Instruction/ maintenance manual of the product ZN.520 Trane
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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.
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.
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.
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.
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 Comm.
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.
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.
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.
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.
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.
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.
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 140.
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 Spe.
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.
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 Term.
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.
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.
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.
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.
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.
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.
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.
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.
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- 20.
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.
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).
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.
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.
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.
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 .
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.
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).
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.
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.
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.
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.
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.
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.
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).
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).
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.
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.
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.
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.
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.
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.
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).
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.
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.
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.
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 .
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 Val.
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.
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.
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.
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.
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.
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).
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.
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.
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.
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 (nviApp.
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.
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.
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.
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.
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.
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.
An important point after buying a device Trane ZN.520 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Trane ZN.520 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Trane ZN.520 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Trane ZN.520 you will learn all the available features of the product, as well as information on its operation. The information that you get Trane ZN.520 will certainly help you make a decision on the purchase.
If you already are a holder of Trane ZN.520, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Trane ZN.520.
However, one of the most important roles played by the user manual is to help in solving problems with Trane ZN.520. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Trane ZN.520 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
