{ "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:///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": "Re-typed from the manufacturer's public documentation (see source). Point availability varies by firmware and options; verify against the live device." }