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Make-up air unit controls (heating and ventilating unit) · BACnet points list
AbsolutAire UC-3 Lite control system (heating and ventilating) BACnet points list
Updated 12 November 2026
The UC-3 Lite is AbsolutAire's simpler heat-and-vent unit controller, running the burner to a space or discharge temperature with optional VFD and mixed-air damper. It joins a BACnet MS/TP network with its MAC address set on DIP switches. The BMS turns the unit off, on or to auto with network_UnitEnableCommand, sets occupancy, mode and heat setpoints, and can send its own space temperature.
This page lists 50 BACnet objects for the AbsolutAire UC-3 Lite control system (heating and ventilating) — 17 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
- UC-3 Lite control system (heating and ventilating)
- Equipment
- Make-up air unit controls (heating and ventilating unit)
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 50 (17 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 3640 followed by the MAC address (MAC 25 = 364025)
- Also known as
- UC-3 Lite, UC-3 LITE, Smart-Vue, UC-3 Lite User Guide 091121
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 UC-3 Lite control system (heating and ventilating)
Use network_UnitEnableCommand (the guide marks it as the point to command the unit on and off) with OFF, ON or AUTO, then set occupancy, HVAC mode and the occupied/unoccupied heat setpoints. If the BMS supplies the space temperature, write network_SpaceTemperatureOverride (255 returns control to the local sensor). Watch fan and burner status and the alarm BVs.
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 |
|---|---|---|---|
| MV 11 | network_UnitEnableCommand | Unit command: OFF / ON / AUTO | Write |
| BV 11 | network_OccupancyCommand | 0 occupied, 1 unoccupied | Write |
| BV 12 | network_HVAC_Mode | 0 vent, 1 heat | Write |
| AV 26 | network_OccupiedHeatSetPoint | Occupied heat setpoint, 55-150 °F | Write |
| AV 33 | network_SpaceTemperatureOverride | Space temp from the BMS; 255 = use local sensor | Write |
| BV 1 | FanStatus | Fan running status | Read |
| BV 23 | BurnerStatus | Burner on/off status | Read |
| AV 3 | DischargeTemperature | Discharge air temperature | Read |
| BV 4 | BurnerLockoutAlarm | Burner lockout | Read |
| BV 8 | MotorNotRespondingAlarm | Fan motor did not start | Read |
Enable & remote start
network_UnitEnableCommand (MV 11): OFF / ON / AUTO. The guide marks it as the point to command the unit on and off; AUTO cycles the unit per BV 14 and BV 15.
Sensors & values from the BMS
network_SpaceTemperatureOverride (AV 33) replaces the local space sensor with an averaged or network temperature; write 255 to go back to the local sensor. AV 6 shows the value in use.
Network setup
- The MS/TP MAC address is set on the controller's DIP switches (switch 1 = least significant bit).
- Baud rate is detected automatically after a power cycle.
- Device instance = 3640 followed by the MAC address (MAC 25 gives 364025).
Watch out for
- Do not write the hardware I/O or factory configuration objects; the override alarm BVs trip when a hardware output is overridden from the network.
- LowDischargeTempAlarm is reset by commanding the unit off and then on.
- Burner reset works on a change of state of BV 24.
AbsolutAire UC-3 Lite control system (heating and ventilating) 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 | |||||
|---|---|---|---|---|---|---|
| AV | 1 | UnitDesignTempRise | Unit design temperature rise (factory configuration) | °F | Read | |
| AV | 2 | SpaceTemperatureSensor | Space temperature (local sensor) | °F | Read | |
| AVmin | 3 | DischargeTemperature | Discharge temperature | °F | Read | |
| AV | 4 | OutsideTemperature | Outside temperature | °F | Read | |
| AV | 5 | BurnerCommand | Burner modulation command | % | Read | |
| AV | 6 | ControlSpaceTemperature | Space temperature in use (AV 2, or AV 33 when overridden) | °F | Read | |
| AV | 7 | Custom RA Percent | Custom return air percent (factory configuration) | % | Read | |
| AV | 8 | Custom OA Percent | Custom outside air percent (factory configuration) | % | Read | |
| AVmin | 26 | network_OccupiedHeatSetPoint | Occupied heat setpoint (55-150 °F) | °F | Write | |
| AV | 27 | network_UnoccupiedHeatSetPoint | Unoccupied heat setpoint (55-150 °F) | °F | Write | |
| AV | 28 | network_MinimumDischargeTemp | Minimum discharge temperature (45-90 °F) | °F | Write | |
| AV | 29 | network_MaximumDischargeTemp | Maximum discharge temperature (up to 150 °F) | °F | Write | |
| AV | 30 | network_HeatLockoutSetPoint | Heat lockout: burner off above this OA temperature | °F | Write | |
| AV | 31 | network_LowTempAlarmSetPoint | Low temperature lockout alarm setpoint (35-70 °F) | °F | Write | |
| AV | 32 | network_LowTempAlarmDelayTime | Low temperature alarm delay (2-15 min) | min | Write | |
| AVmin | 33 | network_SpaceTemperatureOverride | Space temperature from the network (255 = use local sensor) | °F | Write | |
| AV | 34 | network_VFD_SpeedCommand | VFD speed command (VFD units only) | % | Write | |
| AV | 35 | network_DamperCommand | Mixed air damper command (return air units only) | % | Write | |
| BVmin | 1 | FanStatus | Unit fan status | Read | Boolean (ON;OFF) | |
| BV | 2 | UseSpaceSensorHMI | Use local space sensor (factory configuration) | Read | Boolean (YES;NO) | |
| BV | 3 | Use_LTL | Low temperature lockout feature fitted (factory configuration) | Read | Boolean (YES;NO) | |
| BVmin | 4 | BurnerLockoutAlarm | Burner lockout alarm | Read | Boolean (LOCKOUT;NORMAL) | |
| BV | 5 | DirtyFilterAlarm | Dirty filter alarm | Read | Boolean (ALARM;NORMAL) | |
| BV | 6 | UnitEnableStatus | Unit enable status | Read | Boolean (ENABLE;OFF) | |
| BV | 7 | BurnerEnableStatus | Burner enable status | Read | Boolean (ENABLE;OFF) | |
| BVmin | 8 | MotorNotRespondingAlarm | Fan motor not responding alarm | Read | Boolean (ALARM;NORMAL) | |
| BV | 9 | BurnerNotRespondingAlarm | Burner not responding alarm | Read | Boolean (ALARM;NORMAL) | |
| BV | 10 | BurnerWatchdogAlarm | Burner watchdog alarm | Read | Boolean (ALARM;NORMAL) | |
| BVmin | 11 | network_OccupancyCommand | Occupancy command | Write | 0=Occupied, 1=Unoccupied | |
| BVmin | 12 | network_HVAC_Mode | HVAC mode command | Write | 0=Vent (summer), 1=Heat (winter) | |
| BV | 13 | network_ControlType | Control type | Write | 0=Space, 1=Discharge | |
| BV | 14 | network_CycleWhenOccupied | Cycle to space setpoint when occupied | Write | Boolean (YES;NO) | |
| BV | 15 | network_CycleWhenUnoccupied | Cycle to space setpoint when unoccupied | Write | Boolean (YES;NO) | |
| BV | 16 | HardwareOutput_1_OverrideAlarm | Network override alarm, hardware output 1 | Read | Boolean (ALARM;NORMAL) | |
| BV | 17 | HardwareOutput_2_OverrideAlarm | Network override alarm, hardware output 2 | Read | Boolean (ALARM;NORMAL) | |
| BV | 18 | HardwareOutput_3_OverrideAlarm | Network override alarm, hardware output 3 | Read | Boolean (ALARM;NORMAL) | |
| BV | 19 | HardwareOutput_4_OverrideAlarm | Network override alarm, hardware output 4 | Read | Boolean (ALARM;NORMAL) | |
| BV | 20 | HardwareOutput_6_Override | Network override alarm, hardware output 6 | Read | Boolean (ALARM;NORMAL) | |
| BV | 21 | HardwareOutput_8_OverrideAlarm | Network override alarm, hardware output 8 | Read | Boolean (ALARM;NORMAL) | |
| BV | 22 | LowDischargeTempAlarm | Low discharge temperature alarm (unit off then on to reset) | Read | Boolean (ALARM;NORMAL) | |
| BVmin | 23 | BurnerStatus | Burner status | Read | Boolean (ON;OFF) | |
| BV | 24 | network_BurnerResetCommand | Burner reset (toggle the state to reset) | Write | Boolean (RESET;_RESET) | |
| BV | 25 | Use_VFD | Unit has a VFD (factory configuration) | Read | Boolean (YES;NO) | |
| BV | 26 | Use_CO2_Detector | Unit has a CO2 contact (factory configuration) | Read | Boolean (YES;NO) | |
| MV | 1 | SpaceSensorAlarm | Space temperature sensor alarm | Read | SENSOR RELIABILITY enumeration | |
| MV | 2 | DischargeSensorAlarm | Discharge temperature sensor alarm | Read | SENSOR RELIABILITY enumeration | |
| MV | 3 | OutsideSensorAlarm | Outside temperature sensor alarm | Read | SENSOR RELIABILITY enumeration | |
| MV | 4 | Unit OA Percent | Unit design OA (factory configuration) | Read | Config OA Percent enumeration | |
| MV | 5 | ReturnSensorAlarm | Return temperature sensor alarm | Read | SENSOR RELIABILITY enumeration | |
| MVmin | 11 | network_UnitEnableCommand | Unit enable command (OFF / ON / AUTO) | Write | UNIT ENABLE enumeration (OFF/ON/AUTO) |
No points match these filters.
Object ID lookup: AbsolutAire UC-3 Lite control system point IDs by name
AV1UnitDesignTempRiseAV2SpaceTemperatureSensorAV3DischargeTemperatureAV4OutsideTemperatureAV5BurnerCommandAV6ControlSpaceTemperatureAV7Custom RA PercentAV8Custom OA PercentAV26network_OccupiedHeatSetPointAV27network_UnoccupiedHeatSetPointAV28network_MinimumDischargeTempAV29network_MaximumDischargeTempAV30network_HeatLockoutSetPointAV31network_LowTempAlarmSetPointAV32network_LowTempAlarmDelayTimeAV33network_SpaceTemperatureOverrideAV34network_VFD_SpeedCommandAV35network_DamperCommandBV1FanStatusBV2UseSpaceSensorHMIBV3Use_LTLBV4BurnerLockoutAlarmBV5DirtyFilterAlarmBV6UnitEnableStatusBV7BurnerEnableStatusBV8MotorNotRespondingAlarmBV9BurnerNotRespondingAlarmBV10BurnerWatchdogAlarmBV11network_OccupancyCommandBV12network_HVAC_ModeBV13network_ControlTypeBV14network_CycleWhenOccupiedBV15network_CycleWhenUnoccupiedBV16HardwareOutput_1_OverrideAlarmBV17HardwareOutput_2_OverrideAlarmBV18HardwareOutput_3_OverrideAlarmBV19HardwareOutput_4_OverrideAlarmBV20HardwareOutput_6_OverrideBV21HardwareOutput_8_OverrideAlarmBV22LowDischargeTempAlarmBV23BurnerStatusBV24network_BurnerResetCommandBV25Use_VFDBV26Use_CO2_DetectorMV1SpaceSensorAlarmMV2DischargeSensorAlarmMV3OutsideSensorAlarmMV4Unit OA PercentMV5ReturnSensorAlarmMV11network_UnitEnableCommand
Integration notes
- The Network Points List in the guide is printed as an image; values were keyed by hand from the rendered page and checked row by row.
- The table also lists the controller's physical I/O as 'Hardware Input n' / 'Hardware Output n' (14 rows) without a BACnet object type; they are left out. The guide marks them do-not-write.
- For many binary objects the guide prints only the facet text, e.g. Boolean (ALARM;NORMAL), without saying which state is 1; the occupancy, HVAC mode and control-type commands give 0/1 meanings.
- MV 11 network_UnitEnableCommand is OFF / ON / AUTO; the guide does not print the state numbers. AUTO lets the unit cycle per BV 14 and BV 15.
- Objects marked [DO NOT WRITE] or factory configuration are listed as read-only.
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 UC-3 Lite control system (heating and ventilating) 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 UC-3 Lite control system (heating and ventilating)
How many BACnet points does the AbsolutAire UC-3 Lite control system (heating and ventilating) have?
This list has 50 BACnet objects: 18 analog values, 26 binary values, 6 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which AbsolutAire UC-3 Lite control system (heating and ventilating) BACnet points are writable?
17 of the 50 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 UC-3 Lite control system (heating and ventilating) BACnet documentation?
The source is UC-3 Lite User Guide - Network Integration / Network Points List (UC-3 Lite User Guide 091121), published free by AbsolutAire at https://www.absolutaire.com/wp-content/uploads/uc-3_lite_user_guide.pdf.
What are the minimum BACnet points to integrate the AbsolutAire UC-3 Lite control system (heating and ventilating)?
Start with MV 11 network_UnitEnableCommand (Unit command: OFF / ON / AUTO); BV 11 network_OccupancyCommand (0 occupied, 1 unoccupied); BV 12 network_HVAC_Mode (0 vent, 1 heat); AV 26 network_OccupiedHeatSetPoint (Occupied heat setpoint, 55-150 °F); AV 33 network_SpaceTemperatureOverride (Space temp from the BMS; 255 = use local sensor); BV 1 FanStatus (Fan running status); BV 23 BurnerStatus (Burner on/off status); AV 3 DischargeTemperature (Discharge air temperature); BV 4 BurnerLockoutAlarm (Burner lockout); BV 8 MotorNotRespondingAlarm (Fan motor did not start).
How do I enable BMS control of the AbsolutAire UC-3 Lite control system (heating and ventilating)?
network_UnitEnableCommand (MV 11): OFF / ON / AUTO. The guide marks it as the point to command the unit on and off; AUTO cycles the unit per BV 14 and BV 15.
Can the BMS supply sensor values to the AbsolutAire UC-3 Lite control system (heating and ventilating)?
network_SpaceTemperatureOverride (AV 33) replaces the local space sensor with an averaged or network temperature; write 255 to go back to the local sensor. AV 6 shows the value in use.
How do I check these points on the real UC-3 Lite control system (heating and ventilating)?
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
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Source: UC-3 Lite User Guide - Network Integration / Network Points List · UC-3 Lite User Guide 091121. Object names, instances and units are reproduced as published; descriptions are our own.