{
 "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": "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"
}