Trane Tracer VV550 Installation, Operation And Maintenance Manual
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Trane Tracer VV550 Installation, Operation And Maintenance Manual

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Installation, Operation, and Maintenance
®
Tracer
VAV Controller
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are
attached to the equipment.
April 2021
VV550/551
SAFETY WARNING
CNT-SVX17G-EN

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Summary of Contents for Trane Tracer VV550

  • Page 1 Installation, Operation, and Maintenance ® Tracer VV550/551 VAV Controller SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
  • Page 2 Copyright This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in part without written permission. Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.

  • Page 3: Table Of Contents

    Table of Contents Overview ............6 Supported and Non-supported Equipment .
  • Page 4 Table of Contents Normal Operation ..........33 Occupancy .
  • Page 5 Table of Contents Stand-alone Control ..........72 Air Balance Functions .

  • Page 6: Overview

    Overview The Tracer VV550 and Tracer VV551 are variable air volume (VAV) controllers. The Tracer VV550 is the factory-installed version of the controller and the Tracer VV551 is the field- installed version of the controller. Both versions have the same capabilities.

  • Page 7: Non-Supported Equipment

    VariTrac® bypass air valve Features and Specifications Features Table 1 compares the features of the Tracer VV550/551 controller with the features of the VAV 4.2 controller. Table 1. Comparison of the Tracer VV550/551 controller and the VAV 4.2 controller Tracer VV550/VV551 VAV 4.2...

  • Page 8: Specifications

    18 to 32 Vac (24 Vac nominal) Control board, 4 VA Four outputs, 48 VA maximum 50 or 60 Hz Note:Trane recommends a separate transformer, fuse, and switch for each controller. Board dimensions • Height: 5.5 inches (13.97 cm) • Width: 2 inches (5.08 cm) •...

  • Page 9: Inputs And Outputs

    Inputs and Outputs The inputs and outputs associated with the Tracer VV550/551 controller are shown in ® Table 3 and discussed in this section. Table 3. Input and output summary Input or output Description Comm5 • Communication link; • Rover™ service tool. Binary input One input configured as one of the following: •...

  • Page 10: Comm5 Communications Link

    Inputs and Outputs Comm5 Communications Link The controller provides a total of six terminals for connection to the Comm5 communication link. It is not necessary to observe polarity for Comm5 communication links. The terminal descriptions follow: • Two terminals for communication to the board (In Comm); •...

  • Page 11: Binary Input

    BI 1 Input Generic On the Tracer VV550 factory-installed controller, the binary input configuration is set up at the factory. The controller is correctly set up for each factory-supplied binary input end device. On the Tracer VV551 field-installed controller the binary input has to be configured with the Rover service tool for the connected end device.

  • Page 12: Occupancy And Generic Binary Input Configuration

    Inputs and Outputs Occupancy and Generic Binary Input Configuration Table 6 shows the occupancy and generic binary input configuration. Table 6. Occupancy and generic binary input configuration Binary input Binary input Contact Occupancy Generic type state mode configuratio configuratio Occupancy Open Occupied Not valid...

  • Page 13: Space Temperature Analog Input

    The space (zone) temperature analog input can only be used for space temperature. ® Space temperature is measured with a 10k thermistor in the Trane zone sensor. The controller receives the space temperature either from a local analog input, as measured by the zone sensor, or as a remote communicated value.

  • Page 14: Space Setpoint Analog Input

    The local setpoint input (SET) is designed as the local (hardwired) setpoint input. You cannot use the input for other functions. The local setpoint is a resistive input intended for use with Trane zone sensors. The controller generates a setpoint failure diagnostic when a valid setpoint is established (through the hardwired input or through communications) and neither the local setpoint nor the communicated setpoint is present.

  • Page 15: Primary Air Temperature/Discharge Air Temperature Analog Input

    Inputs and Outputs Primary Air Temperature/Discharge Air temperature Analog Input The controller senses the primary or discharge air temperature input with a hardwired 10k thermistor. The primary/discharge air temperature analog input can be configured as either primary air temperature or discharge air temperature and applied as: •...

  • Page 16: Primary Airflow (Differential Pressure) Analog Input

    Inputs and Outputs 5. Manual output test 6. Autocommission 7. Water valve override Primary Airflow (Differential Pressure) Analog Input The controller can operate with or without a valid flow value (either hardwired or communicated). It operates under pressure-dependent control or pressure-independent control.
  • Page 17 Inputs and Outputs Table 10.Flow sensor loss impact depends on control algorithm configuration Airflow sensor Type of Unit operation Air valve operation Reheat failure control • Open or shorted Space Pressure dependent Normal Normal Normal after being valid; temperature mode; airflow sensor control failure diagnostic •...

  • Page 18: Zone Sensor Inputs

    Inputs and Outputs Zone Sensor Inputs The Tracer® VV550/551 controller receives inputs from the zone sensor. Typical zone sensor wiring connections are shown in Table ® Table 11.Typical Trane zone sensor description and wiring Description Space temperature (ZONE) Common Setpoint (SET)

  • Page 19: 10K Thermistor

    10k Thermistor ® Trane wall-mounted zone sensors use a 10k thermistor to measure the space temperature. The sensors communicate over a hardwired connection. However, if both a hardwired and communicated space temperature value are available, the controller ignores the hardwired space temperature input and uses the communicated value.
  • Page 20 Inputs and Outputs When the hardwired setpoint adjustment is used to determine the setpoints, all unit setpoints are calculated based on the hardwired setpoint value, the configured setpoints, and the active mode of the controller. For example, Table 12 shows the derivation of effective setpoints from default values and a setpoint input.

  • Page 21: Single-Star (*) And Double-Star (**) Thumbwheel Settings

    Inputs and Outputs These setpoint limits apply only to the occupied and occupied standby, heating, and cooling setpoints. They do not apply to the unoccupied heating and cooling setpoints. When the controller is in the unoccupied mode, it always uses the unoccupied heating and cooling setpoints.

  • Page 22: Binary Outputs

    Inputs and Outputs Binary Outputs Each Tracer® VV550/VV551 controller provides five binary outputs (see Table 13). The binary outputs are load side-switching triacs. Each triac acts as a switch that either makes or breaks the circuit between the load and ground. Table 13.Binary output descriptions and wiring Binary output Terminals...

  • Page 23: Analog Output

    Inputs and Outputs The controller also includes overrides for the fan, auxiliary heat (reheat), water valve, airflow, and emergency override. For more information on overrides, see “Sequence of Operations,” p. Analog Output The Tracer® VV550/VV551 controllers do not provide an analog output capability. CNT-SVX17G-EN...

  • Page 24: Control Modes

    Air balance functions. Control Modes The Tracer VV550/VV551 controllers are factory configured for a variety of VAV unit types. The controller supports three control modes: two temperature controls and one pressure control. Table 1 shows the basic unit type and control mode combinations, Table 2 describes the occupancy modes for each control mode, and Table 3 shows the possible heat options.
  • Page 25 Sequence of Operations Table 15.Algorithm type and control sequence descriptions (continued) Occupancy Control mode mode Description Ventilation flow Occupied Controller controls to the active airflow setpoint and modulates the heating control capacity to keep the discharge air temperature at the active discharge air temperature setpoint.

  • Page 26: Control Sequences

    The power-up/reset sequence is the highest priority sequence. After the configuration is defined, the manual output test can be initiated. When 24Vac power is initially applied to the Tracer VV550/551 controller or a reset occurs, the following sequence occurs: 1. Green status LED turns ON.

  • Page 27: Manufacturing Test

    Sequence of Operations ix.Communicated source temperature; x.Communicated field override; xi.Communicated valve override. 7. Normal operation begins (assume modulating valves/valve are closed at power up). 8. Calibration occurs if auto calibration is enabled. 9. Normal operation resumes. Manufacturing Test Manufacturing test is the sequence the controller uses when factory testing is being conducted.

  • Page 28: Manual Output Test

    Sequence of Operations Table 18.Flow tracking emergency override operation Communicated emergency override Reheat No heartbeat output Air valve Normal or not valid Don’t care Don’t care Normal Pressurize Don’t care Don’t care Closed Depressurize Don’t care Don’t care Open Purge Don’t care Don’t care Open...

  • Page 29: Auto-Commissioning Test Sequence

    Sequence of Operations Table 19.Manual output test sequence (continued) Heat 1 or Heat 2 or water water Heat 3 or valve Air valve valve valve fan On/ Step close open close open Off/On 5. Heat 1 turns Off; Heat 2 turns On/water valve opens Off/On On/On...
  • Page 30 Sequence of Operations The auto-commissioning test does not require a flow sensor or an auxiliary temperature sensor. If there is no flow sensor, the controller runs in pressure-dependent mode. An auxiliary temperature sensor in the discharge air stream is required for testing of the fan and the reheat.

  • Page 31: Calibration Sequence

    Sequence of Operations Table 20.Auto-commissioning test sequence (continued) Item Test action Reported data Local reheat Starting auxiliary 1. If no fan is present, open the air valve to the configured minimum local heating electric temperature and airflow. the auxiliary 2. If the fan is present, close the air valve and turn On the fan. temperature for 3.

  • Page 32: Overrides: Water Valve, Flow, Fan

    Sequence of Operations Overrides: Water Valve, Flow, Fan These three overrides have the same priority in the control sequences: Water Valve Override When the controller responds by driving the outputs within five seconds of receiving the communicated valve override network variable. The actuators are driven as quickly as possible to the correct position.

  • Page 33: Normal Operation

    Sequence of Operations Table 23.Airflow override controller operation (continued) Communicated flow override Local or Air valve remote reheat 4 = Open Normal Open Series normal Fully open all air valves Parallel Off 5 = Close Normal Close Normal Fully close all air valves 6 = Minimum Normal Control airflow to the configured minimum...

  • Page 34: Occupancy

    • Occupancy arbitration. Occupancy Modes Tracer VV550/551 controllers have four valid occupancy modes. Occupied Mode Occupied mode is the normal (default) operating mode for occupied spaces or daytime operation. When the controller is in the occupied mode, it uses occupied setpoints and runs in: •...
  • Page 35 Sequence of Operations (hardwired) occupancy binary input. Once in occupied standby mode, the controller uses the occupied standby cooling and heating setpoints, which typically cover a wider range than the occupied setpoints. The wider range reduces the demand for heating and cooling in the space.

  • Page 36: Space Setpoint Operation

    Sequence of Operations Space Setpoint Operation Space setpoints provide temperature boundaries for each of the occupancy modes of the Tracer ® VV550/VV551 controllers. There are three sets of possible heating and cooling setpoints available: • Occupied (also used by occupied bypass); •...

  • Page 37: Determining The Occupancy Mode

    The occupancy mode of the controller is determined by evaluating a combination of three communicating inputs, the hardwired occupancy input, and the timed override ON and CANCEL buttons on the Trane zone sensor. Three communicating inputs affect the controller occupancy mode: •...

  • Page 38: Overriding Occupancy

    In such devices, the communicated occupancy sensor variable is used to communicate the occupancy mode to the controller. Trane systems and zone sensors do not currently send this variable. The hardwired occupancy input of the controller is handled as if it is a communicated occupancy sensor input.

  • Page 39: Occupancy Arbitration

    Occupancy Arbitration ® Table 28 shows occupancy arbitration for Trane Comm5 devices. Table 28.Effective occupancy arbitration for Trane Comm5 devices Communicated Communicated Reported Communicated occupancy occupancy effective occupancy...

  • Page 40: Space Temperature Control Mode

    Sequence of Operations Table 28.Effective occupancy arbitration for Trane Comm5 devices (continued) Communicated Communicated Reported Communicated occupancy occupancy effective occupancy mode schedule mode sensor Occupancy occupancy mode override (heartbeat) (heartbeat) binary input Bypass timer mode Not present Occupied Occupied Occupied...

  • Page 41: Heating Or Cooling Control Mode Operation

    Sequence of Operations The controller heat/cool mode is determined by either a communicated request or by the controller itself, when the heat/cool mode is auto. When the heat/cool mode is auto, the controller compares the primary air temperature with the configured auto-changeover setpoint to determine if the primary air is hot or cold.

  • Page 42: Heating And Cooling Changeover Logic

    Sequence of Operations Heating and Cooling Changeover Logic The controller can receive communicated requests for heating or cooling operation. Two communicated variables (communicated application mode and communicated heat/ cool mode) are used to communicate the requests to the controller (see Table 29).

  • Page 43: Cooling Operation

    Sequence of Operations Table 29.Heating and cooling changeover logic (continued) Reported System heat/ command, cool communicated Primary air mode or application temp, reported mode, communicated Local unit Active communicated source temp or zone status valve Air valve a, b heat/cool mode local input demand mode...

  • Page 44: Heating Operation

    Sequence of Operations Heating Operation Under space temperature control, during the heating mode (communicated heat/cool mode is heat), the controller attempts to maintain the space temperature at the active heating setpoint. Based on the controller occupancy mode, the active space heating setpoint is either the occupied heating setpoint, the occupied standby heating setpoint, or the unoccupied heat setpoint.

  • Page 45: Air Valve Control In Space Temperature Control Operation

    Sequence of Operations Table 30.Controller operation during occupied heating and cooling (continued) Primary airflow control active minimum Space Temperature airflow setpoints Fan control Reheat control < Active Heat Stpt Modulate from heat max to highest min: Series On Reheat Off Parallel Off •...
  • Page 46 Sequence of Operations Hydronic heat is enabled if there is no valid primary air temperature. Hydronic heat is disabled if the primary air temperature is greater than the configured reheat enable setpoint. Figure 1 shows the primary air temperature status determination. Figure 1.
  • Page 47 Sequence of Operations Modulating (three-wire) hydronic heat The amount of modulating hot water reheat required is determined by a control algorithm. The algorithm determines the percentage of available reheat capacity needed to satisfy zone heating requests. The modulating valve then is driven to the calculated position.
  • Page 48 Sequence of Operations The factory-installed local electric heater provides two mechanical safeties. The two safeties are independent of the controller. The controller provides no indication of the state of the safeties. One safety is an automatic thermal cutout that trips when the temperature is 140°F (60°C).

  • Page 49: Morning Warm-Up

    Sequence of Operations reheat are limited by the communicated auxiliary heat enable. The methods of control for the reheat actuation schedule with a parallel fan present are described in the following tables: • Table 69 on page 105. Local heat only with parallel fan present •...

  • Page 50: Pre-Cool (Morning Cool Down)

    Sequence of Operations Table 32.Controller operation during morning warm-up (continued) Primary airflow Primary air temperature Space temperature control Fan control Reheat control Warm air in duct: < Active heating Normal control, Series On Reheat Not setpoint modulate from Parallel Off Present Configured auto-changeover heat min to max...

  • Page 51: Maximum Flow Heat

    Sequence of Operations Maximum Flow Heat The controller enters maximum flow heat on receipt of a communicated command and remains in maximum flow heat until the command changes. The controller maintains the flow rate at the heating maximum flow setpoint. Table 34 shows controller operation during maximum flow heat.

  • Page 52: Ventilation Control

    Sequence of Operations Ventilation Control Ventilation is in effect whenever the space temperature controller is in one of the following modes: • Occupied heating; • Occupied cooling; • Occupied standby heating; • Occupied standby cooling. Ventilation is allowed as long as the space temperature remains in control. If the space temperature gets too cold or too hot, limiting ventilation can help get the space temperature back under control.
  • Page 53 Sequence of Operations Table 35.Data required for each method of ventilation control (continued) Method -based Prescribed ASHRAE Variable Description setpoint rate Reported space CO Space CO concentration: Not used for control, but passed to Mandatory Do not care the system for monitoring. Reported ventilation Ventilation ratio Required ratio of OA to...
  • Page 54 Sequence of Operations CO2-based demand-control ventilation procedure -based demand-control ventilation uses the communicated space CO value. The controller cannot monitor CO from a local CO sensor. The controller compares the space CO concentration to the configured band of CO values and determines the demand ventilation rate of the zone.
  • Page 55 Sequence of Operations ASHRAE rate procedure If no communicated CO value is present, the prescribed ASHRAE rate procedure is used. For zones performing ventilation control without CO sensors, the ventilation requirement is based on either the occupancy mode of the zone, as prescribed in ASHRAE 62-2001, or on the communicated ventilation setpoint.
  • Page 56 Sequence of Operations Arbitration of ventilation requirements Figure 2 shows the arbitration of reported effective ventilation setpoints. Figure 2. Arbitration of reported effective ventilation setpoint Effective ventilation setpoint = configured ventilation setpoint (see Note 1) No (most likely occupied) Effective ventilation setpoint = 0 Effective ventilation setpoint = Occupied configured standby ventilation setpoint...
  • Page 57 Sequence of Operations Ventilation Control actions The controller uses the reported effective ventilation setpoint to find the reported ventilation ratio. Reported ventilation ratio = reported effective ventilation setpoint ÷ reported airflow ™ Tracer Summit ventilation control The values of reported effective ventilation setpoint, reported ventilation ratio, and reported airflow are sent to the Tracer Summit BAS for use in system ventilation control functions.
  • Page 58 Sequence of Operations The minimum can be adjusted down at anytime, but only as far as the configured minimum airflow. Figure 3 provides a flow diagram of local ventilation actions. Figure 3. UCM local ventilation operations Invalid ventilation ratio Ventilation = uncontrollable (see Note 1) UCM sends: Is unit in pressure dependent –...
  • Page 59 Sequence of Operations Active Minimum Flow Setpoint Selection Arbitration The controller selects the active minimum flow setpoint based on the occupancy mode, the use of reheat, and the control mode. Table 38 shows the minimum airflow setpoints. Ventilation reset may raise the active minimum flow setpoint when ventilation reset is being performed at the system level.
  • Page 60 Sequence of Operations A ventilation flow controller in the occupied mode uses the communicated ventilation setpoint or the configured ventilation setpoint for the airflow setpoint. A ventilation flow controller in the unoccupied mode uses zero for the airflow setpoint. The ventilation flow control uses nviVentSetpt if it is valid. If nviVentSetpt is not valid, the ventilation flow control uses one of the following two airflow setpoints: •...
  • Page 61 Sequence of Operations Table 40.Space temperature controller active minimum airflow setpoint selection (continued) Effective Control Local occupancy action  reheat Active minimum setpoint (the greatest of the STC mode mode (PAT) state following) Unoccupied Unoccupied Cooling • Zero (air valve closed) cool •...
  • Page 62 Sequence of Operations Table 40.Space temperature controller active minimum airflow setpoint selection (continued) Effective Control Local occupancy action  reheat Active minimum setpoint (the greatest of the STC mode mode (PAT) state following) Unoccupied Unoccupied Cooling • Zero (air valve closed) cool •...

  • Page 63: Unoccupied Space Temperature Control

    Sequence of Operations Unoccupied Space Temperature Control When no space temperature is present, the controller does not run heating or cooling capacity in unoccupied. Ventilation requirements are assumed to be zero. The controller enters this mode from a communicated command or from a local occupancy sensor. Table 41 shows unoccupied space temperature control.

  • Page 64: Fan Control

    Sequence of Operations Note: The nvoUnitStatus.mode and nvoHeatCool both report Cool when nvoSpaceTemp is 0.01°C above the configured unoccupied cooling setpoint. The nvoUnit Status.mode and nvoHeatCool both report Heat when nvoSpaceTemp is 0.01°C less than the configured unoccupied heating setpoint. Otherwise, there is no change in nvoUnitStatus.mode and nvoHeatCool.
  • Page 65 Sequence of Operations Parallel Fan The parallel fan is the first stage of heat. When the primary air temperature is cold, the parallel fan: • Cycles ON as the first stage of heat during occupied mode or occupied standby mode; •...

  • Page 66: Ventilation Flow Control Mode

    Sequence of Operations Ventilation Flow Control Mode Ventilation flow control (VFC) is one of three supported control algorithms. It is applied to a VAV terminal and used to temper cold outdoor air (OA) that is brought into a building for ventilation purposes. The tempered air is intended to supply an air-handling unit (AHU), which provides comfort control to the zones it is serving.

  • Page 67: Air Valve Control

    Sequence of Operations The ventilation flow control uses nviVentSetpt if it is valid. If nviVentSetpt is not valid, the ventilation flow control uses one of the following two airflow setpoints: • If no reheat being used, it uses the configured Ventilation Setup Occupied Setpoint; •...

  • Page 68: Modulating Reheat Control (Hot Water Only)

    Sequence of Operations For staged electric ventilation flow control, the number of installed stages can range from one to three. Three stages are recommended, since finer control is available with more stages. In cases where the outdoor air temperature is more than 48°F (26.67°C) below the discharge air temperature setpoint, the controller cannot provide the requested control performance.

  • Page 69: Morning Warm-Up

    Sequence of Operations value of the configured outdoor air low limit, the hot water valve is fully opened. The hot water valve remains open until the communicated source temperature is 10°F (5.56°C) above the configured outdoor air low limit or occupied operation begins. Stand-alone Controller Freeze Protection Controllers operating without communications do not have the source temperature available to them.

  • Page 70: Unoccupied Ventilation Flow Control

    Sequence of Operations Unoccupied Ventilation Flow Control The controller closes the air valve. Local electric heat and hot water heat are disabled. The hot water valves open if needed for freeze protection. The operation of freeze protection for local hot water heat depends on whether the controller is operating as a network controller or a stand-alone controller.

  • Page 71: Air Valve Control In Flow Tracking Control Operation

    Sequence of Operations Table 44.Flow tracking control required inputs Communicated Calibration Airflow sensor Configured airflow Air valve position airflow setpoint tracking offset Invalid Do not care Do not care < 0 Closed > 0 Configured maximum airflow Do not care Failed Do not care <...

  • Page 72: Morning Warm-Up

    Sequence of Operations Morning Warm-up Morning warm-up in ventilation flow control acts like auto. Pre-cool (Morning Cool Down) Pre-cool in ventilation flow control acts like auto. Maximum Flow Heat Maximum flow heat in ventilation flow control acts like auto. Night Purge Night purge in ventilation flow control acts like auto.

  • Page 73: Air Balance Functions

    Sequence of Operations Air Balance Functions There are two functions which enable air balancing: zone sensor air balance function and communicating air balance function. Zone Sensor Air Balance Function A single point air balance function can be initiated at the zone sensor. Place the thumbwheel at either the maximum (double star [**]) or the minimum (single star [*]) flow override position and press the CANCEL button for 10 seconds.

  • Page 74: Communicating Air Balance Function

    Sequence of Operations Communicating Air Balance Function The controller supports a comprehensive two-point air balance function only over communications. An optional feature in the Rover service tool is used to do two-point air balancing, which gives greater accuracy in box calibration for the controller. This function uses the configured airflow measurement gain and the configured airflow measurement offset to correct for slope and offset errors.

  • Page 75: Analog Input Calibration

    Analog Input Calibration ™ With the Rover service tool, you can calibrate three controller analog inputs: • Space temperature • Space setpoint • Flow sensor For each input, the calibration value is added to the measured value to determine the effective value.

  • Page 76: Configuration

    Configuration considerations; • Parameter configurations; • Operation without configuration. Configuration Considerations Table 45 lists details that must be considered when configuring a Tracer VV550/VV551 system. Table 45.Configuration considerations Category Detail to consider Unit types • Single duct • Series fan powered •...

  • Page 77: Location Identifier

    Changes to LonMark configuration properties are handled on the fly and do not require the controller to be reset. The controller is responsible for range checking the incoming values and taking the appropriate action if the valid ranges are violated. The Rover service tool is required to setup Trane configuration properties. CNT-SVX17G-EN...

  • Page 78: Application Information

    Application Information ™ Use the Rover service tool to set up peer-to-peer applications. Refer to the Operation and Programming, Rover Version 5.0 user guide for more information on setting up applications. CNT-SVX17G-EN...

  • Page 79: Troubleshooting

    Troubleshooting Topics in this chapter consist of: • LED operation; • Manual output test; • Diagnostics; • Resetting diagnostics; • Questionable unit operation. LED Operation Red Service LED Table 47 shows and describes red service LED activity. Table 47. Red service LED activity Red service LED activity Description LED is Off continuously after power is applied...

  • Page 80: Green Status Led

    Troubleshooting Green Status LED The green status LED is typically used to indicate whether or not the controller is powered On (24 Vac). This is the only LED under direct software control. The green status LED is Off when you press the Test button.

  • Page 81: Diagnostics

    Troubleshooting Diagnostics ® Table 50 shows the Tracer VV550/551 controller diagnostics. Table 50. Controller diagnostics Diagnostic Air valve Reheat Invalid unit configuration 0 VDC 0 VDC 0 VDC Controller failure Closed Discharge air temperature failure (space Normal Normal Normal temperature control) Discharge air temperature failure Normal Do not care...
  • Page 82 The diagnostics are reported in the order they occur. The reported alarm message is made up of two parts. The first part is the Trane alarm level. The second part is the alarm message text. The level and the text are separated by one space. The total length must be equal to or less than 30 characters.

  • Page 83: Resetting Diagnostics

    Troubleshooting Table 53. Automatically resetting diagnostics Level Reported alarm message text Description Low primary airflow preventing electric Low airflow reheat from turning On The thumbwheel setpoint and the thumbwheel star and double star function are enabled in configuration. Thumbwheel in */** position The thumbwheel setpoint is cranked all the way to the single star or the double star position.

  • Page 84: Manual Output Test

    Troubleshooting Manual Output Test You can use the Test button on the controller during installation or troubleshooting to verify proper end device operation. When you press the Test button, the controller exercises all outputs in a predefined sequence. The last step of the sequence resets the controller. See topic “Manual Output Test,”...
  • Page 85 Troubleshooting Table 56. Reheat outputs do not energize (continued) Probable cause Explanation The controller includes a manual output test function you can use to verify output operation and associated output wiring. However, based on the current step in the test sequence, the unit reheat may not be on. For Manual output test more information on manual output test, refer to sections “Manual Output Test,”...
  • Page 86 Troubleshooting Table 58. Air valve and/or water valve stay open (continued) Probable cause Explanation A specific list of controller diagnostics affects valve operation. For more information on controller Diagnostic present diagnostics, refer to Table 50, p. 81. Freeze protection for a ventilation flow control unit opens the water valve or valves.

  • Page 87: Appendix A: Properties, Data Lists Points, And Network Variables

    Appendix A: Properties, Data Lists Points, and Network Variables ® The Tracer VV550/551 controller uses the Space Comfort Controller (SCC) profile. Twenty-two properties were added to the space comfort controller object for the Tracer VV550/551 controller: • Air Flow Override: Tracer • Air Flow Stpnt: Active Min •...
  • Page 88 Proprietary Proprietary Tracer setpoint Primary secondary Proprietary Proprietary Proprietary No property Auto commission Auto-commissioning Cmd: Proprietary Proprietary Proprietary Trane command Tracer Discharge air Proprietary nviDischAirStpt SNVT_temp_p Note No property temperature setpoint Ventilation Ratio Limit: Ventilation ratio limit Proprietary nviVentRatioLim SNVT_lev_percent...
  • Page 89 Appendix A: Properties, Data Lists Points, and Network Variables ® Table 60. SCC profile for the Tracer VV550/551 controller (continued) Tracer ® Standard network VV550/ Tracer Summit SCC profile Network variable variable type (SNVT) property Space temperature Mandatory nvoSpaceTemp SNVT_temp_p Note Space Temperature: Active Unit status, mode...
  • Page 90 Proprietary No property capacity Dehumidification Proprietary Proprietary Proprietary No property status Generic binary input Proprietary Proprietary Proprietary Trane Generic Binary Input (1-1) status Generic binary output Generic Binary Output (1- Proprietary Proprietary Proprietary status Heat stages Proprietary Proprietary Proprietary Heat Stage Status (1-8)
  • Page 91 Two separate properties: one for cooling, one for heating. e. Implemented in a proprietary manner but is available to others through public nvi/nvo. ® f. Trane is proprietary. Trane only. g. Unit Status is mandatory, but not all elements of the structure are required.

  • Page 92: Appendix B: Tracer Summit™ Bas Present Value Chart

    Appendix B: Tracer Summit BAS Present Value Chart ™ The Tracer Summit BAS present value chart is contained in Table Table 61. Tracer Summit BAS SCC present value chart What the Tracer Summit BAS sends to the SCC nviApplicMode heart nviOccSchedule nviEmergOverride Tracer Summit BAS present value...

  • Page 93: Appendix C: Mode Control Operation

    Appendix C: Mode Control Operation Mode control operation is described in these tables: • Table 62; Space temperature control VAV unit operation • Table 63; Ventilation flow control and flow tracking VAV unit operation Table 62. Space temperature control VAV unit operation a, c nvoHeatCool nvi Applic...
  • Page 94 Appendix C: Mode Control Operation Table 62. Space temperature control VAV unit operation (continued) a, c nvoHeatCool nvi Applic nvoUnitStatus. nvoEffect Temp control Mode nvi Heat Cool mode Occup Output Operation sequence Unoccupied Air valve Enabled Morning warm- Occupied Reheat Enabled...
  • Page 95 Appendix C: Mode Control Operation Table 62. Space temperature control VAV unit operation (continued) a, c nvoHeatCool nvi Applic nvoUnitStatus. nvoEffect Temp control Mode nvi Heat Cool mode Occup Output Operation sequence Zone demand Power-up Cool Cool is cool d STC occupied/unoccupied cool...
  • Page 96 Appendix C: Mode Control Operation Table 63. Ventilation flow control and flow tracking VAV unit operation nvoHeatCool nvoUnitStatus.mo nviApplicMode nviHeatCool nvoEffectOccup Outputs Operation Ventilation Ventilation requirements are Requirements Ventilation requirements are enforced waived (air valve (Vent req) may close) b.Ventilation flow control VAV boxes can have reheat. Flow tracking VAV boxes never have reheat. CNT-SVX17G-EN...

  • Page 97: Appendix D: Reheat Actuation Schedule Tables

    Appendix D: Reheat Actuation Schedule Tables The purpose of this appendix is to provide greater detail regarding the reheat output stages. Reheat can be controlled either by responding directly to a zone temperature error or by running a proportional integral derivative (PID) loop that provides a modulating capacity output, a modulating duty cycle, or a binary output.

  • Page 98: Effect Of Communicated Auxiliary Heat Enable On Reheat

    Appendix D: Reheat Actuation Schedule Tables Effect of Communicated Auxiliary Heat Enable on Reheat The Effect of communicated auxiliary heat enable value on heat outputs is described in Table Table 64. Effect of communicated auxiliary heat enable value on heat outputs Configuration Commu nicated...
  • Page 99 Appendix D: Reheat Actuation Schedule Tables Table 64. Effect of communicated auxiliary heat enable value on heat outputs (continued) Configuration Commu nicated Total auxiliar number y heat Unit status, of heat enable heat_output_ Local Remote stages value Stage 1 Stage 2 Stage 3 secondary Enabled: Limited...
  • Page 100 Appendix D: Reheat Actuation Schedule Tables Table 64. Effect of communicated auxiliary heat enable value on heat outputs (continued) Configuration Commu nicated Total auxiliar number y heat Unit status, of heat enable heat_output_ Local Remote stages value Stage 1 Stage 2 Stage 3 secondary Enabled.
  • Page 101 Appendix D: Reheat Actuation Schedule Tables Table 64. Effect of communicated auxiliary heat enable value on heat outputs (continued) Configuration Commu nicated Total auxiliar number y heat Unit status, of heat enable heat_output_ Local Remote stages value Stage 1 Stage 2 Stage 3 secondary Enabled.

  • Page 102: Reheat Actuation Schedule With No Fan Present

    Appendix D: Reheat Actuation Schedule Tables Reheat Actuation Schedule With No Fan Present The reheat actuation operation with no fan present is described in the following tables: • Table 65; Local heat only with no fan present • Table 66; Remote heat only with no fan present •...
  • Page 103 Appendix D: Reheat Actuation Schedule Tables Table 67. Local and remote heat with local priority and no fan present Configuration Method of control Local Remote Stage 1 Stage 2 Stage 3 Remote capacity Local PI capacity loop Remote heat capacity = 1/2 or Local heat capacity = 1/2 or 2/3 of total capacity...
  • Page 104 Appendix D: Reheat Actuation Schedule Tables Table 68. Local and remote heat with remote priority and no fan present Configuration Method of control Local Remote Stage 1 Stage 2 Stage 3 Remote thermostatic Local thermostatic Not applicable On: Zt < HSP On: Zt <...

  • Page 105: Reheat Actuation Schedule With Parallel Fan Present

    Appendix D: Reheat Actuation Schedule Tables Reheat Actuation Schedule With Parallel Fan Present Fan powered units only have two outputs available for reheat, the third output is occupied by the fan output. The series fan runs whenever the airflow is greater than zero. The parallel fan runs intermittently, as the first stage of reheat.
  • Page 106 Appendix D: Reheat Actuation Schedule Tables Table 70. Local and remote heat with local heat priority and parallel fan present (continued) Configuration Method of control Local Remote Stage 1 Stage 2 Stage 3 Remote PI capacity loop Modulating hot Remote modulating valve capacity = Total capacity Fan priority Parallel fan water...

  • Page 107: Index

    11 green status LED 80 equipment supported binary outputs 22 red service LED 79 non-Trane VAV equipment 6 binary output overrides 22 service push button 79 Trane VAV equipment 6 heat and fan binary outputs 22 yellow Comm LED 80...
  • Page 108 45 Trane VAV equipment 6 non-supported equipment 7 reheat actuation schedule with a non-supported products 7 parallel fan present 48 Tracer VV550/VV551 description 6 reheat actuation schedule with Trane Comm5 devices 39 occupancy 34 no fan present 48 triac 22...
  • Page 109 Index zone sensor inputs 18 10k ohm thermistor 19 internal and external space setpoint adjustment 19 service pin message request 19 single star and double star thumbwheel settings 21 space temperature failure diagnostic request 19 timed override cancel request 18 timed override On request 18 zone sensor air balance request 19...
  • Page 110 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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