{
 "manufacturer": "York",
 "manufacturer_slug": "york",
 "model": "YS / YS HP / YN Screw Chiller (SC-EQ)",
 "model_slug": "ys-yn-sc-eq",
 "short_model": "YS / YN",
 "aliases": [
  "YORK YS",
  "YS HP",
  "YORK YN",
  "YS heat pump",
  "OptiView YS",
  "SC-EQ",
  "SE-SCC1001-1"
 ],
 "equipment_type": "Water-cooled screw chiller / heat pump (via SC-EQ card)",
 "applies_to": "YORK YS and YN water-cooled screw chillers and YS HP heat pumps with OptiView controls, fitted with the SC-EQ communication card.",
 "summary": "YS, YS HP and YN screw chillers reach a BAS through the SC-EQ communication card on BACnet MS/TP (or Modbus RTU / N2). The BAS can run/stop the unit and write the leaving chilled liquid setpoint, motor current limit, leaving hot water setpoint and operating mode. Read-only points cover water temperatures, refrigerant and oil pressures, slide valve position, solid-state starter values, and multistate operation, safety, cycling and warning codes.",
 "bacnet_transport": [
  "BACnet MS/TP"
 ],
 "firmware": "SC-EQ software 4.2.0.20",
 "default_device_instance": "5000 + MAC address",
 "access_inferred": true,
 "notes": [
  "Access is inferred: the sheet has no read/write column. The remote block (AV 1-4, BV 1) is treated as commandable and MV 65001 as writable; everything else as read-only.",
  "The hot water setpoint (AV 3), operational mode (AV 4) and active leaving heated liquid setpoint (AV 39) apply to YS HP heat pump units.",
  "Starter values (AV 13-18, AV 49-52) only report with a solid-state starter (SSS). kWh = offset x 10,000 + low.",
  "Status-code MVs (MV 1-4) are the printed code + 1, as the doc's status code tables say. MV 5 and MV 65001 are shown as printed, from 0; BACnet multistate values start at 1, so the card may report the printed number + 1. Confirm by discovery. AV 4 is an analog value and takes the printed mode number (0-2).",
  "Units shown are the IP units; with MV 65001 set to SI the card reports °C, kPa and so on.",
  "Spare objects and empty rows are left out."
 ],
 "source": {
  "title": "YS, YS HP, YN SC-EQ BAS Points List",
  "doc_number": null,
  "revision_date": "Rev 2.3, 2021-12-08",
  "url": "https://docs.johnsoncontrols.com/chillers/api/khub/documents/hSI0v36JJxo5NkdS0gNL0w/content"
 },
 "integration": {
  "summary": "Wire the BAS to the SC-EQ J12 RS-485 port and set the MAC address; the card detects BACnet MS/TP. Start/stop the unit with BV 1 and write the leaving chilled liquid setpoint (AV 1) and motor current limit (AV 2); on YS HP units also the hot water setpoint (AV 3) and mode (AV 4). Read MV 1, BV 5, the leaving water temperature and % FLA, and MV 2/MV 3 for shutdowns.",
  "minimum_points": [
   {
    "ref": "BV 1",
    "name": "REM START STOP CMD",
    "why": "Remote run/stop (1 = run)"
   },
   {
    "ref": "AV 1",
    "name": "REM LEAVING CHL TEMP SP",
    "why": "Remote leaving chilled liquid setpoint"
   },
   {
    "ref": "AV 2",
    "name": "MOTOR CURRENT REMOTE SP",
    "why": "Remote motor current limit, %"
   },
   {
    "ref": "MV 1",
    "name": "UNIT OPERATION CODE",
    "why": "Operating state (stopped, starting, running)"
   },
   {
    "ref": "BV 5",
    "name": "COMPR MOTOR STATUS",
    "why": "Compressor motor running"
   },
   {
    "ref": "MV 5",
    "name": "UNIT CONTROL SOURCE",
    "why": "Control source; ISN (BAS) for BMS control"
   },
   {
    "ref": "AV 5",
    "name": "LEAVING CH LIQ TEMP",
    "why": "Leaving chilled liquid temperature"
   },
   {
    "ref": "AV 12",
    "name": "MOTOR CURRENT PCT FLA",
    "why": "Motor current, % FLA (load indication)"
   },
   {
    "ref": "MV 2",
    "name": "UNIT SAFETY FAULT CODE",
    "why": "Safety shutdown code (1 = none)"
   },
   {
    "ref": "MV 3",
    "name": "UNIT CYCLING FAULT CODE",
    "why": "Cycling shutdown code (1 = none)"
   }
  ],
  "enable": "BV 1 REM START STOP CMD (0 = Stop, 1 = Run) is the BAS run/stop and AV 1-4 the remote setpoints and mode. MV 5 shows the control source (Local, ISN, Analog, Digital, Modem); 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).",
   "MV 65001 Units sets whether the BAS sees IP or SI values, independent of the chiller display; set it to match the chiller."
  ],
  "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.",
   "On heat pump (YS HP) units also map AV 3 (leaving hot water setpoint) and AV 4 (operating mode)."
  ]
 },
 "points": [
  {
   "type": "AV",
   "instance": 1,
   "name": "REM LEAVING CHL TEMP SP",
   "description": "Remote Leaving Chilled Liquid Setpoint",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 2,
   "name": "MOTOR CURRENT REMOTE SP",
   "description": "Motor Current Limit Setpoint",
   "units": "%",
   "access": "C",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 3,
   "name": "HOT WATER REMOTE SP",
   "description": "Leaving Heated Liquid SP",
   "units": "°F",
   "access": "C",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 4,
   "name": "OPERATIONAL MODE",
   "description": "Remote operational mode (heat pump units)",
   "units": "",
   "access": "C",
   "states": "0=Cooling, 1=Heating, 2=Cooling & Heating"
  },
  {
   "type": "BV",
   "instance": 1,
   "name": "REM START STOP CMD",
   "description": "Remote Run/Stop",
   "units": "",
   "access": "C",
   "states": "0=Stop, 1=Run"
  },
  {
   "type": "MV",
   "instance": 65001,
   "name": "Units",
   "description": "Unit system reported by the SC-EQ",
   "units": "",
   "access": "W",
   "states": "0=IP (English), 1=SI (Metric)"
  },
  {
   "type": "AV",
   "instance": 5,
   "name": "LEAVING CH LIQ TEMP",
   "description": "Leaving Chilled Liquid Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 6,
   "name": "ENTERING CH LIQ TEMP",
   "description": "Return Chilled Liquid Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 7,
   "name": "EVAPORATOR PRESSURE",
   "description": "Evaporator Pressure",
   "units": "PSIG",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 8,
   "name": "CONDENSER PRESSURE",
   "description": "Condenser Pressure",
   "units": "PSIG",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 9,
   "name": "OIL PRESSURE DIFERENTIAL",
   "description": "Oil Pressure Differential",
   "units": "PSID",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 10,
   "name": "ENTERING COND WATER TEMP",
   "description": "Return Condenser Liquid Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 11,
   "name": "LEAVING COND WATER TEMP",
   "description": "Leaving Condenser Liquid Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 12,
   "name": "MOTOR CURRENT PCT FLA",
   "description": "Motor Current Percent FLA",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 13,
   "name": "PHASE A MOTOR CURRENT",
   "description": "SSS Phase A Current (SSS only)",
   "units": "Amps",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 14,
   "name": "PHASE B MOTOR CURRENT",
   "description": "SSS Phase B Current (SSS only)",
   "units": "Amps",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 15,
   "name": "PHASE C MOTOR CURRENT",
   "description": "SSS Phase C Current (SSS only)",
   "units": "Amps",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 16,
   "name": "PHASE A_B LINE VOLTS",
   "description": "SSS Phase A Voltage (SSS only)",
   "units": "Volts",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 17,
   "name": "PHASE B_C LINE VOLTS",
   "description": "SSS Phase B Voltage (SSS only)",
   "units": "Volts",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 18,
   "name": "PHASE C_A LINE VOLTS",
   "description": "SSS Phase C Voltage (SSS only)",
   "units": "Volts",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 19,
   "name": "LEAVING CHW TEMP ACT SP",
   "description": "Leaving Chilled Liquid Setpoint - Active",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 20,
   "name": "MOTOR CURRENT ACTUAL SP",
   "description": "Motor Current Limit Setpoint - Selected",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 21,
   "name": "EVAP SATURATION TEMP",
   "description": "Evaporator Saturation Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 22,
   "name": "COND SATURATION TEMP",
   "description": "Condenser Saturation Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 23,
   "name": "DISCHARGE TEMP",
   "description": "Discharge Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 24,
   "name": "OIL SUMP TEMPERATURE",
   "description": "Oil Sump Temperature",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 26,
   "name": "ACCUM OPERATING HOURS",
   "description": "Unit Operating Hours",
   "units": "Hr",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 27,
   "name": "ACCUM SYSTEM STARTS",
   "description": "Unit System Starts",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "BV",
   "instance": 5,
   "name": "COMPR MOTOR STATUS",
   "description": "Motor Run Contacts",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 6,
   "name": "OIL RETURN SOLENOID",
   "description": "Oil Return Solenoid",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 7,
   "name": "CHW PUMP STAT",
   "description": "Chilled Liquid Pump",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 8,
   "name": "STOP SWITCH STATUS",
   "description": "Panel stop switch (start enabled / stop)",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 9,
   "name": "CHW FLOW SWITCH STAT",
   "description": "Chiller Liquid Flow Switch",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 11,
   "name": "LOW SEPARATOR OIL SWITCH",
   "description": "Low Separator Oil Switch",
   "units": "",
   "access": "R",
   "states": "0=Off, 1=On"
  },
  {
   "type": "BV",
   "instance": 24,
   "name": "ICE STORAGE MODE",
   "description": "Ice Storage Mode",
   "units": "",
   "access": "R",
   "states": "0=Disabled, 1=Enabled"
  },
  {
   "type": "MV",
   "instance": 1,
   "name": "UNIT OPERATION CODE",
   "description": "Operation Code",
   "units": "",
   "access": "R",
   "states": "1=Unit Stopped - Ready To Start, 2=Unit Stopped - Local Shutdown, 3=Unit Stopped - Remote Shutdown, 4=Unit Stopped - Warning Active, 5=Unit Stopped - Cycling Shutdown, 6=Unit Stopped - Safety Shutdown, 7=Unit Start Inhibit, 8=Unit Starting, 9=Unit Running - No Abnormal Condition, 10=Unit Running - Warning Active, 11=Unit Running - Chiller Unload Before Shutdown, 12=Unit Lockout Delay, 13=Unit Running- Modified Run, 14=Unit Stopped- Internal Shutdown"
  },
  {
   "type": "MV",
   "instance": 2,
   "name": "UNIT SAFETY FAULT CODE",
   "description": "Unit Safety Fault Code",
   "units": "",
   "access": "R",
   "states": "1=No Safety Faults Present, 2=Evaporator - Low Pressure, 3=Evaporator - Transducer Or Leaving Liquid Probe, 4=Evaporator - Transducer Or Temperature Sensor, 5=Condenser - High Pressure Contacts Open, 6=Condenser - High Pressure, 7=Condenser - Pressure Transducer Out Of Range, 8=Auxiliary Safety - Contacts Closed, 9=Discharge - Low Temperature, 10=Discharge - High Temperature, 11=Oil - High Temperature, 12=Oil - Low Differential Pressure, 13=Oil - High Differential Pressure, 14=Oil - Pump Pressure Transducer Out Of Range, 15=Oil - Sump Pressure Transducer Out Of Range, 16=Oil - High Pressure, 17=Oil - Clogged Filter, 18=Oil - Low Differential Seal Pressure, 19=Oil - Differential Pressure Calibration, 20=Oil Separator - Low Level, 21=Oil - Variable Speed Pump - Setpoint Not Achieved, 22=Control Panel - Power Failure, 23=Motor Controller Fault, 24=Motor Or Starter - Current Imbalance, 25=Thrust Bearing - Proximity Probe Clearance, 26=Thrust Bearing - Proximity Probe Uncalibrated, 27=Thrust Bearing - Proximity Probe Out Of Range, 28=High Oil Temperature, 29=Oil Temperature Probe - Out of Range, 39=LCSSS - Phase Rotation, 40=LCSSS - Motor Or Starter - Current Imbalance, 41=LCSSS - 105% Motor Current Overload, 42=LCSSS - High Instantaneous Current, 43=LCSSS - Open SCR, 44=LCSSS - Shorted Phase A SCR, 45=LCSSS - Shorted Phase B SCR, 46=LCSSS - Shorted Phase C SCR, 47=LCSSS - High Phase A Heatsink Temp - Running, 48=LCSSS - High Phase B Heatsink Temp - Running, 49=LCSSS - High Phase C Heatsink Temp- Running, 50=Starter - Invalid Motor Selection, 51=Oil Or Condenser Transducer Error, 52=Evaporator - Low Pressure, 53=Evaporator - Low Pressure - Smart Freeze, 54=Surge Protection - Excess Surge, 57=Thrust Bearing - Proximity Probe Clearance, 58=Thrust Bearing - Limit Switch Open, 59=Motor - Phase Rotation, 60=Motor - High Temperature, 61=Discharge - High Pressure, 62=High Motor Winding Temperature, 63=High Motor Bearing Temperature, 68=Condenser High Pressure Stopped, 69=Motor - Ground Fault, 70=Excessive Bearing Vibration, 71=Low Discharge Superheat, 72=LCSSS - Phase A Open SCR, 73=LCSSS - Phase B Open SCR, 74=LCSSS - Phase C Open SCR"
  },
  {
   "type": "MV",
   "instance": 3,
   "name": "UNIT CYCLING FAULT CODE",
   "description": "Unit Cycling Fault Code",
   "units": "",
   "access": "R",
   "states": "1=No Cycling Faults Present, 2=Multi-Unit Cycling - Contacts Open, 3=System Cycling - Contacts Open, 4=Oil - Low Temperature Differential, 5=Oil - Low Temperature, 6=Control Panel - Power Failure, 7=Leaving Chilled Liquid - Low Temperature, 8=Leaving Chilled Liquid - Flow Switch Open, 9=Condenser - Flow Switch Open, 10=Motor Controller - Contacts Open, 11=Motor Controller - Loss Of Current, 12=Power Fault, 13=Control Panel - Schedule, 14=Starter - Low Supply Line Voltage, 15=Starter - High Supply Line Voltage, 16=Proximity Probe - Low Supply Voltage, 17=Oil - Variable Speed Pump - Drive Contacts Open, 57=LCSSS Initialization Failed, 58=LCSSS Shutdown - Requesting Fault Data…, 59=LCSSS - Low Phase A Temperature Sensor, 60=LCSSS - Low Phase B Temperature Sensor, 61=LCSSS - Low Phase C Temperature Sensor, 62=LCSSS - Phase Locked Loop, 63=LCSSS - Power Fault, 64=LCSSS - High Supply Line Voltage, 65=LCSSS - Low Supply Line Voltage, 66=LCSSS - Invalid Current Scale Selection, 67=LCSSS - Run Signal, 68=LCSSS - Serial Communications, 69=LCSSS - Stop Contacts Open, 70=LCSSS - Invalid FLA, 71=LCSSS - Logic Board Processor, 72=LCSSS - DSP Communication Failure, 73=LCSSS - Logic Board Power Supply, 75=LCSSS - Serial Communications, 76=LCSSS - Phase Loss, 78=Motor High Winding Temperature, 82=SSS Shutdown - Requesting Fault Data…"
  },
  {
   "type": "MV",
   "instance": 4,
   "name": "UNIT WARNING FAULT CODE",
   "description": "Unit Warning Fault Code",
   "units": "",
   "access": "R",
   "states": "1=No Warnings Present, 2=Real-Time Clock Failure, 3=Setpoint Override, 4=Condenser Or Evaporator Transducer Error, 5=Evaporator - Low Pressure Limit, 6=Condenser - High Pressure Limit, 7=Condenser Transducer Error, 8=Freeze Threat From Operating Chiller, 9=Refrigerant Level Out Of Range, 10=Standby Lube - Low Oil Pressure, 11=Purge - High Pressure, 12=Purge - Float Switch Error, 13=Purge - Excess Purge, 14=Oil - High Temperature, 15=Oil - Low Pressure Limit, 16=Vanes Uncalibrated, 17=Vanes Uncalibrated - Fixed Speed, 21=Oil - Dirty Filter, 22=Discharge - High Pressure Limit, 24=Low Discharge Superheat Limit, 25=Low Discharge Superheat Detected, 26=Seal Lubrication In Process, 27=External I/O - Serial Communications, 28=Slide Valve Uncalibrated, 29=Freeze Threat - Condenser Flow Switch, 30=Surge Protection - Excess Surge Limit, 31=Excess Surge Detected, 32=Purge - Canister #1 Full, 33=Oil Recovery Limit"
  },
  {
   "type": "MV",
   "instance": 5,
   "name": "UNIT CONTROL SOURCE",
   "description": "Unit Control Source",
   "units": "",
   "access": "R",
   "states": "0=Local, 1=ISN, 2=Analog, 3=Digital, 4=Modem"
  },
  {
   "type": "AV",
   "instance": 32,
   "name": "LVNG CHW TEMP ACT SP",
   "description": "Leaving Chilled Liquid Temperature SP Active",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 35,
   "name": "ANTI RECYCLE TIME REMAIN",
   "description": "Anti-Recycle Time Remaining",
   "units": "Min",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 37,
   "name": "SEAL PRESS DIFFERENTIAL",
   "description": "Seal Pressure Differential",
   "units": "PSID",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 38,
   "name": "FILTER DIFF PRESSURE",
   "description": "Filter Pressure Differential",
   "units": "PSID",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 39,
   "name": "LEAV COND HW TEMP ACT SP",
   "description": "Leaving Heated Liquid Setpoint - Active",
   "units": "°F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 41,
   "name": "MIN LOAD CTL MTR FLA LIM",
   "description": "Minimum Load Control Motor FLA Limit",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 42,
   "name": "SLIDE VALVE POSITION",
   "description": "Slide Valve Position",
   "units": "%",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 49,
   "name": "INPUT POWER",
   "description": "Input Power (SSS only)",
   "units": "kW",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 50,
   "name": "INPUT KWH",
   "description": "Input Kilowatt Hours (SSS only)",
   "units": "kWh",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 51,
   "name": "INPUT KWH LO SSS",
   "description": "Input kWh low part (SSS only)",
   "units": "",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 52,
   "name": "INPUT KWH OFFSET SSS",
   "description": "Input kWh offset part (SSS only)",
   "units": "",
   "access": "R",
   "states": ""
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/york/ys-yn-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"
}