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Make-up air unit controls (discharge temperature and humidity) · BACnet points list
AbsolutAire PC-3 / LC-3 psychrometric control system BACnet points list
Updated 12 November 2026
The PC-3 user guide covers AbsolutAire's psychrometric controls package (the preface calls it LC-3), which holds discharge temperature and humidity by cooling to a dew point and reheating, with optional humidification and VFD airflow control. The controller joins a BACnet MS/TP network, finds the baud rate itself and takes its MAC address from DIP switches. The BMS can switch the unit on and off and write discharge temperature, humidity and airflow setpoints.
This page lists 44 BACnet objects for the AbsolutAire PC-3 / LC-3 psychrometric control system — 16 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
- PC-3 / LC-3 psychrometric control system
- Equipment
- Make-up air unit controls (discharge temperature and humidity)
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 44 (16 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 3640 followed by the MAC address (MAC 25 = 364025)
- Also known as
- PC-3, LC-3, LC-3 Psychrometric Controls Package, Smart-Vue, PC-3 User Guide 010220
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 PC-3 / LC-3 psychrometric control system
Set the MAC address on the DIP switches and connect to the BACnet MS/TP trunk; the controller detects the baud rate after a power cycle and its device instance becomes 3640 followed by the MAC. Command the unit with network_FanCommand and write the discharge temperature and humidity setpoints; read the discharge conditions, command outputs and the multistate 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 22 | network_FanCommand | Unit on/off command | Write |
| AV 52 | network_TempSetPoint | Discharge temperature setpoint, °F | Write |
| AV 53 | network_HumiditySetPoint | Discharge humidity setpoint, %RH | Write |
| AV 54 | network_CFM_SetPoint | Discharge airflow setpoint, CFM (airflow option) | Write |
| AV 40 | DischargeTemperature | Discharge air temperature | Read |
| AV 41 | DischargeHumidity | Discharge air humidity | Read |
| AV 36 | OutsideTemperature | Outside air temperature | Read |
| MV 9 | MotorNotRespondingAlarm | Fan did not start within 2 min of a run command | Read |
| MV 7 | PreheatBurnerLockoutAlarm | Preheat burner lockout | Read |
| MV 2 | LowTempAlarm | Low temperature alarm | Read |
Enable & remote start
network_FanCommand (BV 22) turns the unit on and off from the BMS.
Network setup
- MAC address: DIP switches 1-8 on the controller, 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); change the MAC to fix a duplicate instance.
Watch out for
- Write null to network_VFD_Econ_SetPoint to return the VFD to automatic control.
- Burner reset objects are toggled to reset a locked-out burner.
AbsolutAire PC-3 / LC-3 psychrometric 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 | 36 | OutsideTemperature | Outside Temperature | °F | Read | |
| AV | 37 | OutsideHumidity | Outside Air Humidity | %RH | Read | |
| AV | 38 | CoilExitTemperature | Coil Exit Temperature | °F | Read | |
| AV | 39 | PreheatExitTemperature | Preheat exit temperature | °F | Read | |
| AVmin | 40 | DischargeTemperature | Discharge Air Temperature | °F | Read | |
| AVmin | 41 | DischargeHumidity | Discharge Humidity | %RH | Read | |
| AV | 42 | DischargeAirflowCFM | Discharge Airflow CFM | CFM | Read | |
| AV | 43 | CoolingCommand | Cooling command, % | % | Read | |
| AV | 44 | PreheatCommand | Preheat Command Percent | % | Read | |
| AV | 45 | HumiditficationCommand | Humidification command, % | % | Read | |
| AV | 46 | ReheatCommand | Reheat Command Percent | % | Read | |
| AV | 47 | ControlHysteresis | Temperature control hysteresis | °F | Write | |
| AV | 48 | BuildingPressureSetPoint | Building pressure set point for control | inWC | Write | |
| AV | 49 | BuildingPressureSensor | Building pressure sensor | inWC | Read | |
| AV | 50 | network_MinimumEconomizer_VFD | Minimum VFD speed or OA percent | % | Write | |
| AV | 51 | network_MazimumEconomizer_VFD | Maximum VFD speed or OA percent | % | Write | |
| AVmin | 52 | network_TempSetPoint | Discharge Temperature Set Point | °F | Write | |
| AVmin | 53 | network_HumiditySetPoint | Discharge Humidity Set Point | %RH | Write | |
| AVmin | 54 | network_CFM_SetPoint | Discharge airflow setpoint | CFM | Write | |
| AV | 55 | network_VFD_Econ_SetPoint | Manual VFD speed setpoint (null = automatic) | % | Write | |
| AV | 56 | network_PreHeatBurnerReset | Preheat burner reset (toggle to reset) | Write | ||
| AV | 57 | network_ReHeatBurnerReset | Reheat burner reset (toggle to reset) | Write | ||
| AV | 58 | network_LowTempSetPoint | Low Temp Alarm Set Point | °F | Write | |
| AV | 59 | network_LowTempDelayTime | Low temperature alarm delay | min | Write | |
| AV | 60 | network_MinimumDischargeTemp | Minimum Discharge Temperature | °F | Write | |
| AV | 61 | network_MaximumDischargeTemp | Maximum Discharge Temperature | °F | Write | |
| AV | 62 | EFF_SpaceTemperature | Current Space Temperature | °F | Read | |
| AV | 63 | EFF_SpaceHumidity | Current Space Humidity | %RH | Read | |
| BV | 21 | ControlType | Space or discharge control | Write | Enumeration (SPACE;DISCHARGE) - see notes | |
| BVmin | 22 | network_FanCommand | Unit on/off command | Write | 0=Off, 1=On | |
| MV | 1 | DirtyPreFitlerAlarm | Dirty pre-filter alarm | Read | Enumeration: Filters | |
| MVmin | 2 | LowTempAlarm | Low Temp Alarm | Read | Enumeration: Alarm / Normal | |
| MV | 5 | OutsideTempSensorAlarm | Outside Temp Sensor Alarm | Read | Enumeration: SensorReliability | |
| MV | 6 | OutsideHumiditySensorAlarm | Outside Humidity Sensor Alarm | Read | Enumeration: SensorReliability | |
| MVmin | 7 | PreheatBurnerLockoutAlarm | Preheat burner lockout alarm | Read | Enumeration: Alarm / Normal | |
| MVmin | 9 | MotorNotRespondingAlarm | Fan motor not responding alarm | Read | Enumeration: Alarm / Normal | |
| MV | 21 | DirtyFinalFilterAlarm | Dirty final filter alarm | Read | Enumeration: Filters | |
| MV | 22 | CoilExitTempSensorAlarm | Coil Exit Sensor Alarm | Read | Enumeration: SensorReliability | |
| MV | 23 | PreheatTempSensorAlarm | Preheat Sensor Alarm | Read | Enumeration: SensorReliability | |
| MV | 24 | DischargeTempSensorAlarm | Discharge Temp Sensor Alarm | Read | Enumeration: SensorReliability | |
| MV | 25 | ReturnTempSensorAlarm | Return temperature sensor alarm | Read | Enumeration: SensorReliability | |
| MV | 26 | DischargeHumiditySensorAlarm | Discharge Humidity Sensor Alarm | Read | Enumeration: SensorReliability | |
| MV | 27 | ReturnHumiditySensorAlarm | Return humidity sensor alarm | Read | Enumeration: SensorReliability | |
| MV | 28 | ReheatBurnerLockoutAlarm | Reheat burner lockout alarm | Read | Enumeration: Lockout / Normal |
No points match these filters.
Object ID lookup: AbsolutAire PC-3 / LC-3 psychrometric control system point IDs by name
AV36OutsideTemperatureAV37OutsideHumidityAV38CoilExitTemperatureAV39PreheatExitTemperatureAV40DischargeTemperatureAV41DischargeHumidityAV42DischargeAirflowCFMAV43CoolingCommandAV44PreheatCommandAV45HumiditficationCommandAV46ReheatCommandAV47ControlHysteresisAV48BuildingPressureSetPointAV49BuildingPressureSensorAV50network_MinimumEconomizer_VFDAV51network_MazimumEconomizer_VFDAV52network_TempSetPointAV53network_HumiditySetPointAV54network_CFM_SetPointAV55network_VFD_Econ_SetPointAV56network_PreHeatBurnerResetAV57network_ReHeatBurnerResetAV58network_LowTempSetPointAV59network_LowTempDelayTimeAV60network_MinimumDischargeTempAV61network_MaximumDischargeTempAV62EFF_SpaceTemperatureAV63EFF_SpaceHumidityBV21ControlTypeBV22network_FanCommandMV1DirtyPreFitlerAlarmMV2LowTempAlarmMV5OutsideTempSensorAlarmMV6OutsideHumiditySensorAlarmMV7PreheatBurnerLockoutAlarmMV9MotorNotRespondingAlarmMV21DirtyFinalFilterAlarmMV22CoilExitTempSensorAlarmMV23PreheatTempSensorAlarmMV24DischargeTempSensorAlarmMV25ReturnTempSensorAlarmMV26DischargeHumiditySensorAlarmMV27ReturnHumiditySensorAlarmMV28ReheatBurnerLockoutAlarm
Integration notes
- The guide prints 'degrees-Fahrenheit' as the unit for humidity, airflow and command-percent points; those units are corrected here (%RH, CFM, %).
- MV 25 and MV 27 repeat the descriptions of MV 24 and MV 26 in the guide; by name they are the return temperature and return humidity sensor alarms.
- Multistate alarm objects use AbsolutAire enumerations named in the guide (Filters, Alarm / Normal, Lockout / Normal, SensorReliability) without listing the state numbers.
- The ControlType BV is printed as Boolean (SPACE;DISCHARGE) without saying which state is 1.
- Names are kept as printed, including typos (HumiditficationCommand, network_MazimumEconomizer_VFD, DirtyPreFitlerAlarm).
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 PC-3 / LC-3 psychrometric 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 PC-3 / LC-3 psychrometric control system
How many BACnet points does the AbsolutAire PC-3 / LC-3 psychrometric control system have?
This list has 44 BACnet objects: 28 analog values, 2 binary values, 14 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which AbsolutAire PC-3 / LC-3 psychrometric control system BACnet points are writable?
16 of the 44 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 PC-3 / LC-3 psychrometric control system BACnet documentation?
The source is PC-3 User Guide - Network Integration (PC-3 User Guide 010220), published free by AbsolutAire at https://www.absolutaire.com/wp-content/uploads/pc_3_users_guide.pdf.
What are the minimum BACnet points to integrate the AbsolutAire PC-3 / LC-3 psychrometric control system?
Start with BV 22 network_FanCommand (Unit on/off command); AV 52 network_TempSetPoint (Discharge temperature setpoint, °F); AV 53 network_HumiditySetPoint (Discharge humidity setpoint, %RH); AV 54 network_CFM_SetPoint (Discharge airflow setpoint, CFM (airflow option)); AV 40 DischargeTemperature (Discharge air temperature); AV 41 DischargeHumidity (Discharge air humidity); AV 36 OutsideTemperature (Outside air temperature); MV 9 MotorNotRespondingAlarm (Fan did not start within 2 min of a run command); MV 7 PreheatBurnerLockoutAlarm (Preheat burner lockout); MV 2 LowTempAlarm (Low temperature alarm).
How do I enable BMS control of the AbsolutAire PC-3 / LC-3 psychrometric control system?
network_FanCommand (BV 22) turns the unit on and off from the BMS.
How do I check these points on the real PC-3 / LC-3 psychrometric 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
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Source: PC-3 User Guide - Network Integration · PC-3 User Guide 010220. Object names, instances and units are reproduced as published; descriptions are our own.