{
 "manufacturer": "York",
 "manufacturer_slug": "york",
 "model": "YIA Absorption Chiller (SC-EQ)",
 "model_slug": "yia-sc-eq",
 "short_model": "YIA",
 "aliases": [
  "YORK YIA",
  "YIA absorption",
  "SC-EQ",
  "SE-SCC1001-1"
 ],
 "equipment_type": "Absorption chiller, steam or hot water (via SC-EQ card)",
 "applies_to": "YORK YIA steam- or hot-water-fired absorption chillers fitted with the SC-EQ communication card.",
 "summary": "The YIA's SC-EQ card puts the absorption chiller on a BACnet MS/TP trunk (it also speaks Modbus RTU and N2). The BAS can run/stop the chiller and write the leaving chilled water setpoint and load limit. Read-only points cover chilled and condenser water temperatures, generator and purge pressures, strong solution temperature and concentration, steam or hot water supply values, pump status and multistate operation, shutdown, warning and inhibit codes.",
 "bacnet_transport": [
  "BACnet MS/TP"
 ],
 "firmware": "SC-EQ software 3.4.0.12",
 "default_device_instance": "5000 + MAC address",
 "access_inferred": true,
 "notes": [
  "Access is inferred: the sheet has no read/write column. The remote block (AV 1-2, BV 1) is treated as commandable; everything else as read-only.",
  "Status-code MVs (MV 1-4, MV 6-8) are the printed code + 1, as the doc's status code tables say. MV 5 is shown as printed, from 0; BACnet multistate values start at 1, so the card may report the printed number + 1. Confirm by discovery.",
  "Steam supply pressure only applies to steam units; generator and purge pressures are in mmHg.",
  "This list has no MV 65001 Units object and no AV copies of the code MVs.",
  "Spare objects (AV 3-4, BV 2-4 and the empty rows) are left out."
 ],
 "source": {
  "title": "YIA SC-EQ BAS Points List",
  "doc_number": null,
  "revision_date": "Rev 1.1, 2020-12-18",
  "url": "https://docs.johnsoncontrols.com/chillers/api/khub/documents/MgPyIEusbCBvjQ2NPPH0uw/content"
 },
 "integration": {
  "summary": "Wire the BAS to the SC-EQ RS-485 port and set the MAC address; the card detects BACnet MS/TP. Run/stop the chiller with BV 1 and write the leaving chilled water setpoint (AV 1) and load limit (AV 2). Read MV 1 for the operating state, the chilled water temperatures and MV 2/MV 3 for safety and cycling shutdowns. MV 5 shows whether the chiller is under ISN (BAS) control.",
  "minimum_points": [
   {
    "ref": "BV 1",
    "name": "REM RUN STOP CMD",
    "why": "Remote run/stop (1 = run)"
   },
   {
    "ref": "AV 1",
    "name": "REM LEAVING CHW TEMP SP",
    "why": "Remote leaving chilled water setpoint"
   },
   {
    "ref": "AV 2",
    "name": "REM LOAD LIMIT SP",
    "why": "Remote load limit, %"
   },
   {
    "ref": "MV 1",
    "name": "OPERATIONAL CODE",
    "why": "Operating state (ready, starting, running)"
   },
   {
    "ref": "MV 5",
    "name": "UNIT CONTROL SOURCE",
    "why": "Control source; ISN (BAS) for BMS control"
   },
   {
    "ref": "AV 5",
    "name": "LEAVING CHW TEMP",
    "why": "Leaving chilled water temperature"
   },
   {
    "ref": "AV 6",
    "name": "ENTERING CHW TEMP",
    "why": "Return chilled water temperature"
   },
   {
    "ref": "MV 2",
    "name": "SAFETY SHUTDOWN CODE",
    "why": "Safety shutdown code (1 = none)"
   },
   {
    "ref": "MV 3",
    "name": "CYCLING SHUTDOWN CODE",
    "why": "Cycling shutdown code (1 = none)"
   }
  ],
  "enable": "BV 1 REM RUN STOP CMD (0 = Stop, 1 = Run) is the BAS run/stop; AV 1 and AV 2 are the remote setpoints. MV 5 shows the control source (Local, ISN, Analog, Digital); it should read ISN for BAS control. The points list has no write-enable point.",
  "heartbeat": null,
  "remote_sensors": null,
  "setup": [
   "The BAS connects to the SC-EQ J12 port (RS-485: +, -, COM/REF, SHLD). The card detects BACnet MS/TP, Modbus RTU or N2 and the baud rate by itself; allow up to 120 seconds after power-up.",
   "The MAC address (1-127) is set on DIP switch SW1 (switch 8 unused). Cycle the card's power after changing it.",
   "The device instance defaults to 5000 + the MAC address (MAC 6 gives 5006). To use another number, set Device Instance Mode to Manual and enter the instance with the SC-AP / MAP tool, or write BV 65000 (mode) and AV 65000 (instance ID)."
  ],
  "gotchas": [
   "The remote (commandable) setpoints read as unreliable until the BAS writes them the first time.",
   "The SC-EQ only exposes the points that apply to the chiller it detects; if it replaces an E-Link, re-discover the device so old non-applicable points don't sit offline.",
   "The safety code table (SC.2, MV 2) has several crystallization-check and dilution-cycle faults, and the control status code (SC.12, MV 6) shows when a dilution cycle is running."
  ]
 },
 "points": [
  {
   "type": "AV",
   "instance": 1,
   "name": "REM LEAVING CHW TEMP SP",
   "description": "Remote Leaving Chilled Liquid Setpoint",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 2,
   "name": "REM LOAD LIMIT SP",
   "description": "Remote Load Limit Setpoint",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "BV",
   "instance": 1,
   "name": "REM RUN STOP CMD",
   "description": "Remote Run/Stop",
   "units": "",
   "access": "C",
   "states": "0=Stop, 1=Run"
  },
  {
   "type": "AV",
   "instance": 5,
   "name": "LEAVING CHW TEMP",
   "description": "Leaving Chilled Water Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 6,
   "name": "ENTERING CHW TEMP",
   "description": "Return Chilled Water Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 7,
   "name": "GENERATOR PRESSURE",
   "description": "Generator Shell Pressure",
   "units": "mmHg",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 10,
   "name": "LEAVING COND WATER TEMP",
   "description": "Leaving Condenser Water Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 11,
   "name": "ENTERING COND WATER TEMP",
   "description": "Return Condenser Water Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 12,
   "name": "AUTO DECRYSTLZATION TEMP",
   "description": "Automatic Decrystallization Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 13,
   "name": "REFRIG TEMP LEAVING COND",
   "description": "Refrigerant Temperature Leaving the Condenser",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 14,
   "name": "STEAM HOT WATER SUP TEMP",
   "description": "Steam / Hot Water Supply Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 15,
   "name": "STEAM SUPPLY PRESSURE",
   "description": "Steam Supply Pressure (steam units only)",
   "units": "PSIA",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 16,
   "name": "STEAM HT WTR ACT VLV POS",
   "description": "Steam / Hot Water Actuator Valve Position",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 18,
   "name": "PURGE PMP SERV INTRVL SP",
   "description": "Purge Pump Service Interval Setpoint - Hours",
   "units": "Hr",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 19,
   "name": "LEAVING CHW TEMP ACT SP",
   "description": "Active Leaving Chilled Water Setpoint",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 21,
   "name": "REFRIGERANT TEMP",
   "description": "Refrigerant Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 22,
   "name": "STRONG SOLUTION TEMP",
   "description": "Strong Solution Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 23,
   "name": "STRONG SOLUTION CONC",
   "description": "Strong Solution Concentation %",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 26,
   "name": "ACCUM OPERATING HOURS",
   "description": "Total Operating Hours",
   "units": "Hr",
   "access": "R",
   "states": ""
  },
  {
   "type": "BV",
   "instance": 5,
   "name": "REFRIG MOTOR STATUS",
   "description": "Refrigerant Pump Motor Status",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 6,
   "name": "COND MOTOR STATUS",
   "description": "Condenser Water Pump Status",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 7,
   "name": "CHW PUMP STAT",
   "description": "Chilled Water Pump Status",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 10,
   "name": "SOLU ABSORB PMP MTR STAT",
   "description": "Solution / Absorber Pump Motor Status",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 12,
   "name": "PURGE PMP MTR STAT",
   "description": "Purge Pump Motor Status",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 14,
   "name": "REFRIG STAB SOL VLV STAT",
   "description": "Refrigerant Stabilizer Solenoid Valve Status",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 17,
   "name": "REFRIG LVL FLO SW STAT",
   "description": "Refrigerant Level Float Switch Status",
   "units": "",
   "access": "R",
   "states": "0=Open, 1=Closed"
  },
  {
   "type": "MV",
   "instance": 1,
   "name": "OPERATIONAL CODE",
   "description": "Operational Code",
   "units": "",
   "access": "R",
   "states": "1=No Unit Operation Conditions Present, 2=System Ready to Start, 3=System Starting, 4=System Running, 5=Safety Shutdown -Reset to Restart, 6=Cycling Shutdown -Autostart-, 7=System Start Inhibited, 8=Unit Starting, 9=Unit Running - No Abnormal Condition, 10=Unit Running - Warning Active, 13=Unit Running- Modified Run, 14=Unit Running - Internal Shutdown"
  },
  {
   "type": "MV",
   "instance": 2,
   "name": "SAFETY SHUTDOWN CODE",
   "description": "Safety Shutdown Code",
   "units": "",
   "access": "R",
   "states": "1=No Safety Faults Present, 2=Solution Pump Overload -Chk Crystallization-, 3=Solution Pump Overloads Opened, 4=Refrigerant Pump Overloads Opened, 5=Generator hi-Press Digital Switch HP1 Opened, 6=Generator hi-press Analog Switch PT1 >672 mmHg, 7=Low Refrigerant Temp Digital LRT Opened, 8=Low Refrigerant Temp Analog RT8 < 33F (0.56C), 9=Gen Hi-Temp Dig Switch HT1 Opened -Man Reset-, 10=Gen Hi-Temp Analog Switch RT3 > 330F(166C), 11=Auxiliary TB1-31 Device Opened, 12=Manual Restart After Power is Restored, 13=Chilled Liquid Flow Switch Opened, 14=High Steam Supply Temp RT7 > Maximum Allowed, 15=High Hot Water Supply Temp RT7 > Maximum Allowed, 16=Low Motor Coolant Level -MCFL Switch Opened-, 17=Refrigerant Pump Level Switch 3F Failure, 18=Solution Pump Overload Twice -Chk for Cryst-, 19=Ref Pump Overload Twice -Chk for Cryst-, 20=Soln Low Temp & Evap Flow SW Open -Chk Cryst-, 21=Soln Low Temp & Low Ref Temp Shdwn -Chk Cryst-, 22=High Steam Supply Press PT2 > 35PSIA (241.3KPA), 23=RT3 Low Temp While MCFL Shutdown -Chk Cryst-, 24=RT3 Low Temp After Power Failure -Chk Cryst-, 25=Condenser Liquid Flow Switch Opened, 26=High Concentration in Strong Solution, 27=MCFL Switch Opened, LDC Interrumped -Chk Cryst-, 28=Cond Flow Switch Closed During Limited Dilution, 29=Dilution Cycle Interrupted -Switch 3F Opened-, 30=Dilution Cycle Interrupted -Chilled Water Off-, 31=Dilution Cycle Interrupted -Cond Water Off-, 32=Solution Pump Overload Contacts are in Conflict, 33=Refrigerant pump Overload Contacts are in Conflict, 34=Start Prohibited at this Moment"
  },
  {
   "type": "MV",
   "instance": 3,
   "name": "CYCLING SHUTDOWN CODE",
   "description": "Cycling Shutdown Code",
   "units": "",
   "access": "R",
   "states": "1=No Cycling Faults Present, 2=Power Failure Ocurred, 3=Low Leaving Chilled Liquid Temperature, 4=Unit Shutdown by Remote Device, 5=Unit Shutdown by Multi-Unit Remote, 6=Daily Schedule Programmed Stop, 7=Emergency Power Source Activated"
  },
  {
   "type": "MV",
   "instance": 4,
   "name": "WARNING MESSAGE CODE",
   "description": "Warning Message Code",
   "units": "",
   "access": "R",
   "states": "1=No Warnings Present, 2=Low ref temp in evap RT8<34.0F(1.1C) –sol pump is off-, 3=Low refrigerant temperature in evap RT8<35.5F(1.9C), 4=Generator High Pressure >517 mmHg -Load set to 30%-, 5=Purge Pump Overloads Opened, 6=Faulty Strong Solution Temp Sensor RT3, 7=High Steam Supply Press PT2>32PSIA (22O.6KPA), 8=High Hot Water Supply Temp RT7 > Warning Temp, 9=High Steam Supply Temp RT7 > Warning Temp, 10=Purge Pump Service Recommended, 11=Autopurge Failure -Purge Tank Press Doesn't Decrease-, 12=Excess Purging in the Last 7 Days -See Setpoint-, 13=Purge Tank Pressure is >100mmHg, 14=Purge Pump Overload Contacts are in Conflict, 15=Purge Transducer PT4 out of Range, 16=8SOL Failure; PT3>100mmHg -Manually Close VP2 & VP4-, 17=Purge Pump Failure -Manually Close VP2 & VP4-, 18=Autopurge Failure; PT3>15mmHg -Check Purge Pump-, 19=Refrigerant Level Switch Conflict -CHK 1F&3F-, 20=Refrigerant from Condenser RT9 or Shell Press PT1 Conflict"
  },
  {
   "type": "MV",
   "instance": 5,
   "name": "UNIT CONTROL SOURCE",
   "description": "Unit Control Source",
   "units": "",
   "access": "R",
   "states": "0=Local, 1=ISN, 2=Analog, 3=Digital"
  },
  {
   "type": "MV",
   "instance": 6,
   "name": "UNIT CONTROL STATUS CODE",
   "description": "Unit Control Status Code",
   "units": "",
   "access": "R",
   "states": "1=No Modified Run Conditions Present, 2=Cooling Start Sequence Initiated, 3=Unit Load has Reached the Remote Load Limit Setpoint, 4=Leaving Chilled Liquid Temperature Control in Effect, 5=Unit Load is Controlled by Pulldown Demand Limit, 6=Unit Load is Controlled by Rampdown Limit, 7=Unit Load has Reached the Maximum Load Limit Setpoint, 8=Manual Operation Control in Effect, 9=Dilution Cycle is in Progress, 10=Limited Dilution Cycle is in Progress, 11=Unit Load is set to 30%, 12=Unit Load is set to 60%, 13=Manual Dilution Cycle is in Progress, 14=Unit Load is Inhibited by Low Refrigerant Temp. Condition, 15=ADC in Progress -Load set to 50%-, 16=Primary Limited ADC in Progress - Load set to 50%-, 17=Secondary Limited ADC in Progress, 18=Unit in Standby Until Power Supply Recovers, 19=Unit is Unable to Perform a Limited Dilution Cycle, 20=Primary Limited ADC in Progress - Load set to 50%-"
  },
  {
   "type": "MV",
   "instance": 7,
   "name": "UNIT INHIBIT FAULT CODE",
   "description": "Unit Inhibit Fault Code",
   "units": "",
   "access": "R",
   "states": "1=No Inhibit Faults Present, 2=Generator hi-press Analog Switch PT1 >672 mmHg, 3=Low Refrigerant Temp Analog RT8 < 33F (0.56C), 4=Auxiliary TB1-31 Device Opened, 5=Leaving Chilled Liquid Temp < Setpoint, 6=Unit Shutdown by Remote Device, 7=HW Valve Loaded>10% Close to <9% to Restart, 8=Steam Valve Loaded >10% Close to <9% to Restart, 9=Unit Shutdown by Multi-Unit Remote"
  },
  {
   "type": "MV",
   "instance": 8,
   "name": "UNIT INTERNAL FAULT CODE",
   "description": "Unit Internal Fault Code",
   "units": "",
   "access": "R",
   "states": "1=No Internal Faults Present, 2=Watchdog - Software Reboot, 3=Internal User Interface Error, 4=User Interface unable to establish comms with control"
  },
  {
   "type": "AV",
   "instance": 30,
   "name": "ACTIVE MAX LOAD LIMIT SP",
   "description": "Active Maximum Load Limit Setpoint",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 32,
   "name": "WEEKLY PURGE COUNTER",
   "description": "Weekly Purge Counter",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 33,
   "name": "PULLDOWN INTERVAL TIMER",
   "description": "Pulldown Interval Timer - Minutes",
   "units": "Min",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 35,
   "name": "PULLDOWN DEMAND SP START",
   "description": "Pulldown Demand Setpoint - Start Load Limit",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 36,
   "name": "PULLDOWN DEMAND SP STOP",
   "description": "Pulldown Demand Setpoint - Stop Load Limit",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 37,
   "name": "PURGE TANK PRESSURE",
   "description": "Purge Tank Pressure",
   "units": "mmHg",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 38,
   "name": "PURGE PUMP PRESSURE",
   "description": "Purge Pump Pressure",
   "units": "mmHg",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 39,
   "name": "STRONG SOLUTION LVG HEAT EXCH",
   "description": "Strong Solution Leaving Heat Exchanger",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "BV",
   "instance": 26,
   "name": "REFRIG LVL SOL",
   "description": "Refrigerant Level Solenoid",
   "units": "",
   "access": "R",
   "states": "0=Open, 1=Closed"
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/york/yia-sc-eq",
 "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"
}