{
 "manufacturer": "Melink",
 "manufacturer_slug": "melink",
 "model": "Intelli-Hood IH4 Exhaust Fan / Auxiliary Airflow",
 "model_slug": "intelli-hood-ih4-exhaust-fan",
 "aliases": [
  "Intelli-Hood",
  "IH4",
  "IH4-SC",
  "Melink IH4",
  "Intelli-Hood 4"
 ],
 "equipment_type": "Kitchen exhaust / make-up air fan VFD device (Intelli-Hood demand ventilation)",
 "applies_to": "Each exhaust fan and auxiliary airflow (make-up air fan) VFD run by a Melink Intelli-Hood 4 system.",
 "summary": "On a Melink Intelli-Hood 4 system every exhaust fan and auxiliary airflow (typically a make-up air unit) VFD appears as its own virtual BACnet IP device behind the System Controller. Each device has the same eight objects: run status, VFD fault, a fault reset, maximum frequency, commanded and actual speed, current and kWh. Fan speed is set by the Intelli-Hood from hood temperature and smoke, not by the BMS.",
 "bacnet_transport": [
  "BACnet IP",
  "BACnet IPv6"
 ],
 "firmware": "Application 4.0, firmware 1.0.0",
 "default_device_instance": null,
 "access_inferred": false,
 "notes": [
  "The same object list repeats on every exhaust fan and auxiliary airflow device; only the Device ID differs.",
  "Output Current is not updated for System VFDs; Output Energy is not updated for System and Allen-Bradley PowerFlex 4/40 VFDs.",
  "Actual speed lags commanded speed during VFD ramp up and ramp down; that difference is normal.",
  "To get speed in Hz, multiply the % speed by Maximum Output Frequency (AV 0).",
  "A fan can be hidden from BACnet with its 'Active on BACnet' setting (default Yes for fans)."
 ],
 "source": {
  "title": "Intelli-Hood BACnet Protocol Implementation Conformance Statement (PICS)",
  "doc_number": null,
  "revision_date": "Revision 250723 (PICS dated 07-18-2025)",
  "url": "https://melinkcorp.com/wp-content/uploads/2021/10/IH4_BACnet_PICS.pdf"
 },
 "integration": {
  "summary": "Read run status, actual speed and the VFD fault flag from each fan device; add the kWh counter for energy tracking. The BMS can only clear VFD faults (BV 2); speed and start/stop come from the Intelli-Hood.",
  "minimum_points": [
   {
    "ref": "BV 2",
    "name": "Reset VFD Fault",
    "why": "Write Active to clear a VFD fault"
   },
   {
    "ref": "BV 0",
    "name": "Operation Status",
    "why": "Fan running (Active) or stopped"
   },
   {
    "ref": "AV 2",
    "name": "% Actual Speed",
    "why": "Speed reported by the VFD, %"
   },
   {
    "ref": "AV 1",
    "name": "% Commanded Speed",
    "why": "Speed the Intelli-Hood is asking for, %"
   },
   {
    "ref": "AV 4",
    "name": "Output Energy",
    "why": "VFD kWh counter (rolls over)"
   },
   {
    "ref": "BV 1",
    "name": "Fault Active",
    "why": "VFD tripped or lost comms with the Intelli-Hood"
   }
  ],
  "enable": "No BACnet start/stop or speed command. Fans are started from the Touchpad, schedules or digital inputs; use the Virtual Input Module to do that over BACnet.",
  "heartbeat": null,
  "remote_sensors": null,
  "setup": [
   "The System Controller is the main BACnet IP device (default Device ID 654000) and a virtual router (default DNET 654) for the fan, hood controller and virtual module devices; UDP port 47808.",
   "With BACnet Auto Number on (default), the virtual devices are numbered from 654001: exhaust fans and auxiliary airflows (sorted by name), then hood controllers, virtual output modules, virtual input modules.",
   "IP defaults to DHCP. BACnet runs on IPv4 or IPv6, not both; for IPv6 set IP Type to 'IPv4 & IPv6' and BACnet IP Type to IPv6 (multicast scope default ff05).",
   "Settings are on the Touchpad (System Controller configuration) or the web configurator at http://<controller IP>/ih4-configurator.",
   "Check each fan's Device ID on the Touchpad: Status > VFDs, then press the progress bar above the device name."
  ],
  "gotchas": [
   "Front ends that send Who-Is without routing only find the System Controller; run a network/router discovery, select the router with the Intelli-Hood DNET, then discover devices again.",
   "The DNET must be unique; another router or BBMD using 654 breaks access to the virtual devices.",
   "Clearing a VFD fault before the cause is fixed can damage the VFD, motor or fan.",
   "Putting BV 2 Reset VFD Fault Out of Service disables it; writes then do nothing.",
   "Output Energy rolls over on every VFD; poll it often enough to catch the rollover."
  ]
 },
 "points": [
  {
   "type": "BV",
   "instance": 0,
   "name": "Operation Status",
   "description": "Fan running or stopped",
   "units": "",
   "access": "R",
   "states": "Inactive = Stopped, Active = Running"
  },
  {
   "type": "BV",
   "instance": 1,
   "name": "Fault Active",
   "description": "VFD tripped or lost communication with the Intelli-Hood",
   "units": "",
   "access": "R",
   "states": "Inactive = No, Active = Yes"
  },
  {
   "type": "BV",
   "instance": 2,
   "name": "Reset VFD Fault",
   "description": "Write Active to try clearing the VFD fault; reads back Inactive",
   "units": "",
   "access": "C",
   "states": "Inactive = No, Active = Yes"
  },
  {
   "type": "AV",
   "instance": 0,
   "name": "Maximum Output Frequency",
   "description": "Fan maximum speed, 0-254 Hz",
   "units": "Hz",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 1,
   "name": "% Commanded Speed",
   "description": "Speed the Intelli-Hood is commanding, 0-100 %",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 2,
   "name": "% Actual Speed",
   "description": "Speed reported by the VFD, 0-100 %",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 3,
   "name": "Output Current",
   "description": "VFD output current; not updated for System VFDs",
   "units": "A",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 4,
   "name": "Output Energy",
   "description": "VFD kWh counter; rolls over, not on all VFDs",
   "units": "kWh",
   "access": "R",
   "states": ""
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/melink/intelli-hood-ih4-exhaust-fan",
 "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"
}