{
 "manufacturer": "Lochinvar",
 "manufacturer_slug": "lochinvar",
 "model": "SYNC",
 "model_slug": "sync",
 "aliases": [
  "SYNC 1.0",
  "SYNC 1.3",
  "SYNC 1.5",
  "SYNC-MODB"
 ],
 "equipment_type": "Dual-heat-exchanger condensing boiler controller",
 "applies_to": "SYNC 1.0, 1.3 and 1.5 condensing boilers (two heat exchangers, reported as unit 1 and unit 2).",
 "summary": "The SYNC boiler has two heat exchangers in one cabinet, so its BACnet MS/TP map repeats the flame, switch, temperature and status points for unit 1 and unit 2. Access is through Lochinvar's Modbus/BACnet communication board.",
 "bacnet_transport": [
  "BACnet MS/TP"
 ],
 "firmware": null,
 "default_device_instance": "630000 + MAC address (base is model dependent and 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."
 ],
 "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": "Unit 1 Status Code",
    "why": "What heat exchanger 1 is doing; 40 = lockout"
   },
   {
    "ref": "AI 22",
    "name": "Unit 2 Status Code",
    "why": "What heat exchanger 2 is doing; 40 = lockout"
   },
   {
    "ref": "AI 8",
    "name": "Outlet Temperature 1",
    "why": "Outlet temperature, heat exchanger 1"
   },
   {
    "ref": "AI 17",
    "name": "Outlet Temperature 2",
    "why": "Outlet temperature, heat exchanger 2"
   },
   {
    "ref": "AI 15",
    "name": "Unit 1 Lockout Code",
    "why": "Lockout cause, heat exchanger 1; valid only at status 40"
   },
   {
    "ref": "AI 24",
    "name": "Unit 2 Lockout Code",
    "why": "Lockout cause, heat exchanger 2; valid only at status 40"
   }
  ],
  "enable": "Set Demand Configuration 4, 5 or 6 under Main > Setup > Service/Setup > Demand Config. 4: local setpoints plus BV 0 enable. 5: enable plus AV 2 rate command. 6: AV 2 modulation % alone. 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 or commands stop arriving, the unit reverts to its own readings and controls. The timeout is set under Main > Setup > BMS > Modbus / BACnet Timeout; the manual gives 5-120 s with a 10 s default in one place and 0-120 s in another. Every write resets it, and Lochinvar recommends the shortest value. Commands without temperatures must be refreshed at least every 4 minutes.",
  "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. 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 630000 + MAC address; the base can be changed."
  ],
  "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.",
   "Status, temperature and code points come in pairs for heat exchanger 1 and 2."
  ]
 },
 "source": {
  "title": "Modbus and BACnet Communication Instructions (SYNC 1.0 - 1.3 - 1.5)",
  "doc_number": "SYNC-MODB_100161723_2000017706",
  "revision_date": "Rev L, 05/17",
  "url": "https://assets.lochinvar.com/damroot/Original/10014/594260SYNC-MODB_100161723_2000017706__REV%20L_BACNET.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 1",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 1,
   "name": "Flow Switch 1",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 2,
   "name": "Gas Pressure Switch 1",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 3,
   "name": "Louver Proving Switch 1",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 4,
   "name": "Flap Valve 1",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 5,
   "name": "Blocked Drain Switch 1",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 6,
   "name": "Auto Reset High Limit 1",
   "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",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 9,
   "name": "Tank Thermostat",
   "description": "Tank / DHW thermostat call",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 16,
   "name": "Manual Reset High Limit 2",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 17,
   "name": "Flow Switch 2",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 18,
   "name": "Gas Pressure Switch 2",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 19,
   "name": "Louver Proving Switch 2",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 20,
   "name": "Flap Valve 2",
   "description": "Safety / proving switch status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 21,
   "name": "Blocked Drain Switch 2",
   "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": 32,
   "name": "Run-time Contacts 1",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 33,
   "name": "Alarm Contacts 1",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 34,
   "name": "Boiler Pump 1",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 35,
   "name": "DHW Pump 1",
   "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": "Run-time Contacts 2",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 41,
   "name": "Alarm Contacts 2",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 42,
   "name": "Boiler Pump 2",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 43,
   "name": "DHW Pump 2",
   "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": 48,
   "name": "Fan 1 Power",
   "description": "Output or relay status",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BI",
   "instance": 49,
   "name": "Fan 2 Power",
   "description": "Output or relay 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": 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 1",
   "description": "Setpoint value",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 8,
   "name": "Outlet Temperature 1",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 9,
   "name": "Inlet Temperature 1",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 10,
   "name": "Flue Temperature 1",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 11,
   "name": "Firing Rate 1",
   "description": "Burner firing rate",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 13,
   "name": "Unit 1 Status Code",
   "description": "Current operating status code",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 14,
   "name": "Unit 1 Blocking Code",
   "description": "Active blocking (soft lockout) code",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 15,
   "name": "Unit 1 Lockout Code",
   "description": "Active lockout code",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 16,
   "name": "Outlet Setpoint 2",
   "description": "Setpoint value",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 17,
   "name": "Outlet Temperature 2",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 18,
   "name": "Inlet Temperature 2",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 19,
   "name": "Flue Temperature 2",
   "description": "Temperature reading",
   "units": "°C",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 20,
   "name": "Firing Rate 2",
   "description": "Burner firing rate",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 22,
   "name": "Unit 2 Status Code",
   "description": "Current operating status code",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 23,
   "name": "Unit 2 Blocking Code",
   "description": "Active blocking (soft lockout) code",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 24,
   "name": "Unit 2 Lockout Code",
   "description": "Active lockout code",
   "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": "AV",
   "instance": 0,
   "name": "Configuration",
   "description": "Bitmask selecting which values the BAS supplies",
   "units": "",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 1,
   "name": "Binary Values",
   "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": ""
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/lochinvar/sync",
 "note": "Re-typed from the manufacturer's public documentation (see source). Point availability varies by firmware and options; verify against the live device."
}