{
 "manufacturer": "Siemens",
 "manufacturer_slug": "siemens",
 "model": "BACnet PTEC Unit Vent Controller - Application 6676 (Heating and/or Chilled Water Cooling, ASHRAE Cycle III)",
 "model_slug": "ptec-6676-unit-ventilator-ashrae-cycle-iii",
 "short_model": "PTEC Unit Ventilator 6676",
 "aliases": [
  "PTEC 6676",
  "Application 6676",
  "App 6676",
  "550-493PA",
  "Siemens unit ventilator",
  "ASHRAE Cycle III"
 ],
 "equipment_type": "Unit ventilator (terminal unit) controller",
 "applies_to": "Unit ventilators with a chilled water coil and/or a hot water, steam or electric heating coil, run to ASHRAE Cycle III on the Siemens BACnet PTEC unit vent controller 550-493PA.",
 "summary": "Application 6676 controls a unit ventilator to ASHRAE Cycle III on a Siemens BACnet PTEC controller over BACnet MS/TP. Room temperature is held by modulating the coil valves directly (or a face-bypass damper with 2-position valves), and the outdoor air damper holds a mixed air temperature setpoint above its minimum position. It supports 2-pipe or 4-pipe coils, up to three electric heat stages, auxiliary radiation, morning warm-up/cool-down, night override and free cooling.",
 "bacnet_transport": [
  "BACnet MS/TP"
 ],
 "firmware": "Newer than revision Bx40",
 "default_device_instance": null,
 "access_inferred": true,
 "notes": [
  "AI and BI objects are read-only. AO and BO objects are BACnet output objects with a priority array; the guide has no access column, so access is inferred from object type. Many AOs are calculated status values, not commands.",
  "Instances shown in braces in the guide may be unbundled at a field panel; that marking is not reproduced here.",
  "Units are given in US units (°F, Btu/lb); the guide also lists SI factory defaults.",
  "The guide covers controllers with firmware newer than revision Bx40; older firmware has separate documentation.",
  "LOW TEMP DET (BI 26) state texts are printed as Active = OFF and Inactive = ON; they are kept as printed.",
  "With 1 VLV HTGCLG (BO 16) = YES (2-pipe), heat/cool switchover must come from PPCL or the field panel commanding HEAT.COOL; otherwise it is automatic."
 ],
 "source": {
  "title": "BACnet PTEC Controller Unit Vent - Heating and/or Chilled Water Cooling, ASHRAE Cycle III, Application 6676, Application Note",
  "doc_number": "140-1181",
  "revision_date": "2018-01-23",
  "url": "https://sid.siemens.com/api/khub/documents/lDFatYOxLHYD043TCJd_1A/content"
 },
 "integration": {
  "summary": "Address the controller on the BACnet MS/TP trunk (manually or with auto addressing), then release the unit to application control. The BMS commands occupancy with DAY.NGT (BO 29) and the day setpoints, turns free cooling on and off with FREE CLG (BO 23), and reads room temperature, fan status, outdoor air damper position, the low temperature detector and the error status.",
  "minimum_points": [
   {
    "ref": "BO 29",
    "name": "DAY.NGT",
    "why": "DAY = occupied, NIGHT = unoccupied"
   },
   {
    "ref": "BO 23",
    "name": "FREE CLG",
    "why": "Free cooling / economizer enable"
   },
   {
    "ref": "AO 6",
    "name": "DAY CLG STPT",
    "why": "Occupied cooling setpoint, °F"
   },
   {
    "ref": "AO 7",
    "name": "DAY HTG STPT",
    "why": "Occupied heating setpoint, °F"
   },
   {
    "ref": "BO 5",
    "name": "HEAT.COOL",
    "why": "Current mode: HEAT or COOL"
   },
   {
    "ref": "BO 50",
    "name": "FAN",
    "why": "Fan on/off"
   },
   {
    "ref": "AI 4",
    "name": "ROOM TEMP",
    "why": "Space temperature"
   },
   {
    "ref": "AO 62",
    "name": "OA DMPR POS",
    "why": "Outdoor air damper position, %"
   },
   {
    "ref": "BI 26",
    "name": "LOW TEMP DET",
    "why": "Low temperature detection thermostat"
   },
   {
    "ref": "AO 99",
    "name": "ERROR STATUS",
    "why": "Controller error code"
   }
  ],
  "enable": "Occupancy is DAY.NGT (BO 29). With a wall switch on DI 2 and WALL SWITCH (BO 18) = YES, the switch sets it; standalone with no switch the controller stays in day mode; on a network the field panel or BMS commands DAY.NGT. NGT OVRD (BO 21) shows a temporary night override from the room unit button.",
  "heartbeat": null,
  "remote_sensors": "The field panel (or PPCL) turns the free cooling/economizer function on and off by writing FREE CLG (BO 23); with it disabled the outdoor air damper stays at OADPR MINPOS.",
  "setup": [
   "BACnet MS/TP only. CTLR ADDRESS (AO 1) holds the MS/TP address; the factory value is 255.",
   "APPLICATION (AO 2) holds the application number; the point table lists its factory default as 6695."
  ],
  "gotchas": [
   "As shipped, the controller keeps all equipment OFF until it is released to application control (see Siemens start-up procedures).",
   "With a digital room unit (revision 26 and later), a command sent through the room unit puts the matching BACnet input Out Of Service.",
   "Loop gains, biases, output span/start settings and setup codes are commissioning values; don't write them from the BMS routinely.",
   "A low temperature detection thermostat on BI 26 is strongly recommended for hot water and steam coils."
  ]
 },
 "points": [
  {
   "type": "AO",
   "instance": 1,
   "name": "CTLR ADDRESS",
   "description": "Controller MS/TP address",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 2,
   "name": "APPLICATION",
   "description": "Application number running in the controller",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 3,
   "name": "TEMP OFFSET",
   "description": "Room temperature calibration offset",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 4,
   "name": "ROOM TEMP",
   "description": "Room temperature from the room unit",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "BO",
   "instance": 5,
   "name": "HEAT.COOL",
   "description": "Current heating/cooling mode",
   "units": "",
   "access": "C",
   "states": "0=COOL, 1=HEAT"
  },
  {
   "type": "AO",
   "instance": 6,
   "name": "DAY CLG STPT",
   "description": "Day (occupied) cooling setpoint",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 7,
   "name": "DAY HTG STPT",
   "description": "Day (occupied) heating setpoint",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 8,
   "name": "NGT CLG STPT",
   "description": "Night (unoccupied) cooling setpoint",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 9,
   "name": "NGT HTG STPT",
   "description": "Night (unoccupied) heating setpoint",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 10,
   "name": "OADPR MINPOS",
   "description": "Outdoor air damper minimum position",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 11,
   "name": "RM STPT MIN",
   "description": "Lowest setpoint allowed from the room unit",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 12,
   "name": "RM STPT MAX",
   "description": "Highest setpoint allowed from the room unit",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 13,
   "name": "RM STPT DIAL",
   "description": "Setpoint from the room unit dial or keypad",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "BO",
   "instance": 14,
   "name": "STPT DIAL",
   "description": "Use the room unit setpoint dial",
   "units": "",
   "access": "C",
   "states": "0=NO, 1=YES"
  },
  {
   "type": "AI",
   "instance": 15,
   "name": "MA TEMP",
   "description": "Mixed air temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "BO",
   "instance": 16,
   "name": "1 VLV HTGCLG",
   "description": "One coil and valve for heating and cooling (2-pipe)",
   "units": "",
   "access": "C",
   "states": "0=NO, 1=YES"
  },
  {
   "type": "BO",
   "instance": 17,
   "name": "FBP.MODVALVE",
   "description": "Coil control: face-bypass damper or modulating valve",
   "units": "",
   "access": "C",
   "states": "0=VALVE, 1=FBP"
  },
  {
   "type": "BO",
   "instance": 18,
   "name": "WALL SWITCH",
   "description": "Wall switch connected to DI 2",
   "units": "",
   "access": "C",
   "states": "0=NO, 1=YES"
  },
  {
   "type": "BI",
   "instance": 19,
   "name": "DI OVRD SW",
   "description": "Room unit night override button",
   "units": "",
   "access": "R",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "AO",
   "instance": 20,
   "name": "OVRD TIME",
   "description": "Night override duration",
   "units": "h",
   "access": "C",
   "states": ""
  },
  {
   "type": "BO",
   "instance": 21,
   "name": "NGT OVRD",
   "description": "Night override status",
   "units": "",
   "access": "C",
   "states": "0=DAY, 1=NIGHT"
  },
  {
   "type": "BO",
   "instance": 22,
   "name": "AUX.NOAUX",
   "description": "Auxiliary radiation used (AUX) or not",
   "units": "",
   "access": "C",
   "states": "0=NOAUX, 1=AUX"
  },
  {
   "type": "BO",
   "instance": 23,
   "name": "FREE CLG",
   "description": "Free cooling (economizer) enable",
   "units": "",
   "access": "C",
   "states": "0=DISABL, 1=ENABLE"
  },
  {
   "type": "BI",
   "instance": 24,
   "name": "DI 2",
   "description": "Digital input 2",
   "units": "",
   "access": "R",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BI",
   "instance": 25,
   "name": "DI 5",
   "description": "Digital input 5",
   "units": "",
   "access": "R",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BI",
   "instance": 26,
   "name": "LOW TEMP DET",
   "description": "Low temperature detection thermostat (LTDT)",
   "units": "",
   "access": "R",
   "states": "0=ON, 1=OFF"
  },
  {
   "type": "BO",
   "instance": 27,
   "name": "ELEC.NOELEC",
   "description": "Heating coil is electric (ELEC) or not",
   "units": "",
   "access": "C",
   "states": "0=NOELEC, 1=ELEC"
  },
  {
   "type": "BO",
   "instance": 28,
   "name": "FBP.2PSVCTL",
   "description": "2-position valve control with face-bypass damper",
   "units": "",
   "access": "C",
   "states": "0=DISABL, 1=ENABLE"
  },
  {
   "type": "BO",
   "instance": 29,
   "name": "DAY.NGT",
   "description": "Day/night (occupancy) mode",
   "units": "",
   "access": "C",
   "states": "0=DAY, 1=NIGHT"
  },
  {
   "type": "BO",
   "instance": 30,
   "name": "WRMUP.COOLDN",
   "description": "Morning warm-up / cool-down",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "AO",
   "instance": 31,
   "name": "AOV1 SPAN",
   "description": "AOV1 output span",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 32,
   "name": "AOV1 START",
   "description": "AOV1 output start voltage",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 33,
   "name": "AOV2 SPAN",
   "description": "AOV2 output span",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 34,
   "name": "AOV2 START",
   "description": "AOV2 output start voltage",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 35,
   "name": "AOV3 SPAN",
   "description": "AOV3 output span",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 36,
   "name": "AOV3 START",
   "description": "AOV3 output start voltage",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 37,
   "name": "AO DIR.REV",
   "description": "Analog output direction reverse (additive code)",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 38,
   "name": "AOV1",
   "description": "Analog output 1 (0-10 V)",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 39,
   "name": "AOV2",
   "description": "Analog output 2 (0-10 V)",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 40,
   "name": "AOV3",
   "description": "Analog output 3 (0-10 V)",
   "units": "V",
   "access": "C",
   "states": ""
  },
  {
   "type": "BO",
   "instance": 41,
   "name": "AUX RAD",
   "description": "Auxiliary radiation output (contact or 2-position valve)",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BO",
   "instance": 42,
   "name": "DO 2",
   "description": "Digital output 2",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BO",
   "instance": 43,
   "name": "HTG 2POS VLV",
   "description": "2-position heating valve output",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BO",
   "instance": 44,
   "name": "CLG 2POS VLV",
   "description": "2-position cooling valve output",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BO",
   "instance": 45,
   "name": "EHEAT 1",
   "description": "Electric heat stage 1 output",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BO",
   "instance": 46,
   "name": "EHEAT 2",
   "description": "Electric heat stage 2 output",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BO",
   "instance": 47,
   "name": "EHEAT 3",
   "description": "Electric heat stage 3 output",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "AI",
   "instance": 48,
   "name": "AI 3",
   "description": "Spare analog input 3",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 49,
   "name": "AUX TEMP AI4",
   "description": "Auxiliary temperature input on AI 4",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "BO",
   "instance": 50,
   "name": "FAN",
   "description": "Fan command",
   "units": "",
   "access": "C",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BI",
   "instance": 51,
   "name": "DI 3",
   "description": "Digital input 3",
   "units": "",
   "access": "R",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BI",
   "instance": 52,
   "name": "DI 4",
   "description": "Digital input 4",
   "units": "",
   "access": "R",
   "states": "0=OFF, 1=ON"
  },
  {
   "type": "BO",
   "instance": 53,
   "name": "NGT HW HTG",
   "description": "Hot water coil at night (YES) or steam (NO)",
   "units": "",
   "access": "C",
   "states": "0=NO, 1=YES"
  },
  {
   "type": "BO",
   "instance": 54,
   "name": "NGT CLG MODE",
   "description": "Cooling allowed in night mode",
   "units": "",
   "access": "C",
   "states": "0=NO, 1=YES"
  },
  {
   "type": "AO",
   "instance": 55,
   "name": "AUX OUTPUT",
   "description": "Auxiliary radiation output",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 57,
   "name": "AUX HTG TIME",
   "description": "Auxiliary radiation cycle time",
   "units": "min",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 58,
   "name": "EHT STG DELY",
   "description": "Minimum time between electric heat stage changes",
   "units": "s",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 59,
   "name": "DO DIR.REV",
   "description": "Digital output direction reverse (additive code)",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 60,
   "name": "HTG OUTPUT",
   "description": "Heating coil output",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 61,
   "name": "CLG OUTPUT",
   "description": "Cooling coil output",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 62,
   "name": "OA DMPR POS",
   "description": "Outdoor air damper position",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 63,
   "name": "CLG P GAIN",
   "description": "Cooling loop proportional gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 64,
   "name": "CLG I GAIN",
   "description": "Cooling loop integral gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 65,
   "name": "CLG D GAIN",
   "description": "Cooling loop derivative gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 66,
   "name": "CLG BIAS",
   "description": "Cooling loop bias",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 67,
   "name": "HTG P GAIN",
   "description": "Heating loop proportional gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 68,
   "name": "HTG I GAIN",
   "description": "Heating loop integral gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 69,
   "name": "HTG D GAIN",
   "description": "Heating loop derivative gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 70,
   "name": "HTG BIAS",
   "description": "Heating loop bias",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 77,
   "name": "MA LOOPOUT",
   "description": "Mixed air loop output",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 78,
   "name": "CTL TEMP",
   "description": "Temperature the controller is controlling to",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 79,
   "name": "CLG LOOPOUT",
   "description": "Cooling loop output",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 80,
   "name": "HTG LOOPOUT",
   "description": "Heating loop output",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 81,
   "name": "MA P GAIN",
   "description": "Mixed air loop proportional gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 82,
   "name": "MA I GAIN",
   "description": "Mixed air loop integral gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 83,
   "name": "MA D GAIN",
   "description": "Mixed air loop derivative gain",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 84,
   "name": "MA BIAS",
   "description": "Mixed air loop bias",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 85,
   "name": "SWITCH LIMIT",
   "description": "Loop output below which mode may switch",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 86,
   "name": "SWITCH TIME",
   "description": "Minimum time before heat/cool switchover",
   "units": "min",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 88,
   "name": "NGT DBAND",
   "description": "Night mode fan deadband",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 89,
   "name": "MORN DBAND",
   "description": "Morning warm-up / cool-down deadband",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 90,
   "name": "SWITCH DBAND",
   "description": "Temperature deadband for heat/cool switchover",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 92,
   "name": "CTL STPT",
   "description": "Active control setpoint",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 93,
   "name": "MA STPT",
   "description": "Mixed air temperature setpoint",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 98,
   "name": "LOOP TIME",
   "description": "Control loop interval",
   "units": "s",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 99,
   "name": "ERROR STATUS",
   "description": "Controller error status code",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 106,
   "name": "STPT SPAN",
   "description": "Room unit setpoint adjustment span",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 121,
   "name": "DEW POINT",
   "description": "Room dew point",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 122,
   "name": "ENTHALPY",
   "description": "Room enthalpy",
   "units": "Btu/lb",
   "access": "C",
   "states": ""
  },
  {
   "type": "AO",
   "instance": 124,
   "name": "SENSOR SEL",
   "description": "Room unit / sensor select code (additive)",
   "units": "",
   "access": "C",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 125,
   "name": "RM CO2",
   "description": "Room CO2",
   "units": "ppm",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 126,
   "name": "RM RH",
   "description": "Room relative humidity",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "BO",
   "instance": 127,
   "name": "PPCL STATE",
   "description": "PPCL program loaded or empty",
   "units": "",
   "access": "C",
   "states": "0=EMPTY, 1=LOADED"
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/siemens/ptec-6676-unit-ventilator-ashrae-cycle-iii",
 "note": "Re-typed from the manufacturer's public documentation (see source). Point availability varies by firmware and options; verify against the live device."
}