Easy BACnet- Home
- BACnet points lists
- AbsolutAire
- ER-3 control system (energy recovery)
Energy recovery make-up air unit controller · BACnet points list
AbsolutAire ER-3 control system (energy recovery) BACnet points list
Updated 6 November 2026
The ER-3 controls AbsolutAire make-up air units with heat recovery, supply and exhaust fans, burner and optional cooling. It joins a BACnet MS/TP network with a device instance built from its DIP-switch MAC address. The BMS writes the fan command, HVAC mode, occupancy, setpoints and fan speed or space temperature overrides, and reads temperatures, humidity, heat recovery effectiveness and energy, fan and heat status and many alarm objects.
This page lists 88 BACnet objects for the AbsolutAire ER-3 control system (energy recovery) — 21 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
- ER-3 control system (energy recovery)
- Equipment
- Energy recovery make-up air unit controller
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 88 (21 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
- ER-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 ER-3 control system (energy recovery)
Write network Fan Command (MV 21) to enable/disable the unit, network Occupancy Command (MV 23) and network HVAC Mode (MV 22), plus the heat/cool setpoints (AV 36-39). Writing 255 to the fan speed or space temperature overrides (AV 47-49) returns them to automatic control. Read discharge temperature, fan and heat status 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 |
|---|---|---|---|
| MV 21 | network Fan Command | Fan command; enables or disables the unit | Write |
| MV 23 | network Occupancy Command | Occupied, Unoccupied or Follow Schedule | Write |
| MV 22 | network HVAC Mode | HVAC mode: Vent, Heat or Cool | Write |
| AV 36 | network Occupied Heat | Occupied heat setpoint | Write |
| AV 38 | network Occupied Cool | Occupied cool setpoint | Write |
| BV 24 | network Burner Reset | Burner lockout reset (pulse 3 s) | Write |
| BV 25 | Supply Fan Status | Supply fan running | Read |
| AV 50 | Discharge Temperature | Discharge air temperature | Read |
| MV 41 | Burner Lockout Alarm | Burner lockout alarm | Read |
| MV 26 | Supply Fan Not Responding Alarm | Supply fan failed to start | Read |
Enable & remote start
MV 21 network Fan Command is the point the guide says to use to enable or disable the unit.
Sensors & values from the BMS
AV 49 network Space Temperature overrides the local space temperature (255 = local). AV 57 shows the local value and AV 66 the value used for control. AV 47/48 override supply and exhaust fan speed (255 = automatic).
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 outputs from the BMS: each override raises a Hardware Output n Override alarm (MV 42-53).
- MV 33 Low Temperature Alarm is reset by commanding the unit off then on.
- BV 24 Burner Reset must be pulsed to Reset for about 3 seconds, then returned to Normal.
AbsolutAire ER-3 control system (energy recovery) 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 | Config Condenser Low Scale | Unit configuration variable, do not write | °F | Read | |
| AV | 2 | Config Condenser High Scale | Unit configuration variable, do not write | °F | Read | |
| AV | 3 | Config Stage Delay Minutes | Unit configuration variable, do not write | min | Read | |
| AV | 4 | Config Supply CFM | Unit configuration variable, do not write | cfm | Read | |
| AV | 5 | Config Exhaust CFM | Unit configuration variable, do not write | cfm | Read | |
| AV | 6 | Config Design Temp Rise | Unit configuration variable, do not write | °F | Read | |
| AVmin | 36 | network Occupied Heat | Occupied heat setpoint | °F | Write | |
| AV | 37 | network Unoccupied Heat | Unoccupied heat setpoint | °F | Write | |
| AVmin | 38 | network Occupied Cool | Occupied cool setpoint | °F | Write | |
| AV | 39 | network Unoccupied Cool | Unoccupied cool setpoint | °F | Write | |
| AV | 40 | network Minimum Discharge | Minimum discharge temperature | °F | Write | |
| AV | 41 | network Maximum Discharge | Maximum discharge temperature | °F | Write | |
| AV | 42 | network Building Pressure Set Pt | Building pressure setpoint | inH2O | Write | |
| AV | 43 | network Heat Lockout Set Point | Heat lockout setpoint | °F | Write | |
| AV | 44 | network Cool Lockout Set Point | Cool lockout setpoint | °F | Write | |
| AV | 45 | network Low Temp Set Pt | Low temperature alarm setpoint | °F | Write | |
| AV | 46 | network Low Temp Delay | Low temperature alarm delay | min | Write | |
| AV | 47 | network Supply Fan Speed | Supply fan speed override 0-100 %, 255 = auto | % | Write | |
| AV | 48 | network Exhaust Fan Speed | Exhaust fan speed override 0-100 %, 255 = auto | % | Write | |
| AV | 49 | network Space Temperature | Network space temperature; 255 = use local | °F | Write | |
| AVmin | 50 | Discharge Temperature | Current discharge air temperature | °F | Read | |
| AV | 51 | Exhaust Temperature | Current exhaust air temperature | °F | Read | |
| AV | 52 | Outside Temperature | Current outside temperature | °F | Read | |
| AV | 53 | Outside Humidity | Current outside humidity | %RH | Read | |
| AV | 54 | Return Temperature | Current return air temperature | °F | Read | |
| AV | 55 | Return Humidity | Current return humidity | %RH | Read | |
| AV | 56 | Heat Recovery Supply Temperature | Air temperature leaving the heat recovery section | °F | Read | |
| AV | 57 | Local Space Temperature | Local space temperature, without network override | °F | Read | |
| AV | 58 | Cooling Coil Exit Temperature | Cooling coil leaving air temperature | °F | Read | |
| AV | 59 | Building Pressure | Current building pressure | inH2O | Read | |
| AV | 60 | Heat Command | Current heat command | % | Read | |
| AV | 61 | Energy Recovery Command | Heat recovery face/bypass damper command | % | Read | |
| AV | 62 | Energy Recovery Effectiveness | Current heat recovery effectiveness | % | Read | |
| AV | 63 | Energy Recovered | Energy recovered | Btu/h | Read | |
| AV | 64 | Active Cooling Stages | Number of active cooling stages | Read | ||
| AV | 65 | Cooling Command | Current cooling command | % | Read | |
| AV | 66 | Control Space Temperature | Space temperature used for control, incl. network override | °F | Read | |
| BV | 1 | Config Schedule Available | Unit configuration variable, do not write | Read | Active=YES, Inactive=NO | |
| BV | 2 | Config OA DFS Available | Unit configuration variable, do not write | Read | Active=YES, Inactive=NO | |
| BV | 3 | Config RA DFS Available | Unit configuration variable, do not write | Read | Active=YES, Inactive=NO | |
| BV | 4 | Config Space Sensor Type | Unit configuration variable, do not write | Read | Active=REMOTE WIRED, Inactive=WITHIN HMI | |
| BV | 5 | Config Cooling Coil Sensor Used | Unit configuration variable, do not write | Read | Active=YES, Inactive=NO | |
| BV | 6 | Config LTL Available | Unit configuration variable, do not write | Read | Active=YES, Inactive=NO | |
| BV | 7 | Config Stage Timer Used | Unit configuration variable, do not write | Read | Active=YES, Inactive=NO | |
| BV | 8 | Config MWS Available | Unit configuration variable, do not write | Read | Active=YES, Inactive=NO | |
| BV | 21 | network Cycle Occupied | Cycle unit on space temperature when occupied | Write | Active=YES, Inactive=NO | |
| BV | 22 | network Cycle Unoccupied | Cycle unit on space temperature when unoccupied | Write | Active=YES, Inactive=NO | |
| BV | 23 | network Control Type | Unit control type | Write | Active=SPACE, Inactive=DISCHARGE | |
| BVmin | 24 | network Burner Reset | Burner reset; pulse Reset for 3 s to clear a lockout | Write | Active=RESET, Inactive=NORMAL | |
| BVmin | 25 | Supply Fan Status | Current supply fan status | Read | Active=ON, Inactive=OFF | |
| BV | 26 | Exhaust Fan Status | Current exhaust fan status | Read | Active=ON, Inactive=OFF | |
| BV | 27 | Heat Status | Current heat status | Read | Active=ON, Inactive=OFF | |
| MV | 1 | Config Building Pressure Control | Unit configuration variable, do not write (enum Building Pressure Control) | Read | ||
| MV | 2 | Config Heating Type | Unit configuration variable, do not write (enum Heating Type) | Read | ||
| MV | 3 | Config Cooling Type | Unit configuration variable, do not write (enum Cooling Type) | Read | ||
| MVmin | 21 | network Fan Command | Fan command; enables/disables the unit (enum Fan Command) | Write | ||
| MVmin | 22 | network HVAC Mode | HVAC mode: Vent, Heat or Cool | Write | ||
| MVmin | 23 | network Occupancy Command | Occupancy: Occupied, Unoccupied or Follow Schedule | Write | ||
| MV | 24 | Burner Not Responding Allram | Burner failed to light without a lockout alarm | Read | ALARM / NORMAL | |
| MV | 25 | Burner Watchdog Alarm | Discharge temperature not reached; check valves or gas | Read | ALARM / NORMAL | |
| MVmin | 26 | Supply Fan Not Responding Alarm | Supply fan failed to report on | Read | ALARM / NORMAL | |
| MV | 27 | Exhaust Fan Not Responding Alarm | Exhaust fan failed to report on | Read | ALARM / NORMAL | |
| MV | 28 | OA Dirty Filter Alarm | Outside air dirty filter alarm | Read | ALARM / NORMAL | |
| MV | 29 | RA Dirty Filter Alarm | Return air dirty filter alarm | Read | ALARM / NORMAL | |
| MV | 30 | Space Temperature Sensor Alarm | Space temperature sensor alarm (enum Reliability) | Read | ||
| MV | 31 | Cooling Coil Temp Sensor Alarm | Cooling coil temperature sensor alarm (enum Reliability) | Read | ||
| MV | 32 | Building Pressure Sensor Alarm | Building pressure sensor alarm (enum Reliability) | Read | ||
| MV | 33 | Low Temperature Alarm | Low discharge temperature; cycle unit off/on to reset | Read | ALARM / NORMAL | |
| MV | 34 | Discharge Temp Sensor Alarm | Discharge temperature sensor alarm (enum Reliability) | Read | ||
| MV | 35 | Exhaust Temp Sensor Alarm | Exhaust temperature sensor alarm (enum Reliability) | Read | ||
| MV | 36 | Outside Temp Sensor Alarm | Outside temperature sensor alarm (enum Reliability) | Read | ||
| MV | 37 | Outside Humidity Sensor Alarm | Outside humidity sensor alarm (enum Reliability) | Read | ||
| MV | 38 | Return Temp Sensor Alarm | Return temperature sensor alarm (enum Reliability) | Read | ||
| MV | 39 | Return Humidity Sensor Alarm | Return humidity sensor alarm (enum Reliability) | Read | ||
| MV | 40 | Heat Recovery Temp Sensor Alarm | Heat recovery exit sensor alarm (enum Reliability) | Read | ||
| MVmin | 41 | Burner Lockout Alarm | Burner lockout alarm | Read | ALARM / NORMAL | |
| MV | 42 | Hardware Output 1 Override | Hardware output 1 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 43 | Hardware Output 2 Override | Hardware output 2 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 44 | Hardware Output 3 Override | Hardware output 3 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 45 | Hardware Output 4 Override | Hardware output 4 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 46 | Hardware Output 5 Override | Hardware output 5 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 47 | Hardware Output 6 Override | Hardware output 6 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 48 | Hardware Output 7 Override | Hardware output 7 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 49 | Hardware Output 8 Override | Hardware output 8 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 50 | Hardware Output 9 Override | Hardware output 9 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 51 | Hardware Output 10 Override | Hardware output 10 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 52 | Hardware Output 11 Override | Hardware output 11 overridden from the network; remove override | Read | ALARM / NORMAL | |
| MV | 53 | Hardware Output 12 Override | Hardware output 12 overridden from the network; remove override | Read | ALARM / NORMAL |
No points match these filters.
Object ID lookup: AbsolutAire ER-3 control system point IDs by name
AV1Config Condenser Low ScaleAV2Config Condenser High ScaleAV3Config Stage Delay MinutesAV4Config Supply CFMAV5Config Exhaust CFMAV6Config Design Temp RiseAV36network Occupied HeatAV37network Unoccupied HeatAV38network Occupied CoolAV39network Unoccupied CoolAV40network Minimum DischargeAV41network Maximum DischargeAV42network Building Pressure Set PtAV43network Heat Lockout Set PointAV44network Cool Lockout Set PointAV45network Low Temp Set PtAV46network Low Temp DelayAV47network Supply Fan SpeedAV48network Exhaust Fan SpeedAV49network Space TemperatureAV50Discharge TemperatureAV51Exhaust TemperatureAV52Outside TemperatureAV53Outside HumidityAV54Return TemperatureAV55Return HumidityAV56Heat Recovery Supply TemperatureAV57Local Space TemperatureAV58Cooling Coil Exit TemperatureAV59Building PressureAV60Heat CommandAV61Energy Recovery CommandAV62Energy Recovery EffectivenessAV63Energy RecoveredAV64Active Cooling StagesAV65Cooling CommandAV66Control Space TemperatureBV1Config Schedule AvailableBV2Config OA DFS AvailableBV3Config RA DFS AvailableBV4Config Space Sensor TypeBV5Config Cooling Coil Sensor UsedBV6Config LTL AvailableBV7Config Stage Timer UsedBV8Config MWS AvailableBV21network Cycle OccupiedBV22network Cycle UnoccupiedBV23network Control TypeBV24network Burner ResetBV25Supply Fan StatusBV26Exhaust Fan StatusBV27Heat StatusMV1Config Building Pressure ControlMV2Config Heating TypeMV3Config Cooling TypeMV21network Fan CommandMV22network HVAC ModeMV23network Occupancy CommandMV24Burner Not Responding AllramMV25Burner Watchdog AlarmMV26Supply Fan Not Responding AlarmMV27Exhaust Fan Not Responding AlarmMV28OA Dirty Filter AlarmMV29RA Dirty Filter AlarmMV30Space Temperature Sensor AlarmMV31Cooling Coil Temp Sensor AlarmMV32Building Pressure Sensor AlarmMV33Low Temperature AlarmMV34Discharge Temp Sensor AlarmMV35Exhaust Temp Sensor AlarmMV36Outside Temp Sensor AlarmMV37Outside Humidity Sensor AlarmMV38Return Temp Sensor AlarmMV39Return Humidity Sensor AlarmMV40Heat Recovery Temp Sensor AlarmMV41Burner Lockout AlarmMV42Hardware Output 1 OverrideMV43Hardware Output 2 OverrideMV44Hardware Output 3 OverrideMV45Hardware Output 4 OverrideMV46Hardware Output 5 OverrideMV47Hardware Output 6 OverrideMV48Hardware Output 7 OverrideMV49Hardware Output 8 OverrideMV50Hardware Output 9 OverrideMV51Hardware Output 10 OverrideMV52Hardware Output 11 OverrideMV53Hardware Output 12 Override
Integration notes
- Taken from the Network Points List (pp16-17) of the ER-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' (28 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.
- Object names are kept as printed, including typos such as "Burner Not Responding Allram".
- Multistate state texts are given in the guide only as enumeration names (Fan Command, HVAC Mode, Occupancy, Reliability); read State_Text on the device for the numbering.
- AV 1-6, BV 1-8 and MV 1-3 are unit configuration variables; the guide says not to write them.
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 ER-3 control system (energy recovery) 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 ER-3 control system (energy recovery)
How many BACnet points does the AbsolutAire ER-3 control system (energy recovery) have?
This list has 88 BACnet objects: 37 analog values, 15 binary values, 36 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which AbsolutAire ER-3 control system (energy recovery) BACnet points are writable?
21 of the 88 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 ER-3 control system (energy recovery) BACnet documentation?
The source is ER-3 User Guide - Network Integration / Network Points List (ER-3 User Guide 121621), published free by AbsolutAire at https://www.absolutaire.com/wp-content/uploads/er-3_user_guide.pdf.
What are the minimum BACnet points to integrate the AbsolutAire ER-3 control system (energy recovery)?
Start with MV 21 network Fan Command (Fan command; enables or disables the unit); MV 23 network Occupancy Command (Occupied, Unoccupied or Follow Schedule); MV 22 network HVAC Mode (HVAC mode: Vent, Heat or Cool); AV 36 network Occupied Heat (Occupied heat setpoint); AV 38 network Occupied Cool (Occupied cool setpoint); BV 24 network Burner Reset (Burner lockout reset (pulse 3 s)); BV 25 Supply Fan Status (Supply fan running); AV 50 Discharge Temperature (Discharge air temperature); MV 41 Burner Lockout Alarm (Burner lockout alarm); MV 26 Supply Fan Not Responding Alarm (Supply fan failed to start).
How do I enable BMS control of the AbsolutAire ER-3 control system (energy recovery)?
MV 21 network Fan Command is the point the guide says to use to enable or disable the unit.
Can the BMS supply sensor values to the AbsolutAire ER-3 control system (energy recovery)?
AV 49 network Space Temperature overrides the local space temperature (255 = local). AV 57 shows the local value and AV 66 the value used for control. AV 47/48 override supply and exhaust fan speed (255 = automatic).
How do I check these points on the real ER-3 control system (energy recovery)?
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
- 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 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: ER-3 User Guide - Network Integration / Network Points List · ER-3 User Guide 121621. Object names, instances and units are reproduced as published; descriptions are our own.