{
 "manufacturer": "Lochinvar",
 "manufacturer_slug": "lochinvar",
 "model": "Crest",
 "model_slug": "crest",
 "aliases": [
  "Crest FB",
  "Crest OF",
  "Crest FCB",
  "Hellcat"
 ],
 "equipment_type": "Condensing boiler controller",
 "applies_to": "Crest FB/OF 751-6001 and FCB 1000-6000 condensing boilers (the manual uses the same map for Hellcat).",
 "summary": "The Crest boiler exposes BACnet MS/TP through Lochinvar's Modbus/BACnet communication board. Besides the usual enable, temperature, firing rate and status/blocking/lockout codes, larger and FCB models add dual-burner, damper, O2 trim and cascade member lockout points.",
 "bacnet_transport": [
  "BACnet MS/TP"
 ],
 "firmware": null,
 "default_device_instance": "Base + MAC address: 610000 for FB 751-2001, 670000 for FB 2501-6001, 680000 for FCB1000-6000 (base can be changed)",
 "notes": [
  "BACnet needs the optional Lochinvar Modbus/BACnet communication board; address and baud rate are set on its dip switches.",
  "The BACnet board is an MS/TP master only, so MAC addresses 0-127 are usable.",
  "AV 0 (Configuration) is a bitmask: set a bit to 1 to make the appliance use the BAS-written value instead of its own input.",
  "BAS-supplied temperatures must be rewritten every few seconds and other commands at least every 4 minutes, or the unit reverts to local control.",
  "Temperatures are in °C on the bus.",
  "Several points only exist on certain Crest sizes; the size range is given in the point description."
 ],
 "integration": {
  "summary": "Pick the BMS control mode at the boiler, then write AV 0 Configuration so the unit knows which values the BAS will supply. After that the BAS sends an enable, a rate command (AV 2), or both, and keeps rewriting them. Status, temperatures and the status, blocking and lockout codes can be read without taking control.",
  "minimum_points": [
   {
    "ref": "AV 0",
    "name": "Configuration",
    "why": "Bitmask of BAS-supplied inputs; resend before commands"
   },
   {
    "ref": "BV 0",
    "name": "Boiler Enable",
    "why": "Enable / call for heat from the BAS"
   },
   {
    "ref": "AV 2",
    "name": "0-10 Volt Input / Rate Command / Setpoint Command",
    "why": "Rate command: firing % or setpoint, per BMS Type"
   },
   {
    "ref": "AI 13",
    "name": "Boiler Status Code",
    "why": "What the boiler is doing; 40 = lockout"
   },
   {
    "ref": "AI 8",
    "name": "Outlet Temperature",
    "why": "Boiler outlet water temperature, °C"
   },
   {
    "ref": "AI 11",
    "name": "Firing Rate",
    "why": "Burner firing rate, %"
   },
   {
    "ref": "AI 15",
    "name": "Boiler Lockout Code",
    "why": "Lockout cause; valid only when status code is 40"
   }
  ],
  "enable": "Set the Demand Configuration under Main Menu > Setup > BMS. ENABLE active / BMS inactive: local setpoints plus BV 0 enable. ENABLE and BMS active: BV 0 enable plus AV 2 rate or setpoint command. ENABLE inactive / BMS active: AV 2 modulation % or setpoint alone. Always set the matching AV 0 bits first. AV 2 means firing % or temperature setpoint depending on the BMS Type setting (Power or Setpoint); as a setpoint it is scaled like a 0-10 V signal between the BMS temperatures at low and high input.",
  "heartbeat": "If BAS-written temperatures stop arriving within the timeout, the unit reverts to its own sensor inputs. On Crest the timeout is programmable from 5 to 120 s (Main Menu > Setup > BAS); Lochinvar recommends the shortest value. On Hellcat and Regent it is fixed at 300 s. Other commands must be refreshed at least every 4 minutes or the boiler runs on its own inputs.",
  "remote_sensors": "Set the AV 0 bits for the values the BAS will supply, then write them to the analog values: AV 3 tank setpoint, AV 4 tank temperature, AV 5 outdoor temperature, AV 6 system supply temperature, AV 7 system return temperature. Values are in °C. Temperatures must be rewritten every few seconds or the unit returns to its own sensors.",
  "setup": [
   "MAC address from dip switches 1-8 (master only, so 0-127); baud from switches 9-10: 9600, 19200, 38400 or 76800.",
   "Device instance = base + MAC address; bases are 610000 (FB 751-2001), 670000 (FB 2501-6001) and 680000 (FCB1000-6000). The base can be changed (0-4194048)."
  ],
  "gotchas": [
   "The manual says to resend the AV 0 configuration bits before each command.",
   "In a cascade only the Leader needs the BACnet board for control; it then reports cascade totals only, so fit a board to every unit to see each one.",
   "Without BMS mode active the board is monitor-only: the read-only points can be polled while the unit runs on its own controls.",
   "Several BI/AI points exist only on certain Crest sizes or on FCB models; check the size notes in each description."
  ]
 },
 "source": {
  "title": "Modbus and BACnet Communication Instructions (Crest FB/OF751-6001, FCB1000-6000 & Regent IWH500-1000)",
  "doc_number": "100161012_2000020084",
  "revision_date": "Rev X, 04/26",
  "url": "https://assets.lochinvar.com/damroot/Original/10017/MODB_100161012_2000020084_REV%20X_(71343).pdf"
 },
 "points": [
  {
   "type": "BV",
   "instance": 0,
   "name": "Boiler Enable",
   "description": "BAS enable command for the appliance",
   "units": "",
   "access": "W",
   "states": ""
  },
  {
   "type": "BV",
   "instance": 4,
   "name": "Tank Thermostat",
   "description": "Tank / DHW thermostat call",
   "units": "",
   "access": "W",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 0,
   "name": "Manual Reset High Limit",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 1,
   "name": "Flow Switch",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 2,
   "name": "Gas Pressure Switch",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 3,
   "name": "Louver Proving Switch",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 4,
   "name": "Proof of Closure",
   "description": "Gas valve proof of closure (FCB1000-6001 only; usable on FB/OF4001-6001)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 5,
   "name": "Blocked Drain Switch",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 7,
   "name": "Flame 1",
   "description": "Flame status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 8,
   "name": "Enable",
   "description": "Enable input status (Crest 751-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 9,
   "name": "Tank Thermostat",
   "description": "Tank / DHW thermostat call (Crest 751-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 10,
   "name": "Blocked Vent Switch",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 12,
   "name": "Fan 2 Proving Switch",
   "description": "Second fan proving switch (751-6001 only; older dual-fan models)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 17,
   "name": "Internal LWCO",
   "description": "Safety / proving switch status (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 18,
   "name": "Gas Pressure Switch 2",
   "description": "Safety / proving switch status (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 20,
   "name": "Flue Damper Switch",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 22,
   "name": "Flame 2",
   "description": "Flame status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 25,
   "name": "Enable",
   "description": "Enable input status (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 29,
   "name": "Tank Thermostat",
   "description": "Tank / DHW thermostat call (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 32,
   "name": "Run Time Contacts",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 33,
   "name": "Alarm Contacts",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 34,
   "name": "Boiler Pump",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 35,
   "name": "DHW Pump",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 36,
   "name": "Louver Relay",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 37,
   "name": "Gas Valve 1",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 38,
   "name": "System Pump",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 40,
   "name": "DHW Recirc Pump",
   "description": "Output or relay status (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 43,
   "name": "Flue Damper Output",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 45,
   "name": "Gas Valve 2",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 46,
   "name": "Transition Gas Valve",
   "description": "Output or relay status (Crest 751-1501 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 48,
   "name": "Main Fan 1",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 49,
   "name": "Main Fan 2",
   "description": "Output or relay status (Crest 2501-6001 only; Dual fan models only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 50,
   "name": "External Spark / HSI",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 51,
   "name": "Air Valve Trigger",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 52,
   "name": "Air Valve Proving",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 0,
   "name": "Binary Inputs 0-15",
   "description": "Packed word of binary inputs 0-15",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 1,
   "name": "Binary Inputs 16-31",
   "description": "Packed word of binary inputs 16-31",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 2,
   "name": "Binary Inputs 32-47",
   "description": "Packed word of binary inputs 32-47",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 3,
   "name": "System / Cascade Setpoint",
   "description": "Setpoint value",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 4,
   "name": "System Pump Speed",
   "description": "Pump speed output",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 5,
   "name": "Cascade Total Power",
   "description": "Total cascade firing capacity",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 6,
   "name": "Cascade Current Power",
   "description": "Current cascade firing rate",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 7,
   "name": "Outlet Setpoint",
   "description": "Setpoint value",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 8,
   "name": "Outlet Temperature",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 9,
   "name": "Inlet Temperature",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 10,
   "name": "Flue Temperature",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 11,
   "name": "Firing Rate",
   "description": "Burner firing rate",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 12,
   "name": "Boiler Pump Speed",
   "description": "Pump speed output",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 13,
   "name": "Boiler Status Code",
   "description": "Current operating status code",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 14,
   "name": "Boiler Blocking Code",
   "description": "Active blocking (soft lockout) code",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 15,
   "name": "Boiler Lockout Code",
   "description": "Active lockout code",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 18,
   "name": "Air Damper Target Angle",
   "description": "Combustion / flow value (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 19,
   "name": "Gas Damper Target Angle",
   "description": "Combustion / flow value (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 20,
   "name": "Fan Speed Target",
   "description": "Combustion / flow value (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 22,
   "name": "O2 Sensor Status",
   "description": "Combustion / flow value (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 23,
   "name": "Current Trim Factor",
   "description": "Combustion / flow value (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 24,
   "name": "Barometer",
   "description": "Combustion / flow value (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 25,
   "name": "Binary Inputs 48-63",
   "description": "Packed word of binary inputs 48-63",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 26,
   "name": "Lock-Out Error Leader",
   "description": "Lockout flag for this cascade unit",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 27,
   "name": "Lock-Out Error Member 1",
   "description": "Lockout flag for this cascade unit",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 28,
   "name": "Lock-Out Error Member 2",
   "description": "Lockout flag for this cascade unit",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 29,
   "name": "Lock-Out Error Member 3",
   "description": "Lockout flag for this cascade unit",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 30,
   "name": "Lock-Out Error Member 4",
   "description": "Lockout flag for this cascade unit",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 31,
   "name": "Lock-Out Error Member 5",
   "description": "Lockout flag for this cascade unit",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 32,
   "name": "Lock-Out Error Member 6",
   "description": "Lockout flag for this cascade unit",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 33,
   "name": "Lock-Out Error Member 7",
   "description": "Lockout flag for this cascade unit",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 35,
   "name": "Flame 1",
   "description": "Flame status (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 36,
   "name": "Flame 2",
   "description": "Flame status (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 37,
   "name": "Corrected O2 Reading",
   "description": "Combustion / flow value (Crest FCB1000-6001 only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 0,
   "name": "Configuration",
   "description": "Bitmask selecting which values the BAS supplies",
   "units": "",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 1,
   "name": "Coils",
   "description": "Packed word of the binary value commands",
   "units": "",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 2,
   "name": "0-10 Volt Input / Rate Command / Setpoint Command",
   "description": "BAS rate or setpoint command (0-100%)",
   "units": "%",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 3,
   "name": "Tank Setpoint",
   "description": "Setpoint value",
   "units": "°C",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 4,
   "name": "Tank Temperature",
   "description": "Temperature reading",
   "units": "°C",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 5,
   "name": "Outdoor Temperature",
   "description": "Temperature reading",
   "units": "°C",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 6,
   "name": "System Supply Temperature",
   "description": "Temperature reading",
   "units": "°C",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 7,
   "name": "System Return Temperature",
   "description": "Temperature reading",
   "units": "°C",
   "access": "W",
   "states": ""
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/lochinvar/crest",
 "note": "Re-typed from the manufacturer's public documentation (see source). Point availability varies by firmware and options; verify against the live device."
}