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Make-up air / heating and ventilating unit controller · BACnet points list
AbsolutAire UC-3 control system BACnet points list
Updated 6 November 2026
The UC-3 is the unit controller on AbsolutAire heating and ventilating units. It joins a BACnet MS/TP network with a device instance built from its DIP-switch MAC address. The BMS writes network_ values for on/off, occupancy, setpoints, economizer and sensor overrides, and reads temperatures, commands, fan/burner status and alarm objects. The IC-3 user guide prints the identical points table.
This page lists 65 BACnet objects for the AbsolutAire UC-3 control system — 26 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 control system
- Equipment
- Make-up air / heating and ventilating unit controller
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 65 (26 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
- UC-3, IC-3, IC-3 control system, 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 UC-3 control system
Write network_FanCommand (AV 103) to turn the unit on/off, network_Occupancy (AV 134) for occupancy, and the heat/cool setpoints (AV 102-106). Writing 255 to the network space temperature, building pressure or occupancy objects hands control back to the unit's own sensors or schedule. Read fan and burner status (BV 21/22) and the alarm multistates.
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 |
|---|---|---|---|
| AV 103 | network_FanCommand | On/off command: 0=Off, 1=On, 2=Auto | Write |
| AV 134 | network_Occupancy | Occupancy: 0=Occ, 1=Unocc, 255=schedule | Write |
| AV 102 | network_OccHeatSetPoint | Occupied heat setpoint, 55-90 °F | Write |
| AV 105 | network_OccCoolSetPoint | Occupied cool setpoint, 55-90 °F | Write |
| BV 21 | Fan Running Status | Supply fan running | Read |
| BV 22 | Burner Operating Status | Burner on | Read |
| AV 54 | DischargeTemperature | Discharge air temperature | Read |
| AV 51 | SpaceTemperature | Space temperature | Read |
| MV 37 | BurnerLockoutAlarm | Burner lockout alarm | Read |
| MV 39 | MotorNotRespondingAlarm | Fan motor failed to start | Read |
Enable & remote start
AV 103 network_FanCommand is the point the guide says to use to command the unit on and off (0 = Off, 1 = On, 2 = Auto).
Sensors & values from the BMS
AV 132 network_SpaceTemperature and AV 133 network_BuildingPressure override the local sensors; write 255 to return to the local sensor. AV 134 network_Occupancy overrides the schedule (255 = 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
- Do not override the hardware points from the BMS: every override raises a Point Override alarm (BV 54-65). All control is available through the network_ values.
- AV 111 Heat Cool Mode only applies with cooling; AV 112 Heat Vent Mode only without cooling.
- AV 109 manual economizer is not available with the building pressure option.
AbsolutAire UC-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 | |||||
|---|---|---|---|---|---|---|
| AV | 4 | ActiveCoolingStages | Number of active cooling stages | Read | ||
| AV | 5 | Cooling Coil Temperature Sensor | Cooling coil leaving air temperature | °F | Read | |
| AVmin | 51 | SpaceTemperature | Current space temperature | °F | Read | |
| AV | 52 | OutsideTemperature | Current outside temperature | °F | Read | |
| AV | 53 | ReturnTemperature | Current return air temperature | °F | Read | |
| AVmin | 54 | DischargeTemperature | Current discharge air temperature | °F | Read | |
| AV | 55 | BuildingPressure | Current building pressure | inH2O | Read | |
| AV | 56 | EconomizerCommand | Current economizer command | % | Read | |
| AV | 57 | HeatCommand | Current heat (burner) command | % | Read | |
| AV | 58 | Cooling Command | Current cooling command | % | Read | |
| AVmin | 102 | network_OccHeatSetPoint | Occupied heat setpoint, 55-90 °F | °F | Write | |
| AVmin | 103 | network_FanCommand | Unit on/off command: 0=Off, 1=On, 2=Auto | Write | ||
| AV | 104 | network_UnoccHeatSetPoint | Unoccupied heat setpoint, 55-90 °F | °F | Write | |
| AVmin | 105 | network_OccCoolSetPoint | Occupied cool setpoint, 55-90 °F | °F | Write | |
| AV | 106 | network_UnoccCoolSetPoint | Unoccupied cool setpoint, 55-90 °F | °F | Write | |
| AV | 107 | network_BuiildingPressSetPoint | Building pressure setpoint, -0.1 to 0.1 in. w.c. | inH2O | Write | |
| AV | 108 | network_EconomizerOverride | Economizer override 0-100 %, 255 = auto | % | Write | |
| AV | 109 | network_ManualEconPercent | Manual economizer 0-100 %; not with building pressure option | % | Write | |
| AV | 110 | network_TwoSpeedEcon | Two-speed economizer: 0=Low, 1=High | Write | ||
| AV | 111 | network_HeatCoolMode | Mode: 0=Air, 1=Heat, 2=Cool (units with cooling) | Write | ||
| AV | 112 | network_HeatVentMode | Mode: 0=Vent, 1=Heat (units without cooling) | Write | ||
| AV | 113 | network_HeatLockout | Heat lockout setpoint (default 65 °F) | °F | Write | |
| AV | 114 | network_CoolLockout | Cooling lockout setpoint (default 75 °F) | °F | Write | |
| AV | 115 | network_LowTempLimit | Low temperature alarm setpoint (default 40 °F) | °F | Write | |
| AV | 116 | network_LowTempTime | Low temperature alarm delay (default 5 min) | min | Write | |
| AV | 118 | network_MinimumDischarge | Minimum discharge temperature (default 55 °F) | °F | Write | |
| AV | 119 | network_MaximumDischarge | Maximum discharge temperature (default 90 °F) | °F | Write | |
| AV | 122 | network_LowEconomizer | Economizer low limit (default 0 %) | % | Write | |
| AV | 123 | network_HighEconomizer | Economizer high limit (default 100 %) | % | Write | |
| AV | 131 | network_BurnerReset | Burner reset command (toggle on) | Write | ||
| AV | 132 | network_SpaceTemperature | Network space temperature; 255 = use local sensor | °F | Write | |
| AV | 133 | network_BuildingPressure | Network building pressure; 255 = use local sensor | inH2O | Write | |
| AVmin | 134 | network_Occupancy | Occupancy: 0=Occupied, 1=Unoccupied, 255 = schedule | Write | ||
| BV | 16 | CoolingStage_1 | Cooling stage 1 status | Read | Active=On, Inactive=Off | |
| BV | 17 | CoolingStage_2 | Cooling stage 2 status | Read | Active=On, Inactive=Off | |
| BV | 18 | CoolingStage_3 | Cooling stage 3 status | Read | Active=On, Inactive=Off | |
| BV | 19 | CoolingStage_4 | Cooling stage 4 status | Read | Active=On, Inactive=Off | |
| BVmin | 21 | Fan Running Status | Unit fan status | Read | Active=On, Inactive=Off | |
| BVmin | 22 | Burner Operating Status | Unit burner status | Read | Active=On, Inactive=Off | |
| BV | 51 | network_ControlType | Control type: 0=Discharge, 1=Space | Write | Active=Space, Inactive=Discharge | |
| BV | 52 | network_CycleOccupied | Cycle on space temperature when occupied | Write | Active=YES, Inactive=NO | |
| BV | 53 | network_CycleUnoccupied | Cycle on space temperature when unoccupied | Write | Active=YES, Inactive=NO | |
| BV | 54 | HardwareOutput_1_Override | Hardware output 1 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 55 | HardwareOutput_2_Override | Hardware output 2 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 56 | HardwareOutput_3_Override | Hardware output 3 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 57 | HardwareOutput_4_Override | Hardware output 4 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 58 | HardwareOutput_5_Override | Hardware output 5 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 59 | HardwareOutput_6_Override | Hardware output 6 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 60 | HardwareOutput_7_Override | Hardware output 7 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 61 | HardwareOutput_8_Override | Hardware output 8 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 62 | HardwareOutput_9_Override | Hardware output 9 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 63 | HardwareOutput_10_Override | Hardware output 10 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 64 | HardwareOutput_11_Override | Hardware output 11 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| BV | 65 | HardwareOutput_12_Override | Hardware output 12 overridden from the network | Read | Active=Alarm, Inactive=Normal | |
| MV | 31 | DirtyFilterAlarm | Dirty filter alarm (enum Filters) | Read | ||
| MV | 32 | Low_TempAlarm | Low temperature alarm | Read | Alarm / Normal | |
| MV | 33 | DischargeSensorAlarm | Discharge sensor alarm (enum SensorReliability) | Read | ||
| MV | 34 | SpaceSensorAlarm | Space sensor alarm (enum SensorReliability) | Read | ||
| MV | 35 | OutsideSensorAlarm | Outside sensor alarm (enum SensorReliability) | Read | ||
| MV | 36 | ReturnSensorAlarm | Return sensor alarm (enum SensorReliability) | Read | ||
| MVmin | 37 | BurnerLockoutAlarm | Burner lockout alarm | Read | Alarm / Normal | |
| MV | 38 | DamperFeedbackAlarm | Damper feedback alarm (enum SensorReliability) | Read | ||
| MVmin | 39 | MotorNotRespondingAlarm | Supply fan motor not responding alarm | Read | Alarm / Normal | |
| MV | 40 | BurnerNotRespondingAlarm | Burner not responding alarm | Read | Alarm / Normal | |
| MV | 41 | CoolingCoilExitSensorAlarm | Cooling coil sensor alarm (enum SensorReliability) | Read |
No points match these filters.
Object ID lookup: AbsolutAire UC-3 control system point IDs by name
AV4ActiveCoolingStagesAV5Cooling Coil Temperature SensorAV51SpaceTemperatureAV52OutsideTemperatureAV53ReturnTemperatureAV54DischargeTemperatureAV55BuildingPressureAV56EconomizerCommandAV57HeatCommandAV58Cooling CommandAV102network_OccHeatSetPointAV103network_FanCommandAV104network_UnoccHeatSetPointAV105network_OccCoolSetPointAV106network_UnoccCoolSetPointAV107network_BuiildingPressSetPointAV108network_EconomizerOverrideAV109network_ManualEconPercentAV110network_TwoSpeedEconAV111network_HeatCoolModeAV112network_HeatVentModeAV113network_HeatLockoutAV114network_CoolLockoutAV115network_LowTempLimitAV116network_LowTempTimeAV118network_MinimumDischargeAV119network_MaximumDischargeAV122network_LowEconomizerAV123network_HighEconomizerAV131network_BurnerResetAV132network_SpaceTemperatureAV133network_BuildingPressureAV134network_OccupancyBV16CoolingStage_1BV17CoolingStage_2BV18CoolingStage_3BV19CoolingStage_4BV21Fan Running StatusBV22Burner Operating StatusBV51network_ControlTypeBV52network_CycleOccupiedBV53network_CycleUnoccupiedBV54HardwareOutput_1_OverrideBV55HardwareOutput_2_OverrideBV56HardwareOutput_3_OverrideBV57HardwareOutput_4_OverrideBV58HardwareOutput_5_OverrideBV59HardwareOutput_6_OverrideBV60HardwareOutput_7_OverrideBV61HardwareOutput_8_OverrideBV62HardwareOutput_9_OverrideBV63HardwareOutput_10_OverrideBV64HardwareOutput_11_OverrideBV65HardwareOutput_12_OverrideMV31DirtyFilterAlarmMV32Low_TempAlarmMV33DischargeSensorAlarmMV34SpaceSensorAlarmMV35OutsideSensorAlarmMV36ReturnSensorAlarmMV37BurnerLockoutAlarmMV38DamperFeedbackAlarmMV39MotorNotRespondingAlarmMV40BurnerNotRespondingAlarmMV41CoolingCoilExitSensorAlarm
Integration notes
- Taken from the Network Points List (p14) of the UC-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' (24 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 IC-3 user guide (111021, https://www.absolutaire.com/wp-content/uploads/ic_3_user_guide.pdf) prints the same points table image, so it is listed here as an alias.
- Many objects only apply with options fitted (cooling, economizer, building pressure, scheduling); the guide notes which.
- Multistate sensor alarms use the controller's SensorReliability enumeration (no-fault / open / short per the guide).
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 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 UC-3 control system
How many BACnet points does the AbsolutAire UC-3 control system have?
This list has 65 BACnet objects: 33 analog values, 21 binary values, 11 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which AbsolutAire UC-3 control system BACnet points are writable?
26 of the 65 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 control system BACnet documentation?
The source is UC-3 User Guide - Network Integration / Network Points List (UC-3 User Guide 110921), published free by AbsolutAire at https://absolutaire.com/sites/default/files/public/pdfs/uc_3_user_guide.pdf.
What are the minimum BACnet points to integrate the AbsolutAire UC-3 control system?
Start with AV 103 network_FanCommand (On/off command: 0=Off, 1=On, 2=Auto); AV 134 network_Occupancy (Occupancy: 0=Occ, 1=Unocc, 255=schedule); AV 102 network_OccHeatSetPoint (Occupied heat setpoint, 55-90 °F); AV 105 network_OccCoolSetPoint (Occupied cool setpoint, 55-90 °F); BV 21 Fan Running Status (Supply fan running); BV 22 Burner Operating Status (Burner on); AV 54 DischargeTemperature (Discharge air temperature); AV 51 SpaceTemperature (Space temperature); MV 37 BurnerLockoutAlarm (Burner lockout alarm); MV 39 MotorNotRespondingAlarm (Fan motor failed to start).
How do I enable BMS control of the AbsolutAire UC-3 control system?
AV 103 network_FanCommand is the point the guide says to use to command the unit on and off (0 = Off, 1 = On, 2 = Auto).
Can the BMS supply sensor values to the AbsolutAire UC-3 control system?
AV 132 network_SpaceTemperature and AV 133 network_BuildingPressure override the local sensors; write 255 to return to the local sensor. AV 134 network_Occupancy overrides the schedule (255 = schedule).
How do I check these points on the real UC-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
AbsolutAire ER-3 control system (energy recovery)
AbsolutAire heating and ventilating units with plate or heat-pipe heat recovery, supply and exhaust fans, controlled by the ER-3 control system.
Also known as: ER-3, Smart-Vue - Make-up air unit controls (heating, ventilating, optional cooling)
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
AbsolutAire TC-3 control system
AbsolutAire gas-fired heating and ventilating (make-up air) units with the TC-3 control system and Smart-Vue user interface.
Also known as: TC-3, 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.
Also known as: UC-3 HTLV, UC-3 HT/LV, HTLV, Smart-Vue, UC-3 HTLV User Guide 010622 - Make-up air unit controls (heating and ventilating unit)
AbsolutAire UC-3 Lite control system (heating and ventilating)
AbsolutAire heating and ventilating units with the UC-3 Lite control system.
Also known as: UC-3 Lite, UC-3 LITE, Smart-Vue, UC-3 Lite User Guide 091121
Source: UC-3 User Guide - Network Integration / Network Points List · UC-3 User Guide 110921. Object names, instances and units are reproduced as published; descriptions are our own.