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Make-up air / heating and ventilating unit controller · BACnet points list
AbsolutAire TC-3 control system BACnet points list
Updated 6 November 2026
The TC-3 is a smaller unit controller for AbsolutAire heating and ventilating units with burner control, OA/RA dampers and optional 0-10 V setpoint input. It joins a BACnet MS/TP network with a device instance built from its DIP-switch MAC address. The BMS writes network unit and burner enables, occupancy, heat setpoints and an optional network space temperature, and reads temperatures, burner command and sensor alarms.
This page lists 26 BACnet objects for the AbsolutAire TC-3 control system — 9 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from AbsolutAire’s own free documentation, linked below.
- Manufacturer
- AbsolutAire
- Model
- TC-3 control system
- Equipment
- Make-up air / heating and ventilating unit controller
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 26 (9 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 3640 followed by the MAC address (e.g. MAC 25 = 364025)
- Also known as
- TC-3, Smart-Vue
Reference only, provided as-is: verify against AbsolutAire’s current documentation and the live device before use. Not official AbsolutAire information. Terms of use.
BMS integration notes: AbsolutAire TC-3 control system
Write network_UnitEnable (BV 47) and network_BurnerEnable (BV 48) to run the unit, network_Occupancy (AV 84) for occupancy and the heat setpoints (AV 82/85). Writing 255 to AV 84 returns to the local schedule and 255 to AV 83 releases the network space temperature. Read discharge and space temperatures, the burner command and the sensor alarms.
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.
| Object | Name | Why | Access |
|---|---|---|---|
| BV 47 | network_UnitEnable | Unit enable from the BMS | Write |
| BV 48 | network_BurnerEnable | Burner enable from the BMS | Write |
| AV 84 | network_Occupancy | Occupancy: 0=Occ, 1=Unocc, 255=schedule | Write |
| AV 82 | network_OccHeatSetPoint | Occupied heat setpoint, 55-150 °F | Write |
| AV 27 | DischargeTemperature | Discharge air temperature | Read |
| AV 24 | SpaceTemperature | Space temperature | Read |
| AV 30 | BurnerOutputCommand | Burner command, % | Read |
| MV 3 | DischargeSensorAlarm | Discharge sensor fault | Read |
Enable & remote start
BV 47 network_UnitEnable and BV 48 network_BurnerEnable start the unit and burner; they are only used when the factory settings BV 5 UseFanEnable and BV 6 UseBurnerEnable are YES.
Sensors & values from the BMS
AV 83 network_SpaceTemperature replaces the local space sensor; write 255 for null (use local). AV 84 network_Occupancy overrides the schedule (255 = local schedule).
Network setup
- BACnet MS/TP only. The controller detects the network baud rate after a power cycle.
- MAC address is set on the 8 DIP switches on the controller (switch 1 = LSB, binary). Units ship with a factory MAC, incremented per unit on a project.
- Device instance is fixed at 3640 followed by the MAC address (MAC 25 = 364025); change the MAC to fix a duplicate instance.
Watch out for
- BV 1-6 and MV 1 are factory configuration; do not write them.
- Do not write the hardware points; the guide marks them do-not-write.
AbsolutAire TC-3 control system 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.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AVmin | 24 | SpaceTemperature | Current space temperature | °F | Read | |
| AV | 25 | OutsideTemperature | Current outside temperature | °F | Read | |
| AV | 26 | ReturnTemperature | Current return air temperature | °F | Read | |
| AVmin | 27 | DischargeTemperature | Current discharge air temperature | °F | Read | |
| AVmin | 30 | BurnerOutputCommand | Current burner command | % | Read | |
| AVmin | 82 | network_OccHeatSetPoint | Occupied heat setpoint, 55-150 °F | °F | Write | |
| AV | 83 | network_SpaceTemperature | Network space temperature; 255 = null (use local) | °F | Write | |
| AVmin | 84 | network_Occupancy | Occupancy: 0=Occupied, 1=Unoccupied, 255 = local schedule | °F | Write | |
| AV | 85 | network_UnoccHeatSetPoint | Unoccupied heat setpoint, 55-150 °F | °F | Write | |
| AV | 88 | network_MinimumDischarge | Minimum discharge temperature (default 55 °F) | °F | Write | |
| AV | 89 | network_MaximumDischarge | Maximum discharge temperature (default 90 °F) | °F | Write | |
| BV | 1 | SpaceSensorType | Factory config, do not write: 0=HMI, 1=Remote wired | Read | Active=Remote Wired, Inactive=HMI | |
| BV | 2 | SetPointConfig | Factory config, do not write: 0=HMI, 1=VDC | Read | Active=VDC, Inactive=HMI | |
| BV | 3 | IsSchedAvailable | Factory config, do not write: scheduling available | Read | Active=YES, Inactive=NO | |
| BV | 4 | UseCO2_Detector | Factory config, do not write: CO2 detector used | Read | Active=YES, Inactive=NO | |
| BV | 5 | UseFanEnable | Factory config, do not write: use network fan enable point | Read | Active=YES, Inactive=NO | |
| BV | 6 | UseBurnerEnable | Factory config, do not write: use network burner enable point | Read | Active=YES, Inactive=NO | |
| BV | 44 | network_ControlType | Control type: 0=Discharge, 1=Space | Write | Active=Space, Inactive=Discharge | |
| BVmin | 47 | network_UnitEnable | Network unit enable | Write | Active=On, Inactive=Off | |
| BVmin | 48 | network_BurnerEnable | Network burner enable | Write | Active=On, Inactive=Off | |
| MV | 1 | OA_Percent | Factory config, do not write: outside air 1=100 %, 2=20 %, 3=15 % | Read | 1=100, 2=20, 3=15 | |
| MVmin | 3 | DischargeSensorAlarm | Discharge temperature sensor alarm (enum SensorReliability) | Read | ||
| MV | 4 | SpaceSensorAlarm | Space temperature sensor alarm (enum SensorReliability) | Read | ||
| MV | 5 | OutsideSensorAlarm | Outside temperature sensor alarm (enum SensorReliability) | Read | ||
| MV | 6 | ReturnSensorAlarm | Return temperature sensor alarm (enum SensorReliability) | Read | ||
| MV | 8 | DamperFeedbackAlarm | Damper feedback alarm (enum SensorReliability) | Read |
No points match these filters.
Object ID lookup: AbsolutAire TC-3 control system point IDs by name
AV24SpaceTemperatureAV25OutsideTemperatureAV26ReturnTemperatureAV27DischargeTemperatureAV30BurnerOutputCommandAV82network_OccHeatSetPointAV83network_SpaceTemperatureAV84network_OccupancyAV85network_UnoccHeatSetPointAV88network_MinimumDischargeAV89network_MaximumDischargeBV1SpaceSensorTypeBV2SetPointConfigBV3IsSchedAvailableBV4UseCO2_DetectorBV5UseFanEnableBV6UseBurnerEnableBV44network_ControlTypeBV47network_UnitEnableBV48network_BurnerEnableMV1OA_PercentMV3DischargeSensorAlarmMV4SpaceSensorAlarmMV5OutsideSensorAlarmMV6ReturnSensorAlarmMV8DamperFeedbackAlarm
Integration notes
- Taken from the Network Points List (p10) of the TC-3 user guide, which is printed as an image; the values were read by OCR and checked row by row against the page.
- AbsolutAire's table also lists the controller's physical I/O as 'Hardware Input n' / 'Hardware Output n' (14 rows) without a BACnet object type, so they are left out. The guide marks them do-not-write; use the network_ values and status objects instead.
- The guide prints the description of BV 47 and BV 48 as a copy of the Control Type text; the descriptions here follow the object names (network unit enable, network burner enable).
- AV 84 network_Occupancy is printed with degrees-Fahrenheit units although it carries an occupancy code; kept as printed.
- BV 5/BV 6 (factory set) decide whether the network fan and burner enable points are used.
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 TC-3 control system 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 AbsolutAire TC-3 control system
How many BACnet points does the AbsolutAire TC-3 control system have?
This list has 26 BACnet objects: 11 analog values, 9 binary values, 6 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which AbsolutAire TC-3 control system BACnet points are writable?
9 of the 26 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.
Where is the official AbsolutAire TC-3 control system BACnet documentation?
The source is TC-3 User Guide - Network Integration / Network Points List (TC-3 User Guide 091621), published free by AbsolutAire at https://absolutaire.com/sites/default/files/public/pdfs/tc-3_user_guide.pdf.
What are the minimum BACnet points to integrate the AbsolutAire TC-3 control system?
Start with BV 47 network_UnitEnable (Unit enable from the BMS); BV 48 network_BurnerEnable (Burner enable from the BMS); AV 84 network_Occupancy (Occupancy: 0=Occ, 1=Unocc, 255=schedule); AV 82 network_OccHeatSetPoint (Occupied heat setpoint, 55-150 °F); AV 27 DischargeTemperature (Discharge air temperature); AV 24 SpaceTemperature (Space temperature); AV 30 BurnerOutputCommand (Burner command, %); MV 3 DischargeSensorAlarm (Discharge sensor fault).
How do I enable BMS control of the AbsolutAire TC-3 control system?
BV 47 network_UnitEnable and BV 48 network_BurnerEnable start the unit and burner; they are only used when the factory settings BV 5 UseFanEnable and BV 6 UseBurnerEnable are YES.
Can the BMS supply sensor values to the AbsolutAire TC-3 control system?
AV 83 network_SpaceTemperature replaces the local space sensor; write 255 for null (use local). AV 84 network_Occupancy overrides the schedule (255 = local schedule).
How do I check these points on the real TC-3 control system?
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 AbsolutAire BACnet points lists
- Energy recovery make-up air unit controller
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AbsolutAire LX-4 control system (JENEsys Edge534 with touch-screen HMI)
AbsolutAire heating, ventilating and make-up air units built with the LX-4 control option (Edge534 controller and touch-screen HMI).
Also known as: LX-4, LX-4 User Guide 072020, JENEsys Edge534, AbsolutAire touch-screen controls - Make-up air unit controls (discharge temperature and humidity)
AbsolutAire PC-3 / LC-3 psychrometric control system
AbsolutAire units with the PC-3 (LC-3) psychrometric control package for discharge temperature, dehumidification, humidification and optional airflow control.
Also known as: PC-3, LC-3, LC-3 Psychrometric Controls Package, Smart-Vue, PC-3 User Guide 010220 - Make-up air / heating and ventilating unit controller
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AbsolutAire gas-fired heating and ventilating (make-up air) units with the UC-3 or IC-3 control system and Smart-Vue user interface.
Also known as: UC-3, IC-3, IC-3 control system, Smart-Vue - Make-up air unit controls (heating and ventilating unit)
AbsolutAire UC-3 HTLV control system (heating and ventilating)
AbsolutAire heating and ventilating units with the UC-3 HTLV control system.
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Source: TC-3 User Guide - Network Integration / Network Points List · TC-3 User Guide 091621. Object names, instances and units are reproduced as published; descriptions are our own.