{
 "manufacturer": "Lennox",
 "manufacturer_slug": "lennox",
 "model": "IMC BACnet Module",
 "model_slug": "imc-bacnet-module",
 "short_model": "IMC BACnet Module",
 "aliases": [
  "Lennox IMC BACnet",
  "IMC M1-7",
  "M1-7 BACnet",
  "0624-L5",
  "L Series IMC BACnet"
 ],
 "equipment_type": "Rooftop unit controller BACnet module",
 "applies_to": "Lennox rooftop units with the IMC (M1-7, v5.02 or later) unit controller and the IMC BACnet module.",
 "summary": "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.",
 "bacnet_transport": [
  "BACnet MS/TP"
 ],
 "firmware": "IMC M1-7 v5.02 or later",
 "default_device_instance": null,
 "access_inferred": false,
 "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."
 ],
 "source": {
  "title": "IMC BACnet Module (Service Literature)",
  "doc_number": "Corp. 0624-L5",
  "revision_date": "02/2008",
  "url": "https://www.lennox.com/dA/f33c882a98/0624b.pdf"
 },
 "integration": {
  "summary": "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": [
   {
    "ref": "AO 101",
    "name": "Application Mode Control",
    "why": "Mode: 0 auto, 1 heat, 3 cool, 6 off (more codes)"
   },
   {
    "ref": "AO 104",
    "name": "Occupancy Scheduler Control",
    "why": "0 = occupied, 1-255 = unoccupied"
   },
   {
    "ref": "AO 109",
    "name": "Temperature Setpoint (abs)",
    "why": "Zone temperature setpoint, °F"
   },
   {
    "ref": "AO 113",
    "name": "Space Temperature Input",
    "why": "Zone temp from the BMS in BACnet sensor mode"
   },
   {
    "ref": "AI 232",
    "name": "Unit Status",
    "why": "Operating mode: heat, cool, off, fan only and more"
   },
   {
    "ref": "AI 241",
    "name": "Effective Occupancy",
    "why": "0 occupied, 1 unoccupied, 2 timed override"
   },
   {
    "ref": "AI 239",
    "name": "Space Temperature",
    "why": "Zone temperature in use"
   },
   {
    "ref": "AI 240",
    "name": "Discharge Air Temperature",
    "why": "Supply air temperature"
   },
   {
    "ref": "AI 250",
    "name": "Supply Fan Status",
    "why": "0 off, 1 on, 2-100 speed %"
   },
   {
    "ref": "AI 253",
    "name": "Current Error",
    "why": "Active alarm code; 0 = none"
   }
  ],
  "enable": "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": "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.",
  "remote_sensors": "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.",
  "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."
  ],
  "gotchas": [
   "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."
  ]
 },
 "points": [
  {
   "type": "BI",
   "instance": 100,
   "name": "Controller Online",
   "description": "IMC communicating with the BACnet module",
   "units": "",
   "access": "R",
   "states": "0 = Not communicating, 1 = Communicating"
  },
  {
   "type": "AO",
   "instance": 101,
   "name": "Application Mode Control",
   "description": "Unit application mode command (coded values)",
   "units": "",
   "access": "W",
   "states": "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"
  },
  {
   "type": "AO",
   "instance": 102,
   "name": "Outdoor Air Min Pos Control",
   "description": "Minimum economizer damper position; 101-255 = local",
   "units": "%",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 103,
   "name": "Occupancy Override Control",
   "description": "Occupancy override",
   "units": "",
   "access": "W",
   "states": "0 = Occupied, 1 = Unoccupied (not supported, auto), 2 = Refresh override timer, 3-255 = Auto"
  },
  {
   "type": "AO",
   "instance": 104,
   "name": "Occupancy Scheduler Control",
   "description": "Scheduled occupancy",
   "units": "",
   "access": "W",
   "states": "0 = Occupied, 1-255 = Unoccupied"
  },
  {
   "type": "AO",
   "instance": 107,
   "name": "Occupancy Sensor Input",
   "description": "Occupancy sensor value from the network",
   "units": "",
   "access": "W",
   "states": "0 = Occupied, 1 = Unoccupied (not supported, auto), 2-255 = Auto"
  },
  {
   "type": "AO",
   "instance": 108,
   "name": "Space Dehumidification Setpt",
   "description": "Zone relative humidity setpoint",
   "units": "%",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 109,
   "name": "Temperature Setpoint (abs)",
   "description": "Zone temperature setpoint",
   "units": "°F",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 110,
   "name": "Temperature Setpoint Offset",
   "description": "Zone temperature setpoint offset",
   "units": "°F",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 113,
   "name": "Space Temperature Input",
   "description": "Zone temperature from a BACnet sensor",
   "units": "°F",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 114,
   "name": "Emergency Override Control",
   "description": "Smoke/emergency mode",
   "units": "",
   "access": "W",
   "states": "0 = Normal, 1 = Pressurize, 2 = Depressurize (speed), 3 = Purge (speed), 4 = Shutdown, 5 = Fire, 6 = Depressurize (pressure), 7 = Purge (pressure), >7 = Normal"
  },
  {
   "type": "AO",
   "instance": 115,
   "name": "Compressor Enable Control",
   "description": "Compressor capacity limit; 0 = disabled, 101-255 = full",
   "units": "%",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 117,
   "name": "Primary Heat Enable Control",
   "description": "Primary heat capacity limit",
   "units": "%",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 119,
   "name": "Auxiliary Heat Enable Control",
   "description": "Auxiliary heat capacity limit",
   "units": "%",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 123,
   "name": "Duct Static Setpoint",
   "description": "Duct static pressure setpoint",
   "units": "inH2O",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 124,
   "name": "Building Static Setpoint",
   "description": "Building static pressure setpoint",
   "units": "inH2O",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 125,
   "name": "Discharge Air Cooling Setpoint",
   "description": "Discharge air cooling setpoint",
   "units": "°F",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 126,
   "name": "Discharge Air Heating Setpoint",
   "description": "Discharge air heating setpoint",
   "units": "°F",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 127,
   "name": "Supply Fan Capacity Input",
   "description": "Supply fan speed, % of max; 101-255 = local",
   "units": "%",
   "access": "W",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 128,
   "name": "Exhaust Fan Capacity Input",
   "description": "Exhaust fan speed, % of max; 101-255 = local",
   "units": "%",
   "access": "W",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 200,
   "name": "IMC Version[00], IMC Version[01], ..., IMC Version[07]",
   "description": "IMC firmware version characters (null-terminated ASCII); AI 200-207",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 231,
   "name": "Unit ID",
   "description": "Unit type code",
   "units": "",
   "access": "R",
   "states": "48-63 = Gas heat/electric cool, 64-79 = Electric/electric, 80-95 = Heat pump"
  },
  {
   "type": "AI",
   "instance": 232,
   "name": "Unit Status",
   "description": "Unit operating mode",
   "units": "",
   "access": "R",
   "states": "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"
  },
  {
   "type": "AI",
   "instance": 239,
   "name": "Space Temperature",
   "description": "Zone temperature in use",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 240,
   "name": "Discharge Air Temperature",
   "description": "Discharge (supply) air temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 241,
   "name": "Effective Occupancy",
   "description": "Resulting occupancy",
   "units": "",
   "access": "R",
   "states": "0 = Occupied, 1 = Unoccupied, 2 = Occupied (timed override)"
  },
  {
   "type": "AI",
   "instance": 242,
   "name": "Local Outside Air Temperature",
   "description": "Outdoor air temperature from IMC sensor",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 243,
   "name": "Local Space Temperature",
   "description": "Zone temperature from IMC sensor",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 244,
   "name": "Outdoor Air Damper",
   "description": "Economizer damper position; 255 = no damper",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 245,
   "name": "Heat Primary",
   "description": "Primary heating capacity running",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 246,
   "name": "Heat Secondary",
   "description": "Secondary (auxiliary) heating capacity running",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 247,
   "name": "Cool Primary",
   "description": "Cooling capacity running",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 248,
   "name": "Economizer Enabled",
   "description": "Outdoor air suitable for free cooling",
   "units": "",
   "access": "R",
   "states": "0 = Disabled, 1 = Enabled, 255 = No economizer"
  },
  {
   "type": "AI",
   "instance": 250,
   "name": "Supply Fan Status",
   "description": "Supply fan state or speed",
   "units": "%",
   "access": "R",
   "states": "0 = Off, 1 = On (single speed), 2-100 = speed %"
  },
  {
   "type": "AI",
   "instance": 252,
   "name": "Space Temperature Setpt (Eff)",
   "description": "Zone temperature setpoint in effect",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 253,
   "name": "Current Error",
   "description": "Active alarm code; 0 = none",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 254,
   "name": "Error Pointer",
   "description": "Next alarm log location, 0-83",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 255,
   "name": "Most Recent Error 1, Most Recent Error 2, ..., Most Recent Error 10",
   "description": "Ten most recent alarm codes; AI 255-264",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 274,
   "name": "Space CO2 Sensor (Eff)",
   "description": "Zone CO2 in use",
   "units": "ppm",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 275,
   "name": "Space CO2 Sensor (Local)",
   "description": "Zone CO2 from IMC sensor",
   "units": "ppm",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 276,
   "name": "Space Humidity (Eff)",
   "description": "Zone humidity in use",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 277,
   "name": "Space Humidity (Local)",
   "description": "Zone humidity from IMC sensor",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 278,
   "name": "Dehumidification Setpt (Eff)",
   "description": "Humidity setpoint in effect",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 279,
   "name": "Dehumidification Status",
   "description": "Dehumidification state",
   "units": "",
   "access": "R",
   "states": "0 = Not installed, 1 = Installed, not running, 2 = Running"
  },
  {
   "type": "AI",
   "instance": 281,
   "name": "Return Air Temperature",
   "description": "Return air temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 282,
   "name": "Building Static Pressure",
   "description": "Building static pressure",
   "units": "inH2O",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 283,
   "name": "Duct Static Pressure",
   "description": "Duct static pressure",
   "units": "inH2O",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 285,
   "name": "Exhaust Fan Status",
   "description": "Exhaust fan state or speed",
   "units": "%",
   "access": "R",
   "states": ""
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/lennox/imc-bacnet-module",
 "note": "Provided as-is. Point availability varies by firmware and options; verify against the live device.",
 "disclaimer": "DISCLAIMER: reference only, provided AS IS with no warranty. May contain errors or be out of date. You must verify every point against the manufacturer's current documentation and the live device before use. easybacnet.com accepts no liability for its use and is not affiliated with the manufacturer. Terms: https://easybacnet.com/terms#content"
}