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VAV box controller · BACnet points list

Trane Symbio 210 VAV BACnet points list

Updated 4 November 2026

Short answer

The Symbio 210 is Trane's programmable VAV box controller. With the factory VAV program it exposes about 120 objects with short instances (AI 1, AV 14, MV 6...). The BAS sends setpoints, sensor values and occupancy through the '... BAS' and '... Request' objects; the BAS value objects ship Out of Service and must be put In Service before the controller uses them. Which objects exist depends on the application (STC, VFC or FTC) and the heat and fan options.

This page lists 118 BACnet objects for the Trane Symbio 210 VAV — 60 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Trane’s own free documentation, linked below.

Manufacturer
Trane
Model
Symbio 210 VAV
Equipment
VAV box controller
Equipment type
VAV boxes & fan coils
BACnet objects
118 (60 writable)
Transport
BACnet MS/TP
Firmware
Not stated
Also known as
Symbio 210, Symbio210, Symbio 210 VAV controller, BAS-SVP043
Source document
Integration Guide: Symbio 210 Programmable Controller for Variable-Air-Volume (VAV) Boxes · BAS-SVP043A-EN · rev. June 2021
Download CSV 118 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Trane’s current documentation and the live device before use. Not official Trane information. Terms of use.

BMS integration notes: Trane Symbio 210 VAV

Integration in brief

Write occupancy to MV 6 Occupancy Request and the space setpoint to AV 27 Space Temperature Setpoint BAS after putting it In Service. Read AV 59 Space Temperature Active, AV 20 Discharge Air Flow and AV 13 Air Flow Setpoint Active. If the BMS supplies space temperature or CO2, put AV 14/AV 22 In Service and rewrite them every 15 minutes.

Minimum points to map

The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.

ObjectNameWhyAccess
MV 6Occupancy RequestOccupancy command from the BMSWrite
MV 4Heat Cool Mode RequestHeat/cool mode command from the BMSWrite
AV 27Space Temperature Setpoint BASSpace setpoint; put In Service before writingWrite
MV 7Occupancy StatusConfirms the occupancy in effectRead
MV 5Heat Cool Mode StatusCurrent heat/cool modeRead
AV 59Space Temperature ActiveSpace temperature used for controlRead
AV 13Air Flow Setpoint ActiveAirflow setpoint in useRead
AV 20Discharge Air FlowMeasured box airflowRead
BV 13Diagnostic: Flow Sensor FailureFlow (pressure) sensor faultRead

Enable & remote start

No enable point. The '... BAS' value objects ship Out of Service and are ignored until the BMS (or Tracer SC) puts them In Service. Symbio UI (Tools > BAS Control Selection) chooses BAS or Local as the source for each sensor and setpoint.

Heartbeat & communication loss

AV 14 Space Temperature BAS and AV 22 Space CO2 Concentration BAS must be written at least every 15 minutes while In Service; otherwise the controller puts the point in fault.

Sensors & values from the BMS

Space temperature goes to AV 14, CO2 to AV 22 and supply air temperature to AV 29, each after putting the object In Service. AV 59, AV 50 and AV 60 show the values in use. Select BAS as the source in Symbio UI BAS Control Selection.

Network setup

Watch out for

Trane Symbio 210 VAV BACnet objects

Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.

Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.

118 of 118 shown
Type
Access
Show
Trane Symbio 210 VAV BACnet Points List
DescriptionStates
AI1Space Temperature LocalTemperature sensor in the space°F or °CRead
AI2Space Temperature Setpoint LocalZone sensor thumbwheel°F or °CRead
AI3Pressure 1Pressure across the flow ring (120% flow = 2 in. H2O)in. H2O or PaRead
AI4Discharge Air TemperatureDischarge air temperature sensor wired to the controller°F or °CRead
AI5Supply Air Temperature LocalSupply air temperature sensor wired to the controller°F or °CRead
AI6Actual Air Valve PositionAir valve position, % open%Read
AI7Actual Reheat PositionReheat valve position, % open%Read
AI8Space CO2 Concentration LocalSpace CO2 concentration in ppmppmRead
AI9Air Valve 1 Stroke TimeAir valve stroke time, millisecondsRead
AI10Minimum Actuator TimeAir valve minimum actuator time, ms (minimum 500)Read
AI11Water Valve Maximum Stroke TimeModulating water heat valve stroke time, msRead
AI12Water Valve Minimum Actuator TimeWater valve minimum actuator time, msRead
AO1Air Valve Drive CommandRequested air valve position, % open%Read
AO2Supply Fan SpeedSupply fan output; single-speed fans 0% = off, 100% = on%Read
AO3Heating Valve CommandRequested modulating reheat valve position%Read
AV2Air Flow Minimum Setpoint ActiveMinimum airflow setpoint in usein. H2O or PaRead
AV8Air Flow Nominal StatusNominal airflow set by configurator based on the unit size selectedin. H2O or PaRead
AV9Reheat Enable Point°F or °CWrite
AV10Auto Changeover Point°F or °CWrite
AV12Heat Output Secondary StatusSecondary heat output, % (valve position, PWM capacity or stage)%Read
AVmin13Air Flow Setpoint Activecfm or L/sRead
AV14Space Temperature BASSpace temperature from the BAS; Out of Service by default°F or °CWrite
AV15Air Flow Override PercentWrite
AV16Discharge Air Temperature Setpoint BASDischarge air setpoint from the BAS (VFC only)°F or °CWrite
AV18Air Flow GainAirflow gain from air balancing, default 1.0Write
AV19Air Flow Measurement OffsetSet when air balancing%Write
AVmin20Discharge Air FlowPressure sensor 1 value converted to flowcfm or L/sRead
AV21Outdoor Air Low LimitVFC freeze protection°F or °CWrite
AV22Space CO2 Concentration BASSpace CO2 from the BAS; Out of Service by defaultppmWrite
AV23Unoccupied Cooling Setpoint°F or °CWrite
AV24Unoccupied Heating Setpoint°F or °CWrite
AV25Air Flow Setpoint BASCommunicated airflow setpoint used for flow tracking unitscfm or L/sWrite
AV26Air Flow OffsetFlow set point of Flow Tracking box relative to supply air VAV boxcfm or L/sWrite
AVmin27Space Temperature Setpoint BASSpace setpoint from the BAS; Out of Service by default°F or °CWrite
AV28Space Temperature Setpoint ActiveSpace temperature setpoint being used by algorithm°F or °CRead
AV29Supply Air Temperature BASSupply air temperature from the BAS; Out of Service by default°F or °CWrite
AV30Occupied OffsetSetpoint offset used during occupied modeΔ°F or Δ°CWrite
AV31Air Flow Setpoint Minimum Local HeatReheat minimum used when local heat is Oncfm or L/sWrite
AV33Occupied Bypass TimeMinutes in occupied bypass after a timed overrideWrite
AV34Standby OffsetSetpoint offset used during occupied standby modeΔ°F or Δ°CWrite
AV35Ventilation Setpoint Activecfm or L/sRead
AV36Ventilation RatioRequired outdoor-air to primary-air ratio, 0-100%%Read
AV37Space Temp Setpoint DefaultDefault space temperature setpoint stored in the controller and set by service tool°F or °CWrite
AV38Ventilation Setpoint Localcfm or L/sWrite
AV39Discharge Air Temp Setpoint LocalDischarge air setpoint from the wired sensor (VFC only)°F or °CWrite
AV40Space CO2 LimitPoint where CO2 demand ventilation ends in ppmppmWrite
AV41Space CO2 Low LimitPoint where CO2 demand ventilation begins in ppmppmWrite
AV42Air Flow Setpoint Minimumcfm or L/sWrite
AV43Air Flow Setpoint Minimum Standbycfm or L/sWrite
AV44Air Flow Setpoint Minimum Standby Heatcfm or L/sWrite
AV45Air Flow Setpoint Minimum Heatcfm or L/sWrite
AV46Air Flow Setpoint Maximum Heatcfm or L/sWrite
AV47Air Flow Setpoint Maximumcfm or L/sWrite
AV48Ventilation Setpoint BASVentilation setpoint from the BAS; Out of Service by defaultcfm or L/sWrite
AV49Ventilation Standby Setpointcfm or L/sWrite
AV50Space CO2 Concentration ActiveSpace CO2 concentration in ppm, used by algorithmppmRead
AV51Ventilation Ratio Limit BASVentilation ratio limit from the BAS; Out of Service by default%Write
AV52PD Mode Min Air Valve PositionMinimum air valve position in percent when using pressure dependent control%Write
AV53ECM Fan Correction FactorECM fan correction factor (ECM fan only)Write
AV54ECM Fan Maximum FlowECM fan maximum flow, factory setcfm or L/sWrite
AV55ECM Fan Minimum FlowECM fan minimum flow, factory setcfm or L/sWrite
AV56ECM Fan Flow SetpointECM fan flow setpointcfm or L/sWrite
AV57Parallel Fan Flow Enable Pointcfm or L/sWrite
AV58Parallel Fan Temp Enable PointΔ°F or Δ°CWrite
AVmin59Space Temperature ActiveSpace temperature being used by algorithm°F or °CRead
AV60Supply Air Temperature Active°F or °CRead
AV66Cabinet StyleRead
AV67Auxiliary Heat Control RequestAuxiliary heat enable - reheat enable%Write
AV68Fan Override BASFan override: 0% off, 1-100% on/ECM speed, 101% = no override%Write
AV69Pressure Sensor Calibration OffsetZero pressure reading saved during calibrationcfm or L/sRead
AV70Fan Air Flow RatingFan airflow rating for ECM fan balancing, factory setcfm or L/sWrite
AV74Auto Commissioning Air Valve 40Percent air valve position at 40%%Read
AV75Auto Commissioning Air Valve 100Percent air valve position at 100%%Read
AV76Auto Commissioning Discharge Air Temperature Fan OffDischarge air temp is recorded during auto commissioning°F or °CRead
AV77Auto Commissioning Discharge Air Temperature Fan OnAuto commissioning discharge air temperature, fan on°F or °CRead
AV78Auto Commissioning Discharge Air Temperature ReheatAuto commissioning discharge air temperature, reheat on°F or °CRead
AV79Auto Commissioning Discharge Air Temperature Water ValveAuto commissioning discharge air temperature, water valve open°F or °CRead
AV80Auto Commissioning Discharge Air Temperature Stage 1 HeatAuto commissioning discharge air temperature, 1 heat stage on°F or °CRead
AV81Auto Commissioning Discharge Air Temperature Stage 2 HeatAuto commissioning discharge air temperature, 2 heat stages on°F or °CRead
AV82Auto Commissioning Discharge Air Temperature Stage 3 HeatAuto commissioning discharge air temperature, 3 heat stages on°F or °CRead
AV83Cool TypeRead
AV84Preheat TypeRead
AV85Reheat TypeRead
AV86Supply Fan TypeRead
AV87Cooling Setpoint High LimitHigh limit for cooling setpoint°F or °CWrite
AV88Cooling Setpoint Low LimitLow limit for cooling setpoint°F or °CWrite
AV89Heating Setpoint High LimitHigh limit for heating setpoint°F or °CWrite
AV90Heating Setpoint Low LimitLow limit for heating setpoint°F or °CWrite
BI1Occupancy InputOccupancy sensorRead
BO1ECM Fan OutputECM fan on/offRead
BO2Fan OutputFan on/off (standard motor)Read
BO5Heat Output 3Heat stage 3Read
BO6Heat Output 2Heat stage 2Read
BO7Heat Output 1Heat stage 1Read
BV1Air Valve Position ControlPressure independent or position (pressure dependent) controlWrite0 = Pressure independent, 1 = Position control / pressure dependent
BV2Default Supply Air Temperature ModeDefault supply air temperature modeWrite0 = Cold (cooling, default), 1 = Hot (heating)
BV3Diagnostic: Air Flow Override LocalLocal thumbwheel is in override position of * or **Read0 = Inactive, 1 = Active
BV5Reheat PriorityReheat priority of local and remote heatWrite
BV6Pressure Dependent Mode Reheat EnableWrite
BV7Diagnostic: Flow Sensor Calibration FailureRead0 = Inactive, 1 = Active
BV8Auto CalibrateWrite
BV9Diagnostic: Low Primary Air FlowLow primary airflow diagnostic (electric heat only)Read0 = Inactive, 1 = Active
BV10Diagnostic: Freeze ProtectionFreeze protection diagnostic (only for ventilation flow control units)Read0 = Inactive, 1 = Active
BV11Auto Commissioning CommandAuto commissioning commandWrite
BV12Diagnostic: High Air FlowFlow sensor reads above 120% of nominal flowRead0 = Inactive, 1 = Active
BVmin13Diagnostic: Flow Sensor FailurePressure sensor faulted diagnosticRead0 = Inactive, 1 = Active
MI1Timed Override StatusTimed override button push detectedRead
MI2Air Flow Override LocalThumbwheel at * or **Read
MV1Air Flow Minimum Setpoint SourceWrite
MV2Air Flow OverrideWrite
MV3Water Valve OverrideWrite
MVmin4Heat Cool Mode RequestHeat/cool mode request from the BASWrite
MVmin5Heat Cool Mode StatusRead
MVmin6Occupancy RequestOccupancy request from the BASWrite
MVmin7Occupancy StatusRead
MV8Auto Commissioning StateRead
MV9Emergency Override BASEmergency override requestWrite
MV12Manual Test SequenceManual Test Sequence numberWrite
Object ID lookup: Trane Symbio 210 VAV point IDs by name

Integration notes

Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the Symbio 210 VAV and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.

Questions about the Trane Symbio 210 VAV

How many BACnet points does the Trane Symbio 210 VAV have?

This list has 118 BACnet objects: 12 analog inputs, 3 analog outputs, 73 analog values, 1 binary input, 5 binary outputs, 12 binary values, 2 multi-state inputs, 10 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Trane Symbio 210 VAV BACnet points are writable?

60 of the 118 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done. The source has no read/write column, so this is inferred from object type.

Where is the official Trane Symbio 210 VAV BACnet documentation?

The source is Integration Guide: Symbio 210 Programmable Controller for Variable-Air-Volume (VAV) Boxes (BAS-SVP043A-EN), revision June 2021, published free by Trane at https://elibrary.tranetechnologies.com/public/commercial-hvac/Literature/Integration/BAS-SVP043B-EN_11242021.pdf.

What are the minimum BACnet points to integrate the Trane Symbio 210 VAV?

Start with MV 6 Occupancy Request (Occupancy command from the BMS); MV 4 Heat Cool Mode Request (Heat/cool mode command from the BMS); AV 27 Space Temperature Setpoint BAS (Space setpoint; put In Service before writing); MV 7 Occupancy Status (Confirms the occupancy in effect); MV 5 Heat Cool Mode Status (Current heat/cool mode); AV 59 Space Temperature Active (Space temperature used for control); AV 13 Air Flow Setpoint Active (Airflow setpoint in use); AV 20 Discharge Air Flow (Measured box airflow); BV 13 Diagnostic: Flow Sensor Failure (Flow (pressure) sensor fault).

How do I enable BMS control of the Trane Symbio 210 VAV?

No enable point. The '... BAS' value objects ship Out of Service and are ignored until the BMS (or Tracer SC) puts them In Service. Symbio UI (Tools > BAS Control Selection) chooses BAS or Local as the source for each sensor and setpoint.

Does the Trane Symbio 210 VAV need a BACnet heartbeat or have a communication timeout?

AV 14 Space Temperature BAS and AV 22 Space CO2 Concentration BAS must be written at least every 15 minutes while In Service; otherwise the controller puts the point in fault.

Can the BMS supply sensor values to the Trane Symbio 210 VAV?

Space temperature goes to AV 14, CO2 to AV 22 and supply air temperature to AV 29, each after putting the object In Service. AV 59, AV 50 and AV 60 show the values in use. Select BAS as the source in Symbio UI BAS Control Selection.

How do I check these points on the real Symbio 210 VAV?

Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.

More Trane BACnet points lists

Source: Integration Guide: Symbio 210 Programmable Controller for Variable-Air-Volume (VAV) Boxes · BAS-SVP043A-EN · rev. June 2021. Object names, instances and units are reproduced as published; descriptions are our own.