Home
BACnet points lists
Lennox
IMC BACnet Module

Rooftop unit controller BACnet module · BACnet points list

Lennox IMC BACnet Module BACnet points list

Updated 4 November 2026

Short answer

The IMC BACnet module mounts on the older Lennox IMC (M1-7) rooftop controller and translates its SysBus data to BACnet MS/TP at a fixed 38.4 kbps. The BMS can act as a zone sensor (setpoint plus space temperature) or as a thermostat (application mode stage commands). It exposes 64 analog and binary objects (two printed ranges are shown as one row each); COV is not supported.

This page lists 48 BACnet objects for the Lennox IMC BACnet Module — 19 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: IMC BACnet Module
Equipment: Rooftop unit controller BACnet module
Equipment type: Rooftop units, AHUs & DOAS
BACnet objects: 48 (19 writable)
Transport: BACnet MS/TP
Firmware: IMC M1-7 v5.02 or later
Also known as: Lennox IMC BACnet, IMC M1-7, M1-7 BACnet, 0624-L5, L Series IMC BACnet
Source document: IMC BACnet Module (Service Literature) · Corp. 0624-L5 · rev. 02/2008

Download CSV 48 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 IMC BACnet Module

Integration in brief

Address each IMC with its DIP switch (1-31), then either send a zone setpoint (AO 109) and space temperature (AO 113) with occupancy, or send thermostat-style commands on Application Mode Control (AO 101). Keep those values refreshed inside 5 minutes. Read Unit Status, Space Temperature and Current Error for monitoring.

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 101	Application Mode Control	Mode: 0 auto, 1 heat, 3 cool, 6 off (more codes)	Write
AO 104	Occupancy Scheduler Control	0 = occupied, 1-255 = unoccupied	Write
AO 109	Temperature Setpoint (abs)	Zone temperature setpoint, °F	Write
AO 113	Space Temperature Input	Zone temp from the BMS in BACnet sensor mode	Write
AI 232	Unit Status	Operating mode: heat, cool, off, fan only and more	Read
AI 241	Effective Occupancy	0 occupied, 1 unoccupied, 2 timed override	Read
AI 239	Space Temperature	Zone temperature in use	Read
AI 240	Discharge Air Temperature	Supply air temperature	Read
AI 250	Supply Fan Status	0 off, 1 on, 2-100 speed %	Read
AI 253	Current Error	Active alarm code; 0 = none	Read

Enable & remote start

The IMC must be set locally (ECTO 6.01 / 5.27) for BACnet thermostat or BACnet zone sensor control. Occupancy is the OR of Occupancy Scheduler Control, Occupancy Override Control and Occupancy Sensor Input; no input can force unoccupied. Jumper TB1-8 to 9 so the unit runs occupied backup setpoints if the module link fails.

Heartbeat & communication loss

Application Mode Control (AO 101, thermostat mode) and Space Temperature Input (AO 113, BACnet sensor mode) must be rewritten within 5 minutes or the IMC goes to its backup mode; Lennox recommends updating them at least every 2 minutes.

Sensors & values from the BMS

With a BACnet zone sensor, write the space temperature to AO 113 and the setpoint to AO 109 (plus offset AO 110). The IMC derives occupied heat/cool setpoints from the single setpoint and the ECTO 6.15 deadband (default 3 °F). When updates stop it falls back to ECTO backup setpoints and a Lennox zone sensor or the return air sensor.

Network setup

BACnet MS/TP at a fixed 38.4 kbps; up to 31 modules per network.
MAC and device ID come from the IMC unit address DIP switch, 1-31 (do not use 0).
Every module has the device name 'Lennox'; it cannot be changed.
Terminate only the last module with the supplied 120 ohm resistor.

Watch out for

COV is not supported; poll the values.
After power-up the unit stays off up to 5 minutes until the BMS sends a setpoint and sensor value or a thermostat command.
Writing 101-255 to AO 102, 127 or 128 returns that value to local IMC control.
Unit Status 145-177 are heat pump defrost states, not faults.

Lennox IMC BACnet Module 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.

48 of 48 shown

Type

Binary

Access

Units

Show

Lennox IMC BACnet Module BACnet Points List
			Description			States
BI	100	Controller Online	IMC communicating with the BACnet module		Read	0 = Not communicating, 1 = Communicating
AOmin	101	Application Mode Control	Unit application mode command (coded values)		Write	0 = Auto, 1 = Heat, 3 = Cool, 6 = Off, 9 = Fan only, 208 = Fan auto, 209 = Fan on, 216 = Exhaust auto, 217 = Exhaust on, 218 = Exhaust off, 224-236 = remote thermostat stage commands, 254 = Reset, 255 = Null
AO	102	Outdoor Air Min Pos Control	Minimum economizer damper position; 101-255 = local	%	Write
AO	103	Occupancy Override Control	Occupancy override		Write	0 = Occupied, 1 = Unoccupied (not supported, auto), 2 = Refresh override timer, 3-255 = Auto
AOmin	104	Occupancy Scheduler Control	Scheduled occupancy		Write	0 = Occupied, 1-255 = Unoccupied
AO	107	Occupancy Sensor Input	Occupancy sensor value from the network		Write	0 = Occupied, 1 = Unoccupied (not supported, auto), 2-255 = Auto
AO	108	Space Dehumidification Setpt	Zone relative humidity setpoint	%	Write
AOmin	109	Temperature Setpoint (abs)	Zone temperature setpoint	°F	Write
AO	110	Temperature Setpoint Offset	Zone temperature setpoint offset	°F	Write
AOmin	113	Space Temperature Input	Zone temperature from a BACnet sensor	°F	Write
AO	114	Emergency Override Control	Smoke/emergency mode		Write	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 capacity limit; 0 = disabled, 101-255 = full	%	Write
AO	117	Primary Heat Enable Control	Primary heat capacity limit	%	Write
AO	119	Auxiliary Heat Enable Control	Auxiliary heat capacity limit	%	Write
AO	123	Duct Static Setpoint	Duct static pressure setpoint	inH2O	Write
AO	124	Building Static Setpoint	Building static pressure setpoint	inH2O	Write
AO	125	Discharge Air Cooling Setpoint	Discharge air cooling setpoint	°F	Write
AO	126	Discharge Air Heating Setpoint	Discharge air heating setpoint	°F	Write
AO	127	Supply Fan Capacity Input	Supply fan speed, % of max; 101-255 = local	%	Write
AO	128	Exhaust Fan Capacity Input	Exhaust fan speed, % of max; 101-255 = local	%	Write
AI	200	IMC Version[00], IMC Version[01], ..., IMC Version[07]	IMC firmware version characters (null-terminated ASCII); AI 200-207		Read
AI	231	Unit ID	Unit type code		Read	48-63 = Gas heat/electric cool, 64-79 = Electric/electric, 80-95 = Heat pump
AImin	232	Unit Status	Unit operating mode		Read	1 = Heat, 2 = Morning warmup, 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	Zone temperature in use	°F	Read
AImin	240	Discharge Air Temperature	Discharge (supply) air temperature	°F	Read
AImin	241	Effective Occupancy	Resulting occupancy		Read	0 = Occupied, 1 = Unoccupied, 2 = Occupied (timed override)
AI	242	Local Outside Air Temperature	Outdoor air temperature from IMC sensor	°F	Read
AI	243	Local Space Temperature	Zone temperature from IMC sensor	°F	Read
AI	244	Outdoor Air Damper	Economizer damper position; 255 = no damper	%	Read
AI	245	Heat Primary	Primary heating capacity running	%	Read
AI	246	Heat Secondary	Secondary (auxiliary) heating capacity running	%	Read
AI	247	Cool Primary	Cooling capacity running	%	Read
AI	248	Economizer Enabled	Outdoor air suitable for free cooling		Read	0 = Disabled, 1 = Enabled, 255 = No economizer
AImin	250	Supply Fan Status	Supply fan state or speed	%	Read	0 = Off, 1 = On (single speed), 2-100 = speed %
AI	252	Space Temperature Setpt (Eff)	Zone temperature setpoint in effect	°F	Read
AImin	253	Current Error	Active alarm code; 0 = none		Read
AI	254	Error Pointer	Next alarm log location, 0-83		Read
AI	255	Most Recent Error 1, Most Recent Error 2, ..., Most Recent Error 10	Ten most recent alarm codes; AI 255-264		Read
AI	274	Space CO2 Sensor (Eff)	Zone CO2 in use	ppm	Read
AI	275	Space CO2 Sensor (Local)	Zone CO2 from IMC sensor	ppm	Read
AI	276	Space Humidity (Eff)	Zone humidity in use	%	Read
AI	277	Space Humidity (Local)	Zone humidity from IMC sensor	%	Read
AI	278	Dehumidification Setpt (Eff)	Humidity setpoint in effect	%	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	inH2O	Read
AI	283	Duct Static Pressure	Duct static pressure	inH2O	Read
AI	285	Exhaust Fan Status	Exhaust fan state or speed	%	Read

Object ID lookup: Lennox IMC BACnet Module point IDs by name

BI100Controller Online
AO101Application Mode Control
AO102Outdoor Air Min Pos Control
AO103Occupancy Override Control
AO104Occupancy Scheduler Control
AO107Occupancy Sensor Input
AO108Space Dehumidification Setpt
AO109Temperature Setpoint (abs)
AO110Temperature Setpoint Offset
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
AI200IMC Version[00], IMC Version[01], ..., IMC Version[07]
AI231Unit ID
AI232Unit Status
AI239Space Temperature
AI240Discharge Air Temperature
AI241Effective Occupancy
AI242Local Outside Air Temperature
AI243Local Space Temperature
AI244Outdoor Air Damper
AI245Heat Primary
AI246Heat Secondary
AI247Cool Primary
AI248Economizer Enabled
AI250Supply Fan Status
AI252Space Temperature Setpt (Eff)
AI253Current Error
AI254Error Pointer
AI255Most Recent Error 1, Most Recent Error 2, ..., Most Recent Error 10
AI274Space CO2 Sensor (Eff)
AI275Space CO2 Sensor (Local)
AI276Space Humidity (Eff)
AI277Space Humidity (Local)
AI278Dehumidification Setpt (Eff)
AI279Dehumidification Status
AI281Return Air Temperature
AI282Building Static Pressure
AI283Duct Static Pressure
AI285Exhaust Fan Status

Integration notes

AI 244 is named 'Outdoor Air Damper' on its per-object page; the summary table (Table 6) calls it 'Outside Air Damper'.
AI 274-277: the summary table lists only Space CO2 Sensor (Local) at AI 274 and Space Humidity (Local) at AI 276, while the per-object pages put the effective values at 274/276 and the local values at 275/277. The per-object pages are followed here.
The document prints IMC Version[00]..[07] (AI 200-207) and Most Recent Error 1..10 (AI 255-264) only as patterns; each is listed here as one row at its first instance. The other instances exist but their names are not printed individually.
AO 102, 127 and 128 hand control back to the IMC when written with 101-255.
Stage commands 224-236 on AO 101 only work when the IMC is set for remote thermostat operation.
Alarm code meanings are in the IMC user guide, not this document.

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 IMC BACnet Module 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 IMC BACnet Module

How many BACnet points does the Lennox IMC BACnet Module have?

This list has 48 BACnet objects: 28 analog inputs, 19 analog outputs, 1 binary input. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Lennox IMC BACnet Module BACnet points are writable?

19 of the 48 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 IMC BACnet Module BACnet documentation?

The source is IMC BACnet Module (Service Literature) (Corp. 0624-L5), revision 02/2008, published free by Lennox at https://www.lennox.com/dA/f33c882a98/0624b.pdf.

What are the minimum BACnet points to integrate the Lennox IMC BACnet Module?

Start with AO 101 Application Mode Control (Mode: 0 auto, 1 heat, 3 cool, 6 off (more codes)); AO 104 Occupancy Scheduler Control (0 = occupied, 1-255 = unoccupied); AO 109 Temperature Setpoint (abs) (Zone temperature setpoint, °F); AO 113 Space Temperature Input (Zone temp from the BMS in BACnet sensor mode); AI 232 Unit Status (Operating mode: heat, cool, off, fan only and more); AI 241 Effective Occupancy (0 occupied, 1 unoccupied, 2 timed override); AI 239 Space Temperature (Zone temperature in use); AI 240 Discharge Air Temperature (Supply air temperature); AI 250 Supply Fan Status (0 off, 1 on, 2-100 speed %); AI 253 Current Error (Active alarm code; 0 = none).

How do I enable BMS control of the Lennox IMC BACnet Module?

Does the Lennox IMC BACnet Module need a BACnet heartbeat or have a communication timeout?

Can the BMS supply sensor values to the Lennox IMC BACnet Module?

How do I check these points on the real IMC BACnet Module?

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: IMC BACnet Module (Service Literature) · Corp. 0624-L5 · rev. 02/2008. Object names, instances and units are reproduced as published; descriptions are our own.