Installation Owner Diagnostics Tracer® ZN.
Start-up Procedures Installation of New Units 1. Follow all instruction for installation of classroom unit ventilators as detailed in UVIOM-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 when required. (See wiring diagram in the unit and zone sensor submittals). 5. Reapply power. 6.
Start-up Procedures Power Up Sequence Manual output test can be initiated at any time in the power up sequence or during normal operation. When 24 VAC power is initially applied to the controller, the following sequence occurs: 1. Green Status LED turns on. 2. All outputs are controlled Off. 3. The controller reads input values to determine initial values. 4. Standalone control is assumed unless occupancy data is communicated. 5. Random start timer expires (5 to 30 seconds, random). 6.
General Information Tracer® ZN.520 Overview The Trane ® Tracer ® ZN.520 controller is a factory-installed and commissioned, direct-digital controller (DDC) offering for classroom unit ventilator systems. (See Figure 1: “Tracer ZN.520 Control Board”) The Tracer ZN.520 can also be applied to other Trane ® interoperable HVAC equipment, including the fan coil and blower coil products. (For more information see,Table 1: Tracer™ ZN.
General Information Table 1: Tracer™ ZN.
Controller Circuit Board Features Power Generic Auto Test Button Status LED Communications LED Service Button and LED Communications Zone Sensor Connections Figure 2: Tracer ZN.
Controller Features Each Tracer ZN.520 unit controller circuit board is equipped with enhancements to help facilitate service, 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: “Tracer ZN.520 Control Board”). Service The Trane Tracer ZN.520 unit controller is serviced using Rover®, the ICS software service too. Rover is designed to support the Tracer ZN.
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 supports ICS and peer-to-peer communications as well as standalone operation. A number of control 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.
Communication Configurations Stand-Alone Communication Interface In a stand-alone configuration, commands for operation are determined based on input from the zone sensor, humidity sensor, and factory- or field-mounted timeclock.(See Figure 6: “Typical classroom unit ventilator installation”) q The timeclock is wired to the Tracer ZN.520 to index the unit between occupied and unoccupied modes.
Standard End Devices Table 2: End Device Specifications Device Fan Status Switch Low Temperature Detection Switch (Freezestat) Characteristic Description 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” Trip Temperature: 36°F ± 2°F (2°C + - 1.11°C) Release Temperature 44°F ± 3°F (6.67°C + - 1.67°C) Pilot Duty (24 VAC) 120 VAC 240 VAC FLA 10.0 5.0 LRA 60.0 30.
Standard End Devices Table 2: End Device Specifications Device Outside Air Actuator Face and Bypass Actuator 2-way Control Valve 14 Characteristic Description 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 Description Three-point floating Ambient Temperature Rating 32°F to 122°F Power Consumption 3 VA Torque 35 in-lbs.
Standard End Devices Table 2: End Device Specifications Device 3-way Control Valve Time clock Characteristic Description 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 Size 2.83'' x 4.0'' x 2.06'' Power Consumption 4.
Standard End Devices Table 2: End Device Specifications Device Humidity Sensor CO 2 Sensor Characteristic 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 Sensing Element Accuracy: ± 100ppm full scale Range 0-2000 ppm Operating Temperature Range 59°F to 95ºF Supply Voltage 24VAC Out
Standard End Devices Table 2: End Device Specifications Device Characteristic Type N.E.C.
Installation and Wiring Specifications Dimensions Tracer ZN.520 board and mounting hardware: • Height: 5.25 inches (133 mm.) • Width: 5.50 inches (140 mm) • Depth: 2.
Installation and Wiring Binary Inputs Each binary input associates an input signal of 0 VAC with open contacts and 24 VAC with closed contacts.
Installation and Wiring Binary Outputs Outputs are load side switching triacs. The triac acts as a switch, either making or breaking the circuit between the load (valve, damper, contactor, relay) and ground.
Installation and Wiring 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.
Installation and Wiring Mounting The Tracer ZN.520 circuit board is mounted in the left-hand end pocket for all classroom unit ventilator configurations. The sheet metal mounting plate has raised embosses 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 allows the Tracer ZN.520 controller to be secured with a minimal number of sheet metal screws.
Installation and Wiring The mounting position on the vertical classroom unit ventilator configuration allows complete access to the Tracer ZN.520 by removing 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 components behind the control board.
Installation and Wiring Wiring WARNING ! Warning! Disconnect all electrical 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 Caution: To prevent damage to the unit ventilator, refer to the diagram provided on the inside of the unit's access panel for specific wiring infor- mation. All controls are wired at the factory.
Installation and Wiring Installing the WallMounted Zone Sensor (Optional) Zone sensor location is an important element of effective room control and comfort. The best sensor location is typically on a wall, remote from the HVAC unit. Readings at this location assure that the desired setpoint is achieved across the space, not just near the unit itself. Note: It may be necessary to subdivide the zone with multiple units to ensure adequate control and comfort throughout the space.
Installation and Wiring Humidity and CO2 Sensors Humidity and CO 2 sensors should be mounted in a similar location as the zone sensor.
Typical Wiring Diagram—Wall Mounted Zone Sensor UV-SVP01A-EN 27
Typical Wiring Diagram—Unit Mounted Zone Sensor 28 UV-SVP01A-EN
Typical Wiring Diagram—Unit Mounted Switch, Wall Mounted Sensor UV-SVP01A-EN 29
Input/Output Summary Input/Output Summary The following lists all possible binary and analog inputs and outputs available for the classroom unit ventilator applications. Some of the points listed may be mutually exclusive and some are optional. (See Table 8: Input and output summary) Most binary inputs and outputs are wired from the factory based on unit configuration and options. If the generic inputs and outputs are to be used, wiring connections are made at the 1/4” quick-connect terminals provided.
Input/Output Summary Table 8: Input and output summary Input Description Zone Temperature Setpoint Fan Speed Entering Water Temperature Analog Inputs Discharge Air Temperature Outdoor Air Temperature/ Generic Generic/Humidity/CO2 (420mA) UV-SVP01A-EN 31
Configuration 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 factory per the selected unit configuration.
Configuration Binary Outputs1 Table 10: Binary output summary Binary output Classroom unit ventilator Valid range J1-1 Fan high NA J1-2 Exhaust fan or none NA J1-3 Fan low NA J1-4 (Key) NA Cooling valve open NA J1-5 Face bypass cool isolation valve Normally open or normally closed 2 2-position cooling Normally open or normally closed 2 DX NA J1-6 Cooling valve close NA J1-7 Face bypass damper open NA J1-8 Face bypass damper close NA Heating valve open J1-9 NA Face bypass
Configuration Binary Inputs 1 Table 11: Binary input summary Binary input Configuration Valid range BI 1 Low coil temperature detection or not used Normally open Normally closed BI 2 Not used Normally open Normally closed BI 3 Occupancy, generic, or not used Normally open Normally closed BI 4 Fan status or not used Normally open Normally closed 1. Trane Rover service tool uses the unit type to determine and download the proper default binary input configuration.
Configuration Fan Configuration Table 13: Fan configuration ranges Fan configuration Default Valid range Fan operation in heating Continuous Continuous (during occupied) Cycling with capacity (unoccupied) Fan operation in cooling Continuous Continuous (during occupied) Cycling with capacity (unoccupied) Number of fan speeds Varies 2 1, 2 Configurable fan speed heating Varies 2 Off, low, high, auto Configurable fan speed cooling Varies 2 Off, low, high, auto Zone sensor fan switch Enable
Configuration Setpoints Table 15: Setpoint defaults Setpoint Default Valid range 71°F 40 to 115°F Occupied cooling setpoint 74°F 40 to 115°F Occupied standby heating setpoint 67 °F 40 to 115°F Occupied standby cooling setpoint 78 °F 40 to 115°F Unoccupied heating setpoint 60°F 40 to 115°F Unoccupied cooling setpoint 85°F 40 to 115°F Heating setpoint low limit 1 40°F 40 to 115°F 40°F 40 to 115°F 105 °F 40 to 115°F Occupied heating setpoint Cooling setpoint low limit 1 Heating s
Configuration Occupied Bypass Timer Table 18: Bypass timer range Occupancy bypass timer1 Default Valid range 120 Minutes 0 to 240 minutes (1 minute resolution) Default Valid range 120 seconds Disable or enable Default Valid range 0 0 to 10,000 hours 1. The occupied bypass timer is used for timed override applications.
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 identification tag remains permanently affixed to the unit for identification purposes. The bottom portion of the tag provides pertinent information that is removable to be placed on building plans or in “Appendix—Location Identifier” on page68.
Unit Operation Power-Up When 24 VAC is initially applied to the controller, the following sequence of events occurs: q Green status LED turns ON . q All outputs are controlled OFF . q The controller reads input values to determine initial values. q 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.
Unit Operation 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 interpreted as Auto.
Unit Operation 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 allow hydronic cooling. If the desired water temperature is available, the unit begins normal heating and cooling operation. If the measured entering water temperature is not adequate for the desired heating or cooling, the controller begins the entering water temperature sampling logic. The Tracer™ ZN.
Unit Operation seconds. This provides the ample torque required to start all fan motors 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 control, the controller must be configured for a 1- or 2-speed fan. The exhaust fan/damper is coordinated with the unit fan and outdoor damper operation.
Unit Operation controller for standalone applications. When a unit uses 2-way modulating valves, it is possible for the water near the entering water temperature sensor to migrate towards ambient temperature. The Tracer ZN.520 controller has a water sampling feature for these applications. 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 controller drives the valve fully open.
Unit Operation Automatic Outdoor Air Damper Adjustment The Tracer ZN.520 controller is capable of using different minimum outdoor air damper positions for high and low fan speeds, which are configurable. This allows the ventilation 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.
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 enable point. If the exhaust fan enable setpoint is less than 10%, the Tracer ZN.520 controller energizes the exhaust fan at the enable point and disables it when the outdoor air damper closes.
Unit Operation due to a safety or command. The controller enters the FRE EZE AVOIDANCE mode when an outdoor air temperature is present (communicated or hardwired) and it is below the freeze avoidance setpoint (configurable). The controller disables freeze avoidance when the outdoor air temperature rises 3°F above the freeze avoidance setpoint.
Unit Operation Figure 24: More complex data sharing application UV-SVP01A-EN 47
Unit Operation Power-Up When 24 VAC is initially applied to the controller, the following sequence of events occurs: q Green status LED turns ON . q All outputs are controlled OFF . q The controller reads input values to determine initial values. q 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.
Unit Operation 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 interpreted as Auto.
Unit Operation 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 allow hydronic cooling. If the desired water temperature is available, the unit begins normal heating and cooling operation. If the measured entering water temperature is not adequate for the desired heating or cooling, the controller begins the entering water temperature sampling logic. The Tracer™ ZN.
Unit Operation seconds. This provides the ample torque required to start all fan motors 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 control, the controller must be configured for a 1- or 2-speed fan. The exhaust fan/damper is coordinated with the unit fan and outdoor damper operation.
Unit Operation controller for standalone applications. When a unit uses 2-way modulating valves, it is possible for the water near the entering water temperature sensor to migrate towards ambient temperature. The Tracer ZN.520 controller has a water sampling feature for these applications. 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 controller drives the valve fully open.
Unit Operation Automatic Outdoor Air Damper Adjustment The Tracer ZN.520 controller is capable of using different minimum outdoor air damper positions for high and low fan speeds, which are configurable. This allows the ventilation 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.
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 enable point. If the exhaust fan enable setpoint is less than 10%, the Tracer ZN.520 controller energizes the exhaust fan at the enable point and disables it when the outdoor air damper closes.
Unit Operation due to a safety or command. The controller enters the FRE EZE AVOIDANCE mode when an outdoor air temperature is present (communicated or hardwired) and it is below the freeze avoidance setpoint (configurable). The controller disables freeze avoidance when the outdoor air temperature rises 3°F above the freeze avoidance setpoint.
Unit Operation Figure 24: More complex data sharing application UV-SVP01A-EN 47
Troubleshooting 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. The Service push button, located at the bottom center of the controller, can be used to install the Tracer™ ZN.520 Unit Controller in a communication network. Refer to the Rover and Tracer Summit product literature for more information.
Troubleshooting 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. Press and hold the Test button for at least two seconds, then release the button to start the test mode. 2.
Troubleshooting .
Troubleshooting Safeties Discharge Air Temperature Limit Freeze Protection When the discharge air exceeds the high or low limit setpoint and the unit can not correct it by altering capacity, a “Discharge Air Temp Limit” diagnostic is generated. The Tracer ZN.520 controller has two methods of freeze protection. 1. 2. 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.
Troubleshooting Diagnostics Table 28: Tracer™ ZN.520 Unit Controller diagnostics Latching/nonlatching Reset 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 communicated or manual reset will be necessary.
Troubleshooting Table 28: Tracer™ ZN.
Troubleshooting Table 28: Tracer™ ZN.
Troubleshooting power, the unit cycles through a power-up sequence and clears all timers. By default, the controller attempts to reset all diagnostics at powerup. Diagnostics present at powerup and those that occur after power-up are handled according to the defined unit diagnostics sequences (For more information see,Table 28: Tracer™ ZN.520 Unit Controller diagnostics, on page 52 for more information.) . Building automation system Some building automation sys- tems (i.e.
Troubleshooting 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 controller remains off until the random-start time expires.
Troubleshooting Table 31: Valves stay open 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.
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).
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 circuit 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 the circuit board ONLY. 5. Connect Rover and properly configure the controller, unless a previously configured board is purchased. 6. Power down. 7.
Appendix Hardwired Setpoint Adjustment 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 Fan Switch Resistance Values Table 36: Resistance values Resistance (Ω ) Switch Position 16,300 High 10,700 Low 2,320 Auto 4,870 Off Hardwired Thermistor Values Table 37: Hardwired 10k Ω thermistor values Resistance Temperature Resistance Temperature 87.5k Ω 0°F 10.0k Ω 77°F 74.
Appendix—Binary Configuration Binary Configuration Table 38: Binary configuration details Binary input or output Function Configuration Description BI 1 Low temp detection Normally closed Closed: BIP 1 is Normal (no diagnostic) Open: BIP 1 is Active (diagnostic) BI 2 Condensate overflow Normally closed Closed: BIP 2 is Normal (no diagnostic) Open: BIP 2 is Active (diagnostic) BI 3 Occupancy Normally closed Closed: BIP 3 is Normal (Occupied) Open: BIP 3 is Active (Unoccupied)1 Normally open
Appendix—Unit Operation Unit Operation Based On The Effective HEAT / COOL 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 Determined by controller Fan—Enabled Heating—Enabled Cooling—Enabled Damper—Enabled Heating Fan—Enabled Heating—Enabled Cooling—Disabled Damper—Enabled Morning warm up Fan—Enabled Heating—Enabled Cooling—Disabled Damp
Appendix—Unit Operation cont.
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.
Appendix—Timeclock Setting the Time Clock The time clock must be programmed 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.
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 unoccupied, the time clock should be programmed accordingly to conserve energy.
Appendix—Timeclock To switch the load permanently OFF, press the key a third time. [O] appears in the display. To return to automatic (programmed) 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 cabinet panel. It is only used to remove power to the unit for servicing.
Appendix—Location Identifier This area provided for the removable tag.
Location Identifier UV-SVP01A-EN 69
Location Identifier 70 UV-SVP01A-EN
Location Identifier UV-SVP01A-EN 71
The Trane Company Worldwide Applied Systems Group LaCrosse, Wisonsin www.trane.com An American Standard Company Literature Order Number UV-SVP01A-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.
