U NID neuron identification number The NID is similar to the serial number of the unit but is specific to the identification of the Tracer ZN 520 unit controller circuit board and unit location The location identification is a customer defined clear English description of the unit s physical location This is a 27 character description including spaces of the location For example if the location identification for a unit is Conference Room 101 the ZN 520 Rover the Trane Comm 5 service tool and Tracer Summit will recognize this clear English description If location identification is not de fined it will default to the unit seri al number This unit identification tag provides some information so the user has multiple references to the unit The blank location is pro vided for field modification in case the unitis moved from the initial location 38 Location Identifier Order Serial Tagging NID Location ROOM 303 e Trane Company 182 Cotton Belt Parkway McGregor Texas 76657 Unit Identification Taq Model VUVC15011A0FACR91EE11CH100C01110 D2A012CA W99C13405 HP C 01 00 3A 50 2C 00 Ed NID Location 01 00 3A 50 2C 00 Serial Location W99C13405 Room 303 Note Fold and tear carefully along dashed removable line Figure 16 Unit identification tag Winking Winking a device causes the green status LED on the d
70. ntroller commands the fan on and the binary input remains FAEERE Normally uen open for one minute BIP is normal diagnostic YSR When the controller commands the fan on and the binary input closes BIP is active no diagnostic When inputis Open BIP is Active Defrost activated When input is Closed BIP is Normal no Defrost De energized Fan off Fan high Normally open Energized Fan high J 1 2 Fan Normallvopen De energized Fan Exhaust off Medium Exhust y 9P Energized Fan Medium Exhust on De energized Fan off TB4 1 and TB4 Generic binary De energized Output off de energized output base board Normally open 2 2 heat Energized Output on energized 1 The occupancy input applications vary for standalone and communicated instances For more information see Occupancy arbitration tables in the Appendix 2 The fan status device is normally closed during normal fan operation When the fan is off either from a fan failure or the controller commanding the fan off the binary input device opens UV SVPO1A EN 61 Appendix Unit Operation Unit Operation Based On The Effective HEAT COOL Output Table 39 Unit operation based on the effective heat cool output Effective heat cool mode output Unit Operation nvoHeatCool Application modeinput Heat cool mode input nviApplicMode nviHeatCool Fan Enabled Heating Enabled Cooling Enabled Damper Enabled Fan Enabled Heating Enabled Heating Cooling D
71. ocation 17 Location label nciBypassTime SNVT time min SCPTbypassTime 34 Local bypass time nciSpaceRHSetpt SNVT lev percent SpaceeRHSetpint RH Setpoint nciOAMinPos SNVT_lev_percent Minimum ee EEREEDEDIERIEE air position during occupied mode Note LonMark certification pending 64 UV SVPO1A EN TRANE A ppendix Timeclock Setting the Time Clock The time clock must be pro grammed for the unit to operate in occupied mode under load If not programmed the unit will run in the unoccupied mode Power must be supplied to the unitfor the time clock to be set Automatic Run Symbol Set the Time and Day The time clock Figure 36 is locat ed behind the access door on the top right of the unit 1 Press Res Reset to clear the display and any program data The day numbers 1 7 will blink 2 Hold h Hour in and toggle 1h to select military or a m p m mode If a m p m is UV SVPO1A EN The following procedure covers C setting the current time and day Q setting the program events reviewing and changing the programs and m overriding programs manually ON 3 O OFF Mo Tu We Th Fr Sa Su LED Display elected A M appears in the display Release h 3 Press and hold Run If daylight savings time is in effect 1h should appear in the display If not press 1h to clear 4 Still holding down set the current hour
72. of 3 minutes for compressor operation to pre vent short cycling of the compres sor Electric Heat Operation The Tracer ZN 520 controller sup ports 1 or 2 stages of electric heat control To control space temperature electric heat is cycled to control the discharge air temperature The rate of cycling is dependent on the load in the space and the temperature of the incoming fresh air Baseboard Heat Operation The Tracer ZN 520 controller can be configured to support one stage of baseboard heat A 2 position valve or an electric heat contactor will be energized at 2 5 F below the effective heating setpoint The baseboard heat is de energized at 1 F below the effective heating setpoint The unit will provide heating ca pacity as required regardless of the presence of baseboard heat If the unit can not maintain the space temperature the baseboard heat will come on as a secondary stage If baseboard heat is to be used as the primary source of heating the discharge air high limit should be set to a moderate temperature This will allow the ventilation air to be tempered and avoid a drafty feeling The baseboard heat will then operate as the heating capaci ty for the space In the UNOCCUPIED mode the baseboard heat and unit heating capacity are brought on simulta neously as needed to maintain the unoccupied setpoint Exhaust Fan Operation The exhaust fan is coordinated with the unit fan and outdo
73. oints include outside air temper ature entering water temperature and occupancy schedules Peer to Peer Communications On a peer to peer communication system multiple Tracer ZN 520 controllers may share data via a twisted pair communication wire without the need for a Tracer Sum mit system See Figure 5 Peer to peer communication connec tions Peer to peer communications al lows features such as master slave operation in which multiple units operate off of a single zone sensor This is typically seen in large spac es requiring multiple units The Rover service tool is required to set up peer to peer communica tions COMM5 11 e TRANE Communication Configurations Stand Alone In a stand alone configuration commands for operation are deter mined based on input from the zone sensor humidity sensor and factory or field mounted time clock See Figure 6 Typical class room unit ventilator installation U The timeclock is wired to the Tracer ZN 520 to index the unit between occupied and unoccupied modes A unit mounted analog outside air temperature sensor is used to initiate the dry bulb economizer and freeze avoidance routines U On changeover units a unit mounted analog entering water temperature sensor is used to automatically control the system in the heat cool mode These sensors are required for proper system operation and are provided as standard on stand
74. operating mode for occupied spaces or daytime operation uNocCUPIED Normal operating mode for unoccupied spaces or nighttime operation OCCUPIED STANDBY Mode used to reduce the heating and cooling demands while providing ventilation during the occupied hours when the space is vacant or unoccupied OCCUPIED BYPASS Used to temporarily place the unit into the occupied operation The occupancy mode can be hard wired to the controller via the oc cupancy binary input or communicated to the controller UV SVPO1A EN occuPiEb mode When the controller is in the occu PIED mode the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint OCCUPIED mode is the default mode of the Tracer ZN 520 control ler UNOCCUPIED Mode When the controller is in the UN OCCUPIED mode the unit attempts to maintain space temperature at the stored unoccupied heating or cooling setpoint i e config urable through Tracer Summit or the Rover service tool regardless of the presence of a hardwired or communicated setpoint When the space temperature exceeds the stored unoccupied setpoint the controller brings on 100 of the primary heating or cooling ca pacity The UNOCCUPIED mode can be ini tiated through a hardwired signal to the occupancy binary input or by a communicated request OCCUPIED STANDBY Mode The OCCUPIED STANDBY mode al lows the unit to operate at
75. or MICAT MS AM PLACW UNLESS NOTED OTvEWWw L e SENS MON SPUD aye pay Oe war TEA 1D KCI NOT OUS D fou bak Seni an Us ind CE touecust tn nn uua Oc Mant DAET MD 439 324 298 C a MEM px Gar Waan OF 4930 roor Calea r MUT amp us amp SOE w GAV LOMDUT OR WHE GUND w LOLA f t ADOC WIOPMAPION INTER 090 EMI me egre CUNKD GUT wwiw Cas via a 7 wot o TEN ower senn Pr n rh f m ML 3e a1 SOS TU BOCA 100 RE 8E i Bown VMA 3 1 LOK VALE ACTUATOR Er te CE AS Se Gee SMOKED SPOD SAIN SELECTED w MOLD SOME IMCTON MEST seccade i Coca t Bad EE GUTE Ne ACTUATOS ta ELE PE RD COP 4 UD o SPEED Fam ALAT 23 18 ARG A DD E ERF e use MW IDADE 34 1 d n Sidek sao buy ac j al b TAN AT meta EDA owe DITE TION PETAT t PN MO TRAMSFORVUA H ECTE INT cmoa EMI a1 23 4 LA 10M Eq praised xp 98 3 44 2 tow et Er Jo ca Mk 1 18 ET Send 3073 tg 3 VOX r A i Pi ze E 1 eiit 18400290 e PEE TN M ue TI red g a ret x 3 3 MA m an i e ue p i I NA 11 Ma ga ts ma inaa Ph 3 i a 2 00 tayu if dh a an r 5 om us aS ae ee 43 Gey hy fi ot Oe ap mp BE MEE Qmi gg tt LINE IA MA 4 2 mye NR sa a i 2 4 3 0 13 24 19 y eiad m El Pub a 22 4 1 Pes dict n
76. or air damper operation The exhaust fan output is energized only when the unit fan is operating and the out door air damper position is greater UV SVPO1A EN Unit Operation TRANE than or equal to the configurable exhaust enable setpoint This is useful for exhaust fans designed to offset the added economizer ventilation The exhaust fan is disabled when the outdoor air damper position drops 10 below the exhaust en able point If the exhaust fan en able setpoint is less than 1096 the Tracer ZN 520 controller energizes the exhaust fan at the enable point and disables it when the outdoor air damper closes Output Overrides Manual Output Test Manual output test allows the bi nary outputs to be energized in a predefined sequence For more in formation see Manual Output Bon page 48 for more informa tion Water Valve Override To enable quicker water balanc ing the controller allows a user to specify the desired state of all wa ter valves The values supported are C Open all valves Close all valves The valves in the system will re main open for two hours oruntil normal operation is resumed The Tracer Summit or the Rover service tool is required to access this feature Fan Status There are two ways to do fan sta tus monitoring 1 The status of the fan is reported based on the state of the binary output s dedicated to fan control The fan status is reported as HIGH or Low
77. osed indefi nitely during morning warm up until the space temperature is with in 2 F of the effective heating set point The unit runs at full capacity until setpoint is met COOL DOWN The Tracer ZN 520 controller keeps the modulating outdoor air damp er closed for up to one hour at ev ery transition from UNOCCUPIED to OCCUPIED mode when the space temperature is 3 F or more above the cooling setpoint The damper remains closed during cool down until the space temper ature is within 2 F of the effective cooling setpoint The unit runs at full capacity until setpoint is met Data Sharing LonWorks Tracer ZN 520 allows peer to peer data communication through the use of LonWork s technology Data such as space temperature set point occupancy etc can be shared from a master controller to SE a peer controller over a twisted pair of communication wire with or withoutthe presence of a front end building management system See Figure 23 Simple data shar ing application This ability al lows units to operate with the same data to prevent conflicting control Data sharing is established through the use of bindings Bindings are set up through the Rover service tool The Tracer ZN 520 controller in cludes a network variable for mas ter slave operation This variable includes all of the information re quired for the slave units to oper ate with master controller See Figure 24 More complex data
78. outine will not operate Dehumidification is possible when mechanical cooling is available the heating capacity is in the re heat position and the space rela tive humidity setpoint is valid The controller starts dehumidify ing the space when the space hu midity exceeds the humidity setpoint The controller continues to dehumidify until the sensed hu midity falls below the setpoint mi nus the relative humidity offset The controller uses the cooling and reheat coils simultaneously to dehumidify the space When de humidifying the discharge air temperature is controlled to main tain the space temperature at the current setpoint Economizing is disabled during the dehumidification mode Note While in the dehumidification mode if there is a call for capacity by the unit the zone temperature setpoint will take priority over the relative humidity setpoints DEFROST For defrost operation a sensor is wired in series with the DX cooling relay When a defrost condition is detected the condensing unit is disabled and the unit is placed in the DEFROST mode During DEFROST the condensing unit is orr the outside air damper is setto the minimum positions and the fan will continue to oper ate as continuous The unit will re main in the DEFROST mode until the senor resets at 48 F The unit will return to NORMAL operation af ter the mode is discontinued FREEZE AVOIDANCE FREEZE AVOIDANCE is used as low ambi
79. pass Damper Operation Note The Face and bypass actuator is located in the right hand end pocket of the classroom unit ventilator The Tracer ZN 520 controller actu ates a face and bypass damper to modulate a percentage of air to the face of the coil to maintain space comfort When a requested capaci ty is present the unit modulates the damperto allow more airto the face of the coil An averaging sen Sor is used on the discharge air to provide accurate capacity control Figure 18 Horizontal unit with face and bypass damper option 42 UV SVPO1A EN U nit Operation TRANE A AA A Figure 19 Vertical unit with face and bypass damper operations Upon power up the controller cal ibrates the face and bypass damp er to the full bypass position by overdriving the damper actuator During normal operation whenev er the Tracer ZN 520 controller generates a face and bypass damper position request of zero or 100 the unit calibrates the actu ator by overdriving the damper ac tuator 135 Entering Water Temperature Sampling Units with 4 pipe changeover and 2 pipe changeover require an en tering water temperature to deter mine if the appropriate water temperature is present for the re quested mode heating or cool ing This temperature may be communicated in an ICS system or hardwired to the Tracer ZN 520 UV SVPO1A EN controller for standalone applica tions When a unit uses 2 way
80. pered and avoid a drafty feeling The baseboard heat will then operate as the heating capaci ty for the space In the UNOCCUPIED mode the baseboard heat and unit heating capacity are brought on simulta neously as needed to maintain the unoccupied setpoint Exhaust Fan Operation The exhaust fan is coordinated with the unit fan and outdoor air damper operation The exhaust fan output is energized only when the unit fan is operating and the out door air damper position is greater UV SVPO1A EN Unit Operation TRANE than or equal to the configurable exhaust enable setpoint This is useful for exhaust fans designed to offset the added economizer ventilation The exhaust fan is disabled when the outdoor air damper position drops 10 below the exhaust en able point If the exhaust fan en able setpoint is less than 1096 the Tracer ZN 520 controller energizes the exhaust fan at the enable point and disables it when the outdoor air damper closes Output Overrides Manual Output Test Manual output test allows the bi nary outputs to be energized in a predefined sequence For more in formation see Manual Output Bon page 48 for more informa tion Water Valve Override To enable quicker water balanc ing the controller allows a user to specify the desired state of all wa ter valves The values supported are C Open all valves Close all valves The valves in the system will re main open
81. porarily place the unit into the occupied operation The occupancy mode can be hard wired to the controller via the oc cupancy binary input or communicated to the controller UV SVPO1A EN occuPiEb mode When the controller is in the occu PIED mode the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint OCCUPIED mode is the default mode of the Tracer ZN 520 control ler UNOCCUPIED Mode When the controller is in the UN OCCUPIED mode the unit attempts to maintain space temperature at the stored unoccupied heating or cooling setpoint i e config urable through Tracer Summit or the Rover service tool regardless of the presence of a hardwired or communicated setpoint When the space temperature exceeds the stored unoccupied setpoint the controller brings on 100 of the primary heating or cooling ca pacity The UNOCCUPIED mode can be ini tiated through a hardwired signal to the occupancy binary input or by a communicated request OCCUPIED STANDBY Mode The OCCUPIED STANDBY mode al lows the unit to operate at a heat ing or cooling setpoint between the occupied and unoccupied set points to help maintain the envi ronment while decreasing energy consumption This mode decreases the ventila tion for heating or cooling during brief periods of vacancy in the space Unit operation in this mode is similar to the occupied mode ex cept for the different heat
82. r Fan Enabled Heating Enabled Cooling Enabled Damper Enabled Fan only Any state Fan only Fan Enabled Heating Disabled Cooling Disabled Damper Enabled 1 Use of heat for supply air tempering and dehumidification remains available 2 Night purge Emergency heat and Nul modes are not supported by the Tracer ZN 520 Unit Controller If one of these modes is received by the controller it is interpreted as Auto UV SVPO1A EN 63 A ppendix Data Lists Data Lists Table 70 provides an input output listing for the Tracer ZN 520 unit controller The content of the lists conforms to both the LonMark Space Comfort Controller Functional Profile and the LonMark node object Table 40 Input output listing Rowe Tren TT p is am 1 LonMark certification pending 5 5 5 5 5 5 5s 5s 5s s s s lt S S Sj S Sj Sj Sj S S S S gt Q my amp gt J OJ OJ O 8 n wy 2 c o J e l 6s el o e l 8 a x 3g 5JJ 5J 0J SJ 5J SIST a 2 I Q J Z nl z J Q c a 5 5 6J e amp IJI 3 9 e g J m 9 5 5 23 S3I5 J H 2 oils J 9 n 0 2 0 ml g J 9 J Q 2 k 3 Se o O 3 amp o alo s o 3 m 2 Table 41 Configuration properties ncw nOuttm ENT mesec SCPTm nSendTime 63 Minimum send time nciRcvHrtBt SNVT_time_sec SCPTmaxRcvTime 48 Receive heartbeat InciLocation SNVT str asc SCPTl
83. r 5 F below the zone temperature for cooling the con troller drives the valve fully open The controller then monitors the water temperature until the appro priate temperature is sensed or until the three minute time limit expires If the water temperature is acceptable for the requested ca pacity the unit continues normal operation If the three minute tim er expires and the water tempera ture is still unsuitable the unit closes the valve and waits one hour before invoking the sampling feature again Table 22 Water assumption chart Temperature Assumed Unit Configuration 2 pipe Heating valve 2 pipe cooling valve 2 pipe H C valve with Hot auto changeover enabled 2 pipe H C valve with auto changeover Cold disabled 1 Assumption based on absence of a valid entering water temperature Modulating Outdoor Air Operation The Tracer ZN 520 controller oper ates a modulating 3 wire floating outdoor air damper actuator ac cording to the effective occupan cy outdoor air temperature space asm re effective setpoint discharge air temperature and discharge air temperature set point Default minimum damper positions are provided and can be changed for occupied and occu pied standby modes or for low speed operation The controller can also receive a communicated outdoor air damper minimum po sition from Tracer Summit A com municated minimum position from Tracer Summit has priority over all confi
84. r end pocket The mounting plate swings out of the way with the removal of a single screw to allow access to the com ponents behind the control board Figure 9 Vertical classroom unit ventilator end pocket UV SVPO1A EN The mounting plate on the hori zontal classroom unit ventila tor configuration is designed to slide out with the removal of a sin gle screw for complete access to the Tracer ZN 520 See Figure 10 Horizontal classroom unit venti lator end pocket The location of the control board on this unit con figuration allows complete access to the other components in the end pocket when the front panel is removed Figure 10 Horizontal classroom unit ventilator end pocket For additional convenience quick connects and modular wire har nesses are used on the control board and mounting plate See Figure 11 Quick connects to con trol board in the classroom unit ventilator These quick connects 1e facilitate ease of wiring devic a zone sensor to the control Bos and helps add accessibility to major components gt S gt Figure 11 Quick connects to control board in the classroom unit ventilator 23 TRANE Installation and Wiring Wiring mation All controls are wired AII sensor and input circuits are at the factory Single point at or near ground potential Do not connect any sensor or input AWARNING power zone sensor and circuit to an external g
85. r is supplied by a Separately mounted 24 VAC 90 VA transformer Q Sensor Modules a variety of analog sensors that provide temperature and optional humidity sensing and CO sensor and an operator interface to the Tracer ZN 520 for operating modes status and temperature setpoints The zone sensor may also be used when trying to locate a unit By pressing the on button on the zone sensor for 5 seconds or using the wink command in Rover the cir cuit board receives the signal caus ing the Communication LED to wink Winking allows visual identifier on the board for service technicians The Tracer ZN 520 also includes features such as a test output to manually test all of the end devices and color coded wires i e red for heating valves and blue for cooling valves to aid in the troubleshoot ing process See Manual Output Test on page 48 for more infor mation U Standard End Devices a variety of devices that help to gather information control capacity and provide ventilation are used by the Tracer ZN 520 in its control algorithm to condition the space to the desired temperature and relative humidity level See Standard End Devices on page13 for more information UV SVPO1A EN Communication Configurations Note The Tracer ZN 520 is a configured controller It will not operate without a valid downloaded configuration file The Tracer ZN 520 controller sup ports ICS
86. r more infor mation Figure 25 Black service button Yellow Comm LED The yellow Comm LED blinks at the rate the controller receives communication The yellow LED does not blink when the controller is transmitting communication data Table 25 Yellow comm LED activity continuously Yellow LED Description activity LED OFF The controller is not detecting any communication Normal for standalone applications continuously LED blinks or The controller detects flickers communication Normal for communicating applications including data sharing LED ON Abnormal condition or extremely high traffic on Green Status LED The green LED normally indicates whether or not the controller is powered on 24 VAC Table 24 Green status LED activity Green LED Description activity LED is ON Power ON normal continuously operation LED blinks 1 blink The controller is in per second manual output test mode No diagnostics present LED blinks 2 The controller is in blinks per second manual output test mode One or more diagnostics are present LED blinks 1 4 Wink mode second on 1 4 second off for 10 seconds LED OFF Power is off Controller failure Test button is pressed the link Manual Output Test The test sequence verifies output and end device operation The manual output test can be cond
87. ric heat outputs and drives all dampers and valves closed if required 2 At the beginning of step 2 the controller attempts to clear all diagnostics 3 If the unit is configured for a 3 speed fan the medium fan speed output will energize at step 3 If the unit is configured for a 2 speed fan the fan remains on high speed at step 3 4 If the unit is configured for a 3 speed fan the medium fan speed output energizes at step 3 If the unit is configured for a 2 speed fan the low fan speed output energizes at step 3 If the unit is configured for a 1 speed fan the fan remains on high speed at step 3 5 If the unit is configured for a 1 or 2 speed fan the exhaust fan output energizes on step 7 The exhaust fan output is shared with medium fan speed 6 After step 10 the test sequence performs an exit This initiates a reset and attempts to return the controller to normal operation UV SVPO1A EN 49 Troubleshooting Table 27 Test sequence for face and bypass unit configurations DX or cool or heat Face and Electric heat Outdoor air Generic Step Fan baseboard cool changeover valve bypass damper or heat valve damper hoat J1 1 J1 2 J1 3 J1 5 J1 6 J1 7 J1 8 J1 9 J1 10 J1 11 J1 12 TB4 1 1 Off Off Off Off Off NA Off On Off NA Off On Off 2 Fan high High Off Off Off NA On Off Off NA Off Off Off 3 Fan med Off Med Off Off NA On Off Off NA
88. round communication wiring is to connection be installed by the contractor Q A close coupled ground Warnina Di t all el connection is required for the arning Disconnect all elec Important All wiring must Tracer ZN 520 T trical power before servicing comply with state local and Q Table 7 Tracer ZN 520 Wiring unit to prevent injury or federal guidelines Contact the Requirements shows Tracer death due to electrical shock appropriate local agency for ZN 520 wire types and lengths furthur information Table 7 Tracer ZN 520 Wiring Important Wires for Requirements temperature sensors Use copper conductors only The use of aluminum or other incorrect types of wire communication lines 24 VAC Application Length may result in overheating and EDU quM v iawo to inputs should not be bundle ontact Closure 1000 ft and equipment damage with or run near high voltage wiring 24 VAC 16 22 AwG UP to 1000 ft U Power wiring must be L separated from the Tracer Thermostat 16 22 AwG UP to ZN 520 and all low voltage 1000 ft wires External input wires Zone U p to should be run in separate Sensor 1622awe 08 ft conduits from high voltage wires Communications or equivalent 5000 ft U Wires connected to pin headers should be formed and routed so as to cause minimum strain Power A CAUTION on the Tracer ZN 520 connector The Tracer ZN 520 controller is powered by 24 VAC See Table 7 Caution To prevent
89. rror between the space temperature and the set point is three degrees If the same error exists for one minute 60 sec onds the integration term is 3 F 60 Sec or 180 F Sec The Tracer ZN 520 Unit Control ler changes from heating to cool ing and cooling to heating when the integration term exceeds 900 F Sec Along with satisfy ing the integration for heating and cooling changeover the measured space temperature must fall out side the setpoint range This means the space temperature must be greater than the active 40 cooling setpoint or lower than the active heating setpoint Example If the cooling setpoint is 75 F and the heating setpoint 70 F any space temperature greater than 75 F or less than 70 F is outside the setpoint range Once the integration term is satis fied and the space temperature is outside the setpoint range the controller changes modes Howev er before the unit s heating or cooling capacity ramps up the controller checks to make sure it is capable of heating or cooling For some units heating and cool ing capability exists with local re sources such as electric heat or perature is 900 F Sec Integra tion only begins once the heating and cooling capacity is equal to 096 or the discharge air temperature is being limited by the discharge air temperature control limits See Figure 17 Heat Cool Changeover logic Time gt x e d Unit M
90. sharing application For more information on establish ing bindings see the Rover service tool manual For a complete listing on shared points see Appendix Data Lists on page64 zm UV SVPO1A EN TRANE Unit Operation ie Figure 24 More complex data sharing application UV SVPO1A EN 47 Unit Operation TRANE Power Up When 24 VAC is initially applied to the controller the following se quence of events occurs U Green status LED turns on Q All outputs are controlled orr Q The controller reads input values to determine initial values C Random start timer expires 5 to 30 seconds Q When POWER UP CONTROL WAIT is enabled the controller waits 0 120 seconds depending on configuration to allow ample time for communicated control data to input If the controller does not receive communi cated information standalone control is assumed Q All modulating valves and dampers calibrate closed C NORMAL operation begins Occupancy The valid occupancy modes for the Tracer ZN 520 controller are occuPiED Normal operating mode for occupied spaces or daytime operation uNocCUPIED Normal operating mode for unoccupied spaces or nighttime operation OCCUPIED STANDBY Mode used to reduce the heating and cooling demands while providing ventilation during the occupied hours when the space is vacant or unoccupied OCCUPIED BYPASS Used to tem
91. space temperature is 3 F or more above the cooling setpoint The damper remains closed during cool down until the space temper ature is within 2 F of the effective cooling setpoint The unit runs at full capacity until setpoint is met Data Sharing LonWorks Tracer ZN 520 allows peer to peer data communication through the use of LonWork s technology Data such as space temperature set point occupancy etc can be shared from a master controller to SE a peer controller over a twisted pair of communication wire with or withoutthe presence of a front end building management system See Figure 23 Simple data shar ing application This ability al lows units to operate with the same data to prevent conflicting control Data sharing is established through the use of bindings Bindings are set up through the Rover service tool The Tracer ZN 520 controller in cludes a network variable for mas ter slave operation This variable includes all of the information re quired for the slave units to oper ate with master controller See Figure 24 More complex data sharing application For more information on establish ing bindings see the Rover service tool manual For a complete listing on shared points see Appendix Data Lists on page64 zm UV SVPO1A EN TRANE Unit Operation ie Figure 24 More complex data sharing application UV SVPO1A EN 47 Important When viewing the
92. speed is orr See Manual Output Test on page48 for more information During the UNOCCUPIED mode the unit fan is controlled orr When ca pacity is required to maintain the unoccupied heating or cooling set point the unit fan is controlled to high speed regardless of a hard wired or communicated fan speed Table 21 Absolute two speed fan switch points Fan Speed Absolute Change Temperature Error Low to High High to Low Fan Off Delay When a heating output is con trolled off the Tracer ZN 520 Unit Controller automatically holds the fan on for an additional 30 seconds This 30 second delay gives the fan time to blow off any residual heat from the heating Source such as a steam coil When the unit is heating the fan off de lay is normally applied to control the fan otherwise the fan off de lay does not apply Fan Start On High Speed On atransition from off to any oth er fan speed the Tracer ZN 520 Unit Controller automatically starts the fan on high speed and runs the fan at high speed for 0 5 41 TRANE seconds This provides the ample torque required to start all fan mo tors from the off position Exhaust fan damper operation This binary point is a shared point with medium fan speed For this point to be used for exhaust con trol the controller must be config ured for a 1 or 2 speed fan The exhaust fan damper is coordinated with the unit fan and outdoor damper operation
93. ss damper BYPASS DX electric heat OFF Baseboard heat OFF Non latching Communicated or manual reset Entering Water Temp Failure Fan ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper E NABLED DX electric heat ENABLED Baseboard heat OFF Non latching Communicated or manual reset Discharge Air Temp Limit Fan OFF Valves OPEN Outdoor air damper CLOSED Face bypass damper BYPASS DX electric heat OFF Baseboard heat OFF Latching Auto reset once within 24hrs If safety generates a diagnostic more than once a communi cated or manual reset will be necessary Discharge Air Temp Failure Fan OFF Valves CLOSED Outdoor air damper CLOSED Face bypass damper BYPASS DX electric heat OFF Baseboard heat OFF Non latching Communicated or manual reset Outdoor Air Temp Failure Fan ENABLED Valves ENABLED Outdoor air damper MINIMUM POSITION Face bypass damper ENABLED DX electric heat ENABLED Baseboard heat ENABLED Non latching Communicated or manual reset UV SVPO1A EN 52 Troubleshooting TRANE Table 28 Tracer ZN 520 Unit Controller diagnostics Diagnostic Unit Response Latching non latching Reset Humidity Input Failure Fan ENABLED Valves ENABLED Outdoor air damper ENABLED Face bypass damper ENABLED DX electric heat ENABLED Basebo
94. stic is generated Local Setpoint Failure If the hardwired setpoint input to the Tracer ZN 520 controller is present and then becomes invalid a local setpoint failure diagnostic is generated Generic Temperature Failure If the Tracer ZN 520 has validated a generic temperature input and then the input becomes invalid a generic temperature input failure diagnostic occurs Invalid Unit Configuration If the Tracer ZN 520 has been con figured improperly or loses its configuration an invalid unit con figuration diagnostic is generated The unit must be re configured with a valid configuration to cor rect this problem 51 Diagnostics Troubleshooting TRANE Table 28 Tracer ZN 520 Unit Controller diagnostics Face bypass damper BYPASS DX electric heat OFF Baseboard heat OFF gt Latching non Diagnostic Unit Response 9 Reset latching Fan OoFF s Auto reset once within 24hrs If Valves OPEN safet nerates a diagnostic Low Coil Temperature Outdoor air damper CLOSED Ire gne Latching more than once a communi Detect Face bypass damper BYPASS catod aciamielTusat will be DX electric heat oFF KP S ni Baseboard heat OFF 4 Fan OFF Valves CLOSED E P utdoor air damper CLOSED i i Low Air Flow Fan Failure Ditdoorair damp Latching Communicated or manual reset Space Temperature Failure Fan OFF Valves CLOSED Outdoor air damper CLOSED Face bypa
95. switch points Fan Speed Absolute Change Temperature Error Low to High High to Low Fan Off Delay When a heating output is con trolled off the Tracer ZN 520 Unit Controller automatically holds the fan on for an additional 30 seconds This 30 second delay gives the fan time to blow off any residual heat from the heating Source such as a steam coil When the unit is heating the fan off de lay is normally applied to control the fan otherwise the fan off de lay does not apply Fan Start On High Speed On atransition from off to any oth er fan speed the Tracer ZN 520 Unit Controller automatically starts the fan on high speed and runs the fan at high speed for 0 5 41 TRANE seconds This provides the ample torque required to start all fan mo tors from the off position Exhaust fan damper operation This binary point is a shared point with medium fan speed For this point to be used for exhaust con trol the controller must be config ured for a 1 or 2 speed fan The exhaust fan damper is coordinated with the unit fan and outdoor damper operation The exhaust output is energized only when the unit fan is operating and the out door damper position is greater than or equal to the configurable exhaust enable point The exhaust fan output is disabled when the outdoor air damper position drops 1096 below the exhaust enable point If the enable point is less than 1096 the unit turns on at the ena
96. t is one of the following C Occupied cooling setpoint C Occupied standby cooling setpoint C Unoccupied cooling setpoint The controller uses the measured space temperature the active cooling setpoint and discharge air temperature along with the con trol algorithm to determine the re quested cooling capacity of the unit 0 10096 The outputs are con trolled based on the unit configu ration and the requested cooling capacity UV SVPO1A EN Heating Operation During the HEATING mode the Tracer ZN 520 controller attempts to maintain the space temperature at the active heating setpoint Based on the controller s occupan cy mode the active heating set point is one of the following C Occupied heating setpoint C Occupied standby heating setpoint Unoccupied heating setpoint The controller uses the measured space temperature the active heating setpoint and discharge air temperature along with the con trol algorithm to determine the re quested heating capacity of the unit 0 10096 The outputs are con trolled based on the unit configu ration and the requested heating capacity Fan Operation For multiple fan speed applica tions the Tracer ZN 520 controller allows separate defaultfan speeds to be configured for heating and cooling modes When the fan mode switch is in the AuTO posi tion or no hardwired input exists the fan operates at the configured default fan speed i e HIGH
97. ture Range Output Characteristics Power consumption Drift Rate 25596 full scale over four years Uu pln g1 n n E Slo olojo 0 Ej 5 FE j o Qu Quj u lt 0 5 0 5 5 ala m m m a 0 ojo Q 3 3 3 D o ar ct m e 20 amps at 120 240 vac 3 4 hp at 120 vac 1 1 2 hp at 240 vac 20 amps 28 vdc DPDT Terminals 0 25 quick connect Contact Rating Contact material Silver Cadium Oxide Coil 24 vac 2 7 va UV SVPO1A EN Standard End Devices Table 2 End Device Specifications Type Primary Voltage Description N E C Class 2 24 vac at 90 va M anual reset 4amp fuse in 24 volt circuit Control Transformer Secondary voltage UV SVPO1A EN 17 e TRANE Specifications Dimensions Tracer ZN 520 board and mounting hardware e Height 5 25 inches 133 mm e Width 5 50 inches 140 mm e Depth 2 25 inches 57 mm Power Requirements e 18 to 32 VAC 24 VAC nominal e 50 or 60 Hz e 570mA AC Operating Environment e 32 to 140 F 0x to 60 C e 5 to 95 relative humidity non condensing Storage Environment e 40 to 185 F 40 to 85 C 5 to 95 relative humidity non condensing Agency Listings e UL and CUL 916 Energy Man agement System Agency Compliance IEC 1000 4 2 ESD IEC 1000 4 4 EFT IEC 1000 4 5 Surge 18 Installation and Wiring
98. ty rated 40 F 250 F 40 C 120 C Fan status 0 07 36 F 2 F Trip Temperature 2 C 1 11 C 44 F 3 F Release Temperature 6 67 C 1 67 C Pilot Duty 24 VAC L 120 VAC 240 VAC Thermistor 10 KOhms 77 F 1 8 F 25 C 1 C Rating Auto Reset A LRA OutsideAir Sensor discharge AirSensor Entering Water Temperature Sensor Unit Mounted Zone Return air Temperature Sensor UV SVPO1A EN 13 Standard End Devices Table 2 End Device Specifications EB Face and Bypass Actuator Three point floating Ambient Temperature Rating 32 F to 122 F w Face BET IMO Drive Time 80 110 seconds 95 degree stroke Temperature Water 200 F maximum 14 UV SVPO1A EN Standard End Devices Table 2 End Device Specifications a Power Consumption 4 4 VA SPDT dry contacts silver cadmium oxide fr Zone sensor Zone Sensor Wiring Size And Maximum Lengths 16 22 AWG up to 200 feet UV SVPO1A EN 15 Table 2 End Device Specifications Device Humidity Sensor 16 Standard End Devices Characteristic Description Polymer capacitive Accuracy 5 over 20 95 RH 779F 0 to 99 RH O F to 1409F 24VDC 4 to 20 MA for 0 100 RH Operating Temperature Range Max Supply Voltage Output Characteristics Drift Rate Less than 1 per year Accuracy 100ppm full scale 0 2000 ppm 59 F to 959F 24VAC 0 10 VDC for 0 2000 ppm 10VA Operating Tempera
99. uct ed to verify output wiring and actu ator operation without using the Rover service tool by pressing the test button Figure 26 Blue test button Many service calls are initiated due to unit diagnostics so the test se quence attempts to clear unit diag nostics and restore normal unit operation prior to testing the out puts If the diagnostics remain after an attempt to clear diagnostics the status LED lights in a two blink pat tern indicating the diagnostic con dition is still present UV SVP01A EN Troubleshooting TRANE If a two blink pattern remains after an attempt to clear diagnostics the diagnostic condition is still present and may affect the manual output test The diagnostic must then be cleared using another method See Resetting Diagnostics on page 54 for more information Test Procedure The procedure for testing is 1 Pressand hold the Test button for at least two seconds then release the button to start the test mode 2 When manual output test mode begins the controller turns off all outputs and cali brates modulating end devices closed 3 Press the Test button once to advance through the test sequence Note To help ensure accurate testing do not press the test button more than once per second Table 26 Test sequence for non face and bypass unit configurations Alternatively the manual output test can be controlled over the communications network by using
100. unications link is not connected in the factory Commu nications should be wired to the wall mounted sensor UV SVPO1A EN Note It may be necessary to subdivide the zone with multiple units to ensure adequate control and comfort throughout the space The following are typical areas where the zone sensor should NoT be mounted C Near drafts or dead spots e g behind doors or corners Near hot or cold air ducts a Near radiant heat e g heat E from appliances or the sun Near concealed pipes or chimneys U On outside walls or other non conditioned surfaces or In air flows from adjacent zones or other units 25 Installation and Wiring Humidity and CO Sensors Humidity and CO sensors should be mounted in a similar location as the zone sensor WIRING TERMINALS POWER PORT er Figure 14 Relative humidity sensor WIRING P rar Figure 15 CO Sensor 26 VIFW WITH ENVER RFMIIVET UV SVPO1A EN Typical Wiring Diagram Wall M ounted Zone Sensor KOA tt ur Ract Comics w n 8 a j UV SVPO1A EN 27 Typical Wiring Diagram Unit Mounted Zone Sensor 28 UV SVPO1A EN U Typical Wiring Diagram Unit Mounted Switch Wall Mounted Sensor MX t AL ORLE MET A PAET VI Wei MADOMAL CLE CIKA MC SA av a 2 UMER KOCSIS NECDUMENDEO PELD EI E tue NETTE
101. y cycling power to the controller By using a building automation system U D D LO By using the Rover service tool UV SVPO1A EN U By cycling the fan switch from off to any speed setting Automatically The Tracer ZN 520 Unit Control ler includes an automatic diagnos tic reset function This function attempts to automatically recover a unit when the Low Coil Temper ature Detection diagnostic occurs When this diagnostic occurs the controller responds as defined in Table 28 Tracer ZN 520 Unit Controller diagnostics After the controller detects the Low Coil Temperature Detection diagnostic the unit waits 30 min utes before invoking the automatic diagnostic reset function The au tomatic diagnostic reset function clears the Low Coil Temperature Detection diagnostic and attempts to restore the controller to normal operation The controller resumes normal operation until another di agnostic occurs If a Low Coil Temperature Detec tion diagnostic recurs within 24 hours after an automatic diagnos tic reset you must manually reset the diagnostic See other possible methods for resetting diagnostics in this section Manual output test The test button on the controller may be used either during installa tion to verify proper end device operation or during troubleshoot ing When depressed the Test but ton the controller exercises all outputs in a predefined sequence The first and last steps of th

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