{
 "manufacturer": "Carrier",
 "manufacturer_slug": "carrier",
 "model": "VVT Bypass II",
 "model_slug": "vvt-bypass-ii",
 "aliases": [
  "OPN-VVTBP-02",
  "VVT Bypass II controller",
  "i-Vu VVT Bypass",
  "11-808-601-01"
 ],
 "equipment_type": "VVT bypass damper / duct static pressure controller (terminal zoning)",
 "applies_to": "Bypass dampers or supply-fan VFDs in Carrier VVT systems, controlled by the VVT Bypass II (OPN-VVTBP-02).",
 "summary": "The VVT Bypass II holds supply duct static pressure in a Carrier VVT system by modulating its own bypass damper actuator, an external actuator or the air source fan VFD through a 0-10 Vdc output. It talks BACnet MS/TP or BACnet ARC156 and is normally linked to the VVT Master and air source. Its BACnet points are mostly read-only status: static pressure, the controlling setpoint, damper or VFD output, supply air temperature and two alarms.",
 "bacnet_transport": [
  "BACnet MS/TP",
  "BACnet ARC156"
 ],
 "firmware": null,
 "default_device_instance": null,
 "access_inferred": false,
 "notes": [
  "The duct static pressure setpoint itself is not in the BACnet list; Controlling Pressure Setpoint (AV:1015) only reports the setpoint in use.",
  "Damper Position applies when the controller drives a damper; VFD output applies when Control Device Type is set to VFD.",
  "With linkage active the controller uses the air source's supply air temperature and follows its Pressurization mode."
 ],
 "source": {
  "title": "VVT Bypass II Controller Installation and Start-up Guide (Appendix B: BACnet points list)",
  "doc_number": "11-808-601-01",
  "revision_date": "2026-01-28",
  "url": "https://www.shareddocs.com/hvac/docs/1000/Public/02/11-808-601-01.pdf"
 },
 "integration": {
  "summary": "This is a monitoring device for a BMS: the static pressure loop runs inside the controller and through Carrier linkage. Read duct static pressure, the setpoint in use and the damper or VFD output, and alarm on supply air temperature and linkage failure.",
  "minimum_points": [
   {
    "ref": "AV 1016",
    "name": "static_press",
    "why": "Measured supply duct static pressure, in H2O"
   },
   {
    "ref": "AV 1015",
    "name": "sys_press_stpt",
    "why": "Static pressure setpoint currently in use"
   },
   {
    "ref": "AV 1013",
    "name": "dpr_pos",
    "why": "Bypass damper position, %"
   },
   {
    "ref": "AV 1014",
    "name": "vfd_output",
    "why": "Fan VFD output when VFD control is set, %"
   },
   {
    "ref": "AV 1008",
    "name": "sa_temp",
    "why": "Supply air temperature"
   },
   {
    "ref": "BV 1013",
    "name": "lat_control",
    "why": "Raising pressure to protect against SAT limits"
   },
   {
    "ref": "BV 7004",
    "name": "sat_alarm",
    "why": "Supply air temperature outside the SAT limits"
   },
   {
    "ref": "BV 7030",
    "name": "air_linkage_fail",
    "why": "Linkage to the air source lost"
   }
  ],
  "enable": null,
  "heartbeat": null,
  "remote_sensors": null,
  "setup": [
   "MS/TP address is set on the Tens and Ones rotary switches; the factory 00 must be changed.",
   "MS/TP baud (9600 to 76.8 kbps) is set on DIP switches; ARC156 runs at 156 kbps via the ARC156/MS/TP jumper.",
   "Control Device Type (BV:99002) selects actuator (0) or VFD (1) output."
  ],
  "gotchas": [
   "If the supply air temperature reaches the Minimum Cooling SAT (45 °F) or Maximum Heating SAT (120 °F), the controller switches to its LAT static pressure setpoint and reports the airflow increase (AV:5002).",
   "If static pressure drops below 10% of setpoint with the damper shut (or VFD at max) for 1 minute, the controller assumes the fan is off and parks the damper at 65%."
  ]
 },
 "points": [
  {
   "type": "AV",
   "instance": 1008,
   "name": "sa_temp",
   "description": "Supply Air Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 1013,
   "name": "dpr_pos",
   "description": "Damper Position",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 1014,
   "name": "vfd_output",
   "description": "VFD output",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 1015,
   "name": "sys_press_stpt",
   "description": "Controlling Pressure Setpoint",
   "units": "in H2O",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 1016,
   "name": "static_press",
   "description": "Static Pressure - Prime Variable",
   "units": "in H2O",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 2608,
   "name": "link_sat",
   "description": "Air Source Supply Air Temp",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 3016,
   "name": "press_hysteresis",
   "description": "Pressure Control Deadband (default 0.05)",
   "units": "in H2O",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 5002,
   "name": "lat_airflow_inc",
   "description": "LAT Airflow Increase",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 5003,
   "name": "max_press_stpt",
   "description": "Maximum Duct Pressure Setpoint",
   "units": "in H2O",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 9007,
   "name": "start_delay",
   "description": "Power Fail Restart Delay (default 60)",
   "units": "sec",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 83003,
   "name": "sat_cl_min",
   "description": "Minimum Cooling SAT (default 45)",
   "units": "°F",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 83004,
   "name": "sat_ht_max",
   "description": "Maximum Heating SAT (default 120)",
   "units": "°F",
   "access": "W",
   "states": ""
  },
  {
   "type": "BV",
   "instance": 1013,
   "name": "lat_control",
   "description": "LAT Control",
   "units": "",
   "access": "R",
   "states": "0=Off; 1=Active"
  },
  {
   "type": "BV",
   "instance": 2601,
   "name": "a_link_status",
   "description": "Airside Linkage Status",
   "units": "",
   "access": "R",
   "states": "0=Not Active; 1=Active"
  },
  {
   "type": "BV",
   "instance": 7004,
   "name": "sat_alarm",
   "description": "Supply Air Temperature Alarm",
   "units": "",
   "access": "R",
   "states": "0=Normal; 1=Alarm"
  },
  {
   "type": "BV",
   "instance": 7030,
   "name": "air_linkage_fail",
   "description": "Airside Linkage Alarm",
   "units": "",
   "access": "R",
   "states": "0=Normal; 1=Alarm"
  },
  {
   "type": "BV",
   "instance": 99002,
   "name": "ctrl_type",
   "description": "Control Device Type (default Inactive (0))",
   "units": "",
   "access": "W",
   "states": "0=Actuator; 1=VFD"
  },
  {
   "type": "BV",
   "instance": 99003,
   "name": "auto_adjust",
   "description": "Automatic Deadband Adjustment (default Active (1))",
   "units": "",
   "access": "W",
   "states": "0=Disable; 1=Enable"
  },
  {
   "type": "MV",
   "instance": 2005,
   "name": "link_ahu_mode",
   "description": "Air Source Mode",
   "units": "",
   "access": "R",
   "states": "1=Off; 2=Warmup; 3=Heat; 4=Cool; 5=Freecool; 6=Pressure; 7=Evac; 8=Vent"
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/carrier/vvt-bypass-ii",
 "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"
}