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Make-up air unit controls (heating and ventilating unit) · BACnet points list
AbsolutAire UC-3 HTLV control system (heating and ventilating) BACnet points list
Updated 12 November 2026
The UC-3 HTLV is AbsolutAire's controller for heat-and-vent make-up air units: it runs the burner to hold a discharge or space temperature, with occupied/unoccupied setpoints, a low-temperature limit and a mild-weather heat lockout. It joins a BACnet MS/TP network with the MAC address set on DIP switches. The BMS enables the unit through NetworkUnitEnable, sets occupancy and vent/heat mode, and writes the space and discharge setpoints.
This page lists 37 BACnet objects for the AbsolutAire UC-3 HTLV control system (heating and ventilating) — 13 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 HTLV control system (heating and ventilating)
- Equipment
- Make-up air unit controls (heating and ventilating unit)
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 37 (13 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 HTLV, UC-3 HT/LV, HTLV, Smart-Vue, UC-3 HTLV User Guide 010622
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 HTLV control system (heating and ventilating)
Write NetworkUnitEnable = 2 to run the unit (the guide marks it as the point to enable the unit), then set NetworkOccupancy and HVAC_Mode and the occupied/unoccupied space or discharge setpoints. Read the current temperatures, burner command and status, and the multistate alarms; BurnerReset clears a lockout when its value is changed.
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 51 | NetworkUnitEnable | Unit enable: 1 off, 2 on | Write |
| MV 52 | NetworkOccupancy | 1 occupied, 2 unoccupied, 3 follow schedule | Write |
| MV 53 | HVAC_Mode | 1 vent, 2 heat | Write |
| AV 51 | OccupiedSpaceSetPoint | Occupied space temperature setpoint, °F | Write |
| AV 53 | DischargeTempSetPoint | Discharge temperature setpoint, °F | Write |
| MV 15 | CurrentBurnerStatus | Burner status (ENABLE / OFF) | Read |
| AV 35 | CurrentDischargeTemperature | Discharge air temperature | Read |
| AV 33 | CurrentSpaceTemperature | Space temperature | Read |
| MV 12 | BurnerLockoutAlarm | Burner lockout | Read |
| MV 11 | MotorNotRespondingAlarm | Fan motor did not start | Read |
Enable & remote start
NetworkUnitEnable (MV 51): 1 = off, 2 = on. The guide marks it as the point to use to enable the unit.
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 outputs or the [DO NOT WRITE] configuration objects; the Override Output MVs alarm when an output has a network override.
- BurnerReset acts on a change of value (1 to 2 or 2 to 1), not on a fixed value.
AbsolutAire UC-3 HTLV 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 | DesignTempRise | Unit design temperature rise (configuration, do not write) | °F | Read | |
| AV | 32 | CurrentBurnerCommand | Current burner command (do not write) | % | Read | |
| AVmin | 33 | CurrentSpaceTemperature | Current space temperature (do not write) | °F | Read | |
| AV | 34 | CurrentOutsideTemperature | Current outside temperature (do not write) | °F | Read | |
| AVmin | 35 | CurrentDischargeTemperature | Current discharge temperature (do not write) | °F | Read | |
| AVmin | 51 | OccupiedSpaceSetPoint | Occupied space temperature setpoint | °F | Write | |
| AV | 52 | UnoccupiedSpaceSetPoint | Unoccupied space temperature setpoint | °F | Write | |
| AVmin | 53 | DischargeTempSetPoint | Discharge temperature setpoint | °F | Write | |
| AV | 54 | MinimumDischargeTemp | Minimum allowed discharge temperature | °F | Write | |
| AV | 55 | MaximumDischargeTemp | Maximum allowed discharge temperature | °F | Write | |
| AV | 56 | LowTempAlarmSetPoint | Low temperature alarm setpoint | °F | Write | |
| AV | 57 | LowTempAlarmDelayMinutes | Low temperature alarm delay | min | Write | |
| AV | 58 | network_ControlDeadband | Space temperature control deadband | °F | Write | |
| AV | 59 | network_HeatLockout | Heat lockout setpoint (mild weather) | °F | Write | |
| BV | 1 | Space Sensor Type | Space sensor type (configuration, do not write) | Read | Boolean (REMOTE WIRED;HMI SENSOR) | |
| BV | 2 | ScheduleAvailable | Schedule available (configuration, do not write) | Read | Boolean (YES;NO) | |
| BV | 3 | LTL_Available | Low temperature alarm available (configuration) | Read | Boolean (YES;NO) | |
| BV | 4 | HeatLockoutAvailable | Heat lockout available (configuration) | Read | Boolean (YES;NO) | |
| MV | 1 | Override Output 1 | Network override alarm on hardware output 1 | Read | Enumeration ALARM / NORMAL | |
| MV | 2 | Override Output 3 | Network override alarm on hardware output 3 | Read | Enumeration ALARM / NORMAL | |
| MV | 3 | Override Output 4 | Network override alarm on hardware output 4 | Read | Enumeration ALARM / NORMAL | |
| MV | 4 | Override Output 5 | Network override alarm on hardware output 5 | Read | Enumeration ALARM / NORMAL | |
| MV | 5 | Override Output 12 | Network override alarm on hardware output 12 | Read | Enumeration ALARM / NORMAL | |
| MV | 6 | BurnerNotRespondingAlarm | Burner not responding alarm | Read | Enumeration ALARM / NORMAL | |
| MV | 7 | BurnerWatchdogAlarm | Burner watchdog alarm | Read | Enumeration ALARM / NORMAL | |
| MV | 8 | SpaceTempSensorAlarm | Space temperature sensor alarm | Read | SensorReliability enumeration | |
| MV | 9 | OutsideTempSensorAlarm | Outside temperature sensor alarm | Read | SensorReliability enumeration | |
| MV | 10 | DischargeTempSensorAlarm | Discharge temperature sensor alarm | Read | SensorReliability enumeration | |
| MVmin | 11 | MotorNotRespondingAlarm | Fan motor not responding alarm | Read | Enumeration ALARM / NORMAL | |
| MVmin | 12 | BurnerLockoutAlarm | Burner lockout alarm | Read | Enumeration LOCKOUT / NORMAL | |
| MV | 13 | DirtyFilterAlarm | Dirty filter alarm | Read | Enumeration DIRTY / CLEAN | |
| MV | 14 | LowTempLockoutAlarm | Low temperature lockout alarm | Read | Enumeration ALARM / NORMAL | |
| MVmin | 15 | CurrentBurnerStatus | Current burner status | Read | Enumeration ENABLE / OFF | |
| MVmin | 51 | NetworkUnitEnable | Unit enable command | Write | 1=Off, 2=On | |
| MVmin | 52 | NetworkOccupancy | Occupancy command | Write | 1=Occupied, 2=Unoccupied, 3=Follow schedule | |
| MVmin | 53 | HVAC_Mode | HVAC mode | Write | 1=Vent, 2=Heat | |
| MV | 54 | BurnerReset | Burner reset (change 1 to 2 or 2 to 1) | Write |
No points match these filters.
Object ID lookup: AbsolutAire UC-3 HTLV control system point IDs by name
AV1DesignTempRiseAV32CurrentBurnerCommandAV33CurrentSpaceTemperatureAV34CurrentOutsideTemperatureAV35CurrentDischargeTemperatureAV51OccupiedSpaceSetPointAV52UnoccupiedSpaceSetPointAV53DischargeTempSetPointAV54MinimumDischargeTempAV55MaximumDischargeTempAV56LowTempAlarmSetPointAV57LowTempAlarmDelayMinutesAV58network_ControlDeadbandAV59network_HeatLockoutBV1Space Sensor TypeBV2ScheduleAvailableBV3LTL_AvailableBV4HeatLockoutAvailableMV1Override Output 1MV2Override Output 3MV3Override Output 4MV4Override Output 5MV5Override Output 12MV6BurnerNotRespondingAlarmMV7BurnerWatchdogAlarmMV8SpaceTempSensorAlarmMV9OutsideTempSensorAlarmMV10DischargeTempSensorAlarmMV11MotorNotRespondingAlarmMV12BurnerLockoutAlarmMV13DirtyFilterAlarmMV14LowTempLockoutAlarmMV15CurrentBurnerStatusMV51NetworkUnitEnableMV52NetworkOccupancyMV53HVAC_ModeMV54BurnerReset
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' (24 rows) without a BACnet object type; they are left out. The guide marks the outputs do-not-write.
- For most multistate objects the guide gives only the enumeration names (e.g. ALARM / NORMAL), not the state numbers; NetworkUnitEnable, NetworkOccupancy and HVAC_Mode numbers are printed in the guide.
- Several AV/BV objects are marked [DO NOT WRITE] configuration values.
- Sensor alarm MVs use the controller's SensorReliability enumeration, which the guide does not list.
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 HTLV 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 HTLV control system (heating and ventilating)
How many BACnet points does the AbsolutAire UC-3 HTLV control system (heating and ventilating) have?
This list has 37 BACnet objects: 14 analog values, 4 binary values, 19 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which AbsolutAire UC-3 HTLV control system (heating and ventilating) BACnet points are writable?
13 of the 37 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 HTLV control system (heating and ventilating) BACnet documentation?
The source is UC-3 HTLV User Guide - Network Integration / Network Points List (UC-3 HTLV User Guide 010622), published free by AbsolutAire at https://www.absolutaire.com/wp-content/uploads/uc-3_htlv_user_guide_0.pdf.
What are the minimum BACnet points to integrate the AbsolutAire UC-3 HTLV control system (heating and ventilating)?
Start with MV 51 NetworkUnitEnable (Unit enable: 1 off, 2 on); MV 52 NetworkOccupancy (1 occupied, 2 unoccupied, 3 follow schedule); MV 53 HVAC_Mode (1 vent, 2 heat); AV 51 OccupiedSpaceSetPoint (Occupied space temperature setpoint, °F); AV 53 DischargeTempSetPoint (Discharge temperature setpoint, °F); MV 15 CurrentBurnerStatus (Burner status (ENABLE / OFF)); AV 35 CurrentDischargeTemperature (Discharge air temperature); AV 33 CurrentSpaceTemperature (Space temperature); MV 12 BurnerLockoutAlarm (Burner lockout); MV 11 MotorNotRespondingAlarm (Fan motor did not start).
How do I enable BMS control of the AbsolutAire UC-3 HTLV control system (heating and ventilating)?
NetworkUnitEnable (MV 51): 1 = off, 2 = on. The guide marks it as the point to use to enable the unit.
How do I check these points on the real UC-3 HTLV 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
- 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 / heating and ventilating unit controller
AbsolutAire UC-3 control system
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 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 HTLV User Guide - Network Integration / Network Points List · UC-3 HTLV User Guide 010622. Object names, instances and units are reproduced as published; descriptions are our own.