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CORE Unit Controller

Rooftop unit controller · BACnet points list

Lennox CORE Unit Controller BACnet points list

Updated 28 October 2026

Short answer

The CORE Unit Controller has BACnet IP (two RJ-45 ports with a built-in switch) and BACnet MS/TP on board, so no add-on card is needed. The BAS writes occupancy, setpoints and network sensor values to Analog Outputs and Analog Values and reads status from Analog Inputs, a few character-string values and multistate values. Commands are not stored through a reset and must be rewritten regularly, or the unit treats the network as offline.

This page lists 99 BACnet objects for the Lennox CORE Unit Controller — 38 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Lennox’s own free documentation, linked below.

Manufacturer: Lennox
Model: CORE Unit Controller
Equipment: Rooftop unit controller
Equipment type: Rooftop units, AHUs & DOAS
BACnet objects: 99 (38 writable)
Transport: BACnet IP, BACnet MS/TP
Firmware: Not stated
Default device instance: 2 on MS/TP; last octet of the IP address on BACnet IP
Also known as: Lennox CORE, CORE controller, CORE RTU controller, M4 unit controller, A55, Lennox_CORE, 508112
Source document: Lennox CORE Unit Controller BACnet Setup Guide · 508112-02 · rev. 05/2026

Download CSV 99 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Lennox’s current documentation and the live device before use. Not official Lennox information. Terms of use.

BMS integration notes: Lennox CORE Unit Controller

Integration in brief

Run the Network Setup Wizard in the CORE service app (RTU MENU > NETWORK INTEGRATION), pick BACnet MS/TP or BACnet IP and choose Room Sensor control mode, which is the mode Lennox recommends for BACnet. The BAS then writes occupancy on AO104, setpoints on AV130-133 (or AO109 + AO110), and space temperature, RH and CO2 on AO113, AO112 and AO111 when those sources are set to Network. Multi-zone VAV units also take discharge air setpoints on AO125/AO126 and duct static on AO123.

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
AO 104	Occupancy Scheduler Control	0 = occupied, 1-255 = unoccupied; rewrite every 2 min	Command
AO 101	Application Mode Control	Mode command (0 = auto, 6 = off)	Command
AV 130	Heating Occupied Setpoint	Occupied heating setpoint, 40-95 °F	Write
AV 131	Cooling Occupied Setpoint	Occupied cooling setpoint, 40-95 °F	Write
AV 132	Heating Unoccupied Setpoint	Unoccupied heating setpoint, 40-95 °F	Write
AV 133	Cooling Unoccupied Setpoint	Unoccupied cooling setpoint, 40-95 °F	Write
AO 113	Space Temperature Input	Network space temperature; rewrite every 2 min	Command
AI 232	Unit Status	HVAC state code: 0 idle, 1 heat, 3 cool, 6 off, 9 fan	Read
AI 239	Space Temperature	Space temperature in use	Read
CSV 302	Alarm Log	Alarm codes, comma-separated; replaces AI 253	Read

Enable & remote start

No BACnet enable point. In the service app, Network Setup Wizard, set the Control Mode: Monitor Only ignores network setpoints and mode demands, Room Sensor uses AO104 occupancy plus AV130-133 or AO109 setpoints, and Network Thermostat takes heat/cool demands on AO101 (values 224-236; Lennox does not recommend it). AO101 = 6 (Off) disables the whole unit.

Heartbeat & communication loss

The controller must receive a write at least every 15 minutes or it treats the network as offline. Network space temperature (AO113), RH, CO2, thermostat demands (AO101), occupancy (AO104) and setpoints (AO109, AV130-133) must be rewritten at least every 5 minutes if used; Lennox recommends every 2 minutes. In Network Thermostat mode, no AO101 data for 5 minutes puts the unit in its backup mode, and it resets when data returns.

Sensors & values from the BMS

Space temperature goes to AO113, space RH to AO112 and CO2 to AO111, with the matching sensor source set to Network in the wizard. After start-up the unit waits 5 minutes for AO113 and stays in a no-run mode meanwhile; after that it uses a local sensor if one is wired, otherwise logs a sensor failure and enters backup mode (code 93). Outdoor air temperature has no network input.

Network setup

Default device instance is 2 (or the S-Bus address) on MS/TP and the last octet of the IP address on BACnet IP; it can also be written to AO105.
BACnet IP uses UDP port 47808, which cannot be changed; use a BBMD to reach other subnets.
MS/TP baud 9.6k, 19.2k, 38.4k or 76.8k; default 38.4k. Max_Master defaults to 127 and Max_Info_Frames to 1.
Use consecutive MAC addresses starting at 1, and set Max_Master to the highest MAC on the trunk.
Lennox recommends no repeaters and, above 9.6k baud, no more than 20 Lennox units and 30 devices per router.
Default device name is Lennox_CORE_2.

Watch out for

Commands are not stored: rewrite all control points after every controller reset.
AO108, AO123 and AO124 cannot be returned to the local setpoint once written, except by a controller reset.
AV130-133 are rejected as out of range if a heating setpoint is not below its cooling setpoint by the changeover deadband (Parameter 152, default 3 °F).
AO129 economizer control only works with the economizer in temperature mode (Configuration ID 1, position 2 = T).
Use ReadPropertyMultiple when reading many analog objects.

Lennox CORE Unit Controller 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.

99 of 99 shown

Type

Multi-stateOther

Access

Units

Show

Lennox CORE Unit Controller BACnet Points List
			Description			States
AOmin	101	Application Mode Control	Unit mode, fan, exhaust and reset command (coded)		Command	0=Auto; 1=Heat; 3=Cool; 6=Off; 9=Fan only; 255=Null (Auto); 208=Fan auto; 209=Fan on; 216=Exhaust auto; 217=Exhaust 1 on; 218=Exhaust 1 off; 219=Exhaust 2 on; 220=Exhaust 2 off; 221=Exhaust on; 222=Exhaust off; 254=Reset; 224=Idle; 225=Heat 1; 226=Heat 2; 227=Heat 3; 228=Cool 1; 229=Reheat lo; 230=Reheat hi; 232=Cool 2; 233=Dehum; 234=Dehum + cool; 236=Cool 3 (224-236 remote thermostat mode only)
AO	102	Outdoor Air Min Pos Control	Economizer minimum damper position; 101-255 = local	%	Command
AO	103	Occupancy Override Control	Manual occupancy override		Command	0=Occupied; 1=Unoccupied; 2=Refresh override timer; 3-255=Auto (back to schedule)
AOmin	104	Occupancy Scheduler Control	Scheduled occupancy from the BAS		Command	0=Occupied; 1-255=Unoccupied
AO	105	BACnet Device Instance	Device instance, 1-4194302		Command
AO	107	Occupancy Sensor Input	Occupancy sensor state from the BAS		Command	0=Occupied; 1=Unoccupied; 2-255=Auto (back to schedule)
AO	108	Space Dehumidification Setpoint	Space RH setpoint for dehumidification	%	Command
AO	109	Temperature Setpoint (abs)	Single space setpoint, 36.25-100 °F	°F	Command
AO	110	Temperature Setpoint Offset	Offset added to the single setpoint, -32 to 31.75	°F	Command
AO	111	IAQ 1 Network Input	Space CO2 from the BAS, 300-2000	ppm	Command
AO	112	Humidity Network Input	Space RH from the BAS	%	Command
AOmin	113	Space Temperature Input	Space temperature from the BAS	°F	Command
AO	114	Emergency Override Control	Smoke/emergency mode command		Command	0=Normal; 1=Pressurize; 2=Depressurize (speed); 3=Purge (speed); 4=Shutdown; 5=Fire; 6=Depressurize (pressure); 7=Purge (pressure); >7=Normal
AO	115	Compressor Enable Control	Compressor stage enable / capacity limit	%	Command	0=Disabled; 1-100=Limited to % of maximum; 101-255=Full output allowed
AO	117	Primary Heat Enable Control	Primary heat stage enable / capacity limit	%	Command	0=Disabled; 1-100=Limited to % of maximum; 101-255=Full output allowed
AO	119	Auxiliary Heat Enable Control	Auxiliary heat stage enable / capacity limit	%	Command	0=Disabled; 1-100=Limited to % of maximum; 101-255=Full output allowed
AO	123	Duct Static Setpoint	Duct static pressure setpoint, 0-5 inWC	inWC	Command
AO	124	Building Static Setpoint	Building static setpoint for power exhaust, -0.5 to 0.5	inWC	Command
AO	125	Discharge Air Cooling Setpoint	Discharge air cooling setpoint, 40-100; -9 = local	°F	Command
AO	126	Discharge Air Heating Setpoint	Discharge air heating setpoint, 60-140; -9 = local	°F	Command
AO	127	Supply Fan Capacity Input	Supply fan speed, 33-100 %; 101-255 = local	%	Command
AO	128	Exhaust Fan Capacity Input	Exhaust fan speed, 33-100 %; 255 = local	%	Command
AO	129	Set Economizer Outdoor Air Suitable	Outdoor air suitable for free cooling		Command	0=Economizer disabled; 1=Economizer enabled; >1=Auto
AI	198	Mac Address	BACnet MS/TP MAC address, 0-127		Read
AI	199	IMC Address	L Connection address, 1-31		Read
AI	200	IMC Version[4]	Firmware version character (ASCII code), legacy		Read
AI	201	IMC Version[5]	Firmware version character (ASCII code), legacy		Read
AI	202	IMC Version[6]	Firmware version character (ASCII code), legacy		Read
AI	203	IMC Version[7]	Firmware version character (ASCII code), legacy		Read
AI	204	IMC Version[8]	Firmware version character (ASCII code), legacy		Read
AI	205	IMC Version[9]	Firmware version character (ASCII code), legacy		Read
AI	206	IMC Version[10]	Firmware version character (ASCII code), legacy		Read
AI	207	IMC Version[11]	Firmware version character (ASCII code), legacy		Read
AI	208	IMC Version[12]	Firmware version character (ASCII code), legacy		Read
AI	209	IMC Version[13]	Firmware version character (ASCII code), legacy		Read
AI	210	IMC Version[14]	Firmware version character (ASCII code), legacy		Read
AI	231	Unit ID	Unit type code		Read	48-63=Gas heat, electric cool; 64-79=Electric heat, electric cool; 80-95=Heat pump
AImin	232	Unit Status	HVAC operating state (coded)		Read	0=Idle; 1=Heat; 2=Morning warm-up; 3=Cool; 5=Pre-cool; 6=Off; 7=Test; 8=Emergency heat; 9=Fan only; 12=Max heat; 14=Dehumidification; 129=Fresh air heating; 131=Fresh air cooling; 145=Defrost comp 1; 161=Defrost comp 2; 177=Defrost comp 1 & 2
AImin	239	Space Temperature	Space temperature in use (local or network)	°F	Read
AI	240	Discharge Air Temperature	Discharge air temperature	°F	Read
AI	241	Effective Occupancy	Occupancy state in use		Read	0=Occupied; 1=Unoccupied; 2=Occupied (timed override)
AI	242	Local Outside Air Temperature	Outdoor air temperature from the unit sensor	°F	Read
AI	243	Local Space Temperature	Space temperature from the wired sensor	°F	Read
AI	244	Outside Air Damper	Outdoor air damper position; 255 = no damper	%	Read
AI	245	Heat Primary	Primary heating capacity running	%	Read
AI	246	Heat Secondary	Auxiliary (strip) heating capacity running	%	Read
AI	247	Cool Primary	Compressor cooling capacity running	%	Read
AI	248	Economizer Enabled	Outdoor air suitable for free cooling		Read	0=Disabled; 1=Enabled; 255=No economizer
AI	250	Supply Fan Status	Supply fan state or speed	%	Read	0=Off; 1=On (single speed); 2-100=Speed %
AI	252	Space Temperature Setpoint (Eff)	Space setpoint in use	°F	Read
AI	253	Current Error	Active alarm code, 0 = none (legacy; use CSV 302)		Read
AI	254	Error Pointer	Number of active alarms (legacy)		Read
AI	255	Most recent Error 1	Alarm history entry 1, 1 = newest (legacy)		Read
AI	256	Most recent Error 2	Alarm history entry 2, 1 = newest (legacy)		Read
AI	257	Most recent Error 3	Alarm history entry 3, 1 = newest (legacy)		Read
AI	258	Most recent Error 4	Alarm history entry 4, 1 = newest (legacy)		Read
AI	259	Most recent Error 5	Alarm history entry 5, 1 = newest (legacy)		Read
AI	260	Most recent Error 6	Alarm history entry 6, 1 = newest (legacy)		Read
AI	261	Most recent Error 7	Alarm history entry 7, 1 = newest (legacy)		Read
AI	262	Most recent Error 8	Alarm history entry 8, 1 = newest (legacy)		Read
AI	263	Most recent Error 9	Alarm history entry 9, 1 = newest (legacy)		Read
AI	264	Most recent Error 10	Alarm history entry 10, 1 = newest (legacy)		Read
AI	273	IAQ 2 Effective Value	IAQ 2 input measured at the controller	V	Read
AI	274	Space CO2 Sensor (Eff)	Space CO2 in use (local or network)	ppm	Read	0-6=No sensor; 7-1992=Valid; 1993-2000=Sensor error
AI	275	Space CO2 Sensor (Local)	Space CO2 from the wired sensor	ppm	Read	0-6=No sensor; 7-1992=Valid; 1993-2000=Sensor error
AI	276	Space Humidity (Eff)	Space RH in use (local or network)	%	Read	0=No sensor; 1-99=Valid; 100=Sensor error
AI	277	Space Humidity (Local)	Space RH from the wired sensor	%	Read	0=No sensor; 1-99=Valid; 100=Sensor error
AI	278	Dehumidification Setpoint (Eff)	Dehumidification RH setpoint in use	%	Read
AI	279	Dehumidification Status	Dehumidification state		Read	0=Not installed; 1=Installed, not running; 2=Running
AI	281	Return Air Temperature	Return air temperature	°F	Read
AI	282	Building Static Pressure	Building static pressure, -0.5 to 0.5	inWC	Read
AI	283	Duct Static Pressure	Supply duct static pressure, 0-5	inWC	Read
AI	285	Exhaust Fan Status	Exhaust fan state or speed	%	Read	0=Off; 1=Stage 1 on; 2=Stage 2 on; 33-100=Speed %; 255=No exhaust
AI	290	Filter Efficiency	Filter efficiency reading; -1 = no sensor		Read
AI	293	Modulating Compressor Demand	Variable compressor demand, 0-100; -1 = n/a		Read
AV	1	Baud Rate Setting	MS/TP baud rate		Write	9600; 19200; 38400; 76800
AVmin	130	Heating Occupied Setpoint	Occupied heating setpoint, 40-95	°F	Write
AVmin	131	Cooling Occupied Setpoint	Occupied cooling setpoint, 40-95	°F	Write
AVmin	132	Heating Unoccupied Setpoint	Unoccupied heating setpoint, 40-95	°F	Write
AVmin	133	Cooling Unoccupied Setpoint	Unoccupied cooling setpoint, 40-95	°F	Write
AV	142	IAQ Setpoint Start Open	CO2 level where DCV starts opening the damper	ppm	Write
AV	143	IAQ Setpoint Full Open	CO2 level for fully open DCV damper	ppm	Write
AV	144	Free Cooling Temperature Sensible Setpoint	Economizer sensible changeover setpoint, 40-75	°F	Write
AV	145	Free Cooling Temperature Offset Setpoint	Economizer temperature offset setpoint, 0-40	°F	Write
AV	146	Free Cooling Enthalpy Setpoint	Single-enthalpy economizer setpoint, 10-19	mA	Write
AV	147	Free Cooling Enthalpy Offset Setpoint	Dual-enthalpy economizer offset, 1-5	mA	Write
AV	148	After Hours Override Delay Setpoint	After-hours override time, 0-480	min	Write
AV	149	Heat Pump Dual Fuel Balance Point	Below this OAT, switch from compressor to gas heat	°F	Write
AV	150	Heat Pump Compressor Lockout Low Setpoint	Compressor heating locks out below this OAT	°F	Write
AV	151	Heat Pump Compressor Lockout High Setpoint	Compressor heating re-enables above this OAT	°F	Write
CSV	300	Unit Model String	Unit model number		Read
CSV	301	Board Firmware Version	Controller firmware, XX.YY.ZZZZ		Read
CSVmin	302	Alarm Log	Comma-separated alarm codes, newest last		Read
CSV	303	Unit Subcooling	Subcooling per circuit; -9 = not available		Read
CSV	304	Unit Superheat	Superheat per circuit; -9 = not available		Read
CSV	305	Compressor Runtime Hours	Run hours per compressor; -1 = not fitted		Read
MV	310	Mode of Operation	Control mode the unit is running in		Read	1=Wired thermostat; 2=Remote thermostat; 3=Discharge air control; 4=Room sensor; 5=Backup operation
MV	311	Remote Handset Connection	Service handset connected		Read	1=Not connected; 2=Connected
MV	312	RTU Status	HVAC operating state		Read	1=Heat; 2=Morning warm-up; 3=Cool; 5=Pre-cool; 6=Off; 7=Test; 8=Emergency heat; 9=Fan only; 12=Max heat; 14=Dehumidification; 30=Idle; 31=Fresh air heating; 32=Fresh air cooling; 33=Defrost comp 1; 34=Defrost comp 2; 35=Defrost comp 1 & 2

Object ID lookup: Lennox CORE Unit Controller point IDs by name

AO101Application Mode Control
AO102Outdoor Air Min Pos Control
AO103Occupancy Override Control
AO104Occupancy Scheduler Control
AO105BACnet Device Instance
AO107Occupancy Sensor Input
AO108Space Dehumidification Setpoint
AO109Temperature Setpoint (abs)
AO110Temperature Setpoint Offset
AO111IAQ 1 Network Input
AO112Humidity Network Input
AO113Space Temperature Input
AO114Emergency Override Control
AO115Compressor Enable Control
AO117Primary Heat Enable Control
AO119Auxiliary Heat Enable Control
AO123Duct Static Setpoint
AO124Building Static Setpoint
AO125Discharge Air Cooling Setpoint
AO126Discharge Air Heating Setpoint
AO127Supply Fan Capacity Input
AO128Exhaust Fan Capacity Input
AO129Set Economizer Outdoor Air Suitable
AI198Mac Address
AI199IMC Address
AI200IMC Version[4]
AI201IMC Version[5]
AI202IMC Version[6]
AI203IMC Version[7]
AI204IMC Version[8]
AI205IMC Version[9]
AI206IMC Version[10]
AI207IMC Version[11]
AI208IMC Version[12]
AI209IMC Version[13]
AI210IMC Version[14]
AI231Unit ID
AI232Unit Status
AI239Space Temperature
AI240Discharge Air Temperature
AI241Effective Occupancy
AI242Local Outside Air Temperature
AI243Local Space Temperature
AI244Outside Air Damper
AI245Heat Primary
AI246Heat Secondary
AI247Cool Primary
AI248Economizer Enabled
AI250Supply Fan Status
AI252Space Temperature Setpoint (Eff)
AI253Current Error
AI254Error Pointer
AI255Most recent Error 1
AI256Most recent Error 2
AI257Most recent Error 3
AI258Most recent Error 4
AI259Most recent Error 5
AI260Most recent Error 6
AI261Most recent Error 7
AI262Most recent Error 8
AI263Most recent Error 9
AI264Most recent Error 10
AI273IAQ 2 Effective Value
AI274Space CO2 Sensor (Eff)
AI275Space CO2 Sensor (Local)
AI276Space Humidity (Eff)
AI277Space Humidity (Local)
AI278Dehumidification Setpoint (Eff)
AI279Dehumidification Status
AI281Return Air Temperature
AI282Building Static Pressure
AI283Duct Static Pressure
AI285Exhaust Fan Status
AI290Filter Efficiency
AI293Modulating Compressor Demand
AV1Baud Rate Setting
AV130Heating Occupied Setpoint
AV131Cooling Occupied Setpoint
AV132Heating Unoccupied Setpoint
AV133Cooling Unoccupied Setpoint
AV142IAQ Setpoint Start Open
AV143IAQ Setpoint Full Open
AV144Free Cooling Temperature Sensible Setpoint
AV145Free Cooling Temperature Offset Setpoint
AV146Free Cooling Enthalpy Setpoint
AV147Free Cooling Enthalpy Offset Setpoint
AV148After Hours Override Delay Setpoint
AV149Heat Pump Dual Fuel Balance Point
AV150Heat Pump Compressor Lockout Low Setpoint
AV151Heat Pump Compressor Lockout High Setpoint
CSV300Unit Model String
CSV301Board Firmware Version
CSV302Alarm Log
CSV303Unit Subcooling
CSV304Unit Superheat
CSV305Compressor Runtime Hours
MV310Mode of Operation
MV311Remote Handset Connection
MV312RTU Status

Integration notes

AI253-AI264 (Current Error, Error Pointer, Most recent Error 1-10) and AI200-AI210 (IMC Version) are legacy; Lennox says to use CSV302 and the device object's version properties for new jobs.
AO123-AO126 (duct static, building static and discharge air setpoints) only act in the matching unit configuration (CAV bypass or multi-zone VAV, power exhaust with building pressure control, discharge air control).
The guide's object tables list Present_Value as optionally writable for the CSV and MSV objects, but its quick start calls MSV310 and the status objects read-only; they report status, so they are shown read-only here.
The controller also has obsolete Lennox proprietary objects (compressor, blower, heating, economizer, air sensors) with no instance list; they are not included.
The guide contradicts itself on COV: it says COV works from firmware 9.01.0144, and elsewhere that COV is not supported.

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 CORE Unit Controller 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 Lennox CORE Unit Controller

How many BACnet points does the Lennox CORE Unit Controller have?

This list has 99 BACnet objects: 52 analog inputs, 23 analog outputs, 15 analog values, 3 multi-state values, 6 characterstring values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Lennox CORE Unit Controller BACnet points are writable?

38 of the 99 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 Lennox CORE Unit Controller BACnet documentation?

The source is Lennox CORE Unit Controller BACnet Setup Guide (508112-02), revision 05/2026, published free by Lennox at https://www.lennox.com/dA/bfb1627cbc/508112-02e.pdf.

What are the minimum BACnet points to integrate the Lennox CORE Unit Controller?

Start with AO 104 Occupancy Scheduler Control (0 = occupied, 1-255 = unoccupied; rewrite every 2 min); AO 101 Application Mode Control (Mode command (0 = auto, 6 = off)); AV 130 Heating Occupied Setpoint (Occupied heating setpoint, 40-95 °F); AV 131 Cooling Occupied Setpoint (Occupied cooling setpoint, 40-95 °F); AV 132 Heating Unoccupied Setpoint (Unoccupied heating setpoint, 40-95 °F); AV 133 Cooling Unoccupied Setpoint (Unoccupied cooling setpoint, 40-95 °F); AO 113 Space Temperature Input (Network space temperature; rewrite every 2 min); AI 232 Unit Status (HVAC state code: 0 idle, 1 heat, 3 cool, 6 off, 9 fan); AI 239 Space Temperature (Space temperature in use); CSV 302 Alarm Log (Alarm codes, comma-separated; replaces AI 253).

How do I enable BMS control of the Lennox CORE Unit Controller?

Does the Lennox CORE Unit Controller need a BACnet heartbeat or have a communication timeout?

Can the BMS supply sensor values to the Lennox CORE Unit Controller?

How do I check these points on the real CORE Unit Controller?

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 Lennox BACnet points lists

Source: Lennox CORE Unit Controller BACnet Setup Guide · 508112-02 · rev. 05/2026. Object names, instances and units are reproduced as published; descriptions are our own.