Trane ZN.520 manual

UV-SVP01A-EN Installation Owner Diagnostics Tracer ® ZN.520 for Classroom Unit Ventilator[...]

UV-SVP01A-EN 5 Installation of New Units 1. Follow all instruction for installation of classroom unit ventilators as detailed in UV- IOM-1 (Installation Operation Maintenance manual). 2. Disconnect power or disable the circuit breaker to unit. 3. Run communication link wire when required. (See wiring diagram in the unit). 4. Install zone sensor whe[...]

6 UV-SVP01A-EN 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. Green Status LED turns on. 2. All outputs are controlled Off. 3. The controller reads input val- ues to determine in[...]

UV-SVP01A-EN 7 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 equipment, inc[...]

8 UV-SVP01A-EN 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 a s the unit heating coil. 3. Units with face bypass dampers cannot actively dehumidify. Table 1: Tracer™ ZN.520 Unit Controller features and [...]

UV-SVP01A-EN 9 Controller Circuit Board Features Figure 2: Tracer ZN.520 unit controller circuit board Communications Zone Sensor Connections Power Generic Auto Test Button Service Button and LED Communications LED Status LED[...]

10 UV-SVP01A-EN Controller Features Each Tracer ZN.520 unit controller circuit board is equipped with en- hancements to help facilitate ser- vice, testing, and diagnosis. Each board has q Manual test button, q Status LED, q Communication status LED, q Service button, q Quick terminal connectors, and q Easy to read screen printing. (See Figure 1: ?[...]

UV-SVP01A-EN 11 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 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 usi[...]

12 UV-SVP01A-EN 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 ”) q The timeclock is wired to the Tracer ZN.520 to in[...]

UV-SVP01A-EN 13 Table 2: End Device Specifications Device Characteristic Description Fan Status Switch Material Contact Blade—Pilot duty rated Operating Temperature Range -40°F/250°F (-40°C/120°C) Contact Form SPST-NO Preset Fan status - 0.07” Low Temperature Detection Switch (Freezestat) Trip Temperature: 36°F ± 2°F (2°C + - 1.11°C) R[...]

14 UV-SVP01A-EN Outside Air Actuator Description Three-point floating with spring return Ambient Temperature Rating -25°F to 125°F Power Consumption 5 VA Torque 35 in-lbs. Drive Time 90 seconds, 95 degree stroke Face and Bypass Actuator Description Three-point floating Ambient Temperature Rating 32°F to 122°F Power Consumption 3 VA Torque 35 in[...]

UV-SVP01A-EN 15 Standard End Devices 3-way Control Valve Description Three-point modulating Ambient Temperature Rating 140°F at 95% relative humidity Drive Time 50 seconds Max Pressure 400 psi water Close Off Varied by size and Cv Temperature Water 200°F maximum Time clock Size 2.83'' x 4.0'' x 2.06'' Power Consumpti[...]

16 UV-SVP01A-EN Standard End Devices Humidity Sensor Sensing Element Polymer capacitive Sensing Element Accuracy: ± 5% over 20-95% RH @ 77ºF Range 0 to 99% RH Operating Temperature Range 0°F to 140ºF Max Supply Voltage 24VDC Output Characteristics 4 to 20 MA for 0-100% RH Drift Rate Less than 1% per year CO 2 Sensor Sensing Element Accuracy: ±[...]

UV-SVP01A-EN 17 Standard End Devices Control Transformer Type N.E.C. Class 2 Primary Voltage 120 vac Secondary voltage 24 vac at 90 va Manual reset 4amp fuse in 24-volt circuit Table 2: End Device Specifications Device Characteristic Description[...]

18 UV-SVP01A-EN Specifications Dimensions Tracer ZN.520 board and mounting hardware: • Height: 5.25 inches (133 mm.) • Width: 5.50 inches (140 mm) • Depth: 2.25 inches (57 mm) Power Requirements • 18 to 32 VAC (24 VAC nominal) • 50 or 60 Hz • 570 mA AC Operating Environment • 32° to 140°F (0× to 60°C) • 5% to 95% relative humidi[...]

UV-SVP01A-EN 19 Binary Inputs Each binary input associates an in- put signal of 0 VAC with open con- tacts and 24 VAC with closed contacts. Table 3: Binary inputs (typically 24 mA AC) Description Terminals Terminal Function Binary input 1 (BI 1) J2-1 24 VAC J2-2 Input Binary input 2 (BI 2) J2-3 24 VAC J2-4 Input Binary input 3 (BI 3) J2-5 24 VAC J2[...]

20 UV-SVP01A-EN 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. Generic/baseboard Heat Binary Output Table 4: Binary outputs Description Terminals Output Rating Load Energized Load De-energized Fan high J1-1 12[...]

UV-SVP01A-EN 21 Analog Inputs Table 6: Analog inputs Description Terminals Function Range Zone TB3-1 Space temperature input 5 ° to 122 ° F (-15 ° to 50 ° C) Ground TB3-2 Analog ground NA Set TB3-3 Setpoint input 40 ° to 115 ° F (4.4 ° to 46.1 ° C) Fan TB3-4 Fan switch input 4821 to 4919 Ω (Off) 2297 to 2342 Ω (Auto) 10593 to 10807 Ω [...]

22 UV-SVP01A-EN Mounting 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 ci[...]

UV-SVP01A-EN 23 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 ventilator end pocket ”) The mounting plate swings out of the way with the removal of a single screw to allow access to the com- pon[...]

24 UV-SVP01A-EN Wiring Warning! Disconnect all elec- trical power before servicing unit to prevent injury or death due to electrical shock. Use copper conductors only. The use of aluminum or other incorrect types of wire may result in overheating and equipment damage. Caution: To prevent damage to the unit ventilator, refer to the diagram provided [...]

UV-SVP01A-EN 25 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- point is achieved across the space, not just near the unit it[...]

26 UV-SVP01A-EN Installation and Wiring Humidity and CO 2 Sensors Humidity and CO 2 sensors should be mounted in a similar location as the zone sensor. Figure 14: Relative humidity sensor Figure 15: CO 2 Sensor[...]

UV-SVP01A-EN 27 Typical Wiring Diagram—Wall Mounted Zone Sensor[...]

28 UV-SVP01A-EN Typical Wiring Diagram—Unit Mounted Zone Sensor[...]

UV-SVP01A-EN 29 Typical Wiring Diagram— Unit Mounted Switch, Wall Mounted Sensor[...]

30 UV-SVP01A-EN Input/Output Summary Input/Output Summary The following lists all possible bi- nary and analog inputs and out- puts available for the classroom unit ventilator applications. Some of the points listed may be mutual- ly exclusive and some are optional. (See Table 8: Input and output summary ) Most binary inputs and outputs are wired f[...]

UV-SVP01A-EN 31 Input/Output Summary Analog Inputs Zone Temperature Setpoint Fan Speed Entering Water Temperature Discharge Air Temperature Outdoor Air Temperature/ Generic Generic/Humidity/CO2 (4- 20mA) Table 8: Input and output summary Input Description[...]

32 UV-SVP01A-EN 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. Trane configures the Tracer ® ZN.520 Unit Controller at the fac- tory per the selected unit configu- ration. The[...]

UV-SVP01A-EN 33 Binary Outputs 1 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). Table 10: Binary output summary Binary ou[...]

34 UV-SVP01A-EN Configuration Binary Inputs 1 1. Trane Rover service tool uses the unit type to determine and download the proper default binary input configuration. Analog Inputs 1 1. Trane Rover service tool uses the unit type to determine and download the proper default analog input configuration. 2. Analog input 3 (AI 3) configured as generic t[...]

UV-SVP01A-EN 35 Configuration Fan Configuration End Device Configurations 1. The exhaust fan is energized when the outdoor air damper is equal to or greater than the exhaust fan enable point, and the ex haust fan is turned off when the outdoor air damper is 10% less than the exhaust fan enable point. 2. Varies with unit configuration. Table 13: Fan[...]

36 UV-SVP01A-EN Configuration Setpoints 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 1. The low limit is the temperature at which the controller shuts down the unit to prevent the coil from freezing. 2. The co[...]

UV-SVP01A-EN 37 Configuration Occupied Bypass Timer 1. The occupied bypass timer is used for timed override applications. Power-Up Control Wait Maintenance Timers Table 18: Bypass timer range Default Valid range Occupancy bypass timer 1 120 Minutes 0 to 240 minutes (1 minute resolution) Table 19: Control wait timer Default Valid range Power up cont[...]

38 UV-SVP01A-EN Location Identifier Unit Identification Tag The unit identification 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[...]

UV-SVP01A-EN 39 Power-Up When 24 VAC is initially applied to the controller, the following se- quence of events occurs: q Green status LED turns ON . q All outputs are controlled O FF . q The controller reads input values to determine initial values. q Random-start timer expires (5 to 30 seconds). q When P O W E R - U P C ON T R O L W A I T is enab[...]

40 UV-SVP01A-EN 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 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 [...]

UV-SVP01A-EN 41 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 [...]

42 UV-SVP01A-EN Unit Operation 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 [...]

UV-SVP01A-EN 43 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%,[...]

44 UV-SVP01A-EN Unit Operation 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 be[...]

UV-SVP01A-EN 45 Unit Operation 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 10%, the Tracer [...]

46 UV-SVP01A-EN Unit Operation O FF due to a safety or command. The controller enters the F R E EZE A V OI DAN C E mode when an out- door air temperature is present (communicated or hardwired) and it is below the freeze avoidance set- point (configurable). The controller disables freeze avoidance when the outdoor air temperature rises 3°F above th[...]

UV-SVP01A-EN 47 Unit Operation Figure 24: More complex data sharing application[...]

UV-SVP01A-EN 39 Power-Up When 24 VAC is initially applied to the controller, the following se- quence of events occurs: q Green status LED turns ON . q All outputs are controlled O FF . q The controller reads input values to determine initial values. q Random-start timer expires (5 to 30 seconds). q When P O W E R - U P C ON T R O L W A I T is enab[...]

40 UV-SVP01A-EN 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 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 [...]

UV-SVP01A-EN 41 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 [...]

42 UV-SVP01A-EN Unit Operation 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 [...]

UV-SVP01A-EN 43 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%,[...]

44 UV-SVP01A-EN Unit Operation 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 be[...]

UV-SVP01A-EN 45 Unit Operation 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 10%, the Tracer [...]

46 UV-SVP01A-EN Unit Operation O FF due to a safety or command. The controller enters the F R E EZE A V OI DAN C E mode when an out- door air temperature is present (communicated or hardwired) and it is below the freeze avoidance set- point (configurable). The controller disables freeze avoidance when the outdoor air temperature rises 3°F above th[...]

UV-SVP01A-EN 47 Unit Operation Figure 24: More complex data sharing application[...]

48 UV-SVP01A-EN Important! When viewing the 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 Black Service Push Button Note: If the Service push button is hel[...]

UV-SVP01A-EN 49 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 pag e 54.for more information.) Test Procedure The procedure for testing is: 1. Press a[...]

UV-SVP01A-EN 50 T roubleshooting . 1. Upon entering manual output test mode, the controller turns off all fan outputs and drives all dampers and valves closed (if req uired). 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[...]

UV-SVP01A-EN 51 T roubleshooting Safeties Freeze Protection The Tracer ZN.520 controller has two methods of 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 3 5 ° F . When this device opens, a “Low Coil Temp Detect” diagnostic is generated. 2. Usi[...]

UV-SVP01A-EN 52 T roubleshooting Diagnostics Table 28: Tracer™ ZN.520 Unit Controller diagnostics Diagnostic Unit Response Latching/non- latching Reset Low Coil Temperature Detect 2 Fan— O F F Valves— O P E N Outdoor air damper— C L O S E D Face bypass damper— B Y P A S S DX/electric heat— O FF Baseboard heat— O FF Latching Auto reset[...]

UV-SVP01A-EN 53 T roubleshooting Humidity Input Failure 4 Fan— E N A B L E D Valves— E NA B L E D Outdoor air damper— E NA B L E D Face bypass damper— E NA B L E D DX/electric heat— E NA B L E D Baseboard heat— E NA B L E D Non-latching Communicated or manual reset CO 2 Sensor Failure 4 Fan— E N A B L E D Valves— E NA B L E D Outdoo[...]

UV-SVP01A-EN 54 T roubleshooting Note 1 : The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics. Note 2 : 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 3 : When the entering wate[...]

UV-SVP01A-EN 55 T roubleshooting 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, Tabl[...]

UV-SVP01A-EN 56 T roubleshooting Valves Table 30: Valves stay closed 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. Random-start observed After power-up, the controller always observes a random-start from 5 to 30 seconds. The controll[...]

UV-SVP01A-EN 57 T roubleshooting DX/Electric Heat Outside Air Damper 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 [...]

UV-SVP01A-EN 58 T roubleshooting Requested mode O FF You can communicate a desired operating mode (such as O FF , H E A T , and C O O L ) to the controller. When O FF is communicated to the controller, the unit controls the fan O FF . There is no heating or cooling (valves are closed). Freeze avoidance When the fan is O FF and the outdoor air tempe[...]

UV-SVP01A-EN 59 Replacing Circuit Boards Tracer ZN.520 Unit Controller Replacement 1. Disconnect power or disable the circuit breaker to unit. 2. Remove bad or questionable Tracer ZN.520 controller cir- cuit board. 3. Install controller in the unit with the heat-sink placement at the top of the control box. (See page 32). 4. Connect the power to th[...]

60 UV-SVP01A-EN Hardwired Setpoint Adjustment Fan Switch Resistance Values Hardwired Thermistor Values Table 35: Hardwired setpoint adjustment Resistance ( Ω ) Setpoint (Deg F) 889.4 50 733.6 58 577.9 66 500 70 422.1 74 344.2 78 266.4 82 188.5 86 110.6 90 Table 36: Resistance values Resistance ( Ω ) Switch Position 16,300 High 10,700 Low 2,320 [...]

UV-SVP01A-EN 61 Binary Configuration 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 contr oller commanding the fan [...]

62 UV-SVP01A-EN Appendix—Unit Operation Unit Operation Based On The Effective H E A T / C O O L Output Table 39: Unit operation based on the effective heat/cool output Application mode input (nviApplicMode) Heat/cool mode input (nviHeatCool) Effective heat/ cool mode output (nvoHeatCool) Unit Operation Auto Auto Determined by controller Fan—Ena[...]

UV-SVP01A-EN 63 Appendix—Unit Operation cont. 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. Cool Any state Cool Fan—Enabled Hea[...]

64 UV-SVP01A-EN Appendix—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. 1. LonMark certification pending Note 1 : LonMark certification pending Table 40 Input/output[...]

UV-SVP01A-EN 65 Appendix—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 unit for the time clock to be set. The following procedure covers: q setting the current time and day q sett[...]

66 UV-SVP01A-EN Appendix—Timeclock 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 unoccupi[...]

UV-SVP01A-EN 67 Appendix—Timeclock To switch the load permanently OFF , press the key a third time. [O] appears in the display. To return to automatic (pro- grammed) operation, press the key a fourth time. Run ¹ appears in the display. NOTE: The Main Power Disconnect switch is located on the lower right side of the unit behind the right front ca[...]

68 UV-SVP01A-EN Appendix—Location Identifier This area provided for the removable tag.[...]

UV-SVP01A-EN 69 Location Identifier[...]

70 UV-SVP01A-EN Location Identifier[...]

UV-SVP01A-EN 71 Location Identifier[...]

Since The Trane Company has a policy of continuous product improvement, it reserves the right to change design and specifications without notice. Literature Order Number UV-SVP01A-EN File Number SV-TD-UV-000-SVP01A-EN-0700 Supersedes New Stocking Location La Crosse The Trane Company Worldwide Applied Systems Group LaCrosse, Wisonsin www.trane.com A[...]